diff --git a/.gitignore b/.gitignore
index 3c46de8..3fd0032 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,4 +1,7 @@
 node_modules
 emu
+.vscode
 *_Output.txt
-src/GTETestApp
\ No newline at end of file
+src/GTETestApp
+*.2mg
+Tool160.SHK
\ No newline at end of file
diff --git a/README.md b/README.md
index 96f0717..00b4dfa 100644
--- a/README.md
+++ b/README.md
@@ -210,4 +210,5 @@ GTE provides the following capabilities
 * [Adaptive Tile Refresh](https://en.wikipedia.org/wiki/Adaptive_tile_refresh)
 * [A Guide to the Graphics of the Sega Mega Drive / Genesis](https://rasterscroll.com/mdgraphics/)
 * [Jon Burton / Traveller's Tales / Coding Secrets](https://ttjontt.wixsite.com/gamehut/coding-secrets)
-* [Lou's Pseudo 3d Page](http://www.extentofthejam.com/pseudo/)
\ No newline at end of file
+* [Lou's Pseudo 3d Page](http://www.extentofthejam.com/pseudo/)
+* [A Great Old-Timey Game-Programming Hack](https://blog.moertel.com/posts/2013-12-14-great-old-timey-game-programming-hack.html)
diff --git a/_FileInformation.txt b/_FileInformation.txt
new file mode 100644
index 0000000..74bd862
--- /dev/null
+++ b/_FileInformation.txt
@@ -0,0 +1,2 @@
+GTETool.SHK=Type(E0),AuxType(8002),VersionCreate(00),MinVersion(87),Access(E3),FolderInfo1(000000000000000000000000000000000000),FolderInfo2(000000000000000000000000000000000000)
+Tool160.SHK=Type(E0),AuxType(8002),VersionCreate(00),MinVersion(B8),Access(E3),FolderInfo1(000000000000000000000000000000000000),FolderInfo2(000000000000000000000000000000000000)
diff --git a/build-image.bat b/build-image.bat
new file mode 100644
index 0000000..343d3fb
--- /dev/null
+++ b/build-image.bat
@@ -0,0 +1,18 @@
+echo off
+
+REM Copy all of the assets into the ProDOS image for emulator testing
+REM
+REM Pass the path of the Cadius tool as the first argument (%1)
+
+set CADIUS="%1"
+set IMAGE=".\\emu\\Target.2mg"
+set FOLDER="/GTEDEV/Toolbox"
+
+REM Cadius does not overwrite files, so clear the root folder first
+%CADIUS% DELETEFOLDER %IMAGE% %FOLDER%
+%CADIUS% CREATEFOLDER %IMAGE% %FOLDER%
+
+REM Now copy files and folders as needed
+%CADIUS% ADDFILE %IMAGE% %FOLDER% .\src\GTETool
+
+REM Copy in the image assets
diff --git a/demos/fatdog-rpg/assets/fatdog-rpg.tiled-session b/demos/fatdog-rpg/assets/fatdog-rpg.tiled-session
index 67101b1..e84888f 100644
--- a/demos/fatdog-rpg/assets/fatdog-rpg.tiled-session
+++ b/demos/fatdog-rpg/assets/fatdog-rpg.tiled-session
@@ -3,10 +3,24 @@
         "height": 4300,
         "width": 2
     },
-    "activeFile": "",
+    "activeFile": "world-map.tmx",
     "expandedProjectPaths": [
+        "."
     ],
+    "file.lastUsedOpenFilter": "All Files (*)",
     "fileStates": {
+        "world-map.tmx": {
+            "scale": 4,
+            "selectedLayer": 1,
+            "viewCenter": {
+                "x": 143.375,
+                "y": 120.75
+            }
+        },
+        "world-tiles.tsx": {
+            "scaleInDock": 4,
+            "scaleInEditor": 1
+        }
     },
     "last.imagePath": "C:/checkout/iigs-game-engine/demos/fatdog-rpg/assets",
     "map.height": 128,
@@ -15,9 +29,13 @@
     "map.tileWidth": 8,
     "map.width": 128,
     "openFiles": [
+        "world-map.tmx",
+        "world-tiles.tsx"
     ],
     "project": "fatdog-rpg.tiled-project",
     "recentFiles": [
+        "world-tiles.tsx",
+        "world-map.tmx"
     ],
     "tileset.lastUsedFormat": "tsx",
     "tileset.tileSize": {
diff --git a/demos/fatdog-rpg/assets/world-map.tmx b/demos/fatdog-rpg/assets/world-map.tmx
index 351e306..d6b7420 100644
--- a/demos/fatdog-rpg/assets/world-map.tmx
+++ b/demos/fatdog-rpg/assets/world-map.tmx
@@ -1,7 +1,7 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <map version="1.5" tiledversion="1.7.2" orientation="orthogonal" renderorder="right-down" width="128" height="128" tilewidth="8" tileheight="8" infinite="0" nextlayerid="3" nextobjectid="1">
  <tileset firstgid="1" source="world-tiles.tsx"/>
- <layer id="1" name="Base Layer" width="128" height="128" locked="1">
+ <layer id="1" name="Base Layer" width="128" height="128" visible="0" locked="1">
   <data encoding="csv">
 1,1,3,3,3,3,3,3,3,3,3,3,3,3,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
 1,1,1,3,3,3,3,3,3,3,3,3,3,3,3,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
diff --git a/demos/fatdog/.gitignore b/demos/fatdog/.gitignore
new file mode 100644
index 0000000..bf24d3e
--- /dev/null
+++ b/demos/fatdog/.gitignore
@@ -0,0 +1 @@
+GTEShooter
\ No newline at end of file
diff --git a/demos/pacman/_FileInformation.txt b/demos/pacman/_FileInformation.txt
new file mode 100644
index 0000000..c37c6cc
--- /dev/null
+++ b/demos/pacman/_FileInformation.txt
@@ -0,0 +1 @@
+GTEPacMan=Type(B3),AuxType(0000),VersionCreate(70),MinVersion(BE),Access(E3),FolderInfo1(000000000000000000000000000000000000),FolderInfo2(000000000000000000000000000000000000)
\ No newline at end of file
diff --git a/demos/shell/.gitignore b/demos/shell/.gitignore
new file mode 100644
index 0000000..56bf228
--- /dev/null
+++ b/demos/shell/.gitignore
@@ -0,0 +1 @@
+GTETestApp
\ No newline at end of file
diff --git a/demos/shell/App.Main.s b/demos/shell/App.Main.s
index ee941cb..5c2c196 100644
--- a/demos/shell/App.Main.s
+++ b/demos/shell/App.Main.s
@@ -9,11 +9,14 @@
                     use        Tool222.Macs.s
                     use        Util.Macs.s
                     use        CORE.MACS.s
-                    use        ../../src/GTE.s
+                    use         GTE.Macs
+
                     use        ../../src/Defs.s
 
                     mx         %00
 
+TSet                EXT
+
 ; Feature flags
 NO_INTERRUPTS       equ        0                       ; turn off for crossrunner debugging
 NO_MUSIC            equ        1                       ; turn music + tool loading off
@@ -22,40 +25,39 @@ NO_MUSIC            equ        1                       ; turn music + tool loadi
                     phk
                     plb
 
-                    jsl        EngineStartUp
+                    sta   MyUserId                ; GS/OS passes the memory manager user ID for the application into the program
+                    _MTStartUp                    ; GTE requires the miscellaneous toolset to be running
 
-                    lda        #^MyPalette
-                    ldx        #MyPalette
-                    ldy        #0
-                    jsl        SetPalette
+                    jsr   GTEStartUp              ; Load and install the GTE User Tool
 
-                    ldx        #0
-                    jsl        SetScreenMode
+; Load a tileset
+
+                pea   #^TSet
+                pea   #TSet
+                _GTELoadTileSet
+
+
+                pea   $0000
+                pea   #^MyPalette
+                pea   #MyPalette
+                _GTESetPalette
+
+                pea   $0000
+                _GTESetScreenMode
 
 ; Set up our level data
-                    jsr        BG0SetUp
-                    jsr        BG1SetUp
-                    jsr        TileAnimInit
+                jsr        BG0SetUp
+                jsr        BG1SetUp
+                jsr        TileAnimInit
 
 ; Allocate room to load data
 
-                    jsl        AllocBank               ; Alloc 64KB for Load/Unpack
-                    sta        BankLoad                ; Store "Bank Pointer"
+                jsl        AllocBank               ; Alloc 64KB for Load/Unpack
+                sta        BankLoad                ; Store "Bank Pointer"
 
-                    jsr        MovePlayerToOrigin      ; Put the player at the beginning of the map
-                    
-                    jsr        InitOverlay             ; Initialize the status bar
+                jsr        MovePlayerToOrigin      ; Put the player at the beginning of the map
+                jsr        InitOverlay             ; Initialize the status bar
 
-                    lda        #DIRTY_BIT_BG0_REFRESH  ; Redraw all of the tiles on the next Render
-                    ora        #DIRTY_BIT_BG1_REFRESH
-                    tsb        DirtyBits
-
-                    stz        frameCount
-                    ldal       OneSecondCounter
-                    sta        oldOneSecondCounter
-
-                    lda        #$FFFF
-                    jsl        Render
 EvtLoop
                     jsl        DoTimers
                     jsl        Render
@@ -439,6 +441,59 @@ closeRec            dw         1                       ; pCount
 qtRec               adrl       $0000
                     da         $00
 
+
+; Load the GTE User Tool and install it
+GTEStartUp
+                pea   $0000
+                _LoaderStatus
+                pla
+
+                pea   $0000
+                pea   $0000
+                pea   $0000
+                pea   $0000
+                pea   $0000                   ; result space
+
+                lda   MyUserId
+                pha
+
+                pea   #^ToolPath
+                pea   #ToolPath
+                pea   $0001                   ; do not load into special memory
+                _InitialLoad
+                bcc    :ok1
+                brk    $01
+
+:ok1
+                ply
+                pla                           ; Address of the loaded tool
+                plx
+                ply
+                ply
+
+                pea   $8000                   ; User toolset
+                pea   $00A0                   ; Set the tool set number
+                phx
+                pha                           ; Address of function pointer table
+                _SetTSPtr
+                bcc    :ok2
+                brk    $02
+
+:ok2
+                clc                             ; Give GTE a page of direct page memory
+                tdc
+                adc   #$0100
+                pha
+                pea   #ENGINE_MODE_DYN_TILES+ENGINE_MODE_TWO_LAYER   ; Enable Dynamic Tiles and Two Layer
+                lda   MyUserId                  ; Pass the userId for memory allocation
+                pha
+                _GTEStartUp
+                bcc    :ok3
+                brk    $03
+
+:ok3
+                rts
+
                     PUT        App.Msg.s
                     PUT        Actions.s
                     PUT        font.s
diff --git a/demos/shell/App.s b/demos/shell/App.s
index 419314c..aba9045 100644
--- a/demos/shell/App.s
+++ b/demos/shell/App.s
@@ -7,30 +7,9 @@
 ; Segment #1 -- Main execution block
 
             ASM   App.Main.s
-            DS    0                    ;   Number of bytes of 0's to add at the end of the Segment
-            KND   #$1100               ;   Type and Attributes ($11=Static+Bank Relative,$00=Code)
-            ALI   None                 ;   Boundary Alignment (None)
             SNA   Main
 
-; Segment #2 -- Core GTE Code
-
-            ASM   ..\..\src\Core.s
-            SNA   Core
-
-; Segment #3 -- 64KB Tile Memory
+; Segment #2 -- Tileset
 
             ASM   gen\App.TileSet.s
-            DS    0
-            KND   #$1001               ; Type and Attributes ($11=Static+Bank Relative,$01=Data)
-;            ALI   BANK
-            SNA   Tiles
-
-; Segment #4 -- Rotation table data
-
-            ASM   ..\..\src\RotData.s
-            DS    0
-            KND   #$1001               ; Type and Attributes ($11=Static+Bank Relative,$01=Data)
-            ALI   BANK
-            SNA   RotData
-
-
+            SNA   TSET
\ No newline at end of file
diff --git a/demos/shell/Overlay.s b/demos/shell/Overlay.s
index e0a7b7d..ee3fb46 100644
--- a/demos/shell/Overlay.s
+++ b/demos/shell/Overlay.s
@@ -10,7 +10,27 @@
 ; There are two subroutines that need to be implemented -- one to update the overlay content and a 
 ; second to actually render to the screen
 
-; Initialize the overlay be drawin gin static content that will not change over time
+STATE_REG       equ   $E0C068
+
+_R0W0           mac                   ; Read Bank 0 / Write Bank 0
+                ldal  STATE_REG
+                and   #$FFCF
+                stal  STATE_REG
+                <<<
+
+_R0W1           mac                   ; Read Bank 0 / Write Bank 1
+                ldal  STATE_REG
+                ora   #$0010
+                stal  STATE_REG
+                <<<
+
+_R1W1           mac                   ; Read Bank 0 / Write Bank 1
+                ldal  STATE_REG
+                ora   #$0030
+                stal  STATE_REG
+                <<<
+
+; Initialize the overlay be drawing in static content that will not change over time
 
 CHAR_TILE_BASE equ 193     ; set this to the real tile id that starts an ASCII run starting at '0' through 'Z'
 
@@ -32,35 +52,57 @@ l_mask      equ   ovrly_mask
 
 MASK_OFFSET equ   {ovrly_mask-ovrly_buff}
 
+TileDataPtr equ   $FC
+TileMaskPtr equ   $F8
+
 InitOverlay
+
+             pha
+             pha
+             _GTEGetTileDataAddr
+             pla
+             sta    TileDataPtr
+             clc
+             adc    #32
+             sta    TileMaskPtr
+             pla
+             sta    TileDataPtr+2
+             sta    TileMaskPtr+2
+
              lda    #'F'
-             ldy    #l_line+{CHAR_WIDTH*0}
+             ldx    #l_line+{CHAR_WIDTH*0}
              jsr    _DrawChar
              lda    #'P'
-             ldy    #l_line+{CHAR_WIDTH*1}
+             ldx    #l_line+{CHAR_WIDTH*1}
              jsr    _DrawChar
              lda    #'S'
-             ldy    #l_line+{CHAR_WIDTH*2}
+             ldx    #l_line+{CHAR_WIDTH*2}
              jsr    _DrawChar
              lda    #':'
-             ldy    #l_line+{CHAR_WIDTH*3}
+             ldx    #l_line+{CHAR_WIDTH*3}
              jsr    _DrawChar
 
              lda    #'T'
-             ldy    #r_line+{CHAR_WIDTH*0}
+             ldx    #r_line+{CHAR_WIDTH*0}
              jsr    _DrawChar
              lda    #'I'
-             ldy    #r_line+{CHAR_WIDTH*1}
+             ldx    #r_line+{CHAR_WIDTH*1}
              jsr    _DrawChar
              lda    #'C'
-             ldy    #r_line+{CHAR_WIDTH*2}
+             ldx    #r_line+{CHAR_WIDTH*2}
              jsr    _DrawChar
              lda    #'K'
-             ldy    #r_line+{CHAR_WIDTH*3}
+             ldx    #r_line+{CHAR_WIDTH*3}
              jsr    _DrawChar
              lda    #':'
-             ldy    #r_line+{CHAR_WIDTH*4}
+             ldx    #r_line+{CHAR_WIDTH*4}
              jsr    _DrawChar
+
+             pea    $0000
+             pea    $0008
+             pea    #^StatusBar
+             pea    #StatusBar
+             _GTESetOverlay
              rts
 
 ; Update the dynamic content of the overlay
@@ -79,8 +121,8 @@ UdtOverlay
              lda   frameCount                       ; render the FPS value
              xba
              jsr   _num2ascii
-             ldy   #l_line+{CHAR_WIDTH*4}
-             jsr    _DrawChar
+             ldx   #l_line+{CHAR_WIDTH*4}
+             jsr   _DrawChar
 
              lda   frameCount
              lsr
@@ -88,44 +130,52 @@ UdtOverlay
              lsr
              lsr
              jsr   _num2ascii
-             ldy   #l_line+{CHAR_WIDTH*5}
+             ldx   #l_line+{CHAR_WIDTH*5}
              jsr    _DrawChar
 
              lda   frameCount
              jsr   _num2ascii
-             ldy   #l_line+{CHAR_WIDTH*6}
+             ldx   #l_line+{CHAR_WIDTH*6}
              jsr    _DrawChar
 
-             ldal  OneSecondCounter                   ; reder the number of remaining seconds
+             pha
+             _GTEGetSeconds
+             pla
+             sta   oneSecondCounter                   ; render the number of remaining seconds
              xba
              jsr   _num2ascii
-             ldy   #r_line+{CHAR_WIDTH*5}
+             ldx   #r_line+{CHAR_WIDTH*5}
              jsr    _DrawChar
 
-             ldal  OneSecondCounter
+             lda   oneSecondCounter
              lsr
              lsr
              lsr
              lsr
              jsr   _num2ascii
-             ldy   #r_line+{CHAR_WIDTH*6}
+             ldx   #r_line+{CHAR_WIDTH*6}
              jsr    _DrawChar
 
-             ldal  OneSecondCounter
+             lda   oneSecondCounter
              jsr   _num2ascii
-             ldy   #r_line+{CHAR_WIDTH*7}
-             jsr    _DrawChar
+             ldx   #r_line+{CHAR_WIDTH*7}
+             jsr   _DrawChar
 
              rts
 
+oneSecondCounter ds 2
+
 ; Draw the overlay
 ;  A = address of the left edge of the screen
-Overlay      ENT
-             phb                                     ; Called via JSL
+StatusBar    phb                                     ; Called via JSL
+             phd                                     ; save the direct page register
+
              phk
              plb
 
-             phd                                     ; save the direct page register
+             ldx   MyDirectPage                      ; Preserve the accumulator
+             phx
+             pld
 
              sta   l_addr                            ; save this value (will go into D-reg later)
              clc
@@ -144,12 +194,12 @@ Overlay      ENT
              sec
              sbc   m_addr                            ; calculate the number of words between the two ends
              and   #$FFFE
-             pha
-             lda   #m_end
-             sec
-             sbc   1,s
+
+             eor   #$FFFF
+             inc
+             clc
+             adc   #m_end
              sta   m_patch+1
-             pla
 
              sei
              _R1W1
@@ -192,7 +242,7 @@ l_ovrly_rtn
              _R0W0
              cli
 
-:exit
+o_exit
              pld                                     ; restore the direct page and bank and return
              plb
              rtl
@@ -201,7 +251,6 @@ l_addr       ds    2
 m_addr       ds    2
 r_addr       ds    2
 
-
 r_ovrly
 ]idx        equ   0
             lup   R_CHAR_COUNT
@@ -247,10 +296,7 @@ m_end
 ;
 ; A = Tile ID
 ; Y = overlay address location
-tiledata     EXT
-
 _DCOut      rts
-
 _DrawChar
             cmp             #'0'
             bcc             _DCOut
@@ -261,19 +307,122 @@ _DrawChar
             sbc             #'0'
             clc
             adc             #CHAR_TILE_BASE
-            jsl             GetTileAddr
-            tax
+            jsr             _GetTileAddr
+            tay
 
-]idx        equ             0
-            lup             8
-            ldal            tiledata+32+{]idx*4},x
-            sta:            {]idx*OVRLY_SPAN}+MASK_OFFSET,y
-            ldal            tiledata+{]idx*4},x
-            sta:            {]idx*OVRLY_SPAN},y
-            ldal            tiledata+32+{]idx*4}+2,x
-            sta:            {]idx*OVRLY_SPAN}+MASK_OFFSET+2,y
-            ldal            tiledata+{]idx*4}+2,x
-            sta:            {]idx*OVRLY_SPAN}+2,y
-]idx        equ             ]idx+1
-            --^
+            lda             [TileMaskPtr],y
+            sta:            {0*OVRLY_SPAN}+MASK_OFFSET,x
+            lda             [TileDataPtr],y
+            sta:            {0*OVRLY_SPAN},x
+            iny
+            iny
+            lda             [TileMaskPtr],y
+            sta:            {0*OVRLY_SPAN}+MASK_OFFSET+2,x
+            lda             [TileDataPtr],y
+            sta:            {0*OVRLY_SPAN}+2,x
+            iny
+            iny
+
+            lda             [TileMaskPtr],y
+            sta:            {1*OVRLY_SPAN}+MASK_OFFSET,x
+            lda             [TileDataPtr],y
+            sta:            {1*OVRLY_SPAN},x
+            iny
+            iny
+            lda             [TileMaskPtr],y
+            sta:            {1*OVRLY_SPAN}+MASK_OFFSET+2,x
+            lda             [TileDataPtr],y
+            sta:            {1*OVRLY_SPAN}+2,x
+            iny
+            iny
+
+            lda             [TileMaskPtr],y
+            sta:            {2*OVRLY_SPAN}+MASK_OFFSET,x
+            lda             [TileDataPtr],y
+            sta:            {2*OVRLY_SPAN},x
+            iny
+            iny
+            lda             [TileMaskPtr],y
+            sta:            {2*OVRLY_SPAN}+MASK_OFFSET+2,x
+            lda             [TileDataPtr],y
+            sta:            {2*OVRLY_SPAN}+2,x
+            iny
+            iny
+
+            lda             [TileMaskPtr],y
+            sta:            {3*OVRLY_SPAN}+MASK_OFFSET,x
+            lda             [TileDataPtr],y
+            sta:            {3*OVRLY_SPAN},x
+            iny
+            iny
+            lda             [TileMaskPtr],y
+            sta:            {3*OVRLY_SPAN}+MASK_OFFSET+2,x
+            lda             [TileDataPtr],y
+            sta:            {3*OVRLY_SPAN}+2,x
+            iny
+            iny
+
+            lda             [TileMaskPtr],y
+            sta:            {4*OVRLY_SPAN}+MASK_OFFSET,x
+            lda             [TileDataPtr],y
+            sta:            {4*OVRLY_SPAN},x
+            iny
+            iny
+            lda             [TileMaskPtr],y
+            sta:            {4*OVRLY_SPAN}+MASK_OFFSET+2,x
+            lda             [TileDataPtr],y
+            sta:            {4*OVRLY_SPAN}+2,x
+            iny
+            iny
+
+            lda             [TileMaskPtr],y
+            sta:            {5*OVRLY_SPAN}+MASK_OFFSET,x
+            lda             [TileDataPtr],y
+            sta:            {5*OVRLY_SPAN},x
+            iny
+            iny
+            lda             [TileMaskPtr],y
+            sta:            {5*OVRLY_SPAN}+MASK_OFFSET+2,x
+            lda             [TileDataPtr],y
+            sta:            {5*OVRLY_SPAN}+2,x
+            iny
+            iny
+
+            lda             [TileMaskPtr],y
+            sta:            {6*OVRLY_SPAN}+MASK_OFFSET,x
+            lda             [TileDataPtr],y
+            sta:            {6*OVRLY_SPAN},x
+            iny
+            iny
+            lda             [TileMaskPtr],y
+            sta:            {6*OVRLY_SPAN}+MASK_OFFSET+2,x
+            lda             [TileDataPtr],y
+            sta:            {6*OVRLY_SPAN}+2,x
+            iny
+            iny
+
+            lda             [TileMaskPtr],y
+            sta:            {7*OVRLY_SPAN}+MASK_OFFSET,x
+            lda             [TileDataPtr],y
+            sta:            {7*OVRLY_SPAN},x
+            iny
+            iny
+            lda             [TileMaskPtr],y
+            sta:            {7*OVRLY_SPAN}+MASK_OFFSET+2,x
+            lda             [TileDataPtr],y
+            sta:            {7*OVRLY_SPAN}+2,x
+
+            rts
+
+_GetTileAddr
+            asl                                               ; Multiply by 2
+            bit   #2*TILE_HFLIP_BIT                           ; Check if the horizontal flip bit is set
+            beq   :no_flip
+            inc                                               ; Set the LSB
+:no_flip    asl                                               ; x4
+            asl                                               ; x8
+            asl                                               ; x16
+            asl                                               ; x32
+            asl                                               ; x64
+            asl                                               ; x128
             rts
\ No newline at end of file
diff --git a/demos/shell/assets/assets.tiled-session b/demos/shell/assets/assets.tiled-session
index d7755b1..869dee2 100644
--- a/demos/shell/assets/assets.tiled-session
+++ b/demos/shell/assets/assets.tiled-session
@@ -3,7 +3,7 @@
         "height": 4300,
         "width": 2
     },
-    "activeFile": "tiled/world_1-1.tmx",
+    "activeFile": "C:/checkout/iigs-game-engine/demos/zelda/assets/overworld.tmx",
     "expandedProjectPaths": [
         "tiled"
     ],
@@ -26,46 +26,145 @@
             "scaleInDock": 2,
             "scaleInEditor": 4
         },
+        "C:/checkout/iigs-game-engine/demos/sprites/assets/tiled/Overworld.tsx": {
+            "scaleInDock": 2,
+            "scaleInEditor": 4
+        },
+        "C:/checkout/iigs-game-engine/demos/sprites/assets/tiled/world_1-1.tmx": {
+            "scale": 2,
+            "selectedLayer": 0,
+            "viewCenter": {
+                "x": 412,
+                "y": 309
+            }
+        },
+        "C:/checkout/iigs-game-engine/demos/zelda/assets/Zelda.tsx": {
+            "scaleInDock": 4,
+            "scaleInEditor": 1
+        },
+        "C:/checkout/iigs-game-engine/demos/zelda/assets/overworld.tmx": {
+            "scale": 2,
+            "selectedLayer": 0,
+            "viewCenter": {
+                "x": 222.75,
+                "y": 192.5
+            }
+        },
+        "C:/checkout/tiled/examples/desert.tmx": {
+            "scale": 0.5462499999999999,
+            "selectedLayer": 0,
+            "viewCenter": {
+                "x": 716.704805491991,
+                "y": 793.5926773455379
+            }
+        },
+        "C:/checkout/tiled/examples/desert.tsx": {
+            "scaleInDock": 1
+        },
+        "C:/checkout/tiled/examples/hexagonal-mini.tmx": {
+            "scale": 3.0067010309278346,
+            "selectedLayer": 0,
+            "viewCenter": {
+                "x": 159.14452254414542,
+                "y": 116.90553745928342
+            }
+        },
+        "C:/checkout/tiled/examples/hexagonal-mini.tmx#hex mini": {
+            "scaleInDock": 1
+        },
+        "C:/checkout/tiled/examples/isometric_grass_and_water.tmx": {
+            "scale": 0.4643125,
+            "selectedLayer": 0,
+            "viewCenter": {
+                "x": 1039.1708170682462,
+                "y": 573.9668865257775
+            }
+        },
+        "C:/checkout/tiled/examples/isometric_grass_and_water.tmx#isometric_grass_and_water": {
+            "scaleInDock": 1
+        },
+        "C:/checkout/tiled/examples/perspective_walls.tmx": {
+            "scale": 0.8369268292682926,
+            "selectedLayer": 0,
+            "viewCenter": {
+                "x": 497.65401876784983,
+                "y": 479.7313050067028
+            }
+        },
+        "C:/checkout/tiled/examples/perspective_walls.tsx": {
+            "scaleInDock": 1
+        },
+        "C:/checkout/tiled/examples/rpg/beach_tileset.tsx": {
+            "scaleInDock": 1
+        },
+        "C:/checkout/tiled/examples/rpg/island.tmx": {
+            "scale": 1.0267780172413792,
+            "selectedLayer": 0,
+            "viewCenter": {
+                "x": 464.0730440258173,
+                "y": 376.42021304507534
+            }
+        },
+        "C:/checkout/tiled/examples/sewers.tmx": {
+            "scale": 0.7148749999999999,
+            "selectedLayer": 0,
+            "viewCenter": {
+                "x": 600.8043364224515,
+                "y": 600.8043364224516
+            }
+        },
+        "C:/checkout/tiled/examples/sewers.tmx#sewer_tileset": {
+            "scaleInDock": 1
+        },
         "tiled/Overworld.tsx": {
             "scaleInDock": 2,
-            "scaleInEditor": 1
+            "scaleInEditor": 8
         },
         "tiled/world_1-1.tmx": {
             "scale": 2,
             "selectedLayer": 1,
             "viewCenter": {
-                "x": 210.5,
-                "y": 107.75
+                "x": 212.75,
+                "y": 211.25
             }
         }
     },
-    "last.exportedFilePath": "C:/checkout/iigs-game-engine/assets/tiled",
-    "last.imagePath": "C:/checkout/iigs-game-engine/assets/tilesets",
-    "map.height": 30,
+    "frame.defaultDuration": 256,
+    "last.exportedFilePath": "C:/checkout/iigs-game-engine/demos/zelda/assets",
+    "last.imagePath": "C:/checkout/iigs-game-engine/demos/zelda/assets",
+    "map.height": 44,
     "map.lastUsedExportFilter": "JSON map files (*.json)",
     "map.lastUsedFormat": "tmx",
     "map.renderOrder": null,
     "map.tileHeight": 8,
     "map.tileWidth": 8,
-    "map.width": 256,
+    "map.width": 64,
     "openFiles": [
-        "tiled/world_1-1.tmx",
-        "tiled/Overworld.tsx"
+        "C:/checkout/iigs-game-engine/demos/zelda/assets/overworld.tmx",
+        "C:/checkout/iigs-game-engine/demos/zelda/assets/Zelda.tsx"
     ],
     "project": "assets.tiled-project",
-    "property.type": "int",
+    "property.type": "bool",
     "recentFiles": [
-        "tiled/Overworld.tsx",
+        "C:/checkout/iigs-game-engine/demos/zelda/assets/Zelda.tsx",
+        "C:/checkout/iigs-game-engine/demos/zelda/assets/overworld.tmx",
+        "C:/checkout/iigs-game-engine/demos/sprites/assets/tiled/Overworld.tsx",
+        "C:/checkout/iigs-game-engine/demos/sprites/assets/tiled/world_1-1.tmx",
         "tiled/world_1-1.tmx",
-        "C:/Users/lscharen/SNES - Final Fantasy 6 - South Figaro Exterior.tsx",
-        "C:/Users/lscharen/Overworld.tmx",
-        "C:/Users/lscharen/EUm-lfFWkAEb5fJ.tsx"
+        "tiled/Overworld.tsx",
+        "C:/checkout/tiled/examples/desert.tmx",
+        "C:/checkout/tiled/examples/hexagonal-mini.tmx",
+        "C:/checkout/tiled/examples/isometric_grass_and_water.tmx",
+        "C:/checkout/tiled/examples/perspective_walls.tmx",
+        "C:/checkout/tiled/examples/sewers.tmx",
+        "C:/checkout/tiled/examples/rpg/island.tmx"
     ],
+    "resizeMap.removeObjects": true,
     "tileset.lastUsedFormat": "tsx",
     "tileset.tileSize": {
         "height": 8,
         "width": 8
     },
-    "tileset.transparentColor": "#6b8cff",
-    "tileset.useTransparentColor": false
+    "tileset.transparentColor": "#ff00ff",
+    "tileset.useTransparentColor": true
 }
diff --git a/demos/shell/assets/fatdog-1.png b/demos/shell/assets/fatdog-1.png
index 79398d7..598e30d 100644
Binary files a/demos/shell/assets/fatdog-1.png and b/demos/shell/assets/fatdog-1.png differ
diff --git a/demos/shell/assets/fatdog-2.png b/demos/shell/assets/fatdog-2.png
index 59ffaeb..6025a66 100644
Binary files a/demos/shell/assets/fatdog-2.png and b/demos/shell/assets/fatdog-2.png differ
diff --git a/demos/shell/gen/App.TileSet.s b/demos/shell/gen/App.TileSet.s
index e6c1692..98af67d 100644
--- a/demos/shell/gen/App.TileSet.s
+++ b/demos/shell/gen/App.TileSet.s
@@ -2,7 +2,7 @@
 ; Palette:
 ; $0000,$0777,$0F31,$0E51,$00A0,$02E3,$0BF1,$0FA4,$0FD7,$0EE6,$0F59,$068F,$01CE,$09B9,$0EDA,$0EEE
 ; Converting to BG0 format...
-tiledata    ENT
+TSet        ENT
 
 ; Reserved space (tile 0 is special...
             ds 128
diff --git a/demos/smb/.gitignore b/demos/smb/.gitignore
new file mode 100644
index 0000000..56bf228
--- /dev/null
+++ b/demos/smb/.gitignore
@@ -0,0 +1 @@
+GTETestApp
\ No newline at end of file
diff --git a/demos/smb/_FileInformation.txt b/demos/smb/_FileInformation.txt
new file mode 100644
index 0000000..4fffcad
--- /dev/null
+++ b/demos/smb/_FileInformation.txt
@@ -0,0 +1 @@
+GTETestApp=Type(B3),AuxType(0000),VersionCreate(70),MinVersion(BE),Access(E3),FolderInfo1(000000000000000000000000000000000000),FolderInfo2(000000000000000000000000000000000000)
diff --git a/demos/smb/package.json b/demos/smb/package.json
new file mode 100644
index 0000000..6a20491
--- /dev/null
+++ b/demos/smb/package.json
@@ -0,0 +1,28 @@
+{
+  "name": "super-mario-bros-nes-demo",
+  "version": "1.0.0",
+  "description": "Wrapping the SMB 6502 ROM in GTE",
+  "main": "index.js",
+  "config": {
+    "merlin32": "C:\\Programs\\IIgsXDev\\bin\\Merlin32-1.1.10.exe",
+    "cadius": "C:\\Programs\\IIgsXDev\\bin\\Cadius.exe",
+    "gsport": "C:\\Programs\\gsport\\gsport_0.31\\GSPort.exe",
+    "macros": "C:\\Programs\\BrutalDeluxe\\Merlin32\\Library",
+    "crossrunner": "C:\\Programs\\Crossrunner\\Crossrunner.exe"
+  },
+  "scripts": {
+    "build": "%npm_package_config_merlin32% -V %npm_package_config_macros% App.s"
+  },
+  "repository": {
+    "type": "git",
+    "url": "git+https://github.com/lscharen/iigs-game-engine.git"
+  },
+  "author": "Lucas Scharenbroich",
+  "license": "Apache-2.0",
+  "bugs": {
+    "url": "https://github.com/lscharen/iigs-game-engine/issues"
+  },
+  "homepage": "https://github.com/lscharen/iigs-game-engine#readme",
+  "devDependencies": {
+  }
+}
diff --git a/demos/sprites/App.Main.s b/demos/sprites/App.Main.s
index e92881d..f5d042f 100644
--- a/demos/sprites/App.Main.s
+++ b/demos/sprites/App.Main.s
@@ -1,293 +1,353 @@
 ; Test driver to exercise graphics routines.
 
-                    REL
-                    DSK        MAINSEG
+                REL
+                DSK        MAINSEG
 
-                    use        Locator.Macs.s
-                    use        Misc.Macs.s
-                    use        EDS.GSOS.MACS.s
-                    use        Tool222.Macs.s
-                    use        Util.Macs.s
-                    use        CORE.MACS.s
-                    use        ../../src/GTE.s
-                    use        ../../src/Defs.s
+                use   Locator.Macs
+                use   Load.Macs
+                use   Mem.Macs
+                use   Misc.Macs
+                use   Tool222.Macs.s
+                use   Util.Macs
+                use   EDS.GSOS.Macs
+                use   GTE.Macs
 
-                    mx         %00
+;                use   ../../src/Defs.s
 
-; Feature flags
-NO_INTERRUPTS       equ        0                       ; turn off for crossrunner debugging
-NO_MUSIC            equ        1                       ; turn music + tool loading off
+                mx         %00
+
+TSet            EXT                           ; tileset buffer
 
 ; Keycodes
-LEFT_ARROW          equ        $08
-RIGHT_ARROW         equ        $15
-UP_ARROW            equ        $0B
-DOWN_ARROW          equ        $0A
+LEFT_ARROW      equ        $08
+RIGHT_ARROW     equ        $15
+UP_ARROW        equ        $0B
+DOWN_ARROW      equ        $0A
 
-; Typical init
-                    phk
-                    plb
+; Direct page space
+appTmp0         equ        0
+BankLoad        equ        2
+StartX          equ        4
+StartY          equ        6
+TileMapWidth    equ        8
+TileMapHeight   equ        10
+ScreenWidth     equ        12
+ScreenHeight    equ        14
 
-                    jsl        EngineStartUp
+                phk
+                plb
 
-                    lda        #^MyPalette               ; Fill Palette #0 with our colors
-                    ldx        #MyPalette
-                    ldy        #0
-                    jsl        SetPalette
+                sta   MyUserId                ; GS/OS passes the memory manager user ID for the application into the program
+                tdc
+                sta   MyDirectPage            ; Keep a copy for the overlay callback
 
-                    ldx        #5                        ; Mode 0 is full-screen, mode 5 is 256x160
-                    ldx        #320
-                    ldy        #200
-                    jsl        SetScreenMode
+                _MTStartUp                    ; GTE requires the miscellaneous toolset to be running
+
+                jsr   GTEStartUp              ; Load and install the GTE User Tool
+
+; Initialize local variables
+
+                stz   appTmp0
+                stz   BankLoad
+                stz   StartX
+                stz   StartY
+
+; Initialize the graphics screen to a 256x160 playfield
+
+                pea   #320
+                pea   #200
+                _GTESetScreenMode
+
+; Load a tileset
+
+                pea   #^TSet
+                pea   #TSet
+                _GTELoadTileSet
+
+                pea   $0000
+                pea   #^MyPalette
+                pea   #MyPalette
+                _GTESetPalette
 
 ; Set up our level data
-                    jsr        BG0SetUp
-                    jsr        TileAnimInit
-                    jsr        SetLimits
+                jsr        BG0SetUp
+                jsr        TileAnimInit
+                jsr        SetLimits
 
-                    jsr        InitOverlay             ; Initialize the status bar
-                    stz        frameCount
-                    ldal       OneSecondCounter
-                    sta        oldOneSecondCounter
-                    jsr        UdtOverlay
+                jsr        InitOverlay             ; Initialize the status bar
+                stz        frameCount
+                pha
+                _GTEGetSeconds
+                pla
+                sta        oldOneSecondCounter
+                jsr        UdtOverlay
 
 ; Allocate a buffer for loading files
-                    jsl        AllocBank               ; Alloc 64KB for Load/Unpack
-                    sta        BankLoad                ; Store "Bank Pointer"
+                jsl        AllocBank               ; Alloc 64KB for Load/Unpack
+                sta        BankLoad                ; Store "Bank Pointer"
 
 ; Load in the 256 color background into BG1 buffer
-                    brl        :nobackground
+;                brl        :nobackground
 DoLoadBG1
-                    lda        BankLoad
-                    ldx        #BG1DataFile
-                    jsr        LoadFile
+                lda        BankLoad
+                ldx        #BG1DataFile
+                jsr        LoadFile
 
-                    ldx        BankLoad
-                    lda        #0
-                    ldy        BG1DataBank
-                    jsl        CopyPicToBG1
+                lda        BankLoad
+                pha
+                pea        $0000
+                _GTECopyPicToBG1
 
 ; Copy the palettes into place
 
-                    stz        tmp0
+                stz        appTmp0
 :ploop
-                    lda        tmp0
-                    tay
-                    asl
-                    asl
-                    asl
-                    asl
-                    asl
-                    clc
-                    adc        #$7E00
-                    tax
+                lda        appTmp0
+                pha                        ; Palette number
+                ldy        BankLoad
+                phy                        ; High word pointer to palette
 
-                    lda        BankLoad
-                    jsl        SetPalette
+                asl
+                asl
+                asl
+                asl
+                asl
+                clc
+                adc        #$7E00
+                pha                        ; Low word pointer to palette
+                _GTESetPalette
 
-                    inc        tmp0
-                    lda        tmp0
-                    cmp        #16
-                    bcc        :ploop
+                inc        appTmp0
+                lda        appTmp0
+                cmp        #16
+                bcc        :ploop
 
 ; Bind the SCBs
 
-                    lda        BankLoad
-                    ora        #$8000                     ; set high bit to bind to BG1 Y-position
-                    ldx        #$7D00
-                    jsl        SetSCBArray
+                lda        BankLoad
+                ora        #$8000                     ; set high bit to bind to BG1 Y-position
+                pha
+                pea        $7D00
+                _GTEBindSCBArray
 :nobackground
 
 ; Initialize the sprite's global position (this is tracked outside of the tile engine)
-                    lda        #16
-                    sta        PlayerGlobalX
-                    lda        MaxGlobalY
-                    sec
-                    lda        #40                     ; 32 for tiles, 8 for sprite
-                    sta        PlayerGlobalY
+                lda        #16
+                sta        PlayerGlobalX
+                lda        MaxGlobalY
+                sec
+                lda        #40                     ; 32 for tiles, 8 for sprite
+                sta        PlayerGlobalY
 
-                    stz        PlayerXVel
-                    stz        PlayerYVel
+                stz        PlayerXVel
+                stz        PlayerYVel
 
-; Add a sprite to the engine and save it's sprite ID
-SPRITE_ID           equ        {SPRITE_16X16+145}
-MUSHROOM_ID         equ        {SPRITE_16X16+255}
+; Create the sprites
+HERO_ID         equ        {SPRITE_16X16+145}
+HERO_VBUFF      equ        VBUFF_SPRITE_START+0*VBUFF_SPRITE_STEP
+HERO_SLOT       equ        1
+MUSHROOM_ID     equ        {SPRITE_16X16+255}
+MUSHROOM_VBUFF  equ        VBUFF_SPRITE_START+1*VBUFF_SPRITE_STEP
+MUSHROOM_SLOT   equ        0
 
-                    lda        #MUSHROOM_ID              ; 16x16 sprite, tile ID = 145
-                    ldx        #80
-                    ldy        #152
-                    jsl        AddSprite
+                pea   HERO_ID                     ; sprint id
+                pea   HERO_VBUFF                  ; vbuff address
+                _GTECreateSpriteStamp
 
-                    jsr        UpdatePlayerLocal
-                    lda        #SPRITE_ID              ; 16x16 sprite, tile ID = 145
-                    ldx        PlayerX
-                    ldy        PlayerY
-                    jsl        AddSprite
-                    bcc        :sprite_ok
-                    brl        Exit                    ; If we could not allocate a sprite, exit
-:sprite_ok
-                    sta        PlayerID
+                pea   MUSHROOM_ID                 ; sprint id
+                pea   MUSHROOM_VBUFF              ; vbuff address
+                _GTECreateSpriteStamp
 
-; Draw the initial screen
+                pea   MUSHROOM_ID                 ; Put the mushroom in Slot 0
+                pea   #80                         ; at x=80, y=152
+                pea   #152
+                pea   MUSHROOM_SLOT
+                _GTEAddSprite
 
-                    lda        #DIRTY_BIT_BG0_REFRESH  ; Redraw all of the tiles on the next Render
-                    tsb        DirtyBits
-                    jsl        Render
+                pea   MUSHROOM_SLOT
+                pea   $0000                       ; with these flags (h/v flip)
+                pea   MUSHROOM_VBUFF             ; and use this stamp
+                _GTEUpdateSprite
+
+                jsr   UpdatePlayerLocal
+
+                pea   HERO_ID
+                lda   PlayerX
+                pha
+                lda   PlayerY
+                pha
+                pea   HERO_SLOT                    ; Put the player in slot 1
+                _GTEAddSprite
+
+                pea   HERO_SLOT
+                pea   $0000
+                pea   HERO_VBUFF                   ; and use this stamp
+                _GTEUpdateSprite
 
 ; Set up a very specific test.  First, we draw a sprite into the sprite plane, and then
 ; leave it alone.  We are just testing the ability to merge sprite plane data into 
 ; the play field tiles.
 EvtLoop
-                    jsl        ReadControl
+                pha
+                _GTEReadControl
 
 ; Check the buttons first
-                    pha
+                lda   1,s
 
-                    bit        #$0100
-                    beq        :no_jump
-                    lda        PlayerStanding
-                    beq        :no_jump
-                    lda        #$FFF8
-                    sta        PlayerYVel
+                bit        #$0100
+                beq        :no_jump
+                lda        PlayerStanding
+                beq        :no_jump
+                lda        #$FFF8
+                sta        PlayerYVel
 :no_jump
 
-
 ; Enable/disable v-sync
-                    lda        1,s
-                    bit        #$0400
-                    beq        :no_key_down
-                    and        #$007F
-                    cmp        #'v'
-                    bne        :not_v
-                    lda        #$0001
-                    eor        vsync
-                    sta        vsync
+                lda        1,s
+                bit        #$0400
+                beq        :no_key_down
+                and        #$007F
+                cmp        #'v'
+                bne        :not_v
+                lda        #$0001
+                eor        vsync
+                sta        vsync
 :not_v
-                    cmp        #'f'
-                    bne        :not_f
-                    lda        SpriteToggle
-                    eor        #SPRITE_HIDE
-                    sta        SpriteToggle
-                    bne        :not_f
-                    stz        SpriteCount
+                cmp        #'f'
+                bne        :not_f
+                lda        SpriteToggle
+                eor        #SPRITE_HIDE
+                sta        SpriteToggle
+                bne        :not_f
+                stz        SpriteCount
 
 :not_f
 :no_key_down
+                pla
+                and        #$007F                  ; Ignore the buttons for now
 
+                cmp        #'q'
+                bne        :not_q
+                brl        Exit
 
-                    pla
-                    and        #$007F                  ; Ignore the buttons for now
-
-                    cmp        #'q'
-                    bne        :not_q
-                    brl        Exit
 :not_q
-
-                    cmp        #'d'
-                    bne        :not_d
-                    lda        StartX
-                    cmp        MaxBG0X
-                    bcs        :do_render
-                    inc
-                    jsl        SetBG0XPos
-                    bra        :do_render
+                cmp        #'d'
+                bne        :not_d
+                lda        StartX
+                cmp        MaxBG0X
+                bcc        *+5
+                brl        :do_render
+                inc        StartX
+                pei        StartX
+                pei        StartY
+                _GTESetBG0Origin
+                brl        :do_render
 :not_d
 
-                    cmp        #'a'
-                    bne        :not_a
-                    lda        StartX
-                    beq        :do_render
-                    dec
-                    jsl        SetBG0XPos
-                    bra        :do_render
+                cmp        #'a'
+                bne        :not_a
+                lda        StartX
+                bne        *+5
+                brl        :do_render
+                dec        StartX
+                pei        StartX
+                pei        StartY
+                _GTESetBG0Origin
+                brl        :do_render
 :not_a
 
-                    cmp        #'s'
-                    bne        :not_s
-                    lda        StartY
-                    cmp        MaxBG0Y
-                    bcs        :do_render
-                    inc
-                    jsl        SetBG0YPos
-                    bra        :do_render
+                cmp        #'s'
+                bne        :not_s
+                lda        StartY
+                cmp        MaxBG0Y
+                bcs        :do_render
+                inc        StartY
+                pei        StartX
+                pei        StartY
+                _GTESetBG0Origin
+                bra        :do_render
 :not_s
 
-                    cmp        #'w'
-                    bne        :not_w
-                    lda        StartY
-                    beq        :do_render
-                    dec
-                    jsl        SetBG0YPos
-                    bra        :do_render
+                cmp        #'w'
+                bne        :not_w
+                lda        StartY
+                beq        :do_render
+                dec        StartY
+                pei        StartX
+                pei        StartY
+                _GTESetBG0Origin
+                bra        :do_render
 :not_w
 
 ; Do j,l to move the character left/right
-                    cmp        #'j'
-                    bne        :not_j
-                    lda        PlayerXVel
-                    bpl        :pos_xvel
-                    cmp        #$FFFA
-                    bcc        :not_j
-:pos_xvel           dec
-                    dec
-                    sta        PlayerXVel
-                    bra        :do_render
+                cmp        #'j'
+                bne        :not_j
+                lda        PlayerXVel
+                bpl        :pos_xvel
+                cmp        #$FFFA
+                bcc        :not_j
+:pos_xvel       dec
+                dec
+                sta        PlayerXVel
+                bra        :do_render
 :not_j
 
-                    cmp        #'l'
-                    bne        :not_l
-                    lda        PlayerXVel
-                    bmi        :neg_xvel
-                    cmp        #6
-                    bcs        :not_l
-:neg_xvel           inc
-                    inc
-                    sta        PlayerXVel
-                    bra        :do_render
+                cmp        #'l'
+                bne        :not_l
+                lda        PlayerXVel
+                bmi        :neg_xvel
+                cmp        #6
+                bcs        :not_l
+:neg_xvel       inc
+                inc
+                sta        PlayerXVel
+                bra        :do_render
 :not_l
 
-
 ; Update the camera position
-
 :do_render
-                    jsr        UpdatePlayerPos        ; Moves in global cordinates
-                    jsr        UpdateCameraPos        ; Moves the screen
-                    jsr        UpdatePlayerLocal      ; Gets local sprite coordinates
+                jsr        UpdatePlayerPos        ; Moves in global cordinates
+                jsr        UpdateCameraPos        ; Moves the screen
+                jsr        UpdatePlayerLocal      ; Gets local sprite coordinates
 
-                    lda        PlayerID
-                    ldx        PlayerX
-                    ldy        PlayerY
-                    jsl        MoveSprite             ; Move the sprite to this local position
+                pea        HERO_SLOT
+                lda        PlayerX
+                pha
+                lda        PlayerY
+                pha
+                _GTEMoveSprite                    ; Move the sprite to this local position
 
 ; Update the timers
-                    jsl        DoTimers
+;                jsl        DoTimers
 
 ; Let's see what it looks like!
 
-                    lda        vsync
-                    beq        :no_vsync
-:vsyncloop          jsl        GetVerticalCounter     ; 8-bit value
-                    cmp        ScreenY0
-                    bcc        :vsyncloop
-                    sec
-                    sbc        ScreenY0
-                    cmp        #8
-                    bcs        :vsyncloop
-                    lda        #1
-                    jsl        SetBorderColor
-:no_vsync
-                    jsl        Render
+;                    lda        vsync
+;                    beq        :no_vsync
+;:vsyncloop          jsl        GetVerticalCounter     ; 8-bit value
+;                    cmp        ScreenY0
+;                    bcc        :vsyncloop
+;                    sec
+;                    sbc        ScreenY0
+;                    cmp        #8
+;                    bcs        :vsyncloop
+;                    lda        #1
+;                    jsl        SetBorderColor
+;:no_vsync
+                    _GTERender
     
-                    lda        vsync
-                    beq        :no_vsync2
-                    lda        #0
-                    jsl        SetBorderColor
-:no_vsync2
+;                    lda        vsync
+;                    beq        :no_vsync2
+;                    lda        #0
+;                    jsl        SetBorderColor
+;:no_vsync2
 
 ; Update the performance counters
 
                     inc        frameCount
-                    ldal       OneSecondCounter
+                    pha
+                    _GTEGetSeconds
+                    pla
                     cmp        oldOneSecondCounter
                     beq        :noudt
                     sta        oldOneSecondCounter
@@ -298,19 +358,29 @@ EvtLoop
 
 ; Exit code
 Exit
-                    jsl        EngineShutDown
-
+                    _GTEShutDown
                     _QuitGS    qtRec
 
                     bcs        Fatal
 Fatal               brk        $00
 
+Hold
+                _GTERender
+:busy
+                pha
+                _GTEReadControl
+                pla
+                and   #$00FF
+                cmp   #'q'
+                bne   :busy
+                jmp   Exit
+
 BG1DataFile         strl       '1/sunset.c1'
 
 ; Color palette
 MyPalette           dw         $068F,$0EDA,$0000,$0000,$0BF1,$00A0,$0EEE,$0456,$0FA4,$0F59,$0E30,$01CE,$02E3,$0870,$0F93,$0FD7
 ; B&W Palette
-;MyPalette           dw         $0000,$0EDA,$0000,$0E51,$0BF1,$00A0,$0EEE,$0456,$0FA4,$0F59,$0E30,$01CE,$02E3,$0870,$0F93,$0FFF
+; MyPalette           dw         $0000,$0EDA,$0000,$0E51,$0BF1,$00A0,$0EEE,$0456,$0FA4,$0F59,$0E30,$01CE,$02E3,$0870,$0F93,$0FFF
 PlayerGlobalX       ds         2
 PlayerGlobalY       ds         2
 
@@ -331,6 +401,8 @@ MaxBG0Y             ds         2
 
 oldOneSecondCounter  ds    2
 frameCount           ds    2
+MyUserId             ds    2
+MyDirectPage         ds    2
 
 PLAYER_X_MIN        equ   0
 PLAYER_X_MAX        equ   160-4
@@ -339,22 +411,31 @@ PLAYER_Y_MAX        equ   200-8
 
 EMPTY_TILE          equ   33              ; the tile that makes up the background
 
-AdjustLocalX
-                    clc
-                    adc        StartXMod164
-                    cmp        #164
-                    bcc        *+5
-                    sbc        #164
-                    rts
-AdjustLocalY
-                    clc
-                    adc        StartYMod208
-                    cmp        #208
-                    bcc        *+5
-                    sbc        #208
-                    rts
-
 SetLimits
+                    pha                       ; Allocate space for width (in tiles), height (in tiles), pointer
+                    pha
+                    pha
+                    pha
+                    _GTEGetBG0TileMapInfo
+                    pla
+                    sta        TileMapWidth
+                    pla
+                    sta        TileMapHeight
+                    pla
+                    pla                       ; discard the pointer
+
+                    pha                       ; Allocate space for x, y, width, height
+                    pha
+                    pha
+                    pha
+                    _GTEGetScreenInfo
+                    pla
+                    pla                       ; Discard screen corner
+                    pla
+                    sta        ScreenWidth
+                    pla
+                    sta        ScreenHeight
+
                     lda        TileMapWidth
                     asl
                     asl
@@ -373,38 +454,44 @@ SetLimits
                     sta        MaxBG0Y
                     rts
 
-; Set the scroll position based on the global cooridinate of the player
+; Set the scroll position based on the global coordinates of the player
 ; Try to center the player on the screen
 UpdateCameraPos
                     lda        ScreenWidth
                     lsr
-                    sta        tmp0
+                    sta        appTmp0
                     lda        PlayerGlobalX
                     sec
-                    sbc        tmp0
+                    sbc        appTmp0
                     bpl        :x_pos
                     lda        #0
 :x_pos              cmp        MaxBG0X
                     bcc        :x_ok
                     lda        MaxBG0X
-:x_ok               jsl        SetBG0XPos
+:x_ok               sta        StartX
 
                     lda        ScreenHeight
                     lsr
-                    sta        tmp0
+                    sta        appTmp0
                     lda        PlayerGlobalY
                     sec
-                    sbc        tmp0
+                    sbc        appTmp0
                     bpl        :y_pos
                     lda        #0
 :y_pos              cmp        MaxBG0Y
                     bcc        :y_ok
                     lda        MaxBG0Y
-:y_ok               jsl        SetBG0YPos
+:y_ok               sta        StartY
 
+                    pei        StartX
+                    pei        StartY
+                    _GTESetBG0Origin
+
+                    pea        $0000
                     lda        StartY
                     lsr
-                    jsl        SetBG1YPos
+                    pha
+                    _GTESetBG1Origin
                     rts
 
 ; Convert the global coordinates to adjusted local coordinated (compensating for wrap-around)
@@ -412,13 +499,11 @@ UpdatePlayerLocal
             lda  PlayerGlobalX
             sec
             sbc  StartX
-;            jsr  AdjustLocalX
             sta  PlayerX
 
             lda  PlayerGlobalY
             sec
             sbc  StartY
-;            jsr  AdjustLocalY
             sta  PlayerY
             rts
 
@@ -431,13 +516,16 @@ UpdatePlayerPos
 
 ; Check if the player is standing on the ground at their current local position
 
-            ldx  PlayerX
+            pha                         ; space for result
+            lda  PlayerX
+            pha
             lda  PlayerY
             clc
             adc  #16
-            tay
-            jsr  GetTileAt
-            and  #$1FF
+            pha
+            _GTEGetTileAt
+            pla
+            and  #TILE_ID_MASK
             cmp  #EMPTY_TILE
             beq  :no_ground_check
 
@@ -501,7 +589,7 @@ UpdatePlayerPos
 
             txa
             ora  LastHFlip
-            ora  #SPRITE_ID
+            ora  #HERO_ID
             sta  SpriteFrame
 
             lda  SpriteCount
@@ -514,7 +602,7 @@ UpdatePlayerPos
             lda  PlayerXVel
             beq  :frame
 
-            jsl  GetVBLTicks
+            jsr  _GetVBLTicks
             and  #$0003
             inc
             and  #$0003
@@ -527,65 +615,21 @@ UpdatePlayerPos
             tax
 
             lda  PlayerID
-            jsl  UpdateSprite                          ; Change the tile ID and / or flags
+;            jsl  UpdateSprite                          ; Change the tile ID and / or flags
 
+;            pea   HERO_SLOT
+;            pei   Flips                         ; with these flags (h/v flip)
+;            pea   VBUFF_SPRITE_START            ; and use this stamp
+;            _GTEUpdateSprite
+            
             rts
 
+ToolPath        str   '1/Tool160'
 LastHFlip       dw   0
 SpriteFrame     ds   2
 SpriteCount     dw   0
 SpriteToggle    dw   0
 
-; X = coordinate
-; Y = coordinate
-GetTileAt
-                txa
-                bmi  :out
-                clc
-                adc  StartXMod164
-                cmp  #164
-                bcc  *+5
-                sbc  #164
-                
-                lsr
-                lsr
-                tax
-
-                tya
-                bmi  :out
-                clc
-                adc  StartYMod208
-                cmp  #208
-                bcc  *+5
-                sbc  #208
-
-                lsr
-                lsr
-                lsr
-                tay
-
-                jsl   GetTileStoreOffset
-                tax
-                ldal  TileStore+TS_TILE_ID,x
-                rts
-
-:out
-                lda  #EMPTY_TILE
-                rts
-
-; Position the screen with the botom-left corner of the tilemap visible
-MovePlayerToOrigin
-                    lda        #0                      ; Set the player's position
-                    jsl        SetBG0XPos
-
-                    lda        TileMapHeight
-                    asl
-                    asl
-                    asl
-                    sec
-                    sbc        ScreenHeight
-                    jsl        SetBG0YPos
-                    rts
 
 openRec             dw         2                       ; pCount
                     ds         2                       ; refNum
@@ -657,8 +701,91 @@ msgLine2            str        'Press a key :'
 msgLine3            str        ' -> Return to Try Again'
 msgLine4            str        ' -> Esc to Quit'
 
-                    PUT        ../shell/Overlay.s
-                    PUT        gen/App.TileMapBG0.s
-                    PUT        gen/App.TileSetAnim.s
 
-ANGLEBNK            ENT
\ No newline at end of file
+; Load the GTE User Tool and install it
+GTEStartUp
+                pea   $0000
+                _LoaderStatus
+                pla
+
+                pea   $0000
+                pea   $0000
+                pea   $0000
+                pea   $0000
+                pea   $0000                   ; result space
+
+                lda   MyUserId
+                pha
+
+                pea   #^ToolPath
+                pea   #ToolPath
+                pea   $0001                   ; do not load into special memory
+                _InitialLoad
+                bcc    :ok1
+                brk    $01
+
+:ok1
+                ply
+                pla                           ; Address of the loaded tool
+                plx
+                ply
+                ply
+
+                pea   $8000                   ; User toolset
+                pea   $00A0                   ; Set the tool set number
+                phx
+                pha                           ; Address of function pointer table
+                _SetTSPtr
+                bcc    :ok2
+                brk    $02
+
+:ok2
+                clc                             ; Give GTE a page of direct page memory
+                tdc
+                adc   #$0100
+                pha
+                pea   #ENGINE_MODE_DYN_TILES+ENGINE_MODE_TWO_LAYER   ; Enable Dynamic Tiles and Two Layer
+                lda   MyUserId                  ; Pass the userId for memory allocation
+                pha
+                _GTEStartUp
+                bcc    :ok3
+                brk    $03
+
+:ok3
+                rts
+
+_Deref          MAC
+                phb                   ; save caller's data bank register
+                pha                   ; push high word of handle on stack
+                plb                   ; sets B to the bank byte of the pointer
+                lda   |$0002,x        ; load the high word of the master pointer
+                pha                   ; and save it on the stack
+                lda   |$0000,x        ; load the low word of the master pointer
+                tax                   ; and return it in X
+                pla                   ; restore the high word in A
+                plb                   ; pull the handle's high word high byte off the
+                                      ; stack
+                plb                   ; restore the caller's data bank register    
+                <<<
+
+AllocBank      PushLong  #0
+               PushLong  #$10000
+               PushWord  MyUserId
+               PushWord  #%11000000_00011100
+               PushLong  #0
+               _NewHandle
+               plx                                   ; base address of the new handle
+               pla                                   ; high address 00XX of the new handle (bank)
+               _Deref
+               rts
+
+_GetVBLTicks
+                PushLong  #0
+                _GetTick
+                pla
+                plx
+                rts
+
+                PUT        ../shell/Overlay.s
+                PUT        gen/App.TileMapBG0.s
+                PUT        gen/App.TileSetAnim.s
diff --git a/demos/sprites/App.s b/demos/sprites/App.s
index 9a1c19e..0b40d41 100644
--- a/demos/sprites/App.s
+++ b/demos/sprites/App.s
@@ -7,31 +7,9 @@
 ; Segment #1 -- Main execution block
 
             ASM   App.Main.s
-            DS    0                    ;   Number of bytes of 0's to add at the end of the Segment
-            KND   #$1100               ;   Type and Attributes ($11=Static+Bank Relative,$00=Code)
-            ALI   None                 ;   Boundary Alignment (None)
             SNA   Main
 
-; Segment #2 -- Core GTE Code
-
-            ASM   ..\..\src\Core.s
-            SNA   Core
-
-; Segment #3 -- 64KB Tile Memory
+; Segment #2 -- Tileset
 
             ASM   gen\App.TileSet.s
-            DS    0
-            KND   #$1001               ; Type and Attributes ($11=Static+Bank Relative,$01=Data)
-            SNA   Tiles
-
-; Segment #4 -- 64KB Sprite Plane Data
-
-            ASM   SprData.s
-            KND   #$1001               ; Type and Attributes ($11=Static+Bank Relative,$01=Data)
-            SNA   SPRDATA
-
-; Segment #5 -- 64KB Sprite Mask Data
-
-            ASM   SprMask.s
-            KND   #$1001               ; Type and Attributes ($11=Static+Bank Relative,$01=Data)
-            SNA   SPRMASK
+            SNA   TSET
\ No newline at end of file
diff --git a/demos/sprites/_FileInformation.txt b/demos/sprites/_FileInformation.txt
index 3d84606..5120c3d 100644
--- a/demos/sprites/_FileInformation.txt
+++ b/demos/sprites/_FileInformation.txt
@@ -1 +1,2 @@
+GTEZelda=Type(B3),AuxType(0000),VersionCreate(70),MinVersion(BE),Access(E3),FolderInfo1(000000000000000000000000000000000000),FolderInfo2(000000000000000000000000000000000000)
 GTETestSprites=Type(B3),AuxType(0000),VersionCreate(70),MinVersion(BE),Access(E3),FolderInfo1(000000000000000000000000000000000000),FolderInfo2(000000000000000000000000000000000000)
diff --git a/demos/sprites/assets/tiled/world_1-1.tmx b/demos/sprites/assets/tiled/world_1-1.tmx
index c9ef6bc..65bbbfd 100644
--- a/demos/sprites/assets/tiled/world_1-1.tmx
+++ b/demos/sprites/assets/tiled/world_1-1.tmx
@@ -14,24 +14,24 @@
 33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,185,186,186,187,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,
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 33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,185,186,186,187,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,185,186,186,186,186,186,186,187,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,185,186,186,186,186,186,186,187,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,55,56,10,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,
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 33,33,48,21,21,21,21,51,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,49,2147483697,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,15,16,17,18,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,19,20,21,22,33,33,33,33,33,33,33,33,33,33,33,33,19,20,21,22,33,33,48,21,21,21,21,51,33,33,33,33,33,33,33,33,33,33,19,20,21,22,33,33,33,33,33,33,33,33,33,33,33,33,49,50,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,48,21,21,21,21,51,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,49,50,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,7,8,7,8,7,8,33,33,33,33,7,8,7,8,7,8,33,33,33,33,48,21,21,21,21,51,33,33,7,8,7,8,7,8,7,8,33,33,33,33,7,8,7,8,7,8,33,33,33,33,33,33,49,50,33,33,15,16,17,18,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,15,16,17,18,33,33,7,8,7,8,7,8,7,8,7,8,7,8,7,8,7,8,33,33,33,33,33,33,48,21,21,21,21,51,33,33,33,33,9,10,33,33,33,33,33,33,26,26,26,26,64,64,26,26,26,26,33,33,
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-48,21,21,21,21,21,21,21,21,51,33,33,33,33,33,33,33,33,33,33,33,33,33,36,37,37,37,37,37,37,38,33,48,21,21,21,21,2147483696,33,119,118,119,118,119,118,119,118,36,37,37,38,33,119,118,119,118,19,20,21,22,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,19,20,21,22,33,33,33,36,37,37,37,37,38,33,33,33,19,20,21,22,48,21,21,21,21,21,21,21,21,51,33,33,33,33,33,33,33,33,19,20,21,22,33,36,37,37,37,37,37,37,38,33,48,21,21,21,21,51,33,33,33,33,33,33,33,33,33,36,37,37,38,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,36,37,37,37,37,38,33,33,33,33,33,33,33,48,21,21,21,21,21,21,21,21,51,33,33,33,33,33,33,33,33,33,33,33,33,33,36,37,37,37,37,37,37,38,33,48,21,21,21,21,51,33,33,33,33,33,33,33,33,33,36,37,37,38,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,7,8,7,8,7,8,7,8,37,37,37,37,7,8,7,8,7,8,7,8,48,21,21,21,21,21,21,21,7,8,7,8,7,8,7,8,7,8,33,33,33,33,7,8,7,8,7,8,7,8,38,33,48,21,21,21,21,51,19,20,21,22,33,33,33,33,0,36,37,37,38,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,19,20,21,22,7,8,7,8,7,8,7,8,7,8,7,8,7,8,7,8,7,8,33,33,33,33,48,21,21,21,21,21,21,21,21,51,33,33,7,8,33,33,33,33,33,33,26,26,26,26,64,64,26,26,26,26,38,33,
+33,48,21,54,21,21,54,21,51,33,137,138,33,33,33,33,33,33,33,33,33,33,33,33,34,35,34,35,34,35,33,33,33,48,21,54,2147483696,33,33,87,86,87,86,87,86,87,86,33,34,35,33,33,87,86,87,86,19,20,21,22,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,19,20,21,22,33,33,33,33,34,35,34,35,33,33,33,33,19,20,21,22,33,48,21,54,21,21,54,21,51,33,33,33,33,33,33,33,33,33,19,20,21,22,33,33,34,35,34,35,34,35,33,33,33,48,21,54,51,33,33,33,33,33,33,33,33,33,33,33,34,35,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,34,35,34,35,33,33,33,33,33,33,33,33,33,48,21,54,21,21,54,21,51,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,34,35,34,35,34,35,33,33,33,48,21,54,51,33,33,33,33,33,33,33,33,33,33,33,34,35,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,5,6,5,6,5,6,5,6,34,35,34,35,5,6,5,6,5,6,5,6,33,48,21,54,21,21,54,21,5,6,5,6,5,6,5,6,5,6,33,33,33,33,5,6,5,6,5,6,5,6,33,33,33,48,21,54,51,33,19,20,21,22,33,33,33,33,0,33,34,35,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,19,20,21,22,5,6,5,6,5,6,5,6,5,6,5,6,5,6,5,6,5,6,33,33,33,33,33,48,21,54,21,21,54,21,51,33,33,33,5,6,33,33,33,33,33,33,26,26,26,26,64,64,26,26,26,26,33,33,
+48,21,21,21,21,21,21,21,21,51,169,170,33,33,33,33,33,33,33,33,33,33,33,36,37,37,37,37,37,37,38,33,48,21,21,21,21,2147483696,33,119,118,119,118,119,118,119,118,36,37,37,38,33,119,118,119,118,19,20,21,22,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,19,20,21,22,33,33,33,36,37,37,37,37,38,33,33,33,19,20,21,22,48,21,21,21,21,21,21,21,21,51,33,33,33,33,33,33,33,33,19,20,21,22,33,36,37,37,37,37,37,37,38,33,48,21,21,21,21,51,33,33,33,33,33,33,33,33,33,36,37,37,38,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,36,37,37,37,37,38,33,33,33,33,33,33,33,48,21,21,21,21,21,21,21,21,51,33,33,33,33,33,33,33,33,33,33,33,33,33,36,37,37,37,37,37,37,38,33,48,21,21,21,21,51,33,33,33,33,33,33,33,33,33,36,37,37,38,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,7,8,7,8,7,8,7,8,37,37,37,37,7,8,7,8,7,8,7,8,48,21,21,21,21,21,21,21,7,8,7,8,7,8,7,8,7,8,33,33,33,33,7,8,7,8,7,8,7,8,38,33,48,21,21,21,21,51,19,20,21,22,33,33,33,33,0,36,37,37,38,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,19,20,21,22,7,8,7,8,7,8,7,8,7,8,7,8,7,8,7,8,7,8,33,33,33,33,48,21,21,21,21,21,21,21,21,51,33,33,7,8,33,33,33,33,33,33,26,26,26,26,64,64,26,26,26,26,38,33,
 1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,33,33,33,33,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,33,33,33,33,33,33,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,33,33,33,33,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,
 3,4,3,4,3,4,3,4,3,4,3,4,3,4,3,4,3,4,3,4,3,4,3,4,3,4,3,4,3,4,3,4,3,4,3,4,3,4,3,4,3,4,3,4,3,4,3,4,3,4,3,4,3,4,3,4,3,4,3,4,3,4,3,4,3,4,3,4,3,4,3,4,3,4,3,4,3,4,3,4,3,4,3,4,3,4,3,4,3,4,3,4,3,4,3,4,3,4,3,4,3,4,3,4,3,4,3,4,3,4,3,4,3,4,3,4,3,4,3,4,3,4,3,4,3,4,3,4,3,4,3,4,3,4,3,4,3,4,33,33,33,33,3,4,3,4,3,4,3,4,3,4,3,4,3,4,3,4,3,4,3,4,3,4,3,4,3,4,3,4,3,4,33,33,33,33,33,33,3,4,3,4,3,4,3,4,3,4,3,4,3,4,3,4,3,4,3,4,3,4,3,4,3,4,3,4,3,4,3,4,3,4,3,4,3,4,3,4,3,4,3,4,3,4,3,4,3,4,3,4,3,4,3,4,3,4,3,4,3,4,3,4,3,4,3,4,3,4,3,4,3,4,3,4,3,4,3,4,3,4,3,4,3,4,3,4,3,4,3,4,3,4,3,4,3,4,3,4,3,4,3,4,3,4,3,4,3,4,3,4,3,4,3,4,3,4,3,4,3,4,3,4,3,4,3,4,33,33,33,33,3,4,3,4,3,4,3,4,3,4,3,4,3,4,3,4,3,4,3,4,3,4,3,4,3,4,3,4,3,4,3,4,3,4,3,4,3,4,3,4,3,4,3,4,3,4,3,4,3,4,3,4,3,4,3,4,3,4,3,4,3,4,3,4,3,4,3,4,3,4,3,4,3,4,3,4,3,4,3,4,3,4,3,4,3,4,3,4,3,4,3,4,3,4,3,4,3,4,3,4,3,4,3,4,3,4,
 1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,33,33,33,33,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,33,33,33,33,33,33,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,33,33,33,33,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,
diff --git a/demos/sprites/build-image.bat b/demos/sprites/build-image.bat
index f1f3ca4..df1a762 100644
--- a/demos/sprites/build-image.bat
+++ b/demos/sprites/build-image.bat
@@ -14,6 +14,7 @@ REM Cadius does not overwrite files, so clear the root folder first
 
 REM Now copy files and folders as needed
 %CADIUS% ADDFILE %IMAGE% %FOLDER% .\GTETestSprites
+%CADIUS% ADDFILE %IMAGE% %FOLDER% ..\..\src\Tool160
 
 REM Copy in the image assets
 %CADIUS% ADDFILE %IMAGE% %FOLDER% .\assets\mario1.c1
diff --git a/demos/sprites/gen/App.TileMapBG0.s b/demos/sprites/gen/App.TileMapBG0.s
index 2f69a2a..7eb48ac 100644
--- a/demos/sprites/gen/App.TileMapBG0.s
+++ b/demos/sprites/gen/App.TileMapBG0.s
@@ -5,14 +5,19 @@
 
 
 BG0SetUp
-        lda #416
-        sta TileMapWidth
-        lda #30
-        sta TileMapHeight
-        lda #App_TileMapBG0
-        sta TileMapPtr
-        lda #^App_TileMapBG0
-        sta TileMapPtr+2
+         pea #416
+         pea #30
+         pea #^App_TileMapBG0
+         pea  #App_TileMapBG0
+         _GTESetBG0TileMapInfo
+;        lda #416
+;        sta TileMapWidth
+;        lda #30
+;        sta TileMapHeight
+;        lda #App_TileMapBG0
+;        sta TileMapPtr
+;        lda #^App_TileMapBG0
+;        sta TileMapPtr+2
         rts
     
 App_TileMapBG0
diff --git a/demos/sprites/gen/App.TileSet.s b/demos/sprites/gen/App.TileSet.s
index e8b3b9d..ffddae4 100644
--- a/demos/sprites/gen/App.TileSet.s
+++ b/demos/sprites/gen/App.TileSet.s
@@ -2,7 +2,7 @@
 ; Palette:
 ; $068F,$0EDA,$0000,$0F0F,$0BF1,$00A0,$0EEE,$0456,$0FA4,$0F59,$0E30,$01CE,$02E3,$0870,$0F93,$0FD7
 ; Converting to BG0 format...
-tiledata    ENT
+TSet    ENT
 
 ; Reserved space (tile 0 is special...
             ds 128
diff --git a/demos/sprites/gen/App.TileSetAnim.s b/demos/sprites/gen/App.TileSetAnim.s
index 1f4d5be..142fb2d 100644
--- a/demos/sprites/gen/App.TileSetAnim.s
+++ b/demos/sprites/gen/App.TileSetAnim.s
@@ -1,52 +1,40 @@
 
-TileAnimInit    ENT
+TileAnimInit
+            pea #137
+            pea #0
+            _GTECopyTileToDynamic
+            pea #138
+            pea #1
+            _GTECopyTileToDynamic
+            pea #169
+            pea #2
+            _GTECopyTileToDynamic
+            pea #170
+            pea #3
+            _GTECopyTileToDynamic
 
-            ldx #137
-            ldy #0
-            jsl CopyTileToDyn
-            ldx #138
-            ldy #1
-            jsl CopyTileToDyn
-            ldx #169
-            ldy #2
-            jsl CopyTileToDyn
-            ldx #170
-            ldy #3
-            jsl CopyTileToDyn
-            lda #TileAnim_136
-            ldx #^TileAnim_136
-            ldy #15
-            jsl StartScript
-            lda #TileAnim_137
-            ldx #^TileAnim_137
-            ldy #15
-            jsl StartScript
-            lda #TileAnim_168
-            ldx #^TileAnim_168
-            ldy #15
-            jsl StartScript
-            lda #TileAnim_169
-            ldx #^TileAnim_169
-            ldy #15
-            jsl StartScript
+            pea #15
+            pea #^TileAnim
+            pea #TileAnim
+            _GTEStartScript
             rts
-TileAnim_136
-            dw $8006,137,0,0
-            dw $8006,139,0,0
-            dw $8006,141,0,0
-            dw $cd06,143,0,0
-TileAnim_137
-            dw $8006,138,1,0
-            dw $8006,140,1,0
-            dw $8006,142,1,0
-            dw $cd06,144,1,0
-TileAnim_168
-            dw $8006,169,2,0
-            dw $8006,171,2,0
-            dw $8006,173,2,0
-            dw $cd06,175,2,0
-TileAnim_169
+TileAnim
+            dw $0006,137,0,0
+            dw $0006,138,1,0
+            dw $0006,169,2,0
             dw $8006,170,3,0
+
+            dw $0006,139,0,0
+            dw $0006,140,1,0
+            dw $0006,171,2,0
             dw $8006,172,3,0
+
+            dw $0006,141,0,0
+            dw $0006,142,1,0
+            dw $0006,173,2,0
             dw $8006,174,3,0
-            dw $cd06,176,3,0
\ No newline at end of file
+
+            dw $0006,143,0,0
+            dw $0006,144,1,0
+            dw $0006,175,2,0
+            dw $cc46,176,3,0          ; STOP; JUMP(-15)  -15 = $31 (6 bit) = %110001 = 1100 0100 = C4
diff --git a/demos/sprites/package.json b/demos/sprites/package.json
index 936a5c6..a3a4e0c 100644
--- a/demos/sprites/package.json
+++ b/demos/sprites/package.json
@@ -15,11 +15,13 @@
   "scripts": {
     "test": "npm run build && build-image.bat %npm_package_config_cadius% && %npm_package_config_gsport%",
     "debug": "%npm_package_config_crossrunner% GTETestSprites -Source GTETestSprites_S02_MAINSEG_Output.txt -Debug -CompatibilityLayer",
-    "build": "%npm_package_config_merlin32% -V %npm_package_config_macros% App.s",
+    "build:sys16": "%npm_package_config_merlin32% -V %npm_package_config_macros% App.s",
     "build:map": "node %npm_package_config_tiled2iigs% ./assets/tiled/world_1-1.json --output-dir ./gen",
     "build:map:masked": "node %npm_package_config_tiled2iigs% ./assets/tiled/world_1-1.json --force-masked --empty-tile 33 --no-gen-tiles --output-dir ./gen",
     "build:tiles": "node %npm_package_config_png2iigs% ../shell/assets/tilesets/smb-256-128-4bpp.png --max-tiles 360 --as-tile-data --transparent-color FF00FF --background-color 6B8CFF > ./gen/App.TileSet.s",
-    "build:tiles:1bpp": "node %npm_package_config_png2iigs% ../shell/assets/tilesets/smb-256-128-1bpp.png --max-tiles 360 --as-tile-data --transparent-color FF00FF --palette 010102,00000,000000,000000,000000,000000,000000,000000,000000,000000,000000,000000,000000,000000,000000,FDFEFE > ./gen/App.TileSet.s"
+    "build:tiles:1bpp": "node %npm_package_config_png2iigs% ../shell/assets/tilesets/smb-256-128-1bpp.png --max-tiles 360 --as-tile-data --transparent-color FF00FF --palette 010102,00000,000000,000000,000000,000000,000000,000000,000000,000000,000000,000000,000000,000000,000000,FDFEFE > ./gen/App.TileSet.s",
+    "build": "npm run build:tool && npm run build:sys16",
+    "build:tool": "%npm_package_config_merlin32% -V %npm_package_config_macros% ../../src/Master.s"
   },
   "repository": {
     "type": "git",
diff --git a/demos/tool/.gitignore b/demos/tool/.gitignore
new file mode 100644
index 0000000..ef9cf26
--- /dev/null
+++ b/demos/tool/.gitignore
@@ -0,0 +1 @@
+GTEToolDemo
\ No newline at end of file
diff --git a/demos/tool/App.Main.s b/demos/tool/App.Main.s
new file mode 100644
index 0000000..179db9e
--- /dev/null
+++ b/demos/tool/App.Main.s
@@ -0,0 +1,654 @@
+                REL
+                DSK   MAINSEG
+
+                use   Locator.Macs
+                use   Load.Macs
+                use   Mem.Macs
+                use   Misc.Macs
+                use   Util.Macs
+                use   EDS.GSOS.Macs
+                use   GTE.Macs
+
+                mx         %00
+
+TSZelda         EXT                           ; tileset buffer
+
+MAX_SPRITES     equ   16
+
+ScreenX         equ   0
+ScreenY         equ   2
+Tmp0            equ   4
+Tmp1            equ   6
+KeyState        equ   8
+Selected        equ   10
+Flips           equ   12
+DTile           equ   14
+Tmp2            equ   16
+
+; Typical init
+                phk
+                plb
+
+                sta   MyUserId                ; GS/OS passes the memory manager user ID for the application into the program
+                _MTStartUp                    ; GTE requires the miscellaneous toolset to be running
+
+                jsr   GTEStartUp              ; Load and install the GTE User Tool
+
+; Initialize the graphics screen to a 256x160 playfield
+
+                pea   #320
+                pea   #200
+                _GTESetScreenMode
+
+; Load a tileset
+
+                pea   #^TSZelda
+                pea   #TSZelda
+                _GTELoadTileSet
+
+; Set the palette
+                ldx   #11*2
+:ploop
+                lda   palette,x
+                stal  $E19E00,x
+                dex
+                dex
+                bpl   :ploop
+                bra   sprt
+
+palette dw $0000,$08C1,$0C41,$0F93,$0777,$0FDA,$00A0,$0000,$0D20,$0FFF,$023E
+sprt
+
+; Create stamps for the sprites we are going to use
+HERO_SPRITE     equ   SPRITE_16X16+1
+
+                pea   HERO_SPRITE                   ; sprint id
+                pea   VBUFF_SPRITE_START            ; vbuff address
+                _GTECreateSpriteStamp
+
+; Create sprites
+                stz   Tmp0
+                stz   Tmp1
+
+                ldx   Tmp0
+:sloop
+                pea   HERO_SPRITE                   ; sprite id
+                lda   PlayerX,x
+                pha
+                lda   PlayerY,x
+                pha
+                pei   Tmp1
+                _GTEAddSprite
+
+                pei   Tmp1                          ; update the sprite in this slot
+                pea   $0000                         ; with these flags (h/v flip)
+                pea   VBUFF_SPRITE_START            ; and use this stamp
+                _GTEUpdateSprite
+
+                inc   Tmp1
+                ldx   Tmp0
+                inx
+                inx
+                stx   Tmp0
+                cpx   #MAX_SPRITES*2
+                bcc   :sloop
+
+; Manually fill in the 41x26 tiles of the TileStore with a test pattern of trees
+
+;               lda   #TILE_DYN_BIT+TILE_PRIORITY_BIT+0                ; fill the screen the the dynamic tile slot 0
+                lda   #TILE_DYN_BIT+0                ; fill the screen the the dynamic tile slot 0
+                jsr   _fillTileStore
+;                brl   :no_trees
+
+                ldx   #0
+                ldy   #0
+                jsr   _drawTree
+
+                ldx   #3
+                ldy   #0
+                jsr   _drawTreeH
+
+                ldx   #0
+                ldy   #3
+                jsr   _drawTreeV
+
+                ldx   #3
+                ldy   #3
+                jsr   _drawTreeHV
+
+                ldx   #9
+                ldy   #0
+                jsr   _drawTree
+
+                ldx   #9
+                ldy   #3
+                jsr   _drawTree
+
+                ldx   #12
+                ldy   #0
+                jsr   _drawTree
+
+                ldx   #12
+                ldy   #3
+                jsr   _drawTree
+
+                ldx   #6
+                ldy   #0
+                jsr   _drawTreeFront
+
+                ldx   #6
+                ldy   #3
+                jsr   _drawTreeFront
+
+                ldx   #6
+                ldy   #6
+                jsr   _drawTreeFront
+
+                ldx   #3
+                ldy   #6
+                jsr   _drawTreeFront
+
+                ldx   #0
+                ldy   #6
+                jsr   _drawTreeFront
+:no_trees
+; Set up the dynamic tile
+                lda   #65
+                sta   DTile
+
+                pei   DTile
+                pea   $0000
+                _GTECopyTileToDynamic                ; Copy DTile into the first dynamic tile slot
+
+; Initialize the frame counter
+
+                stz   FrameCount
+
+; Set the screen coordinates
+
+                lda   #128
+                sta   ScreenX
+                lda   #128
+                sta   ScreenY
+
+                stz   Selected
+                stz   Flips
+
+; Very simple actions
+:evt_loop
+                pha                           ; space for result, with pattern
+                _GTEReadControl
+                pla
+                and   #$00FF
+                cmp   #'q'
+                bne   :2
+                brl   :exit
+:2
+;                cmp    KeyState
+;                beq    :evt_loop
+;                sta    KeyState
+;                cmp    #0
+;                beq    :evt_loop
+
+;                cmp   #' '
+;                bne   :evt_loop              ; only advance one frame at a time
+;                brl   :next
+
+:3
+                cmp   #'1'
+                bcc   :3a
+                cmp   #'9'
+                bcs   :3a
+                sec
+                sbc   #'1'
+                asl
+                sta   Selected
+                brl   :next
+
+:3a
+                cmp   #'r'
+                bne   :3b
+                lda    Flips
+                clc
+                adc    #SPRITE_HFLIP
+                and    #SPRITE_VFLIP+SPRITE_HFLIP
+                sta    Flips
+                
+                pei   Selected                      ; update the sprite in this slot
+                pei   Flips                         ; with these flags (h/v flip)
+                pea   VBUFF_SPRITE_START            ; and use this stamp
+                _GTEUpdateSprite
+
+:3b
+                cmp   #'x'
+                bne   :3d
+                ldx   Selected
+                lda   PlayerX,x
+                clc
+                adc   PlayerU,x
+                sta   PlayerX,x
+
+                lda   PlayerY,x
+                clc
+                adc   PlayerV,x
+                sta   PlayerY,x
+                brl   :next
+:3d
+                cmp   #'z'
+                bne   :3e
+                ldx   Selected
+                lda   PlayerX,x
+                sec
+                sbc   PlayerU,x
+                sta   PlayerX,x
+
+                lda   PlayerY,x
+                sec
+                sbc   PlayerV,x
+                sta   PlayerY,x
+                brl   :next
+:3e
+                cmp   #'s'
+                bne   :4
+                ldx   Selected
+                inc   PlayerY,x
+                brl   :next
+:4
+                cmp   #'w'
+                bne   :5
+                ldx   Selected
+                dec   PlayerY,x
+                brl   :next
+:5
+                cmp   #'d'
+                bne   :6
+                ldx   Selected
+                inc   PlayerX,x
+                brl   :next
+:6
+                cmp   #'a'
+                bne   :7
+                ldx   Selected
+                dec   PlayerX,x
+                brl   :next
+:7
+                cmp   #$15                    ; left = $08, right = $15, up = $0B, down = $0A
+                bne   :8
+                inc   ScreenX
+                bra   :next
+
+:8              cmp   #$08
+                bne   :9
+                dec   ScreenX
+                brl   :next
+
+:9              cmp   #$0B
+                bne   :10
+                inc   ScreenY
+                brl   :next
+
+:10             cmp   #$0A
+                bne   :11
+                dec   ScreenY
+                brl   :next
+
+:11             cmp   #'y'
+                bne   :12
+                lda   DTile
+                inc
+                and   #$007F
+                sta   DTile
+                pha
+                pea   $0000
+                _GTECopyTileToDynamic
+                brl   :next
+
+:12             cmp   #'f'
+                bne   :13
+                pea   $0000
+                _GTEFillTileStore
+                brl   :next
+
+:13             cmp   #'m'
+                bne   :next
+                _GTERefresh
+
+:next
+;                inc   ScreenX
+
+                pei   ScreenX
+                pei   ScreenY
+                _GTESetBG0Origin
+
+;                brl   no_animate
+
+                stz   Tmp0
+                stz   Tmp1
+
+                ldx   Tmp0
+loopX
+                lda   PlayerX,x
+                clc
+                adc   PlayerU,x
+                sta   PlayerX,x
+                bpl   is_posx
+                cmp   #-15
+                bcs   do_y
+                lda   PlayerU,x
+                eor   #$FFFF
+                inc
+                sta   PlayerU,x
+                bra   do_y
+is_posx         cmp   #128
+                bcc   do_y
+                lda   PlayerU,x
+                eor   #$FFFF
+                inc
+                sta   PlayerU,x
+
+do_y
+                lda   PlayerY,x
+                clc
+                adc   PlayerV,x
+                sta   PlayerY,x
+                bpl   is_posy
+                cmp   #-15
+                bcs   do_z
+                lda   PlayerV,x
+                eor   #$FFFF
+                inc
+                sta   PlayerV,x
+                bra   do_z
+is_posy         cmp   #160
+                bcc   do_z
+                lda   PlayerV,x
+                eor   #$FFFF
+                inc
+                sta   PlayerV,x
+do_z
+                inc   Tmp1
+                ldx   Tmp0
+                inx
+                inx
+                stx   Tmp0
+                cpx   #MAX_SPRITES*2
+                bcc   loopX
+
+no_animate
+                stz   Tmp0
+                stz   Tmp1
+                ldx   Tmp0
+loopY
+                pei   Tmp1
+                lda   PlayerX,x
+                pha
+                lda   PlayerY,x
+                pha
+                _GTEMoveSprite
+
+                inc   Tmp1
+                ldx   Tmp0
+                inx
+                inx
+                stx   Tmp0
+                cpx   #MAX_SPRITES*2
+                bcc   loopY
+
+                _GTERender
+                inc   FrameCount
+
+; Debug stuff
+                pha
+                _GTEGetSeconds
+                pla
+                cmp   LastSecond
+                beq   :no_fps
+                sta   LastSecond
+                
+                lda   FrameCount
+                ldx   #0
+                ldy   #$FFFF
+                jsr   DrawWord
+
+                stz   FrameCount
+:no_fps
+
+;                tdc
+;                ldx   #160*32
+;                jsr   DrawWord
+
+                brl   :evt_loop
+
+; Shut down everything
+:exit
+                _GTEShutDown
+                _QuitGS qtRec
+qtRec           adrl       $0000
+                da         $00
+
+; Array of sprite positions and velocities
+PlayerX  dw  8,14,29,34,45,67,81,83,92,101,39,22,7,74,111,9
+PlayerY  dw  72,24,13,56,35,72,23,8,93,123,134,87,143,14,46,65
+PlayerU  dw  1,2,3,4,1,2,3,4,1,2,3,4,1,2,3,4
+PlayerV  dw  1,1,1,1,2,2,2,4,3,3,3,3,4,4,4,4
+
+; Load the GTE User Tool and install it
+GTEStartUp
+                pea   $0000
+                _LoaderStatus
+                pla
+
+                pea   $0000
+                pea   $0000
+                pea   $0000
+                pea   $0000
+                pea   $0000                   ; result space
+
+                lda   MyUserId
+                pha
+
+                pea   #^ToolPath
+                pea   #ToolPath
+                pea   $0001                   ; do not load into special memory
+                _InitialLoad
+                bcc    :ok1
+                brk    $01
+
+:ok1
+                ply
+                pla                           ; Address of the loaded tool
+                plx
+                ply
+                ply
+
+                pea   $8000                   ; User toolset
+                pea   $00A0                   ; Set the tool set number
+                phx
+                pha                           ; Address of function pointer table
+                _SetTSPtr
+                bcc    :ok2
+                brk    $02
+
+:ok2
+                clc                             ; Give GTE a page of direct page memory
+                tdc
+                adc   #$0100
+                pha
+                pea   #ENGINE_MODE_DYN_TILES+ENGINE_MODE_TWO_LAYER   ; Enable Dynamic Tiles and Two Layer
+                lda   MyUserId                  ; Pass the userId for memory allocation
+                pha
+                _GTEStartUp
+                bcc    :ok3
+                brk    $03
+
+:ok3
+                rts
+
+_fillTileStore
+                sta    Tmp2
+                stz    Tmp0
+:oloop
+                stz    Tmp1
+:iloop
+                pei    Tmp1
+                pei    Tmp0
+                pei    Tmp2
+                _GTESetTile
+
+                lda    Tmp2
+                eor    #TILE_PRIORITY_BIT
+                sta    Tmp2
+
+                lda    Tmp1
+                inc
+                sta    Tmp1
+                cmp    #41
+                bcc    :iloop
+
+                lda    Tmp0
+                inc
+                sta    Tmp0
+                cmp    #26
+                bcc    :oloop
+                rts
+
+;   Tile 65 Tile 66
+;   Tile 97 Tile 98
+
+_drawTreeFront
+                phx
+                phy
+                pea   #65+TILE_PRIORITY_BIT
+                
+                inx
+                phx
+                phy
+                pea   #66+TILE_PRIORITY_BIT
+
+                iny
+                phx
+                phy
+                pea   #98+TILE_PRIORITY_BIT
+
+                dex
+                phx
+                phy
+                pea   #97+TILE_PRIORITY_BIT
+
+                _GTESetTile
+                _GTESetTile
+                _GTESetTile
+                _GTESetTile
+                rts
+
+_drawTree
+                phx
+                phy
+                pea   #65
+                
+                inx
+                phx
+                phy
+                pea   #66
+
+                iny
+                phx
+                phy
+                pea   #98
+
+                dex
+                phx
+                phy
+                pea   #97
+
+                _GTESetTile
+                _GTESetTile
+                _GTESetTile
+                _GTESetTile
+                rts
+
+_drawTreeH
+                phx
+                phy
+                pea   #66+TILE_HFLIP_BIT
+
+                inx
+                phx
+                phy
+                pea   #65+TILE_HFLIP_BIT
+
+                iny
+                phx
+                phy
+                pea   #97+TILE_HFLIP_BIT
+
+                dex
+                phx
+                phy
+                pea   #98+TILE_HFLIP_BIT
+
+                _GTESetTile
+                _GTESetTile
+                _GTESetTile
+                _GTESetTile
+                rts
+
+_drawTreeV
+                phx
+                phy
+                pea   #97+TILE_VFLIP_BIT
+                
+                inx
+                phx
+                phy
+                pea   #98+TILE_VFLIP_BIT
+
+                iny
+                phx
+                phy
+                pea   #66+TILE_VFLIP_BIT
+
+                dex
+                phx
+                phy
+                pea   #65+TILE_VFLIP_BIT
+
+                _GTESetTile
+                _GTESetTile
+                _GTESetTile
+                _GTESetTile
+                rts
+
+_drawTreeHV
+                phx
+                phy
+                pea   #98+TILE_VFLIP_BIT+TILE_HFLIP_BIT
+                
+                inx
+                phx
+                phy
+                pea   #97+TILE_VFLIP_BIT+TILE_HFLIP_BIT
+
+                iny
+                phx
+                phy
+                pea   #65+TILE_VFLIP_BIT+TILE_HFLIP_BIT
+
+                dex
+                phx
+                phy
+                pea   #66+TILE_VFLIP_BIT+TILE_HFLIP_BIT
+
+                _GTESetTile
+                _GTESetTile
+                _GTESetTile
+                _GTESetTile
+                rts
+
+MyUserId        ds    2
+ToolPath        str   '1/Tool160'
+FrameCount      ds    2
+LastSecond      dw    0
+
+                PUT        App.Msg.s
+                PUT        font.s
diff --git a/demos/tool/App.Msg.s b/demos/tool/App.Msg.s
new file mode 100644
index 0000000..4afc4dd
--- /dev/null
+++ b/demos/tool/App.Msg.s
@@ -0,0 +1,105 @@
+HexToChar      dfb   '0','1','2','3','4','5','6','7','8','9','A','B','C','D','E','F'
+
+; Convert a byte (Acc) into a string and store at (Y)
+ByteToString   and   #$00FF
+               sep   #$20
+               pha
+               lsr
+               lsr
+               lsr
+               lsr
+               and   #$0F
+               tax
+               ldal  HexToChar,x
+               sta:  $0000,y
+
+               pla
+               and   #$0F
+               tax
+               ldal  HexToChar,x
+               sta:  $0001,y
+
+               rep   #$20
+               rts
+
+; Convert a word (Acc) into a hexadecimal string and store at (Y)
+WordToString   pha
+               bra   Addr2ToString
+
+; Pass in Acc = High, X = low
+Addr3ToString  phx
+               jsr   ByteToString
+               iny
+               iny
+               lda   1,s
+Addr2ToString  xba
+               jsr   ByteToString
+               iny
+               iny
+               pla
+               jsr   ByteToString
+               rts
+
+; A=Value
+; X=Screen offset
+DrawWord       phx                  ; Save register value
+               phy
+               ldy   #WordBuff+1
+               jsr   WordToString
+               ply
+               plx
+               lda   #WordBuff
+               jsr   DrawString
+               rts
+
+WordBuff       str   '0000'
+Addr3Buff      str   '000000'       ; str adds leading length byte
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
diff --git a/demos/tool/App.s b/demos/tool/App.s
new file mode 100644
index 0000000..097e4d1
--- /dev/null
+++ b/demos/tool/App.s
@@ -0,0 +1,15 @@
+; IIgs Sprite Testbed
+
+            TYP   $B3                  ; S16 file
+            DSK   GTEToolDemo
+            XPL
+
+; Segment #1 -- Main execution block
+
+            ASM   App.Main.s
+            SNA   Main
+
+; Segment #2 -- Tileset
+
+            ASM   Zelda.TileSet.s
+            SNA   TSET
diff --git a/demos/tool/Zelda.TileSet.s b/demos/tool/Zelda.TileSet.s
new file mode 100644
index 0000000..8743dee
--- /dev/null
+++ b/demos/tool/Zelda.TileSet.s
@@ -0,0 +1,13688 @@
+; startIndex = 0
+; Palette:
+; $0F0F,$08C1,$0C41,$0F93,$0777,$0FDA,$00A0,$0000,$0D20,$0FFF,$023E
+; Converting to BG0 format...
+TSZelda     ENT
+
+; Reserved space (tile 0 is special...
+            ds 128
+; Tile ID 1
+; From image coordinates 0, 0
+            hex   00000111
+            hex   00001111
+            hex   00301222
+            hex   00302222
+            hex   00332313
+            hex   00332323
+            hex   00033333
+            hex   00011332
+
+            hex   fffff000
+            hex   ffff0000
+            hex   ff0f0000
+            hex   ff0f0000
+            hex   ff000000
+            hex   ff000000
+            hex   fff00000
+            hex   fff00000
+
+            hex   11100000
+            hex   11110000
+            hex   22210300
+            hex   22220300
+            hex   31323300
+            hex   32323300
+            hex   33333000
+            hex   23311000
+
+            hex   000fffff
+            hex   0000ffff
+            hex   0000f0ff
+            hex   0000f0ff
+            hex   000000ff
+            hex   000000ff
+            hex   00000fff
+            hex   00000fff
+
+; Tile ID 2
+; From image coordinates 8, 0
+            hex   11100000
+            hex   11110000
+            hex   22210300
+            hex   22220300
+            hex   31323300
+            hex   32323300
+            hex   33333200
+            hex   23311200
+
+            hex   000fffff
+            hex   0000ffff
+            hex   0000f0ff
+            hex   0000f0ff
+            hex   000000ff
+            hex   000000ff
+            hex   000000ff
+            hex   000000ff
+
+            hex   00000111
+            hex   00001111
+            hex   00301222
+            hex   00302222
+            hex   00332313
+            hex   00332323
+            hex   00233333
+            hex   00211332
+
+            hex   fffff000
+            hex   ffff0000
+            hex   ff0f0000
+            hex   ff0f0000
+            hex   ff000000
+            hex   ff000000
+            hex   ff000000
+            hex   ff000000
+
+; Tile ID 3
+; From image coordinates 16, 0
+            hex   00000111
+            hex   00001111
+            hex   00301222
+            hex   00302222
+            hex   00332313
+            hex   00332323
+            hex   00033333
+            hex   00001332
+
+            hex   fffff000
+            hex   ffff0000
+            hex   ff0f0000
+            hex   ff0f0000
+            hex   ff000000
+            hex   ff000000
+            hex   fff00000
+            hex   ffff0000
+
+            hex   11100000
+            hex   11110000
+            hex   22210300
+            hex   22220300
+            hex   31323300
+            hex   32323300
+            hex   33333000
+            hex   23310000
+
+            hex   000fffff
+            hex   0000ffff
+            hex   0000f0ff
+            hex   0000f0ff
+            hex   000000ff
+            hex   000000ff
+            hex   00000fff
+            hex   0000ffff
+
+; Tile ID 4
+; From image coordinates 24, 0
+            hex   11100000
+            hex   11110000
+            hex   22210300
+            hex   22220300
+            hex   31323300
+            hex   32323300
+            hex   33333200
+            hex   23312200
+
+            hex   000fffff
+            hex   0000ffff
+            hex   0000f0ff
+            hex   0000f0ff
+            hex   000000ff
+            hex   000000ff
+            hex   000000ff
+            hex   000000ff
+
+            hex   00000111
+            hex   00001111
+            hex   00301222
+            hex   00302222
+            hex   00332313
+            hex   00332323
+            hex   00233333
+            hex   00221332
+
+            hex   fffff000
+            hex   ffff0000
+            hex   ff0f0000
+            hex   ff0f0000
+            hex   ff000000
+            hex   ff000000
+            hex   ff000000
+            hex   ff000000
+
+; Tile ID 5
+; From image coordinates 32, 0
+            hex   00000111
+            hex   00011111
+            hex   01113112
+            hex   11113322
+            hex   10113332
+            hex   00122332
+            hex   00022233
+            hex   00001111
+
+            hex   fffff000
+            hex   fff00000
+            hex   f0000000
+            hex   00000000
+            hex   0f000000
+            hex   ff000000
+            hex   fff00000
+            hex   ffff0000
+
+            hex   11100000
+            hex   11111000
+            hex   21131110
+            hex   22331111
+            hex   23331101
+            hex   23322100
+            hex   33222000
+            hex   11110000
+
+            hex   000fffff
+            hex   00000fff
+            hex   0000000f
+            hex   00000000
+            hex   000000f0
+            hex   000000ff
+            hex   00000fff
+            hex   0000ffff
+
+; Tile ID 6
+; From image coordinates 40, 0
+            hex   10000000
+            hex   22220000
+            hex   22222000
+            hex   22220000
+            hex   33130020
+            hex   33233320
+            hex   33330020
+            hex   33330020
+
+            hex   0fffffff
+            hex   0000ffff
+            hex   00000fff
+            hex   0000ffff
+            hex   0000ff0f
+            hex   0000000f
+            hex   0000ff0f
+            hex   0000ff0f
+
+            hex   00000001
+            hex   00002222
+            hex   00022222
+            hex   00002222
+            hex   02003133
+            hex   02333233
+            hex   02003333
+            hex   02003333
+
+            hex   fffffff0
+            hex   ffff0000
+            hex   fff00000
+            hex   ffff0000
+            hex   f0ff0000
+            hex   f0000000
+            hex   f0ff0000
+            hex   f0ff0000
+
+; Tile ID 7
+; From image coordinates 48, 0
+            hex   00000000
+            hex   00000111
+            hex   00011111
+            hex   01113112
+            hex   11113322
+            hex   10113332
+            hex   00122332
+            hex   00022233
+
+            hex   ffffffff
+            hex   fffff000
+            hex   fff00000
+            hex   f0000000
+            hex   00000000
+            hex   0f000000
+            hex   ff000000
+            hex   fff00000
+
+            hex   00000000
+            hex   11100000
+            hex   11111000
+            hex   21131110
+            hex   22331111
+            hex   23331101
+            hex   23322100
+            hex   33222000
+
+            hex   ffffffff
+            hex   000fffff
+            hex   00000fff
+            hex   0000000f
+            hex   00000000
+            hex   000000f0
+            hex   000000ff
+            hex   00000fff
+
+; Tile ID 8
+; From image coordinates 56, 0
+            hex   00000000
+            hex   10000000
+            hex   22220000
+            hex   22222000
+            hex   22220000
+            hex   33130000
+            hex   33233300
+            hex   33330200
+
+            hex   ffffffff
+            hex   0fffffff
+            hex   0000ffff
+            hex   00000fff
+            hex   0000ffff
+            hex   0000ffff
+            hex   000000ff
+            hex   0000f0ff
+
+            hex   00000000
+            hex   00000001
+            hex   00002222
+            hex   00022222
+            hex   00002222
+            hex   00003133
+            hex   00333233
+            hex   00203333
+
+            hex   ffffffff
+            hex   fffffff0
+            hex   ffff0000
+            hex   fff00000
+            hex   ffff0000
+            hex   ffff0000
+            hex   ff000000
+            hex   ff0f0000
+
+; Tile ID 9
+; From image coordinates 64, 0
+            hex   00000111
+            hex   00001111
+            hex   00301111
+            hex   00311111
+            hex   00321111
+            hex   00332211
+            hex   00032221
+            hex   00021222
+
+            hex   fffff000
+            hex   ffff0000
+            hex   ff0f0000
+            hex   ff000000
+            hex   ff000000
+            hex   ff000000
+            hex   fff00000
+            hex   fff00000
+
+            hex   11100000
+            hex   11110000
+            hex   11110300
+            hex   11111300
+            hex   11112300
+            hex   11223300
+            hex   12223000
+            hex   22212000
+
+            hex   000fffff
+            hex   0000ffff
+            hex   0000f0ff
+            hex   000000ff
+            hex   000000ff
+            hex   000000ff
+            hex   00000fff
+            hex   00000fff
+
+; Tile ID 10
+; From image coordinates 72, 0
+            hex   11100000
+            hex   11110000
+            hex   11110300
+            hex   11111300
+            hex   11112300
+            hex   11223300
+            hex   12223000
+            hex   22212000
+
+            hex   000fffff
+            hex   0000ffff
+            hex   0000f0ff
+            hex   000000ff
+            hex   000000ff
+            hex   000000ff
+            hex   00000fff
+            hex   00000fff
+
+            hex   00000111
+            hex   00001111
+            hex   00301111
+            hex   00311111
+            hex   00321111
+            hex   00332211
+            hex   00032221
+            hex   00021222
+
+            hex   fffff000
+            hex   ffff0000
+            hex   ff0f0000
+            hex   ff000000
+            hex   ff000000
+            hex   ff000000
+            hex   fff00000
+            hex   fff00000
+
+; Tile ID 11
+; From image coordinates 80, 0
+            hex   00000111
+            hex   00001111
+            hex   00301111
+            hex   00311111
+            hex   00321111
+            hex   00332211
+            hex   00032221
+            hex   00021222
+
+            hex   fffff000
+            hex   ffff0000
+            hex   ff0f0000
+            hex   ff000000
+            hex   ff000000
+            hex   ff000000
+            hex   fff00000
+            hex   fff00000
+
+            hex   11100000
+            hex   11110000
+            hex   11110300
+            hex   11111300
+            hex   11112300
+            hex   11223300
+            hex   12223000
+            hex   22212000
+
+            hex   000fffff
+            hex   0000ffff
+            hex   0000f0ff
+            hex   000000ff
+            hex   000000ff
+            hex   000000ff
+            hex   00000fff
+            hex   00000fff
+
+; Tile ID 12
+; From image coordinates 88, 0
+            hex   11100000
+            hex   11110000
+            hex   11110300
+            hex   11111300
+            hex   11112300
+            hex   11223300
+            hex   12223000
+            hex   22212000
+
+            hex   000fffff
+            hex   0000ffff
+            hex   0000f0ff
+            hex   000000ff
+            hex   000000ff
+            hex   000000ff
+            hex   00000fff
+            hex   00000fff
+
+            hex   00000111
+            hex   00001111
+            hex   00301111
+            hex   00311111
+            hex   00321111
+            hex   00332211
+            hex   00032221
+            hex   00021222
+
+            hex   fffff000
+            hex   ffff0000
+            hex   ff0f0000
+            hex   ff000000
+            hex   ff000000
+            hex   ff000000
+            hex   fff00000
+            hex   fff00000
+
+; Tile ID 13
+; From image coordinates 96, 0
+            hex   00022011
+            hex   00232111
+            hex   02231122
+            hex   22331222
+            hex   22332313
+            hex   32232323
+            hex   03221332
+            hex   00321132
+
+            hex   fff00f00
+            hex   ff000000
+            hex   f0000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   f0000000
+            hex   ff000000
+
+            hex   11022000
+            hex   11123200
+            hex   22113220
+            hex   22213322
+            hex   31323322
+            hex   32323223
+            hex   23312230
+            hex   23112300
+
+            hex   00f00fff
+            hex   000000ff
+            hex   0000000f
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   0000000f
+            hex   000000ff
+
+; Tile ID 14
+; From image coordinates 104, 0
+            hex   11100000
+            hex   11110000
+            hex   22111000
+            hex   22211030
+            hex   31221330
+            hex   32321300
+            hex   23333000
+            hex   23322000
+
+            hex   000fffff
+            hex   0000ffff
+            hex   00000fff
+            hex   00000f0f
+            hex   0000000f
+            hex   000000ff
+            hex   00000fff
+            hex   00000fff
+
+            hex   00000111
+            hex   00001111
+            hex   00011122
+            hex   03011222
+            hex   03312213
+            hex   00312323
+            hex   00033332
+            hex   00022332
+
+            hex   fffff000
+            hex   ffff0000
+            hex   fff00000
+            hex   f0f00000
+            hex   f0000000
+            hex   ff000000
+            hex   fff00000
+            hex   fff00000
+
+; Tile ID 15
+; From image coordinates 112, 0
+            hex   00000000
+            hex   00000011
+            hex   00001111
+            hex   00011311
+            hex   00011332
+            hex   00111333
+            hex   01112233
+            hex   01002223
+
+            hex   ffffffff
+            hex   ffffff00
+            hex   ffff0000
+            hex   fff00000
+            hex   fff00000
+            hex   ff000000
+            hex   f0000000
+            hex   f0ff0000
+
+            hex   00000000
+            hex   11000000
+            hex   11110000
+            hex   11311000
+            hex   23311000
+            hex   33311100
+            hex   33221110
+            hex   32220010
+
+            hex   ffffffff
+            hex   00ffffff
+            hex   0000ffff
+            hex   00000fff
+            hex   00000fff
+            hex   000000ff
+            hex   0000000f
+            hex   0000ff0f
+
+; Tile ID 16
+; From image coordinates 120, 0
+            hex   00000000
+            hex   11000000
+            hex   12222000
+            hex   22222200
+            hex   22222000
+            hex   23313000
+            hex   23323330
+            hex   33333000
+
+            hex   ffffffff
+            hex   00ffffff
+            hex   00000fff
+            hex   000000ff
+            hex   00000fff
+            hex   00000fff
+            hex   0000000f
+            hex   00000fff
+
+            hex   00000000
+            hex   00000011
+            hex   00022221
+            hex   00222222
+            hex   00022222
+            hex   00031332
+            hex   03332332
+            hex   00033333
+
+            hex   ffffffff
+            hex   ffffff00
+            hex   fff00000
+            hex   ff000000
+            hex   fff00000
+            hex   fff00000
+            hex   f0000000
+            hex   fff00000
+
+; Tile ID 17
+; From image coordinates 128, 0
+            hex   00021111
+            hex   03011111
+            hex   03211111
+            hex   03311111
+            hex   02321111
+            hex   02322111
+            hex   02212212
+            hex   02211222
+
+            hex   fff00000
+            hex   f0f00000
+            hex   f0000000
+            hex   f0000000
+            hex   f0000000
+            hex   f0000000
+            hex   f0000000
+            hex   f0000000
+
+            hex   11112000
+            hex   11111030
+            hex   11111230
+            hex   11111330
+            hex   11112320
+            hex   11122320
+            hex   21221220
+            hex   22211220
+
+            hex   00000fff
+            hex   00000f0f
+            hex   0000000f
+            hex   0000000f
+            hex   0000000f
+            hex   0000000f
+            hex   0000000f
+            hex   0000000f
+
+; Tile ID 18
+; From image coordinates 136, 0
+            hex   10000000
+            hex   11000000
+            hex   11100000
+            hex   11103000
+            hex   11233000
+            hex   22230003
+            hex   22130032
+            hex   21222322
+
+            hex   0fffffff
+            hex   00ffffff
+            hex   000fffff
+            hex   000f0fff
+            hex   00000fff
+            hex   0000fff0
+            hex   0000ff00
+            hex   00000000
+
+            hex   00000001
+            hex   00000011
+            hex   00000111
+            hex   00030111
+            hex   00033211
+            hex   30003222
+            hex   23003122
+            hex   22322212
+
+            hex   fffffff0
+            hex   ffffff00
+            hex   fffff000
+            hex   fff0f000
+            hex   fff00000
+            hex   0fff0000
+            hex   00ff0000
+            hex   00000000
+
+; Tile ID 19
+; From image coordinates 144, 0
+            hex   00222000
+            hex   00222000
+            hex   00222000
+            hex   00222000
+            hex   00222000
+            hex   00222000
+            hex   00222000
+            hex   00222000
+
+            hex   ff000fff
+            hex   ff000fff
+            hex   ff000fff
+            hex   ff000fff
+            hex   ff000fff
+            hex   ff000fff
+            hex   ff000fff
+            hex   ff000fff
+
+            hex   00022200
+            hex   00022200
+            hex   00022200
+            hex   00022200
+            hex   00022200
+            hex   00022200
+            hex   00022200
+            hex   00022200
+
+            hex   fff000ff
+            hex   fff000ff
+            hex   fff000ff
+            hex   fff000ff
+            hex   fff000ff
+            hex   fff000ff
+            hex   fff000ff
+            hex   fff000ff
+
+; Tile ID 20
+; From image coordinates 152, 0
+            hex   00222000
+            hex   00222000
+            hex   00222000
+            hex   00222000
+            hex   00222000
+            hex   00222000
+            hex   00020000
+            hex   00000000
+
+            hex   ff000fff
+            hex   ff000fff
+            hex   ff000fff
+            hex   ff000fff
+            hex   ff000fff
+            hex   ff000fff
+            hex   fff0ffff
+            hex   ffffffff
+
+            hex   00022200
+            hex   00022200
+            hex   00022200
+            hex   00022200
+            hex   00022200
+            hex   00022200
+            hex   00002000
+            hex   00000000
+
+            hex   fff000ff
+            hex   fff000ff
+            hex   fff000ff
+            hex   fff000ff
+            hex   fff000ff
+            hex   fff000ff
+            hex   ffff0fff
+            hex   ffffffff
+
+; Tile ID 21
+; From image coordinates 160, 0
+            hex   33100000
+            hex   00100000
+            hex   33122222
+            hex   33122222
+            hex   13122222
+            hex   00100000
+            hex   01100000
+            hex   00000000
+
+            hex   000fffff
+            hex   ff0fffff
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   ff0fffff
+            hex   f00fffff
+            hex   ffffffff
+
+            hex   00000133
+            hex   00000100
+            hex   22222133
+            hex   22222133
+            hex   22222131
+            hex   00000100
+            hex   00000110
+            hex   00000000
+
+            hex   fffff000
+            hex   fffff0ff
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   fffff0ff
+            hex   fffff00f
+            hex   ffffffff
+
+; Tile ID 22
+; From image coordinates 168, 0
+            hex   00000000
+            hex   00000000
+            hex   22222000
+            hex   22222200
+            hex   22222000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+
+            hex   ffffffff
+            hex   ffffffff
+            hex   00000fff
+            hex   000000ff
+            hex   00000fff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+
+            hex   00000000
+            hex   00000000
+            hex   00022222
+            hex   00222222
+            hex   00022222
+            hex   00000000
+            hex   00000000
+            hex   00000000
+
+            hex   ffffffff
+            hex   ffffffff
+            hex   fff00000
+            hex   ff000000
+            hex   fff00000
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+
+; Tile ID 23
+; From image coordinates 176, 0
+            hex   33000000
+            hex   42000000
+            hex   22222222
+            hex   32222222
+            hex   32222222
+            hex   42000000
+            hex   42000000
+            hex   42000000
+
+            hex   00ffffff
+            hex   00ffffff
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00ffffff
+            hex   00ffffff
+            hex   00ffffff
+
+            hex   00000033
+            hex   00000024
+            hex   22222222
+            hex   22222223
+            hex   22222223
+            hex   00000024
+            hex   00000024
+            hex   00000024
+
+            hex   ffffff00
+            hex   ffffff00
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   ffffff00
+            hex   ffffff00
+            hex   ffffff00
+
+; Tile ID 24
+; From image coordinates 184, 0
+            hex   00000000
+            hex   00000000
+            hex   22000000
+            hex   22200000
+            hex   22000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+
+            hex   ffffffff
+            hex   ffffffff
+            hex   00ffffff
+            hex   000fffff
+            hex   00ffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+
+            hex   00000000
+            hex   00000000
+            hex   00000022
+            hex   00000222
+            hex   00000022
+            hex   00000000
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+            hex   00000000
+
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffff00
+            hex   fffff000
+            hex   ffffff00
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+
+; Tile ID 25
+; From image coordinates 192, 0
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
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+
+            hex   00000000
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+            hex   00000000
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+
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+
+; Tile ID 26
+; From image coordinates 200, 0
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
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+            hex   ffffffff
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+            hex   ffffffff
+
+            hex   00000000
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+            hex   00000000
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+
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+
+; Tile ID 27
+; From image coordinates 208, 0
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
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+            hex   ffffffff
+
+            hex   00000000
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+            hex   00000000
+            hex   00000000
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+
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+
+; Tile ID 28
+; From image coordinates 216, 0
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
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+            hex   ffffffff
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+            hex   ffffffff
+
+            hex   00000000
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+
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+
+; Tile ID 29
+; From image coordinates 224, 0
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+
+; Tile ID 30
+; From image coordinates 232, 0
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+
+; Tile ID 31
+; From image coordinates 240, 0
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+
+; Tile ID 32
+; From image coordinates 248, 0
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+
+; Tile ID 33
+; From image coordinates 0, 8
+            hex   02222233
+            hex   22322221
+            hex   23332232
+            hex   22322231
+            hex   22322232
+            hex   22222231
+            hex   03333320
+            hex   00002220
+
+            hex   f0000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   f000000f
+            hex   ffff000f
+
+            hex   33222220
+            hex   12222322
+            hex   23223332
+            hex   13222322
+            hex   23222322
+            hex   13222222
+            hex   02333330
+            hex   02220000
+
+            hex   0000000f
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   f000000f
+            hex   f000ffff
+
+; Tile ID 34
+; From image coordinates 8, 8
+            hex   33112220
+            hex   11113220
+            hex   21133320
+            hex   22223330
+            hex   21111300
+            hex   11110000
+            hex   02220000
+            hex   00000000
+
+            hex   0000000f
+            hex   0000000f
+            hex   0000000f
+            hex   0000000f
+            hex   000000ff
+            hex   0000ffff
+            hex   f000ffff
+            hex   ffffffff
+
+            hex   02221133
+            hex   02231111
+            hex   02333112
+            hex   03332222
+            hex   00311112
+            hex   00001111
+            hex   00002220
+            hex   00000000
+
+            hex   f0000000
+            hex   f0000000
+            hex   f0000000
+            hex   f0000000
+            hex   ff000000
+            hex   ffff0000
+            hex   ffff000f
+            hex   ffffffff
+
+; Tile ID 35
+; From image coordinates 16, 8
+            hex   00222223
+            hex   02232222
+            hex   02333223
+            hex   02232223
+            hex   02232223
+            hex   02222223
+            hex   00333330
+            hex   00000000
+
+            hex   ff000000
+            hex   f0000000
+            hex   f0000000
+            hex   f0000000
+            hex   f0000000
+            hex   f0000000
+            hex   ff00000f
+            hex   ffffffff
+
+            hex   32222200
+            hex   22223220
+            hex   32233320
+            hex   32223220
+            hex   32223220
+            hex   32222220
+            hex   03333300
+            hex   00000000
+
+            hex   000000ff
+            hex   0000000f
+            hex   0000000f
+            hex   0000000f
+            hex   0000000f
+            hex   0000000f
+            hex   f00000ff
+            hex   ffffffff
+
+; Tile ID 36
+; From image coordinates 24, 8
+            hex   33111300
+            hex   11111300
+            hex   22112000
+            hex   12221000
+            hex   22111000
+            hex   11120000
+            hex   02220000
+            hex   02220000
+
+            hex   000000ff
+            hex   000000ff
+            hex   00000fff
+            hex   00000fff
+            hex   00000fff
+            hex   0000ffff
+            hex   f000ffff
+            hex   f000ffff
+
+            hex   00311133
+            hex   00311111
+            hex   00021122
+            hex   00012221
+            hex   00011122
+            hex   00002111
+            hex   00002220
+            hex   00002220
+
+            hex   ff000000
+            hex   ff000000
+            hex   fff00000
+            hex   fff00000
+            hex   fff00000
+            hex   ffff0000
+            hex   ffff000f
+            hex   ffff000f
+
+; Tile ID 37
+; From image coordinates 32, 8
+            hex   00211111
+            hex   02221333
+            hex   02222333
+            hex   02222331
+            hex   00122112
+            hex   01111111
+            hex   00002222
+            hex   00002222
+
+            hex   ff000000
+            hex   f0000000
+            hex   f0000000
+            hex   f0000000
+            hex   ff000000
+            hex   f0000000
+            hex   ffff0000
+            hex   ffff0000
+
+            hex   11111200
+            hex   33312220
+            hex   33322220
+            hex   13322220
+            hex   21122100
+            hex   11111110
+            hex   22220000
+            hex   22220000
+
+            hex   000000ff
+            hex   0000000f
+            hex   0000000f
+            hex   0000000f
+            hex   000000ff
+            hex   0000000f
+            hex   0000ffff
+            hex   0000ffff
+
+; Tile ID 38
+; From image coordinates 40, 8
+            hex   11222320
+            hex   11122320
+            hex   11122020
+            hex   11200020
+            hex   22200020
+            hex   11100000
+            hex   00000000
+            hex   20000000
+
+            hex   0000000f
+            hex   0000000f
+            hex   00000f0f
+            hex   000fff0f
+            hex   000fff0f
+            hex   000fffff
+            hex   ffffffff
+            hex   0fffffff
+
+            hex   02322211
+            hex   02322111
+            hex   02022111
+            hex   02000211
+            hex   02000222
+            hex   00000111
+            hex   00000000
+            hex   00000002
+
+            hex   f0000000
+            hex   f0000000
+            hex   f0f00000
+            hex   f0fff000
+            hex   f0fff000
+            hex   fffff000
+            hex   ffffffff
+            hex   fffffff0
+
+; Tile ID 39
+; From image coordinates 48, 8
+            hex   00001111
+            hex   00122113
+            hex   00222223
+            hex   01222223
+            hex   01122221
+            hex   22111112
+            hex   22211111
+            hex   02220000
+
+            hex   ffff0000
+            hex   ff000000
+            hex   ff000000
+            hex   f0000000
+            hex   f0000000
+            hex   00000000
+            hex   00000000
+            hex   f000ffff
+
+            hex   11110000
+            hex   31122100
+            hex   32222200
+            hex   32222210
+            hex   12222110
+            hex   21111122
+            hex   11111222
+            hex   00002220
+
+            hex   0000ffff
+            hex   000000ff
+            hex   000000ff
+            hex   0000000f
+            hex   0000000f
+            hex   00000000
+            hex   00000000
+            hex   ffff000f
+
+; Tile ID 40
+; From image coordinates 56, 8
+            hex   33330200
+            hex   33223200
+            hex   33123200
+            hex   31120200
+            hex   11200200
+            hex   22210200
+            hex   11122000
+            hex   02220000
+
+            hex   0000f0ff
+            hex   000000ff
+            hex   000000ff
+            hex   0000f0ff
+            hex   000ff0ff
+            hex   0000f0ff
+            hex   00000fff
+            hex   f000ffff
+
+            hex   00203333
+            hex   00232233
+            hex   00232133
+            hex   00202113
+            hex   00200211
+            hex   00201222
+            hex   00022111
+            hex   00002220
+
+            hex   ff0f0000
+            hex   ff000000
+            hex   ff000000
+            hex   ff0f0000
+            hex   ff0ff000
+            hex   ff0f0000
+            hex   fff00000
+            hex   ffff000f
+
+; Tile ID 41
+; From image coordinates 64, 8
+            hex   00221111
+            hex   00221111
+            hex   00022111
+            hex   00011222
+            hex   00011111
+            hex   00022211
+            hex   00022220
+            hex   00002200
+
+            hex   ff000000
+            hex   ff000000
+            hex   fff00000
+            hex   fff00000
+            hex   fff00000
+            hex   fff00000
+            hex   fff0000f
+            hex   ffff00ff
+
+            hex   11112200
+            hex   11112200
+            hex   11122000
+            hex   22211000
+            hex   11111000
+            hex   11222000
+            hex   02222000
+            hex   00220000
+
+            hex   000000ff
+            hex   000000ff
+            hex   00000fff
+            hex   00000fff
+            hex   00000fff
+            hex   00000fff
+            hex   f0000fff
+            hex   ff00ffff
+
+; Tile ID 42
+; From image coordinates 72, 8
+            hex   11122000
+            hex   11122300
+            hex   11122300
+            hex   22213300
+            hex   11111000
+            hex   11120000
+            hex   02200000
+            hex   00000000
+
+            hex   00000fff
+            hex   000000ff
+            hex   000000ff
+            hex   000000ff
+            hex   00000fff
+            hex   0000ffff
+            hex   f00fffff
+            hex   ffffffff
+
+            hex   00022111
+            hex   00322111
+            hex   00322111
+            hex   00331222
+            hex   00011111
+            hex   00002111
+            hex   00000220
+            hex   00000000
+
+            hex   fff00000
+            hex   ff000000
+            hex   ff000000
+            hex   ff000000
+            hex   fff00000
+            hex   ffff0000
+            hex   fffff00f
+            hex   ffffffff
+
+; Tile ID 43
+; From image coordinates 80, 8
+            hex   00022111
+            hex   00322111
+            hex   00322111
+            hex   00331222
+            hex   00011111
+            hex   00002111
+            hex   00000220
+            hex   00000000
+
+            hex   fff00000
+            hex   ff000000
+            hex   ff000000
+            hex   ff000000
+            hex   fff00000
+            hex   ffff0000
+            hex   fffff00f
+            hex   ffffffff
+
+            hex   11122000
+            hex   11122300
+            hex   11122300
+            hex   22213300
+            hex   11111000
+            hex   11120000
+            hex   02200000
+            hex   00000000
+
+            hex   00000fff
+            hex   000000ff
+            hex   000000ff
+            hex   000000ff
+            hex   00000fff
+            hex   0000ffff
+            hex   f00fffff
+            hex   ffffffff
+
+; Tile ID 44
+; From image coordinates 88, 8
+            hex   11112200
+            hex   11112200
+            hex   11122000
+            hex   22211000
+            hex   11111000
+            hex   11222000
+            hex   02222000
+            hex   00220000
+
+            hex   000000ff
+            hex   000000ff
+            hex   00000fff
+            hex   00000fff
+            hex   00000fff
+            hex   00000fff
+            hex   f0000fff
+            hex   ff00ffff
+
+            hex   00221111
+            hex   00221111
+            hex   00022111
+            hex   00011222
+            hex   00011111
+            hex   00022211
+            hex   00022220
+            hex   00002200
+
+            hex   ff000000
+            hex   ff000000
+            hex   fff00000
+            hex   fff00000
+            hex   fff00000
+            hex   fff00000
+            hex   fff0000f
+            hex   ffff00ff
+
+; Tile ID 45
+; From image coordinates 96, 8
+            hex   00031113
+            hex   00002111
+            hex   00001212
+            hex   00001122
+            hex   00022112
+            hex   00222011
+            hex   00000000
+            hex   00000000
+
+            hex   fff00000
+            hex   ffff0000
+            hex   ffff0000
+            hex   ffff0000
+            hex   fff00000
+            hex   ff000f00
+            hex   ffffffff
+            hex   ffffffff
+
+            hex   31113000
+            hex   11120000
+            hex   21210000
+            hex   22110000
+            hex   21122000
+            hex   11022200
+            hex   00000000
+            hex   00000000
+
+            hex   00000fff
+            hex   0000ffff
+            hex   0000ffff
+            hex   0000ffff
+            hex   00000fff
+            hex   00f000ff
+            hex   ffffffff
+            hex   ffffffff
+
+; Tile ID 46
+; From image coordinates 104, 8
+            hex   33222200
+            hex   11222200
+            hex   22222100
+            hex   12221100
+            hex   23321120
+            hex   33311222
+            hex   33302222
+            hex   00000000
+
+            hex   000000ff
+            hex   000000ff
+            hex   000000ff
+            hex   000000ff
+            hex   0000000f
+            hex   00000000
+            hex   000f0000
+            hex   ffffffff
+
+            hex   00222233
+            hex   00222211
+            hex   00122222
+            hex   00112221
+            hex   02112332
+            hex   22211333
+            hex   22220333
+            hex   00000000
+
+            hex   ff000000
+            hex   ff000000
+            hex   ff000000
+            hex   ff000000
+            hex   f0000000
+            hex   00000000
+            hex   0000f000
+            hex   ffffffff
+
+; Tile ID 47
+; From image coordinates 112, 8
+            hex   00001111
+            hex   00011222
+            hex   00012222
+            hex   00112222
+            hex   01111222
+            hex   22111111
+            hex   22211111
+            hex   02220000
+
+            hex   ffff0000
+            hex   fff00000
+            hex   fff00000
+            hex   ff000000
+            hex   f0000000
+            hex   00000000
+            hex   00000000
+            hex   f000ffff
+
+            hex   11110000
+            hex   22211000
+            hex   22221000
+            hex   22221100
+            hex   22211110
+            hex   11111122
+            hex   11111222
+            hex   00002220
+
+            hex   0000ffff
+            hex   00000fff
+            hex   00000fff
+            hex   000000ff
+            hex   0000000f
+            hex   00000000
+            hex   00000000
+            hex   ffff000f
+
+; Tile ID 48
+; From image coordinates 120, 8
+            hex   13333300
+            hex   22233300
+            hex   22233000
+            hex   22210000
+            hex   11122000
+            hex   22222000
+            hex   11112200
+            hex   00022220
+
+            hex   000000ff
+            hex   000000ff
+            hex   00000fff
+            hex   0000ffff
+            hex   00000fff
+            hex   00000fff
+            hex   000000ff
+            hex   fff0000f
+
+            hex   00333331
+            hex   00333222
+            hex   00033222
+            hex   00001222
+            hex   00022111
+            hex   00022222
+            hex   00221111
+            hex   02222000
+
+            hex   ff000000
+            hex   ff000000
+            hex   fff00000
+            hex   ffff0000
+            hex   fff00000
+            hex   fff00000
+            hex   ff000000
+            hex   f0000fff
+
+; Tile ID 49
+; From image coordinates 128, 8
+            hex   00211111
+            hex   00211111
+            hex   00121111
+            hex   02112222
+            hex   22111111
+            hex   22200001
+            hex   00000000
+            hex   00000000
+
+            hex   ff000000
+            hex   ff000000
+            hex   ff000000
+            hex   f0000000
+            hex   00000000
+            hex   000ffff0
+            hex   ffffffff
+            hex   ffffffff
+
+            hex   11111200
+            hex   11111200
+            hex   11112100
+            hex   22221120
+            hex   11111122
+            hex   10000222
+            hex   00000000
+            hex   00000000
+
+            hex   000000ff
+            hex   000000ff
+            hex   000000ff
+            hex   0000000f
+            hex   00000000
+            hex   0ffff000
+            hex   ffffffff
+            hex   ffffffff
+
+; Tile ID 50
+; From image coordinates 136, 8
+            hex   11223222
+            hex   11232222
+            hex   11322220
+            hex   22232200
+            hex   11113000
+            hex   11122000
+            hex   00222200
+            hex   00222200
+
+            hex   00000000
+            hex   00000000
+            hex   0000000f
+            hex   000000ff
+            hex   00000fff
+            hex   00000fff
+            hex   ff0000ff
+            hex   ff0000ff
+
+            hex   22232211
+            hex   22223211
+            hex   02222311
+            hex   00223222
+            hex   00031111
+            hex   00022111
+            hex   00222200
+            hex   00222200
+
+            hex   00000000
+            hex   00000000
+            hex   f0000000
+            hex   ff000000
+            hex   fff00000
+            hex   fff00000
+            hex   ff0000ff
+            hex   ff0000ff
+
+; Tile ID 51
+; From image coordinates 144, 8
+            hex   00222000
+            hex   00222000
+            hex   00020000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+
+            hex   ff000fff
+            hex   ff000fff
+            hex   fff0ffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+
+            hex   00022200
+            hex   00022200
+            hex   00002000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+
+            hex   fff000ff
+            hex   fff000ff
+            hex   ffff0fff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+
+; Tile ID 52
+; From image coordinates 152, 8
+            hex   33200000
+            hex   00200000
+            hex   00200000
+            hex   23222200
+            hex   23222220
+            hex   22222200
+            hex   00200000
+            hex   00200000
+
+            hex   000fffff
+            hex   ff0fffff
+            hex   ff0fffff
+            hex   000000ff
+            hex   0000000f
+            hex   000000ff
+            hex   ff0fffff
+            hex   ff0fffff
+
+            hex   00000233
+            hex   00000200
+            hex   00000200
+            hex   00222232
+            hex   02222232
+            hex   00222222
+            hex   00000200
+            hex   00000200
+
+            hex   fffff000
+            hex   fffff0ff
+            hex   fffff0ff
+            hex   ff000000
+            hex   f0000000
+            hex   ff000000
+            hex   fffff0ff
+            hex   fffff0ff
+
+; Tile ID 53
+; From image coordinates 160, 8
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+
+; Tile ID 54
+; From image coordinates 168, 8
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+
+; Tile ID 55
+; From image coordinates 176, 8
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+
+; Tile ID 56
+; From image coordinates 184, 8
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+
+; Tile ID 57
+; From image coordinates 192, 8
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+
+; Tile ID 58
+; From image coordinates 200, 8
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+
+; Tile ID 59
+; From image coordinates 208, 8
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+
+; Tile ID 60
+; From image coordinates 216, 8
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+
+; Tile ID 61
+; From image coordinates 224, 8
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+
+; Tile ID 62
+; From image coordinates 232, 8
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+
+; Tile ID 63
+; From image coordinates 240, 8
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+
+; Tile ID 64
+; From image coordinates 248, 8
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+
+; Tile ID 65
+; From image coordinates 0, 16
+            hex   00000000
+            hex   00006567
+            hex   00656666
+            hex   00667666
+            hex   06666666
+            hex   06666676
+            hex   66666666
+            hex   66766666
+
+            hex   ffffffff
+            hex   ffff0000
+            hex   ff000000
+            hex   f0000000
+            hex   f0000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+
+            hex   00000000
+            hex   76560000
+            hex   66665600
+            hex   66676600
+            hex   66666660
+            hex   67666660
+            hex   66666666
+            hex   66666766
+
+            hex   ffffffff
+            hex   0000ffff
+            hex   000000ff
+            hex   000000ff
+            hex   0000000f
+            hex   0000000f
+            hex   00000000
+            hex   00000000
+
+; Tile ID 66
+; From image coordinates 8, 16
+            hex   00000000
+            hex   77000000
+            hex   67777000
+            hex   66776700
+            hex   66677700
+            hex   66767770
+            hex   66777700
+            hex   66677770
+
+            hex   ffffffff
+            hex   00ffffff
+            hex   00000fff
+            hex   000000ff
+            hex   000000ff
+            hex   0000000f
+            hex   000000ff
+            hex   0000000f
+
+            hex   00000000
+            hex   00000077
+            hex   00077776
+            hex   00767766
+            hex   00777666
+            hex   07776766
+            hex   00777766
+            hex   07777666
+
+            hex   ffffffff
+            hex   ffffff00
+            hex   fff00000
+            hex   ff000000
+            hex   ff000000
+            hex   f0000000
+            hex   ff000000
+            hex   f0000000
+
+; Tile ID 67
+; From image coordinates 16, 16
+            hex   55667555
+            hex   56666755
+            hex   56566776
+            hex   65666756
+            hex   65666756
+            hex   65667566
+            hex   66667566
+            hex   66667566
+
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+
+            hex   55576655
+            hex   55766665
+            hex   67766565
+            hex   65766656
+            hex   65766656
+            hex   66576656
+            hex   66576666
+            hex   66576666
+
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+
+; Tile ID 68
+; From image coordinates 24, 16
+            hex   55555555
+            hex   55555555
+            hex   66775555
+            hex   66667555
+            hex   66667755
+            hex   66666755
+            hex   76666775
+            hex   76677775
+
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+
+            hex   55555555
+            hex   55555555
+            hex   55557766
+            hex   55576666
+            hex   55776666
+            hex   55766666
+            hex   57766667
+            hex   57777667
+
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+
+; Tile ID 69
+; From image coordinates 32, 16
+            hex   55555555
+            hex   55555555
+            hex   55555555
+            hex   55555555
+            hex   55555577
+            hex   55555567
+            hex   55555667
+            hex   55555667
+
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+
+            hex   55555555
+            hex   55555555
+            hex   55555555
+            hex   55555555
+            hex   77555555
+            hex   76555555
+            hex   76655555
+            hex   76655555
+
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+
+; Tile ID 70
+; From image coordinates 40, 16
+            hex   55667755
+            hex   56666775
+            hex   66666675
+            hex   56666677
+            hex   56666677
+            hex   56666777
+            hex   56666677
+            hex   76666675
+
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+
+            hex   55776655
+            hex   57766665
+            hex   57666666
+            hex   77666665
+            hex   77666665
+            hex   77766665
+            hex   77666665
+            hex   57666667
+
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+
+; Tile ID 71
+; From image coordinates 48, 16
+            hex   55555555
+            hex   55567555
+            hex   55666755
+            hex   56666675
+            hex   76666675
+            hex   56666667
+            hex   56666667
+            hex   56666677
+
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+
+            hex   55555555
+            hex   55576555
+            hex   55766655
+            hex   57666665
+            hex   57666667
+            hex   76666665
+            hex   76666665
+            hex   77666665
+
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+
+; Tile ID 72
+; From image coordinates 56, 16
+            hex   55555555
+            hex   55555555
+            hex   55555555
+            hex   55555555
+            hex   55555555
+            hex   55555555
+            hex   65555555
+            hex   66777555
+
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+
+            hex   55555555
+            hex   55555555
+            hex   55555555
+            hex   55555555
+            hex   55555555
+            hex   55555555
+            hex   55555556
+            hex   55577766
+
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+
+; Tile ID 73
+; From image coordinates 64, 16
+            hex   66665666
+            hex   66665666
+            hex   66675666
+            hex   66675666
+            hex   66675666
+            hex   66675666
+            hex   76775666
+            hex   57775666
+
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+
+            hex   66656666
+            hex   66656666
+            hex   66657666
+            hex   66657666
+            hex   66657666
+            hex   66657666
+            hex   66657767
+            hex   66657775
+
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+
+; Tile ID 74
+; From image coordinates 72, 16
+            hex   77756677
+            hex   66756667
+            hex   66756667
+            hex   66756666
+            hex   66756666
+            hex   66756666
+            hex   66775666
+            hex   66777566
+
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+
+            hex   77665777
+            hex   76665766
+            hex   76665766
+            hex   66665766
+            hex   66665766
+            hex   66665766
+            hex   66657766
+            hex   66577766
+
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+
+; Tile ID 75
+; From image coordinates 80, 16
+            hex   66675775
+            hex   66667756
+            hex   66667756
+            hex   56667756
+            hex   56667566
+            hex   66667566
+            hex   66667566
+            hex   66667566
+
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+
+            hex   57757666
+            hex   65776666
+            hex   65776666
+            hex   65776665
+            hex   66576665
+            hex   66576666
+            hex   66576666
+            hex   66576666
+
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+
+; Tile ID 76
+; From image coordinates 88, 16
+            hex   66775766
+            hex   66667775
+            hex   66667767
+            hex   66666767
+            hex   66666767
+            hex   66666667
+            hex   66655775
+            hex   66566675
+
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+
+            hex   66757766
+            hex   57776666
+            hex   76776666
+            hex   76766666
+            hex   76766666
+            hex   76666666
+            hex   57755666
+            hex   57666566
+
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+
+; Tile ID 77
+; From image coordinates 96, 16
+            hex   56666667
+            hex   56666666
+            hex   56776666
+            hex   55667666
+            hex   56667666
+            hex   56667666
+            hex   56667666
+            hex   56667666
+
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+
+            hex   76666665
+            hex   66666665
+            hex   66667765
+            hex   66676655
+            hex   66676665
+            hex   66676665
+            hex   66676665
+            hex   66676665
+
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+
+; Tile ID 78
+; From image coordinates 104, 16
+            hex   77566777
+            hex   77566677
+            hex   77566677
+            hex   77566675
+            hex   77566675
+            hex   77567755
+            hex   77775555
+            hex   77555555
+
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+
+            hex   77766577
+            hex   77666577
+            hex   77666577
+            hex   57666577
+            hex   57666577
+            hex   55776577
+            hex   55557777
+            hex   55555577
+
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+
+; Tile ID 79
+; From image coordinates 112, 16
+            hex   00000883
+            hex   00088388
+            hex   88888888
+            hex   08888838
+            hex   00883888
+            hex   88889988
+            hex   08899899
+            hex   00899889
+
+            hex   fffff000
+            hex   fff00000
+            hex   00000000
+            hex   f0000000
+            hex   ff000000
+            hex   00000000
+            hex   f0000000
+            hex   ff000000
+
+            hex   38800000
+            hex   88388000
+            hex   88888888
+            hex   83888880
+            hex   88838800
+            hex   88998888
+            hex   99899880
+            hex   98899800
+
+            hex   000fffff
+            hex   00000fff
+            hex   00000000
+            hex   0000000f
+            hex   000000ff
+            hex   00000000
+            hex   0000000f
+            hex   000000ff
+
+; Tile ID 80
+; From image coordinates 120, 16
+            hex   38800000
+            hex   88388000
+            hex   88888888
+            hex   83888880
+            hex   88838800
+            hex   88998888
+            hex   99899880
+            hex   98899800
+
+            hex   000fffff
+            hex   00000fff
+            hex   00000000
+            hex   0000000f
+            hex   000000ff
+            hex   00000000
+            hex   0000000f
+            hex   000000ff
+
+            hex   00000883
+            hex   00088388
+            hex   88888888
+            hex   08888838
+            hex   00883888
+            hex   88889988
+            hex   08899899
+            hex   00899889
+
+            hex   fffff000
+            hex   fff00000
+            hex   00000000
+            hex   f0000000
+            hex   ff000000
+            hex   00000000
+            hex   f0000000
+            hex   ff000000
+
+; Tile ID 81
+; From image coordinates 128, 16
+            hex   00000883
+            hex   88088388
+            hex   08838888
+            hex   00888838
+            hex   88883888
+            hex   08889988
+            hex   00899899
+            hex   08899889
+
+            hex   fffff000
+            hex   00f00000
+            hex   f0000000
+            hex   ff000000
+            hex   00000000
+            hex   f0000000
+            hex   ff000000
+            hex   f0000000
+
+            hex   38800000
+            hex   88388088
+            hex   88883880
+            hex   83888800
+            hex   88838888
+            hex   88998880
+            hex   99899800
+            hex   98899880
+
+            hex   000fffff
+            hex   00000f00
+            hex   0000000f
+            hex   000000ff
+            hex   00000000
+            hex   0000000f
+            hex   000000ff
+            hex   0000000f
+
+; Tile ID 82
+; From image coordinates 136, 16
+            hex   38800000
+            hex   88388088
+            hex   88883880
+            hex   83888800
+            hex   88838888
+            hex   88998880
+            hex   99899800
+            hex   98899880
+
+            hex   000fffff
+            hex   00000f00
+            hex   0000000f
+            hex   000000ff
+            hex   00000000
+            hex   0000000f
+            hex   000000ff
+            hex   0000000f
+
+            hex   00000883
+            hex   88088388
+            hex   08838888
+            hex   00888838
+            hex   88883888
+            hex   08889988
+            hex   00899899
+            hex   08899889
+
+            hex   fffff000
+            hex   00f00000
+            hex   f0000000
+            hex   ff000000
+            hex   00000000
+            hex   f0000000
+            hex   ff000000
+            hex   f0000000
+
+; Tile ID 83
+; From image coordinates 144, 16
+            hex   00000000
+            hex   00000088
+            hex   00000008
+            hex   00008888
+            hex   80008899
+            hex   80000898
+            hex   88888988
+            hex   88888999
+
+            hex   ffffffff
+            hex   ffffff00
+            hex   fffffff0
+            hex   ffff0000
+            hex   0fff0000
+            hex   0ffff000
+            hex   00000000
+            hex   00000000
+
+            hex   00000000
+            hex   88000000
+            hex   80000000
+            hex   88880000
+            hex   99880008
+            hex   89800008
+            hex   88988888
+            hex   99988888
+
+            hex   ffffffff
+            hex   00ffffff
+            hex   0fffffff
+            hex   0000ffff
+            hex   0000fff0
+            hex   000ffff0
+            hex   00000000
+            hex   00000000
+
+; Tile ID 84
+; From image coordinates 152, 16
+            hex   00800800
+            hex   08808800
+            hex   88888800
+            hex   99888880
+            hex   99938880
+            hex   88988838
+            hex   89883888
+            hex   99888883
+
+            hex   ff0ff0ff
+            hex   f00f00ff
+            hex   000000ff
+            hex   0000000f
+            hex   0000000f
+            hex   00000000
+            hex   00000000
+            hex   00000000
+
+            hex   00800800
+            hex   00880880
+            hex   00888888
+            hex   08888899
+            hex   08883999
+            hex   83888988
+            hex   88838898
+            hex   38888899
+
+            hex   ff0ff0ff
+            hex   ff00f00f
+            hex   ff000000
+            hex   f0000000
+            hex   f0000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+
+; Tile ID 85
+; From image coordinates 160, 16
+            hex   00000008
+            hex   00000008
+            hex   00008008
+            hex   00008888
+            hex   00800899
+            hex   00880898
+            hex   00888988
+            hex   00888999
+
+            hex   fffffff0
+            hex   fffffff0
+            hex   ffff0ff0
+            hex   ffff0000
+            hex   ff0ff000
+            hex   ff00f000
+            hex   ff000000
+            hex   ff000000
+
+            hex   80000000
+            hex   80000000
+            hex   80080000
+            hex   88880000
+            hex   99800800
+            hex   89808800
+            hex   88988800
+            hex   99988800
+
+            hex   0fffffff
+            hex   0fffffff
+            hex   0ff0ffff
+            hex   0000ffff
+            hex   000ff0ff
+            hex   000f00ff
+            hex   000000ff
+            hex   000000ff
+
+; Tile ID 86
+; From image coordinates 168, 16
+            hex   00080080
+            hex   80880880
+            hex   88888800
+            hex   99888880
+            hex   99938880
+            hex   88988838
+            hex   89883888
+            hex   99888883
+
+            hex   fff0ff0f
+            hex   0f00f00f
+            hex   000000ff
+            hex   0000000f
+            hex   0000000f
+            hex   00000000
+            hex   00000000
+            hex   00000000
+
+            hex   08008000
+            hex   08808808
+            hex   00888888
+            hex   08888899
+            hex   08883999
+            hex   83888988
+            hex   88838898
+            hex   38888899
+
+            hex   f0ff0fff
+            hex   f00f00f0
+            hex   ff000000
+            hex   f0000000
+            hex   f0000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+
+; Tile ID 87
+; From image coordinates 176, 16
+            hex   00000000
+            hex   00000000
+            hex   00332000
+            hex   02233200
+            hex   23233220
+            hex   23332220
+            hex   23233232
+            hex   33323232
+
+            hex   ffffffff
+            hex   ffffffff
+            hex   ff000fff
+            hex   f00000ff
+            hex   0000000f
+            hex   0000000f
+            hex   00000000
+            hex   00000000
+
+            hex   00000000
+            hex   00000000
+            hex   00023300
+            hex   00233220
+            hex   02233232
+            hex   02223332
+            hex   23233232
+            hex   23232333
+
+            hex   ffffffff
+            hex   ffffffff
+            hex   fff000ff
+            hex   ff00000f
+            hex   f0000000
+            hex   f0000000
+            hex   00000000
+            hex   00000000
+
+; Tile ID 88
+; From image coordinates 184, 16
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+
+; Tile ID 89
+; From image coordinates 192, 16
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+
+; Tile ID 90
+; From image coordinates 200, 16
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+
+; Tile ID 91
+; From image coordinates 208, 16
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+
+; Tile ID 92
+; From image coordinates 216, 16
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+
+; Tile ID 93
+; From image coordinates 224, 16
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+
+; Tile ID 94
+; From image coordinates 232, 16
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+
+; Tile ID 95
+; From image coordinates 240, 16
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+
+; Tile ID 96
+; From image coordinates 248, 16
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+
+; Tile ID 97
+; From image coordinates 0, 24
+            hex   06666666
+            hex   66667666
+            hex   66666666
+            hex   66766666
+            hex   06666667
+            hex   00066a6a
+            hex   00007aaa
+            hex   00077777
+
+            hex   f0000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   f0000000
+            hex   fff00000
+            hex   ffff0000
+            hex   fff00000
+
+            hex   66666660
+            hex   66676666
+            hex   66666666
+            hex   66666766
+            hex   76666660
+            hex   a6a66000
+            hex   aaa70000
+            hex   77777000
+
+            hex   0000000f
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   0000000f
+            hex   00000fff
+            hex   0000ffff
+            hex   00000fff
+
+; Tile ID 98
+; From image coordinates 8, 24
+            hex   76677670
+            hex   66677770
+            hex   67777700
+            hex   66767700
+            hex   77777000
+            hex   77600000
+            hex   aa777777
+            hex   77777700
+
+            hex   0000000f
+            hex   0000000f
+            hex   000000ff
+            hex   000000ff
+            hex   00000fff
+            hex   000fffff
+            hex   00000000
+            hex   000000ff
+
+            hex   07677667
+            hex   07777666
+            hex   00777776
+            hex   00776766
+            hex   00077777
+            hex   00000677
+            hex   777777aa
+            hex   00777777
+
+            hex   f0000000
+            hex   f0000000
+            hex   ff000000
+            hex   ff000000
+            hex   fff00000
+            hex   fffff000
+            hex   00000000
+            hex   ff000000
+
+; Tile ID 99
+; From image coordinates 16, 24
+            hex   56667566
+            hex   56667566
+            hex   56667566
+            hex   66667666
+            hex   66667666
+            hex   66666666
+            hex   56666676
+            hex   77777777
+
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+
+            hex   66576665
+            hex   66576665
+            hex   66576665
+            hex   66676666
+            hex   66676666
+            hex   66666666
+            hex   67666665
+            hex   77777777
+
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+
+; Tile ID 100
+; From image coordinates 24, 24
+            hex   76676775
+            hex   77676775
+            hex   77676775
+            hex   67677775
+            hex   66677675
+            hex   67776655
+            hex   66777777
+            hex   77777755
+
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+
+            hex   57767667
+            hex   57767677
+            hex   57767677
+            hex   57777676
+            hex   57677666
+            hex   55667776
+            hex   77777766
+            hex   55777777
+
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+
+; Tile ID 101
+; From image coordinates 32, 24
+            hex   55577667
+            hex   55667667
+            hex   56666667
+            hex   56667667
+            hex   56667677
+            hex   56667677
+            hex   66666677
+            hex   66666677
+
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+
+            hex   76677555
+            hex   76676655
+            hex   76666665
+            hex   76676665
+            hex   77676665
+            hex   77676665
+            hex   77666666
+            hex   77666666
+
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+
+; Tile ID 102
+; From image coordinates 40, 24
+            hex   66666665
+            hex   66666665
+            hex   66666675
+            hex   56666677
+            hex   76666677
+            hex   66666677
+            hex   76666775
+            hex   76776675
+
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+
+            hex   56666666
+            hex   56666666
+            hex   57666666
+            hex   77666665
+            hex   77666667
+            hex   77666666
+            hex   57766667
+            hex   57667767
+
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+
+; Tile ID 103
+; From image coordinates 48, 24
+            hex   66666675
+            hex   66666775
+            hex   66666775
+            hex   56666677
+            hex   76666667
+            hex   55776667
+            hex   66667677
+            hex   66677667
+
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+
+            hex   57666666
+            hex   57766666
+            hex   57766666
+            hex   77666665
+            hex   76666667
+            hex   76667755
+            hex   77676666
+            hex   76677666
+
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+
+; Tile ID 104
+; From image coordinates 56, 24
+            hex   67666755
+            hex   66666755
+            hex   66666675
+            hex   56666675
+            hex   56666675
+            hex   56666775
+            hex   57766775
+            hex   57776755
+
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+
+            hex   55766676
+            hex   55766666
+            hex   57666666
+            hex   57666665
+            hex   57666665
+            hex   57766665
+            hex   57766775
+            hex   55767775
+
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+
+; Tile ID 105
+; From image coordinates 64, 24
+            hex   55577666
+            hex   55557676
+            hex   55555777
+            hex   55555555
+            hex   55555555
+            hex   55555555
+            hex   55555555
+            hex   55555555
+
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+
+            hex   66677555
+            hex   67675555
+            hex   77755555
+            hex   55555555
+            hex   55555555
+            hex   55555555
+            hex   55555555
+            hex   55555555
+
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+
+; Tile ID 106
+; From image coordinates 72, 24
+            hex   66777566
+            hex   67777566
+            hex   77777566
+            hex   77777566
+            hex   55557566
+            hex   55555766
+            hex   55555766
+            hex   55555577
+
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+
+            hex   66577766
+            hex   66577776
+            hex   66577777
+            hex   66577777
+            hex   66575555
+            hex   66755555
+            hex   66755555
+            hex   77555555
+
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+
+; Tile ID 107
+; From image coordinates 80, 24
+            hex   66677566
+            hex   66677566
+            hex   56777576
+            hex   56755577
+            hex   67566666
+            hex   67566667
+            hex   65666666
+            hex   75656657
+
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+
+            hex   66577666
+            hex   66577666
+            hex   67577765
+            hex   77555765
+            hex   66666576
+            hex   76666576
+            hex   66666656
+            hex   75665657
+
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+
+; Tile ID 108
+; From image coordinates 88, 24
+            hex   66566667
+            hex   66566667
+            hex   67566677
+            hex   67566675
+            hex   77566675
+            hex   77566675
+            hex   77766777
+            hex   57755775
+
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+
+            hex   76666566
+            hex   76666566
+            hex   77666576
+            hex   57666576
+            hex   57666577
+            hex   57666577
+            hex   77766777
+            hex   57755775
+
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+
+; Tile ID 109
+; From image coordinates 96, 24
+            hex   56667667
+            hex   56667667
+            hex   75667667
+            hex   75667667
+            hex   75667677
+            hex   75677775
+            hex   77555555
+            hex   55555555
+
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+
+            hex   76676665
+            hex   76676665
+            hex   76676657
+            hex   76676657
+            hex   77676657
+            hex   57777657
+            hex   55555577
+            hex   55555555
+
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+
+; Tile ID 110
+; From image coordinates 104, 24
+            hex   75555555
+            hex   75555555
+            hex   75555555
+            hex   75555555
+            hex   55555555
+            hex   55555555
+            hex   55555555
+            hex   55555555
+
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+
+            hex   55555557
+            hex   55555557
+            hex   55555557
+            hex   55555557
+            hex   55555555
+            hex   55555555
+            hex   55555555
+            hex   55555555
+
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+
+; Tile ID 111
+; From image coordinates 112, 24
+            hex   08889889
+            hex   08089989
+            hex   00088899
+            hex   00088088
+            hex   00000088
+            hex   00000088
+            hex   00000088
+            hex   00008888
+
+            hex   f0000000
+            hex   f0f00000
+            hex   fff00000
+            hex   fff00f00
+            hex   ffffff00
+            hex   ffffff00
+            hex   ffffff00
+            hex   ffff0000
+
+            hex   98898880
+            hex   98998080
+            hex   99888000
+            hex   88088000
+            hex   88000000
+            hex   88000000
+            hex   88000000
+            hex   88880000
+
+            hex   0000000f
+            hex   00000f0f
+            hex   00000fff
+            hex   00f00fff
+            hex   00ffffff
+            hex   00ffffff
+            hex   00ffffff
+            hex   0000ffff
+
+; Tile ID 112
+; From image coordinates 120, 24
+            hex   98898880
+            hex   98998080
+            hex   99888000
+            hex   88088000
+            hex   88000000
+            hex   88000000
+            hex   88000000
+            hex   88880000
+
+            hex   0000000f
+            hex   00000f0f
+            hex   00000fff
+            hex   00f00fff
+            hex   00ffffff
+            hex   00ffffff
+            hex   00ffffff
+            hex   0000ffff
+
+            hex   08889889
+            hex   08089989
+            hex   00088899
+            hex   00088088
+            hex   00000088
+            hex   00000088
+            hex   00000088
+            hex   00008888
+
+            hex   f0000000
+            hex   f0f00000
+            hex   fff00000
+            hex   fff00f00
+            hex   ffffff00
+            hex   ffffff00
+            hex   ffffff00
+            hex   ffff0000
+
+; Tile ID 113
+; From image coordinates 128, 24
+            hex   88889889
+            hex   00089989
+            hex   00088899
+            hex   00880088
+            hex   00000888
+            hex   00008888
+            hex   00000000
+            hex   00000000
+
+            hex   00000000
+            hex   fff00000
+            hex   fff00000
+            hex   ff00ff00
+            hex   fffff000
+            hex   ffff0000
+            hex   ffffffff
+            hex   ffffffff
+
+            hex   98898888
+            hex   98998000
+            hex   99888000
+            hex   88008800
+            hex   88800000
+            hex   88880000
+            hex   00000000
+            hex   00000000
+
+            hex   00000000
+            hex   00000fff
+            hex   00000fff
+            hex   00ff00ff
+            hex   000fffff
+            hex   0000ffff
+            hex   ffffffff
+            hex   ffffffff
+
+; Tile ID 114
+; From image coordinates 136, 24
+            hex   98898888
+            hex   98998000
+            hex   99888000
+            hex   88008800
+            hex   88800000
+            hex   88880000
+            hex   00000000
+            hex   00000000
+
+            hex   00000000
+            hex   00000fff
+            hex   00000fff
+            hex   00ff00ff
+            hex   000fffff
+            hex   0000ffff
+            hex   ffffffff
+            hex   ffffffff
+
+            hex   88889889
+            hex   00089989
+            hex   00088899
+            hex   00880088
+            hex   00000888
+            hex   00008888
+            hex   00000000
+            hex   00000000
+
+            hex   00000000
+            hex   fff00000
+            hex   fff00000
+            hex   ff00ff00
+            hex   fffff000
+            hex   ffff0000
+            hex   ffffffff
+            hex   ffffffff
+
+; Tile ID 115
+; From image coordinates 144, 24
+            hex   88888999
+            hex   88888988
+            hex   80000898
+            hex   80008899
+            hex   00008888
+            hex   00000008
+            hex   00000088
+            hex   00000000
+
+            hex   00000000
+            hex   00000000
+            hex   0ffff000
+            hex   0fff0000
+            hex   ffff0000
+            hex   fffffff0
+            hex   ffffff00
+            hex   ffffffff
+
+            hex   99988888
+            hex   88988888
+            hex   89800008
+            hex   99880008
+            hex   88880000
+            hex   80000000
+            hex   88000000
+            hex   00000000
+
+            hex   00000000
+            hex   00000000
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+; Tile ID 116
+; From image coordinates 152, 24
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+
+; Tile ID 117
+; From image coordinates 160, 24
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+
+; Tile ID 118
+; From image coordinates 168, 24
+            hex   99888883
+            hex   89883888
+            hex   88988838
+            hex   99938880
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+
+; Tile ID 119
+; From image coordinates 176, 24
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+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+
+; Tile ID 120
+; From image coordinates 184, 24
+            hex   00000000
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+            hex   ffffffff
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+            hex   ffffffff
+            hex   ffffffff
+
+; Tile ID 121
+; From image coordinates 192, 24
+            hex   00000000
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+            hex   ffffffff
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+            hex   ffffffff
+
+; Tile ID 122
+; From image coordinates 200, 24
+            hex   00000000
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+            hex   ffffffff
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+            hex   ffffffff
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+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+
+; Tile ID 123
+; From image coordinates 208, 24
+            hex   00000000
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+            hex   ffffffff
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+            hex   ffffffff
+            hex   ffffffff
+
+; Tile ID 124
+; From image coordinates 216, 24
+            hex   00000000
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+            hex   ffffffff
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+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+
+; Tile ID 125
+; From image coordinates 224, 24
+            hex   00000000
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+            hex   ffffffff
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+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+
+; Tile ID 126
+; From image coordinates 232, 24
+            hex   00000000
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+
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+            hex   ffffffff
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+            hex   ffffffff
+
+; Tile ID 127
+; From image coordinates 240, 24
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+            hex   ffffffff
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+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+
+; Tile ID 128
+; From image coordinates 248, 24
+            hex   00000000
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+            hex   ffffffff
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+
+; Tile ID 129
+; From image coordinates 0, 32
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+
+            hex   00000000
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+
+; Tile ID 130
+; From image coordinates 8, 32
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+
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+
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+
+; Tile ID 131
+; From image coordinates 16, 32
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+
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+
+            hex   ffffffff
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+
+; Tile ID 132
+; From image coordinates 24, 32
+            hex   00000000
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+
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+
+            hex   ffffffff
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+
+; Tile ID 133
+; From image coordinates 32, 32
+            hex   00000000
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+
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+
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+
+            hex   ffffffff
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+            hex   ffffffff
+            hex   ffffffff
+
+; Tile ID 134
+; From image coordinates 40, 32
+            hex   00000000
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+
+            hex   ffffffff
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+
+            hex   ffffffff
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+            hex   ffffffff
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+            hex   ffffffff
+            hex   ffffffff
+
+; Tile ID 135
+; From image coordinates 48, 32
+            hex   00000000
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+
+            hex   ffffffff
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+
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+
+            hex   ffffffff
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+            hex   ffffffff
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+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+
+; Tile ID 136
+; From image coordinates 56, 32
+            hex   00000000
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+            hex   00000000
+
+            hex   ffffffff
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+
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+
+            hex   ffffffff
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+            hex   ffffffff
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+            hex   ffffffff
+            hex   ffffffff
+
+; Tile ID 137
+; From image coordinates 64, 32
+            hex   00000000
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+
+            hex   ffffffff
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+
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+
+            hex   ffffffff
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+            hex   ffffffff
+            hex   ffffffff
+
+; Tile ID 138
+; From image coordinates 72, 32
+            hex   00000000
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+
+            hex   ffffffff
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+
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+
+            hex   ffffffff
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+            hex   ffffffff
+            hex   ffffffff
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+
+; Tile ID 139
+; From image coordinates 80, 32
+            hex   00000000
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+
+            hex   ffffffff
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+
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+
+            hex   ffffffff
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+
+; Tile ID 140
+; From image coordinates 88, 32
+            hex   00000000
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+
+            hex   ffffffff
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+
+            hex   ffffffff
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+
+; Tile ID 141
+; From image coordinates 96, 32
+            hex   00000000
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+
+            hex   ffffffff
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+
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+
+            hex   ffffffff
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+
+; Tile ID 142
+; From image coordinates 104, 32
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+
+            hex   ffffffff
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+
+            hex   ffffffff
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+
+; Tile ID 143
+; From image coordinates 112, 32
+            hex   00000000
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+
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+
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+
+            hex   ffffffff
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+
+; Tile ID 144
+; From image coordinates 120, 32
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+
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+
+; Tile ID 145
+; From image coordinates 128, 32
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+
+; Tile ID 146
+; From image coordinates 136, 32
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+
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+; Tile ID 147
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+; Tile ID 148
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+; Tile ID 149
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+; Tile ID 150
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+; Tile ID 151
+; From image coordinates 176, 32
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+; Tile ID 152
+; From image coordinates 184, 32
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+; Tile ID 153
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+; Tile ID 154
+; From image coordinates 200, 32
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+; Tile ID 155
+; From image coordinates 208, 32
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+; Tile ID 156
+; From image coordinates 216, 32
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+; Tile ID 157
+; From image coordinates 224, 32
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+; Tile ID 158
+; From image coordinates 232, 32
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+; Tile ID 159
+; From image coordinates 240, 32
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+; Tile ID 160
+; From image coordinates 248, 32
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+; Tile ID 161
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+; Tile ID 162
+; From image coordinates 8, 40
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+; Tile ID 163
+; From image coordinates 16, 40
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+; Tile ID 164
+; From image coordinates 24, 40
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+; Tile ID 165
+; From image coordinates 32, 40
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+; Tile ID 166
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+; Tile ID 167
+; From image coordinates 48, 40
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+; Tile ID 168
+; From image coordinates 56, 40
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+; Tile ID 169
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+; Tile ID 170
+; From image coordinates 72, 40
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+; Tile ID 171
+; From image coordinates 80, 40
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+; Tile ID 172
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+; Tile ID 173
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+; Tile ID 174
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+; Tile ID 175
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+; Tile ID 176
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+; Tile ID 177
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+; Tile ID 178
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+; Tile ID 179
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+; Tile ID 180
+; From image coordinates 152, 40
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+; Tile ID 181
+; From image coordinates 160, 40
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+; Tile ID 182
+; From image coordinates 168, 40
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+; Tile ID 183
+; From image coordinates 176, 40
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+; Tile ID 184
+; From image coordinates 184, 40
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+; Tile ID 185
+; From image coordinates 192, 40
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+; Tile ID 186
+; From image coordinates 200, 40
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+; Tile ID 187
+; From image coordinates 208, 40
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+; Tile ID 188
+; From image coordinates 216, 40
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+; Tile ID 189
+; From image coordinates 224, 40
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+; Tile ID 190
+; From image coordinates 232, 40
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+; Tile ID 191
+; From image coordinates 240, 40
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+; Tile ID 192
+; From image coordinates 248, 40
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+; Tile ID 193
+; From image coordinates 0, 48
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+; Tile ID 194
+; From image coordinates 8, 48
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+; Tile ID 195
+; From image coordinates 16, 48
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+; Tile ID 196
+; From image coordinates 24, 48
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+; Tile ID 197
+; From image coordinates 32, 48
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+; Tile ID 198
+; From image coordinates 40, 48
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+; Tile ID 199
+; From image coordinates 48, 48
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+; Tile ID 200
+; From image coordinates 56, 48
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+; Tile ID 201
+; From image coordinates 64, 48
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+; Tile ID 202
+; From image coordinates 72, 48
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+; Tile ID 203
+; From image coordinates 80, 48
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+; Tile ID 204
+; From image coordinates 88, 48
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+; Tile ID 205
+; From image coordinates 96, 48
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+; Tile ID 206
+; From image coordinates 104, 48
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+; Tile ID 207
+; From image coordinates 112, 48
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+; Tile ID 208
+; From image coordinates 120, 48
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+; Tile ID 209
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+; Tile ID 210
+; From image coordinates 136, 48
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+; Tile ID 211
+; From image coordinates 144, 48
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+; Tile ID 212
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+; Tile ID 213
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+; Tile ID 214
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+; Tile ID 215
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+; Tile ID 216
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+; Tile ID 217
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+; Tile ID 218
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+; Tile ID 219
+; From image coordinates 208, 48
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+; Tile ID 220
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+; Tile ID 221
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+; Tile ID 222
+; From image coordinates 232, 48
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+; Tile ID 223
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+; Tile ID 224
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+; Tile ID 225
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+; Tile ID 226
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+; Tile ID 227
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+; Tile ID 228
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+; Tile ID 229
+; From image coordinates 32, 56
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+; Tile ID 230
+; From image coordinates 40, 56
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+; Tile ID 231
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+; Tile ID 232
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+; Tile ID 233
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+; Tile ID 234
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+; Tile ID 235
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+; Tile ID 236
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+; Tile ID 237
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+; Tile ID 238
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+; Tile ID 239
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+; Tile ID 240
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+; Tile ID 241
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+; Tile ID 242
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+; Tile ID 243
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+; Tile ID 244
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+; Tile ID 245
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+; Tile ID 246
+; From image coordinates 168, 56
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+; Tile ID 247
+; From image coordinates 176, 56
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+; Tile ID 248
+; From image coordinates 184, 56
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+; Tile ID 249
+; From image coordinates 192, 56
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+; Tile ID 250
+; From image coordinates 200, 56
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+; Tile ID 251
+; From image coordinates 208, 56
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+; Tile ID 252
+; From image coordinates 216, 56
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+; Tile ID 253
+; From image coordinates 224, 56
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+; Tile ID 254
+; From image coordinates 232, 56
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+; Tile ID 255
+; From image coordinates 240, 56
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+; Tile ID 256
+; From image coordinates 248, 56
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+; Tile ID 257
+; From image coordinates 0, 64
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+; Tile ID 258
+; From image coordinates 8, 64
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+; Tile ID 259
+; From image coordinates 16, 64
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+; Tile ID 260
+; From image coordinates 24, 64
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+; Tile ID 261
+; From image coordinates 32, 64
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+; Tile ID 262
+; From image coordinates 40, 64
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+; Tile ID 263
+; From image coordinates 48, 64
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+; Tile ID 264
+; From image coordinates 56, 64
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+; Tile ID 265
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+; Tile ID 266
+; From image coordinates 72, 64
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+; Tile ID 267
+; From image coordinates 80, 64
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+; Tile ID 268
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+; Tile ID 269
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+; Tile ID 270
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+; Tile ID 271
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+; Tile ID 272
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+; Tile ID 273
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+; Tile ID 274
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+; Tile ID 275
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+; Tile ID 276
+; From image coordinates 152, 64
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+; Tile ID 277
+; From image coordinates 160, 64
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+; Tile ID 278
+; From image coordinates 168, 64
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+; Tile ID 279
+; From image coordinates 176, 64
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+; Tile ID 280
+; From image coordinates 184, 64
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+; Tile ID 281
+; From image coordinates 192, 64
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+; Tile ID 282
+; From image coordinates 200, 64
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+; Tile ID 283
+; From image coordinates 208, 64
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+; Tile ID 284
+; From image coordinates 216, 64
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+
+; Tile ID 285
+; From image coordinates 224, 64
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+; Tile ID 286
+; From image coordinates 232, 64
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+; Tile ID 287
+; From image coordinates 240, 64
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+; Tile ID 288
+; From image coordinates 248, 64
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+; Tile ID 289
+; From image coordinates 0, 72
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+; Tile ID 290
+; From image coordinates 8, 72
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+; Tile ID 291
+; From image coordinates 16, 72
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+; Tile ID 292
+; From image coordinates 24, 72
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+; Tile ID 293
+; From image coordinates 32, 72
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+; Tile ID 294
+; From image coordinates 40, 72
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+; Tile ID 295
+; From image coordinates 48, 72
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+; Tile ID 296
+; From image coordinates 56, 72
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+
+; Tile ID 297
+; From image coordinates 64, 72
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+
+; Tile ID 298
+; From image coordinates 72, 72
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+
+; Tile ID 299
+; From image coordinates 80, 72
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+
+; Tile ID 300
+; From image coordinates 88, 72
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+; Tile ID 301
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+
+; Tile ID 302
+; From image coordinates 104, 72
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+; Tile ID 303
+; From image coordinates 112, 72
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+; Tile ID 304
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+
+; Tile ID 305
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+
+; Tile ID 306
+; From image coordinates 136, 72
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+; Tile ID 307
+; From image coordinates 144, 72
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+; Tile ID 308
+; From image coordinates 152, 72
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+; Tile ID 309
+; From image coordinates 160, 72
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+; Tile ID 310
+; From image coordinates 168, 72
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+; Tile ID 311
+; From image coordinates 176, 72
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+; Tile ID 312
+; From image coordinates 184, 72
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+; Tile ID 313
+; From image coordinates 192, 72
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+; Tile ID 314
+; From image coordinates 200, 72
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+; Tile ID 315
+; From image coordinates 208, 72
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+; Tile ID 316
+; From image coordinates 216, 72
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+; Tile ID 317
+; From image coordinates 224, 72
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+; Tile ID 318
+; From image coordinates 232, 72
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+; Tile ID 319
+; From image coordinates 240, 72
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+; Tile ID 320
+; From image coordinates 248, 72
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+; Tile ID 321
+; From image coordinates 0, 80
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+; Tile ID 322
+; From image coordinates 8, 80
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+; Tile ID 323
+; From image coordinates 16, 80
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+; Tile ID 324
+; From image coordinates 24, 80
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+; Tile ID 325
+; From image coordinates 32, 80
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+; Tile ID 326
+; From image coordinates 40, 80
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+; Tile ID 327
+; From image coordinates 48, 80
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+; Tile ID 328
+; From image coordinates 56, 80
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+; Tile ID 329
+; From image coordinates 64, 80
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+; Tile ID 330
+; From image coordinates 72, 80
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+
+; Tile ID 331
+; From image coordinates 80, 80
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+; Tile ID 332
+; From image coordinates 88, 80
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+; Tile ID 333
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+; Tile ID 334
+; From image coordinates 104, 80
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+; Tile ID 335
+; From image coordinates 112, 80
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+; Tile ID 336
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+; Tile ID 337
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+; Tile ID 338
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+; Tile ID 339
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+
+; Tile ID 340
+; From image coordinates 152, 80
+            hex   00000000
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+
+            hex   ffffffff
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+            hex   00000000
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+
+            hex   ffffffff
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+
+; Tile ID 341
+; From image coordinates 160, 80
+            hex   00000000
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+            hex   ffffffff
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+
+            hex   ffffffff
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+
+; Tile ID 342
+; From image coordinates 168, 80
+            hex   00000000
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+            hex   ffffffff
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+
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+
+            hex   ffffffff
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+            hex   ffffffff
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+
+; Tile ID 343
+; From image coordinates 176, 80
+            hex   00000000
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+
+            hex   ffffffff
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+
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+
+            hex   ffffffff
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+
+; Tile ID 344
+; From image coordinates 184, 80
+            hex   00000000
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+
+            hex   ffffffff
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+
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+
+            hex   ffffffff
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+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+
+; Tile ID 345
+; From image coordinates 192, 80
+            hex   00000000
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+
+            hex   ffffffff
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+
+            hex   ffffffff
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+            hex   ffffffff
+            hex   ffffffff
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+            hex   ffffffff
+
+; Tile ID 346
+; From image coordinates 200, 80
+            hex   00000000
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+
+            hex   ffffffff
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+
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+
+            hex   ffffffff
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+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+
+; Tile ID 347
+; From image coordinates 208, 80
+            hex   00000000
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+            hex   00000000
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+            hex   00000000
+
+            hex   ffffffff
+            hex   ffffffff
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+
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+
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+
+; Tile ID 348
+; From image coordinates 216, 80
+            hex   00000000
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+            hex   00000000
+            hex   00000000
+            hex   00000000
+
+            hex   ffffffff
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+
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+
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+
+; Tile ID 349
+; From image coordinates 224, 80
+            hex   00000000
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+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+
+            hex   ffffffff
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+            hex   00000000
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+
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+
+; Tile ID 350
+; From image coordinates 232, 80
+            hex   00000000
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+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+            hex   00000000
+
+            hex   ffffffff
+            hex   ffffffff
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+
+            hex   00000000
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+
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+
+; Tile ID 351
+; From image coordinates 240, 80
+            hex   00000000
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+
+            hex   ffffffff
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+
+            hex   00000000
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+
+            hex   ffffffff
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+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
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+
+; Tile ID 352
+; From image coordinates 248, 80
+            hex   00000000
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+
+            hex   ffffffff
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+
+            hex   ffffffff
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+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+
+; Tile ID 353
+; From image coordinates 0, 88
+            hex   00000000
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+
+            hex   ffffffff
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+
+            hex   00000000
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+
+            hex   ffffffff
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+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+
+; Tile ID 354
+; From image coordinates 8, 88
+            hex   00000000
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+
+            hex   ffffffff
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+
+            hex   00000000
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+
+            hex   ffffffff
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+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+
+; Tile ID 355
+; From image coordinates 16, 88
+            hex   00000000
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+
+            hex   ffffffff
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+            hex   00000000
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+
+            hex   ffffffff
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+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+
+; Tile ID 356
+; From image coordinates 24, 88
+            hex   00000000
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+
+            hex   ffffffff
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+            hex   00000000
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+
+            hex   ffffffff
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+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
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+
+; Tile ID 357
+; From image coordinates 32, 88
+            hex   00000000
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+            hex   ffffffff
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+            hex   00000000
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+
+            hex   ffffffff
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+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+
+; Tile ID 358
+; From image coordinates 40, 88
+            hex   00000000
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+
+            hex   ffffffff
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+
+            hex   00000000
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+
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+
+; Tile ID 359
+; From image coordinates 48, 88
+            hex   00000000
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+            hex   00000000
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+
+            hex   ffffffff
+            hex   ffffffff
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+
+            hex   00000000
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+
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+            hex   ffffffff
+
+; Tile ID 360
+; From image coordinates 56, 88
+            hex   00000000
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+            hex   00000000
+            hex   00000000
+            hex   00000000
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+
+            hex   ffffffff
+            hex   ffffffff
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+            hex   ffffffff
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+
+            hex   00000000
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+
+            hex   ffffffff
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+
diff --git a/demos/tool/_FileInformation.txt b/demos/tool/_FileInformation.txt
new file mode 100644
index 0000000..f79c6dd
--- /dev/null
+++ b/demos/tool/_FileInformation.txt
@@ -0,0 +1 @@
+GTEToolDemo=Type(B3),AuxType(0000),VersionCreate(70),MinVersion(BE),Access(E3),FolderInfo1(000000000000000000000000000000000000),FolderInfo2(000000000000000000000000000000000000)
diff --git a/demos/tool/build-image.bat b/demos/tool/build-image.bat
new file mode 100644
index 0000000..462afd6
--- /dev/null
+++ b/demos/tool/build-image.bat
@@ -0,0 +1,19 @@
+echo off
+
+REM Copy all of the assets into the ProDOS image for emulator testing
+REM
+REM Pass the path of the Cadius tool as the first argument (%1)
+
+set CADIUS="%1"
+set IMAGE="..\\..\\emu\\Target.2mg"
+set FOLDER="/GTEDEV/Tool"
+
+REM Cadius does not overwrite files, so clear the root folder first
+%CADIUS% DELETEFOLDER %IMAGE% %FOLDER%
+%CADIUS% CREATEFOLDER %IMAGE% %FOLDER%
+
+REM Now copy files and folders as needed
+%CADIUS% ADDFILE %IMAGE% %FOLDER% .\GTEToolDemo
+%CADIUS% ADDFILE %IMAGE% %FOLDER% ..\..\src\Tool160
+
+REM Copy in the image assets
diff --git a/demos/tool/font.s b/demos/tool/font.s
new file mode 100644
index 0000000..8c71e10
--- /dev/null
+++ b/demos/tool/font.s
@@ -0,0 +1,668 @@
+****************************************
+* FONT ENGINE (v3?)                    *
+*                                      *
+*  Dagen Brock <dagenbrock@gmail.com>  *
+*  2013-07-20                          *
+****************************************
+* A= ptr to string preceded by length  *
+* X= screen location                   *
+****************************************
+; each char:
+;  draw char at loc
+;  update loc
+;  see if length hit - no? back to draw char
+               rel
+               mx    %00
+]F_Length      ds    2                    ;length of string (only one byte currently used)
+]F_CharIdx     ds    2                    ;index of current character
+]F_CurrentPos  ds    2                    ;current top left char position
+]F_StrPtr      equ   $01                  ;pointer to string (including length byte) / DP
+]F_StrClr      equ   $03
+
+DrawString
+               pha                        ; local variable space
+               pha
+               tsc
+               phd
+               tcd
+
+;               sta   ]F_StrPtr            ; (done in pha init above) store at dp 0 ($00) for indirect loads
+               stx   ]F_CurrentPos
+               sty   ]F_StrClr
+               stz   ]F_CharIdx
+               lda   (]F_StrPtr)
+               and   #$00ff               ;strip off first char (len is only one byte)
+               sta   ]F_Length            ;get our length byte
+
+NextChar       lda   ]F_CharIdx
+               cmp   ]F_Length
+               bne   :notDone
+               ldy   ]F_StrClr            ;restore the color pattern
+               pld
+               pla
+               pla
+               rts                        ;DONE! Return to caller
+
+:notDone       inc   ]F_CharIdx
+               ldy   ]F_CharIdx
+               lda   (]F_StrPtr),y        ;get next char!
+               and   #$00FF               ;mask high byte
+               sec
+               sbc   #' '                 ;our table starts with space ' '
+               asl                        ;*2
+               tay
+               ldx   ]F_CurrentPos
+               jsr   :drawChar
+               inc   ]F_CurrentPos        ;compare to addition time (?)
+               inc   ]F_CurrentPos
+               inc   ]F_CurrentPos
+               inc   ]F_CurrentPos        ;update screen pos (2 words=8 pixels)
+               bra   NextChar
+
+;x = TopLeft screen pos
+;y = char table offset
+:drawChar      lda   FontTable,y          ;get real address of char data
+               sec
+               sbc   #FontData            ;pivot offset - now a is offset of fontdata
+               tay                        ;so we'll index with that
+
+               lda   FontData,y
+               and   ]F_StrClr
+               stal  $E12000,x
+
+               lda   FontData+2,y
+               and   ]F_StrClr
+               stal  $E12000+2,x
+
+               lda   FontData+4,y
+               and   ]F_StrClr
+               stal  $E12000+160,x
+
+               lda   FontData+6,y
+               and   ]F_StrClr
+               stal  $E12000+160+2,x
+
+               lda   FontData+8,y
+               and   ]F_StrClr
+               stal  {$E12000+160*2},x
+
+               lda   FontData+10,y
+               and   ]F_StrClr
+               stal  {$E12000+160*2+2},x
+
+               lda   FontData+12,y
+               and   ]F_StrClr
+               stal  {$E12000+160*3},x
+
+               lda   FontData+14,y
+               and   ]F_StrClr
+               stal  {$E12000+160*3+2},x
+
+               lda   FontData+16,y
+               and   ]F_StrClr
+               stal  {$E12000+160*4},x
+
+               lda   FontData+18,y
+               and   ]F_StrClr
+               stal  {$E12000+160*4+2},x
+
+               lda   FontData+20,y
+               and   ]F_StrClr
+               stal  {$E12000+160*5},x
+
+               lda   FontData+22,y
+               and   ]F_StrClr
+               stal  {$E12000+160*5+2},x
+               rts
+
+FontTable      dw    s_Space
+               dw    s_Exclaim
+               dw    s_Quote
+               dw    s_Number
+               dw    s_Dollar
+               dw    s_Percent
+               dw    s_Amper
+               dw    s_Single
+               dw    s_OpenParen
+               dw    s_CloseParen
+               dw    s_Asterix
+               dw    s_Plus
+               dw    s_Comma
+               dw    s_Minus
+               dw    s_Period
+               dw    s_Slash
+               dw    s_N0
+               dw    s_N1
+               dw    s_N2
+               dw    s_N3
+               dw    s_N4
+               dw    s_N5
+               dw    s_N6
+               dw    s_N7
+               dw    s_N8
+               dw    s_N9
+               dw    s_Colon
+               dw    s_Semi
+               dw    s_LAngle
+               dw    s_Equal
+               dw    s_RAngle
+               dw    s_Question
+               dw    s_At
+               dw    s_A
+               dw    s_B
+               dw    s_C
+               dw    s_D
+               dw    s_E
+               dw    s_F
+               dw    s_G
+               dw    s_H
+               dw    s_I
+               dw    s_J
+               dw    s_K
+               dw    s_L
+               dw    s_M
+               dw    s_N
+               dw    s_O
+               dw    s_P
+               dw    s_Q
+               dw    s_R
+               dw    s_S
+               dw    s_T
+               dw    s_U
+               dw    s_V
+               dw    s_W
+               dw    s_X
+               dw    s_Y
+               dw    s_Z
+               dw    s_LBracket
+               dw    s_BackSlash
+               dw    s_RBracket
+               dw    s_Carot
+               dw    s_UnderLine
+
+FontData       =     *
+s_Space        hex   00000000
+               hex   00000000
+               hex   00000000
+               hex   00000000
+               hex   00000000
+               hex   00000000
+
+s_Exclaim      hex   000FF000
+               hex   000FF000
+               hex   000FF000
+               hex   000FF000
+               hex   00000000
+               hex   000FF000
+
+s_Quote        hex   0FF00FF0
+               hex   00F000F0
+               hex   00000000
+               hex   00000000
+               hex   00000000
+               hex   00000000
+
+s_Number       hex   00000000
+               hex   00F00F00
+               hex   0FFFFFF0
+               hex   00F00F00
+               hex   0FFFFFF0
+               hex   00F00F00
+
+s_Dollar       hex   000F0F00
+               hex   00FFFFF0
+               hex   0F0F0F00
+               hex   00FFFF00
+               hex   000F0FF0
+               hex   0FFFFF00
+
+s_Percent      hex   0FF000F0
+               hex   00000F00
+               hex   0000F000
+               hex   000F0000
+               hex   00F00000
+               hex   0F000FF0
+
+s_Amper        hex   000FF000
+               hex   00F00F00
+               hex   0F00F000
+               hex   00F000F0
+               hex   0F0FFF00
+               hex   00F0F000
+
+s_Single       hex   000FF000
+               hex   0000F000
+               hex   00000000
+               hex   00000000
+               hex   00000000
+               hex   00000000
+
+s_OpenParen    hex   000FF000
+               hex   00FF0000
+               hex   0FF00000
+               hex   0FF00000
+               hex   00FF0000
+               hex   000FF000
+
+s_CloseParen   hex   000FF000
+               hex   0000FF00
+               hex   00000FF0
+               hex   00000FF0
+               hex   0000FF00
+               hex   000FF000
+
+
+s_Asterix      hex   00000000
+               hex   00F0F0F0
+               hex   000FFF00
+               hex   00FFFFF0
+               hex   000FFF00
+               hex   00F0F0F0
+
+s_Plus         hex   000F0000
+               hex   000F0000
+               hex   0FFFFF00
+               hex   000F0000
+               hex   000F0000
+               hex   00000000
+
+s_Comma        hex   00000000
+               hex   00000000
+               hex   00000000
+               hex   00000000
+               hex   0000FF00
+               hex   0000F000
+
+s_Minus        hex   00000000
+               hex   00000000
+               hex   0FFFFF00
+               hex   00000000
+               hex   00000000
+               hex   00000000
+
+
+s_Period       hex   00000000
+               hex   00000000
+               hex   00000000
+               hex   00000000
+               hex   0000FF00
+               hex   0000FF00
+
+s_Slash        hex   000000F0
+               hex   00000F00
+               hex   0000F000
+               hex   000F0000
+               hex   00F00000
+               hex   0F000000
+
+s_N0           hex   00FFFF00
+               hex   0F000FF0
+               hex   0F00F0F0
+               hex   0F0F00F0
+               hex   0FF000F0
+               hex   00FFFF00
+
+s_N1           hex   000F0000
+               hex   00FF0000
+               hex   000F0000
+               hex   000F0000
+               hex   000F0000
+               hex   00FFF000
+
+s_N2           hex   00FFFF00
+               hex   0F0000F0
+               hex   00000F00
+               hex   000FF000
+               hex   00F00000
+               hex   0FFFFFF0
+
+s_N3           hex   00FFFF00
+               hex   000000F0
+               hex   000FFF00
+               hex   000000F0
+               hex   000000F0
+               hex   00FFFF00
+
+s_N4           hex   0000FF00
+               hex   000F0F00
+               hex   00F00F00
+               hex   0FFFFFF0
+               hex   00000F00
+               hex   00000F00
+
+s_N5           hex   0FFFFFF0
+               hex   0F000000
+               hex   0FFFFF00
+               hex   000000F0
+               hex   0F0000F0
+               hex   00FFFF00
+
+s_N6           hex   000FFF00
+               hex   00F00000
+               hex   0F000000
+               hex   0FFFFF00
+               hex   0F0000F0
+               hex   00FFFFF0
+
+s_N7           hex   0FFFFFF0
+               hex   000000F0
+               hex   00000F00
+               hex   0000F000
+               hex   000F0000
+               hex   000F0000
+
+s_N8           hex   00FFFF00
+               hex   0F0000F0
+               hex   00FFFF00
+               hex   0F0000F0
+               hex   0F0000F0
+               hex   00FFFF00
+
+s_N9           hex   00FFFF00
+               hex   0F0000F0
+               hex   00FFFF00
+               hex   0000F000
+               hex   000F0000
+               hex   00F00000
+
+s_Colon        hex   000FF000
+               hex   000FF000
+               hex   00000000
+               hex   000FF000
+               hex   000FF000
+               hex   00000000
+
+s_Semi         hex   00000000
+               hex   000FF000
+               hex   000FF000
+               hex   00000000
+               hex   000FF000
+               hex   000F0000
+
+s_LAngle       hex   0000F000
+               hex   000F0000
+               hex   00F00000
+               hex   000F0000
+               hex   0000F000
+               hex   00000000
+
+s_Equal        hex   00000000
+               hex   00000000
+               hex   0FFFFF00
+               hex   00000000
+               hex   0FFFFF00
+               hex   00000000
+
+s_RAngle       hex   0000F000
+               hex   00000F00
+               hex   000000F0
+               hex   00000F00
+               hex   0000F000
+               hex   00000000
+
+s_Question     hex   00FFF000
+               hex   0F000F00
+               hex   00000F00
+               hex   000FF000
+               hex   00000000
+               hex   000FF000
+
+s_At           hex   00FFFF00
+               hex   0F0000F0
+               hex   0F00F0F0
+               hex   0FFFF0F0
+               hex   000000F0
+               hex   0FFFFF00
+
+s_A            hex   000FF000
+               hex   00F00F00
+               hex   0F0000F0
+               hex   0FFFFFF0
+               hex   0F0000F0
+               hex   0F0000F0
+
+s_B            hex   0FFFFF00
+               hex   0F0000F0
+               hex   0FFFFF00
+               hex   0F0000F0
+               hex   0F0000F0
+               hex   0FFFFF00
+
+s_C            hex   00FFFFF0
+               hex   0F000000
+               hex   0F000000
+               hex   0F000000
+               hex   0F000000
+               hex   00FFFFF0
+
+s_D            hex   0FFFFF00
+               hex   0F0000F0
+               hex   0F0000F0
+               hex   0F0000F0
+               hex   0F0000F0
+               hex   0FFFFF00
+
+s_E            hex   0FFFFFF0
+               hex   0F000000
+               hex   0FFFF000
+               hex   0F000000
+               hex   0F000000
+               hex   0FFFFFF0
+
+s_F            hex   0FFFFFF0
+               hex   0F000000
+               hex   0FFFF000
+               hex   0F000000
+               hex   0F000000
+               hex   0F000000
+
+s_G            hex   00FFFFF0
+               hex   0F000000
+               hex   0F000000
+               hex   0F00FFF0
+               hex   0F0000F0
+               hex   00FFFF00
+
+s_H            hex   0F0000F0
+               hex   0F0000F0
+               hex   0FFFFFF0
+               hex   0F0000F0
+               hex   0F0000F0
+               hex   0F0000F0
+
+s_I            hex   0FFFFF00
+               hex   000F0000
+               hex   000F0000
+               hex   000F0000
+               hex   000F0000
+               hex   0FFFFF00
+
+s_J            hex   000000F0
+               hex   000000F0
+               hex   000000F0
+               hex   0F0000F0
+               hex   0F0000F0
+               hex   00FFFF00
+
+s_K            hex   0F000F00
+               hex   0F00F000
+               hex   0FFF0000
+               hex   0F00F000
+               hex   0F000F00
+               hex   0F000F00
+
+s_L            hex   0F000000
+               hex   0F000000
+               hex   0F000000
+               hex   0F000000
+               hex   0F000000
+               hex   0FFFFFF0
+
+s_M            hex   0F0000F0
+               hex   0FF00FF0
+               hex   0F0FF0F0
+               hex   0F0000F0
+               hex   0F0000F0
+               hex   0F0000F0
+
+s_N            hex   0F0000F0
+               hex   0FF000F0
+               hex   0F0F00F0
+               hex   0F00F0F0
+               hex   0F000FF0
+               hex   0F0000F0
+
+s_O            hex   00FFFF00
+               hex   0F0000F0
+               hex   0F0000F0
+               hex   0F0000F0
+               hex   0F0000F0
+               hex   00FFFF00
+
+s_P            hex   0FFFFF00
+               hex   0F0000F0
+               hex   0FFFFF00
+               hex   0F000000
+               hex   0F000000
+               hex   0F000000
+
+s_Q            hex   00FFFF00
+               hex   0F0000F0
+               hex   0F0000F0
+               hex   0F00F0F0
+               hex   0F000FF0
+               hex   00FFFFF0
+
+s_R            hex   0FFFFF00
+               hex   0F0000F0
+               hex   0FFFFF00
+               hex   0F000F00
+               hex   0F0000F0
+               hex   0F0000F0
+
+s_S            hex   00FFFFF0
+               hex   0F000000
+               hex   00FFFF00
+               hex   000000F0
+               hex   000000F0
+               hex   0FFFFF00
+
+s_T            hex   0FFFFF00
+               hex   000F0000
+               hex   000F0000
+               hex   000F0000
+               hex   000F0000
+               hex   000F0000
+
+s_U            hex   0F0000F0
+               hex   0F0000F0
+               hex   0F0000F0
+               hex   0F0000F0
+               hex   0F0000F0
+               hex   00FFFF00
+
+s_V            hex   0F0000F0
+               hex   0F0000F0
+               hex   0F0000F0
+               hex   0F0000F0
+               hex   00F00F00
+               hex   000FF000
+
+s_W            hex   0F0000F0
+               hex   0F0000F0
+               hex   0F0000F0
+               hex   0F0FF0F0
+               hex   0FF00FF0
+               hex   0F0000F0
+
+s_X            hex   0F0000F0
+               hex   00F00F00
+               hex   000FF000
+               hex   000FF000
+               hex   00F00F00
+               hex   0F0000F0
+
+s_Y            hex   F00000F0
+               hex   0F000F00
+               hex   00F0F000
+               hex   000F0000
+               hex   000F0000
+               hex   000F0000
+
+s_Z            hex   0FFFFFF0
+               hex   00000F00
+               hex   0000F000
+               hex   000F0000
+               hex   00F00000
+               hex   0FFFFFF0
+
+s_LBracket     hex   000FFF00
+               hex   000F0000
+               hex   000F0000
+               hex   000F0000
+               hex   000F0000
+               hex   000FFF00
+
+s_BackSlash    hex   0F000000
+               hex   00F00000
+               hex   000F0000
+               hex   0000F000
+               hex   00000F00
+               hex   000000F0
+
+s_RBracket     hex   00FFF000
+               hex   0000F000
+               hex   0000F000
+               hex   0000F000
+               hex   0000F000
+               hex   00FFF000
+
+s_Carot        hex   0000F000
+               hex   000F0F00
+               hex   00F000F0
+               hex   00000000
+               hex   00000000
+               hex   00000000
+
+s_UnderLine    hex   00000000
+               hex   00000000
+               hex   00000000
+               hex   00000000
+               hex   00000000
+               hex   FFFFFFF0
+
+s_Template     hex   00000000
+               hex   00000000
+               hex   00000000
+               hex   00000000
+               hex   00000000
+               hex   00000000
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
diff --git a/demos/tool/package.json b/demos/tool/package.json
new file mode 100644
index 0000000..70528d0
--- /dev/null
+++ b/demos/tool/package.json
@@ -0,0 +1,32 @@
+{
+  "name": "gte-toolbox-demo",
+  "version": "1.0.0",
+  "description": "A testbed for developing a toolbox wrapper around the GTE library",
+  "main": "index.js",
+  "config": {
+    "merlin32": "C:\\Programs\\IIgsXDev\\bin\\Merlin32-1.1.10.exe",
+    "cadius": "C:\\Programs\\IIgsXDev\\bin\\Cadius.exe",
+    "gsport": "C:\\Programs\\gsport\\gsport_0.31\\GSPort.exe",
+    "macros": "../../macros",
+    "crossrunner": "C:\\Programs\\Crossrunner\\Crossrunner.exe"
+  },
+  "scripts": {
+    "test": "npm run build && build-image.bat %npm_package_config_cadius% && %npm_package_config_gsport%",
+    "debug": "%npm_package_config_crossrunner% GTEToolDemo -Source MAINSEG_Output.txt -Debug -CompatibilityLayer -Map App.s",
+    "build": "npm run build:tool && npm run build:sys16",
+    "build:sys16": "%npm_package_config_merlin32% -V %npm_package_config_macros% App.s",
+    "build:tool": "%npm_package_config_merlin32% -V %npm_package_config_macros% ../../src/Master.s"
+  },
+  "repository": {
+    "type": "git",
+    "url": "git+https://github.com/lscharen/iigs-game-engine.git"
+  },
+  "author": "Lucas Scharenbroich",
+  "license": "Apache-2.0",
+  "bugs": {
+    "url": "https://github.com/lscharen/iigs-game-engine/issues"
+  },
+  "homepage": "https://github.com/lscharen/iigs-game-engine#readme",
+  "devDependencies": {
+  }
+}
diff --git a/demos/zelda/.gitignore b/demos/zelda/.gitignore
new file mode 100644
index 0000000..49eb481
--- /dev/null
+++ b/demos/zelda/.gitignore
@@ -0,0 +1 @@
+GTEZelda
\ No newline at end of file
diff --git a/demos/zelda/package-lock.json b/demos/zelda/package-lock.json
index cd11399..2ae2659 100644
--- a/demos/zelda/package-lock.json
+++ b/demos/zelda/package-lock.json
@@ -69,9 +69,9 @@
       "dev": true
     },
     "minimist": {
-      "version": "1.2.5",
-      "resolved": "https://registry.npmjs.org/minimist/-/minimist-1.2.5.tgz",
-      "integrity": "sha512-FM9nNUYrRBAELZQT3xeZQ7fmMOBg6nWNmJKTcgsJeaLstP/UODVpGsr5OhXhhXg6f+qtJ8uiZ+PUxkDWcgIXLw==",
+      "version": "1.2.6",
+      "resolved": "https://registry.npmjs.org/minimist/-/minimist-1.2.6.tgz",
+      "integrity": "sha512-Jsjnk4bw3YJqYzbdyBiNsPWHPfO++UGG749Cxs6peCu5Xg4nrena6OVxOYxrQTqww0Jmwt+Ref8rggumkTLz9Q==",
       "dev": true
     },
     "nan": {
diff --git a/macros/CORE.MACS.S b/macros/CORE.MACS.S
index bb29051..29fe055 100644
--- a/macros/CORE.MACS.S
+++ b/macros/CORE.MACS.S
@@ -325,3 +325,57 @@ transparent
                 sta:  ]3+1,y
 next
                 eom
+
+; Large code blocks that can be used in sprite blitters
+; ]1: line number
+OneSpriteToCodeField mac
+            lda   blttmp+{]1*4}
+            andl  spritemask+{]1*SPRITE_PLANE_SPAN},x
+            oral  spritedata+{]1*SPRITE_PLANE_SPAN},x
+            sta:  $0004+{]1*$1000},y
+
+            lda   blttmp+{]1*4}+2
+            andl  spritemask+{]1*SPRITE_PLANE_SPAN}+2,x
+            oral  spritedata+{]1*SPRITE_PLANE_SPAN}+2,x
+            sta:  $0001+{]1*$1000},y
+            eom
+
+TwoSpritesToCodeField mac
+            ldy   #{]1*SPRITE_PLANE_SPAN}
+            lda   blttmp+{]1*4}
+            andl  [spritemask_1],y
+            oral  [spritedata_1],y
+            andl  [spritemask_0],y
+            oral  [spritedata_0],y
+            sta:  $0004+{]1*$1000},x
+
+            ldy   #{]1*SPRITE_PLANE_SPAN}+2
+            lda   blttmp+{]1*4}+2
+            andl  [spritemask_1],y
+            oral  [spritedata_1],y
+            andl  [spritemask_0],y
+            oral  [spritedata_0],y
+            sta:  $0001+{]1*$1000},x
+            eom
+
+ThreeSpritesToCodeField mac
+            ldy   #{]1*SPRITE_PLANE_SPAN}
+            lda   blttmp+{]1*4}
+            andl  [spritemask_2],y
+            oral  [spritedata_2],y
+            andl  [spritemask_1],y
+            oral  [spritedata_1],y
+            andl  [spritemask_0],y
+            oral  [spritedata_0],y
+            sta:  $0004+{]1*$1000},x
+
+            ldy   #{]1*SPRITE_PLANE_SPAN}+2
+            lda   blttmp+{]1*4}+2
+            andl  [spritemask_2],y
+            oral  [spritedata_2],y
+            andl  [spritemask_1],y
+            oral  [spritedata_1],y
+            andl  [spritemask_0],y
+            oral  [spritedata_0],y
+            sta:  $0001+{]1*$1000},x
+            eom
diff --git a/macros/GTE.Macs.s b/macros/GTE.Macs.s
new file mode 100644
index 0000000..2f64785
--- /dev/null
+++ b/macros/GTE.Macs.s
@@ -0,0 +1,160 @@
+* Generic Tile Engine Macros
+*   by Lucas Scharenbroich
+
+GTEToolNum           equ   $A0
+
+_GTEBootInit         MAC
+                     UserTool  $0100+GTEToolNum
+                     <<<
+_GTEStartUp          MAC
+                     UserTool  $0200+GTEToolNum
+                     <<<
+_GTEShutDown         MAC
+                     UserTool  $0300+GTEToolNum
+                     <<<
+_GTEVersion          MAC
+                     UserTool  $0400+GTEToolNum
+                     <<<
+_GTEReset            MAC
+                     UserTool  $0500+GTEToolNum
+                     <<<
+_GTEStatus           MAC
+                     UserTool  $0600+GTEToolNum
+                     <<<
+_GTEReadControl      MAC
+                     UserTool  $0900+GTEToolNum
+                     <<<
+_GTESetScreenMode    MAC
+                     UserTool  $0A00+GTEToolNum
+                     <<<
+_GTESetTile          MAC
+                     UserTool  $0B00+GTEToolNum
+                     <<<
+_GTESetBG0Origin     MAC
+                     UserTool  $0C00+GTEToolNum
+                     <<<
+_GTERender           MAC
+                     UserTool  $0D00+GTEToolNum
+                     <<<
+_GTELoadTileSet      MAC
+                     UserTool  $0E00+GTEToolNum
+                     <<<
+_GTECreateSpriteStamp MAC
+                     UserTool  $0F00+GTEToolNum
+                     <<<
+_GTEAddSprite        MAC
+                     UserTool  $1000+GTEToolNum
+                     <<<
+_GTEMoveSprite       MAC
+                     UserTool  $1100+GTEToolNum
+                     <<<
+_GTEUpdateSprite     MAC
+                     UserTool  $1200+GTEToolNum
+                     <<<
+_GTERemoveSprite     MAC
+                     UserTool  $1300+GTEToolNum
+                     <<<
+_GTEGetSeconds       MAC
+                     UserTool  $1400+GTEToolNum
+                     <<<
+_GTECopyTileToDynamic MAC
+                      UserTool  $1500+GTEToolNum
+                      <<<
+_GTESetPalette       MAC
+                     UserTool  $1600+GTEToolNum
+                     <<<
+_GTECopyPicToBG1     MAC
+                     UserTool  $1700+GTEToolNum
+                     <<<
+_GTEBindSCBArray     MAC
+                     UserTool  $1800+GTEToolNum
+                     <<<
+_GTEGetBG0TileMapInfo MAC
+                     UserTool  $1900+GTEToolNum
+                     <<<
+_GTEGetScreenInfo    MAC
+                     UserTool  $1A00+GTEToolNum
+                     <<<
+_GTESetBG1Origin     MAC
+                     UserTool  $1B00+GTEToolNum
+                     <<<
+_GTEGetTileAt        MAC
+                     UserTool  $1C00+GTEToolNum
+                     <<<                     
+_GTESetBG0TileMapInfo MAC
+                     UserTool  $1D00+GTEToolNum
+                     <<<
+_GTESetBG1TileMapInfo MAC
+                     UserTool  $1E00+GTEToolNum
+                     <<<
+_GTEAddTimer         MAC
+                     UserTool  $1F00+GTEToolNum
+                     <<<
+_GTERemoveTimer      MAC
+                     UserTool  $2000+GTEToolNum
+                     <<<
+_GTEStartScript      MAC
+                     UserTool  $2100+GTEToolNum
+                     <<<
+_GTESetOverlay       MAC
+                     UserTool  $2200+GTEToolNum
+                     <<<
+_GTEClearOverlay     MAC
+                     UserTool  $2300+GTEToolNum
+                     <<<
+_GTEGetTileDataAddr  MAC
+                     UserTool  $2400+GTEToolNum
+                     <<<
+_GTEFillTileStore    MAC
+                     UserTool  $2500+GTEToolNum
+                     <<<
+_GTERefresh          MAC
+                     UserTool  $2600+GTEToolNum
+                     <<<
+
+; EngineMode definitions
+; Script definition
+YIELD                  equ   $8000
+JUMP                   equ   $4000
+
+SET_PALETTE_ENTRY      equ   $0002
+SWAP_PALETTE_ENTRY     equ   $0004
+SET_DYN_TILE           equ   $0006
+CALLBACK               equ   $0010
+
+; ReadControl return value bits
+PAD_BUTTON_B           equ   $01
+PAD_BUTTON_A           equ   $02
+PAD_KEY_DOWN           equ   $04
+ENGINE_MODE_TWO_LAYER  equ   $0001
+ENGINE_MODE_DYN_TILES  equ   $0002
+ENGINE_MODE_BNK0_BUFF  equ   $0004
+
+; Tile constants
+; TILE_RESERVED_BIT      equ   $8000
+TILE_PRIORITY_BIT      equ   $4000                  ; Put tile on top of sprite
+TILE_FRINGE_BIT        equ   $2000                  ; Unused
+TILE_SOLID_BIT         equ   $1000                  ; Hint bit used in TWO_LAYER_MODE to optimize rendering
+TILE_DYN_BIT           equ   $0800                  ; Is this a Dynamic Tile?
+TILE_VFLIP_BIT         equ   $0400
+TILE_HFLIP_BIT         equ   $0200
+TILE_ID_MASK           equ   $01FF
+TILE_CTRL_MASK         equ   $FE00
+
+
+; Sprite constants
+SPRITE_HIDE            equ   $2000
+SPRITE_16X16           equ   $1800
+SPRITE_16X8            equ   $1000
+SPRITE_8X16            equ   $0800
+SPRITE_8X8             equ   $0000
+SPRITE_VFLIP           equ   $0400
+SPRITE_HFLIP           equ   $0200
+
+; Stamp storage parameters
+VBUFF_STRIDE_BYTES     equ {12*4}                        ; Each line has 4 slots of 16 pixels + 8 buffer pixels
+VBUFF_TILE_ROW_BYTES   equ {8*VBUFF_STRIDE_BYTES}        ; Each row is comprised of 8 lines
+VBUFF_TILE_COL_BYTES   equ 4
+VBUFF_SPRITE_STEP      equ {VBUFF_TILE_ROW_BYTES*3}      ; Allocate space for 16 rows + 8 rows of buffer
+VBUFF_SPRITE_START     equ {VBUFF_TILE_ROW_BYTES+4}      ; Start at an offset so $0000 can be used as an empty value
+VBUFF_SLOT_COUNT       equ 48                            ; Have space for this many stamps
diff --git a/package.json b/package.json
new file mode 100644
index 0000000..711ed14
--- /dev/null
+++ b/package.json
@@ -0,0 +1,32 @@
+{
+  "name": "generic-tile-engine",
+  "version": "1.0.0",
+  "description": "A tile-base game engine for the Apple IIgs",
+  "main": "index.js",
+  "config": {
+    "merlin32": "C:\\Programs\\IIgsXDev\\bin\\Merlin32-1.1.10.exe",
+    "cadius": "C:\\Programs\\IIgsXDev\\bin\\Cadius.exe",
+    "gsport": "C:\\Programs\\gsport\\gsport_0.31\\GSPort.exe",
+    "macros": "./macros",
+    "crossrunner": "C:\\Programs\\Crossrunner\\Crossrunner.exe"
+  },
+  "scripts": {
+    "archive": "%npm_package_config_cadius% EXTRACTFILE ./emu/Target.2mg /GTEDev/Tool160.SHK .",
+    "test": "npm run build && build-image.bat %npm_package_config_cadius% && %npm_package_config_gsport%",
+    "build": "%npm_package_config_merlin32% -V %npm_package_config_macros% ./src/Master.s",
+    "build:debug": "%npm_package_config_merlin32% -V %npm_package_config_macros% ./src/Debug.s",
+    "debug": "%npm_package_config_crossrunner% ./src/Debug160 -Source ./src/Debug160_S02__Output.txt -Debug -CompatibilityLayer"
+  },
+  "repository": {
+    "type": "git",
+    "url": "git+https://github.com/lscharen/iigs-game-engine.git"
+  },
+  "author": "Lucas Scharenbroich",
+  "license": "Apache-2.0",
+  "bugs": {
+    "url": "https://github.com/lscharen/iigs-game-engine/issues"
+  },
+  "homepage": "https://github.com/lscharen/iigs-game-engine#readme",
+  "devDependencies": {
+  }
+}
diff --git a/src/Core.s b/src/Core.s
index 3b2a66d..f102699 100644
--- a/src/Core.s
+++ b/src/Core.s
@@ -8,94 +8,6 @@
 
                   use       .\Defs.s
 
-; Feature flags
-NO_INTERRUPTS     equ       1                   ; turn off for crossrunner debugging
-NO_MUSIC          equ       1                   ; turn music + tool loading off
-
-; External data space provided by the main program segment
-tiledata          EXT
-TileStore         EXT
-
-; Sprite plane data and mask banks are provided as an exteral segment
-;
-; The sprite data holds a set of pre-rendered sprites that are optimized to support the rendering pipeline.  There
-; are four copies of each sprite, along with the cooresponding mask laid out into 4x4 tile regions where the
-; empty row and column is shared between adjacent blocks.
-;
-; Logically, the memory is laid out as 4 columns of sprites and 4 rows.
-;
-; +---+---+---+---+---+---+---+---+---+---+---+---+-...
-; |   |   |   |   |   |   |   |   |   |   |   |   | ...
-; +---+---+---+---+---+---+---+---+---+---+---+---+-...
-; |   | 0 | 0 |   | 1 | 1 |   | 2 | 2 |   | 3 | 3 | ...
-; +---+---+---+---+---+---+---+---+---+---+---+---+-...
-; |   | 0 | 0 |   | 1 | 1 |   | 2 | 2 |   | 3 | 3 | ...
-; +---+---+---+---+---+---+---+---+---+---+---+---+-...
-; |   |   |   |   |   |   |   |   |   |   |   |   | ...
-; +---+---+---+---+---+---+---+---+---+---+---+---+-...
-; |   | 4 | 4 |   | 5 | 5 |   | 6 | 6 |   | 7 | 7 | ...
-; +---+---+---+---+---+---+---+---+---+---+---+---+-...
-; |   | 4 | 4 |   | 5 | 5 |   | 6 | 6 |   | 7 | 7 | ...
-; +---+---+---+---+---+---+---+---+---+---+---+---+-...
-; |   |   |   |   |   |   |   |   |   |   |   |   | ...
-; +---+---+---+---+---+---+---+---+---+---+---+---+-...
-;
-; For each sprite, when it needs to be copied into an on-screen tile, it could exist at any offset compared to its
-; natural alignment.  By having a buffer around the sprite data, an address pointer can be set to a different origin
-; and a simple 8x8 block copy can cut out the appropriate bit of the sprite.  For example, here is a zoomed-in look
-; at a sprite with an offset, O, at (-2,-3).  As shown, by selecting an appropriate origin, just the top corner
-; of the sprite data will be copied.
-;
-; +---+---+---+---++---+---+---+---++---+---+---+---++---+---+---+---+..
-; |   |           ||           |   ||   |   |   |   ||   |   |   |   |
-; +---+-- O----------------+ --+---++---+---+---+---++---+---+---+---+..
-; |   |   |                |   |   ||   |   |   |   ||   |   |   |   |
-; +---+-- |                | --+---++---+---+---+---++---+---+---+---+..
-; |   |   |                |   |   ||   |   |   |   ||   |   |   |   |
-; +---+-- |                | --+---++---+---+---+---++---+---+---+---+..
-; |   |   |                |   |   ||   |   |   |   ||   |   |   |   |
-; +===+== |       ++===+== | ==+===++===+===+===+===++===+===+===+===+..
-; |   |   |       ||   | S | S | S || S | S | S |   ||   |   |   |   |
-; +---+-- +----------------+ --+---++---+---+---+---++---+---+---+---+..
-; |   |           || S | S   S | S || S | S | S | S ||   |   |   |   |
-; +---+---+---+---++---+---+---+---++---+---+---+---++---+---+---+---+..
-; |   |   |   |   || S | S | S | S || S | S | S | S ||   |   |   |   |
-; +---+---+---+---++---+---+---+---++---+---+---+---++---+---+---+---+..
-; |   |   |   |   || S | S | S | S || S | S | S | S ||   |   |   |   |
-; +===+===+===+===++===+===+===+===++===+===+===+===++===+===+===+===+..
-; |   |   |   |   || S | S | S | S || S | S | S | S ||   |   |   |   |
-; +---+---+---+---++---+---+---+---++---+---+---+---++---+---+---+---+..
-; |   |   |   |   || S | S | S | S || S | S | S | S ||   |   |   |   |
-; +---+---+---+---++---+---+---+---++---+---+---+---++---+---+---+---+..
-; |   |   |   |   || S | S | S | S || S | S | S | S ||   |   |   |   |
-; +---+---+---+---++---+---+---+---++---+---+---+---++---+---+---+---+..
-; |   |   |   |   ||   | S | S | S || S | S | S |   ||   |   |   |   |
-; +---+---+---+---++---+---+---+---++---+---+---+---++---+---+---+---+..
-; .   .   .   .   .   .   .   .   .   .   .   .   .   .   .   .   .
-;
-; Each sprite will take up, effectively 9 tiles of storage space per 
-; instance (plus edges) and there are 4 instances for the H/V bits
-; and 4 more for the masks.  This results in a need for 43,264 bytes
-; for all 16 sprites.
-
-spritedata        EXT
-spritemask        EXT
-
-; If there are overlays, they are provided as an external
-Overlay           EXT
-
-; Core engine functionality.  The idea is that that source file can be PUT into
-; a main source file and all of the functionality will be available.
-;
-; There are some constancts that must be externally defined that can affect how
-; the GTE runtime works
-;
-; NO_MUSIC      : Set to non-zero to avoid using any source
-; NO_INTERRUPTS : Set to non-zero to avoid installing custom interrupt handlers
-
-                  mx        %00
-
-; High-Level StartUp and ShutDown functions
 EngineStartUp     ENT
                   phb
                   phk
@@ -103,41 +15,23 @@ EngineStartUp     ENT
 
                   jsr       ToolStartUp         ; Start up the toolbox tools we rely on
                   jsr       _CoreStartUp
+                  jsr       SoundStartUp        ; Start up any sound/music tools
 
                   plb
                   rtl
 
-_CoreStartUp
-                  jsr       SoundStartUp        ; Start up any sound/music tools
-                  jsr       IntStartUp          ; Enable certain iterrupts
-
-                  jsr       InitMemory          ; Allocate and initialize memory for the engine
-                  jsr       EngineReset         ; All of the resources are allocated, put the engine in a known state
-
-                  jsr       InitGraphics        ; Initialize all of the graphics-related data
-                  nop
-                  jsr       InitSprites         ; Initialize the sprite subsystem
-                  jsr       InitTiles           ; Initialize the tile subsystem
-
-                  jsr       InitTimers          ; Initialize the timer subsystem
-                  rts
-
 EngineShutDown    ENT
                   phb
                   phk
                   plb
 
+                  jsr       SoundShutDown
                   jsr       _CoreShutDown
                   jsr       ToolShutDown
 
                   plb
                   rtl
 
-_CoreShutDown
-                  jsr       IntShutDown
-                  jsr       SoundShutDown
-                  rts
-
 ToolStartUp
                   _TLStartUp                    ; normal tool initialization
                   pha
@@ -152,7 +46,6 @@ ToolStartUp
                   rts
 
 MasterId          ds        2
-UserId            ds        2
 
 ; Fatal error handler invoked by the _Err macro
 PgmDeath          tax
@@ -168,9 +61,6 @@ PgmDeath0         pha
 ContDeath         ldx       #$1503
                   jsl       $E10000
 
-ToolShutDown
-                  rts
-
 ; Use Tool222 (NinjaTrackerPlus) for music playback
 SoundStartUp
                   lda       #NO_MUSIC
@@ -194,299 +84,10 @@ SoundShutDown
 :no_music
                   rts
 
-; Install interrupt handlers.  We use the VBL interrupt to keep animations
-; moving at a consistent rate, regarless of the rendered frame rate.  The 
-; one-second timer is generally just used for counters and as a handy 
-; frames-per-second trigger.
-IntStartUp
-                  lda       #NO_INTERRUPTS
-                  bne       :no_interrupts
-                  PushLong  #0
-                  pea       $0015               ; Get the existing 1-second interrupt handler and save
-                  _GetVector
-                  PullLong  OldOneSecVec
-
-                  pea       $0015               ; Set the new handler and enable interrupts
-                  PushLong  #OneSecHandler
-                  _SetVector
-
-                  pea       $0006
-                  _IntSource
-
-                  PushLong  #VBLTASK            ; Also register a Heart Beat Task
-                  _SetHeartBeat
-
-:no_interrupts
-                  rts
-
-IntShutDown
-                  lda       #NO_INTERRUPTS
-                  bne       :no_interrupts
-
-                  pea       $0007               ; disable 1-second interrupts
-                  _IntSource
-
-                  PushLong  #VBLTASK            ; Remove our heartbeat task
-                  _DelHeartBeat
-
-                  pea       $0015
-                  PushLong  OldOneSecVec        ; Reset the interrupt vector
-                  _SetVector
-
-:no_interrupts
-                  rts
-
-
-; Interrupt handlers. We install a heartbeat (1/60th second and a 1-second timer)
-OneSecHandler     mx        %11
-                  phb
-                  pha
-                  phk
-                  plb
-
-                  rep       #$20
-                  inc       OneSecondCounter
-                  sep       #$20
-
-                  ldal      $E0C032
-                  and       #%10111111          ;clear IRQ source
-                  stal      $E0C032
-
-                  pla
-                  plb
-                  clc
-                  rtl
-                  mx        %00
-
-OneSecondCounter  ENT
-                  dw        0
-OldOneSecVec      ds        4
-
-VBLTASK           hex       00000000
-                  dw        0
-                  hex       5AA5
-
-; Reset the engine to a known state
-; Blitter initialization
-EngineReset
-                  stz       ScreenHeight
-                  stz       ScreenWidth
-                  stz       ScreenY0
-                  stz       ScreenY1
-                  stz       ScreenX0
-                  stz       ScreenX1
-                  stz       ScreenTileHeight
-                  stz       ScreenTileWidth
-                  stz       StartX
-                  stz       OldStartX
-                  stz       StartXMod164
-
-                  stz       StartY
-                  stz       OldStartY
-                  stz       StartYMod208
-
-                  stz       EngineMode
-                  stz       DirtyBits
-                  stz       LastRender
-                  stz       LastPatchOffset
-                  stz       BG1StartX
-                  stz       BG1StartXMod164
-                  stz       BG1StartY
-                  stz       BG1StartYMod208
-                  stz       BG1OffsetIndex
-
-                  stz       BG0TileOriginX
-                  stz       BG0TileOriginY
-                  stz       OldBG0TileOriginX
-                  stz       OldBG0TileOriginY
-
-                  stz       BG1TileOriginX
-                  stz       BG1TileOriginY
-                  stz       OldBG1TileOriginX
-                  stz       OldBG1TileOriginY
-
-                  stz       TileMapWidth
-                  stz       TileMapHeight
-                  stz       TileMapPtr
-                  stz       TileMapPtr+2
-                  stz       FringeMapPtr
-                  stz       FringeMapPtr+2
-
-                  stz       BG1TileMapWidth
-                  stz       BG1TileMapHeight
-                  stz       BG1TileMapPtr
-                  stz       BG1TileMapPtr+2
-
-                  stz       SCBArrayPtr
-                  stz       SCBArrayPtr+2
-
-                  stz       SpriteBanks
-                  stz       SpriteMap
-                  stz       ActiveSpriteCount
-
-                  stz       OneSecondCounter
-
-                  lda       #13
-                  sta       tmp15
-                  stz       tmp14
-
-:loop
-                  ldx       #BlitBuff
-                  lda       #^BlitBuff
-                  ldy       tmp14
-                  jsr       BuildBank
-
-                  lda       tmp14
-                  clc
-                  adc       #4
-                  sta       tmp14
-
-                  dec       tmp15
-                  bne       :loop
-
-                  rts
-
-; Allow the user to dynamically select one of the pre-configured screen sizes, or pass
-; in a specific width and height.  The screen is automatically centered.  If this is
-; not desired, then SetScreenRect should be used directly
-;
-;  0. Full Screen           : 40 x 25   320 x 200 (32,000 bytes (100.0%)) 
-;  1. Sword of Sodan        : 34 x 24   272 x 192 (26,112 bytes ( 81.6%))
-;  2. ~NES                  : 32 x 25   256 x 200 (25,600 bytes ( 80.0%))
-;  3. Task Force            : 32 x 22   256 x 176 (22,528 bytes ( 70.4%))
-;  4. Defender of the World : 35 x 20   280 x 160 (22,400 bytes ( 70.0%))
-;  5. Rastan                : 32 x 20   256 x 160 (20,480 bytes ( 64.0%))
-;  6. Game Boy Advanced     : 30 x 20   240 x 160 (19,200 bytes ( 60.0%))
-;  7. Ancient Land of Y's   : 36 x 16   288 x 128 (18,432 bytes ( 57.6%))
-;  8. Game Boy Color        : 20 x 18   160 x 144 (11,520 bytes ( 36.0%))
-;  9. Agony (Amiga)         : 36 x 24   288 x 192 (27,648 bytes ( 86.4%))
-; 10. Atari Lynx            : 20 x 13   160 x 102 (8,160 bytes  ( 25.5%))
-;
-;  X = mode number OR width in pixels (must be multiple of 2)
-;  Y = height in pixels (if X > 8)
-
-ScreenModeWidth   dw        320,272,256,256,280,256,240,288,160,288,160,320
-ScreenModeHeight  dw        200,192,200,176,160,160,160,128,144,192,102,1
-
-SetScreenMode     ENT
-                  phb
-                  phk
-                  plb
-                  jsr       _SetScreenMode
-                  plb
-                  rtl
-
-_SetScreenMode
-                  cpx       #11
-                  bcs       :direct             ; if x > 10, then assume X and Y are the dimensions
-
-                  txa
-                  asl
-                  tax
-
-                  ldy       ScreenModeHeight,x
-                  lda       ScreenModeWidth,x
-                  tax
-
-:direct           cpy       #201
-                  bcs       :exit
-
-                  cpx       #321
-                  bcs       :exit
-
-                  txa
-                  lsr
-                  pha                           ; Save X (width / 2) and Y (height)
-                  phy
-
-                  lda       #160                ; Center the screen
-                  sec
-                  sbc       3,s
-                  lsr
-                  xba
-                  pha                           ; Save half the origin coordinate
-
-                  lda       #200
-                  sec
-                  sbc       3,s                 ; This is now Y because of the PHA above
-                  lsr
-                  ora       1,s
-
-                  plx                           ; Throw-away to pop the stack
-                  ply
-                  plx
-
-                  jsr       SetScreenRect
-                  jmp       FillScreen          ; tail return
-:exit
-                  rts
-
-
-WaitForKey        sep       #$20
-                  stal      KBD_STROBE_REG      ; clear the strobe
-:WFK              ldal      KBD_REG
-                  bpl       :WFK
-                  rep       #$20
-                  and       #$007F
-                  rts
-
-ClearKbdStrobe    sep       #$20
-                  stal      KBD_STROBE_REG
-                  rep       #$20
-                  rts
-
-; Read the keyboard and paddle controls and return in a game-controller-like format
-LastKey           db        0
-ReadControl       ENT
-                  jsr       _ReadControl
-                  rtl
-
-_ReadControl      
-                  pea       $0000               ; low byte = key code, high byte = %------AB 
-
-                  sep       #$20
-                  ldal      OPTION_KEY_REG      ; 'B' button
-                  and       #$80
-                  beq       :BNotDown
-
-                  lda       #PAD_BUTTON_B
-                  ora       2,s
-                  sta       2,s
-
-:BNotDown
-                  ldal      COMMAND_KEY_REG
-                  and       #$80
-                  beq       :ANotDown
-
-                  lda       #PAD_BUTTON_A
-                  ora       2,s
-                  sta       2,s
-
-:ANotDown
-                  ldal      KBD_STROBE_REG      ; read the keyboard
-                  bit       #$80
-                  beq       :KbdNotDwn          ; check the key-down status
-                  and       #$7f
-                  ora       1,s
-                  sta       1,s
-
-                  cmpl      LastKey
-                  beq       :KbdDown
-                  stal      LastKey
-
-                  lda       #PAD_KEY_DOWN       ; set the keydown flag
-                  ora       2,s
-                  sta       2,s
-                  bra       :KbdDown
-
-:KbdNotDwn
-                  lda       #0
-                  stal      LastKey
-:KbdDown
-                  rep       #$20
-                  pla
+ToolShutDown
                   rts
 
+                  put       CoreImpl.s
                   put       blitter/Template.s
 
                   put       Memory.s
diff --git a/src/CoreImpl.s b/src/CoreImpl.s
new file mode 100644
index 0000000..fc1dd8c
--- /dev/null
+++ b/src/CoreImpl.s
@@ -0,0 +1,353 @@
+; Feature flags
+NO_INTERRUPTS     equ       0                   ; turn off for crossrunner debugging
+NO_MUSIC          equ       1                   ; turn music + tool loading off
+
+; External data space provided by the main program segment
+tiledata          EXT
+TileStore         EXT
+
+; Sprite plane data and mask banks are provided as an external segment
+;
+; The sprite data holds a set of pre-rendered sprites that are optimized to support the rendering pipeline.  There
+; are four copies of each sprite, along with the cooresponding mask laid out into 4x4 tile regions where the
+; empty row and column is shared between adjacent blocks.
+;
+; Logically, the memory is laid out as 4 columns of sprites and 4 rows.
+;
+; +---+---+---+---+---+---+---+---+---+---+---+---+-...
+; |   |   |   |   |   |   |   |   |   |   |   |   | ...
+; +---+---+---+---+---+---+---+---+---+---+---+---+-...
+; |   | 0 | 0 |   | 1 | 1 |   | 2 | 2 |   | 3 | 3 | ...
+; +---+---+---+---+---+---+---+---+---+---+---+---+-...
+; |   | 0 | 0 |   | 1 | 1 |   | 2 | 2 |   | 3 | 3 | ...
+; +---+---+---+---+---+---+---+---+---+---+---+---+-...
+; |   |   |   |   |   |   |   |   |   |   |   |   | ...
+; +---+---+---+---+---+---+---+---+---+---+---+---+-...
+; |   | 4 | 4 |   | 5 | 5 |   | 6 | 6 |   | 7 | 7 | ...
+; +---+---+---+---+---+---+---+---+---+---+---+---+-...
+; |   | 4 | 4 |   | 5 | 5 |   | 6 | 6 |   | 7 | 7 | ...
+; +---+---+---+---+---+---+---+---+---+---+---+---+-...
+; |   |   |   |   |   |   |   |   |   |   |   |   | ...
+; +---+---+---+---+---+---+---+---+---+---+---+---+-...
+;
+; For each sprite, when it needs to be copied into an on-screen tile, it could exist at any offset compared to its
+; natural alignment.  By having a buffer around the sprite data, an address pointer can be set to a different origin
+; and a simple 8x8 block copy can cut out the appropriate bit of the sprite.  For example, here is a zoomed-in look
+; at a sprite with an offset, O, at (-2,-3).  As shown, by selecting an appropriate origin, just the top corner
+; of the sprite data will be copied.
+;
+; +---+---+---+---++---+---+---+---++---+---+---+---++---+---+---+---+..
+; |   |           ||           |   ||   |   |   |   ||   |   |   |   |
+; +---+-- O----------------+ --+---++---+---+---+---++---+---+---+---+..
+; |   |   |                |   |   ||   |   |   |   ||   |   |   |   |
+; +---+-- |                | --+---++---+---+---+---++---+---+---+---+..
+; |   |   |                |   |   ||   |   |   |   ||   |   |   |   |
+; +---+-- |                | --+---++---+---+---+---++---+---+---+---+..
+; |   |   |                |   |   ||   |   |   |   ||   |   |   |   |
+; +===+== |       ++===+== | ==+===++===+===+===+===++===+===+===+===+..
+; |   |   |       ||   | S | S | S || S | S | S |   ||   |   |   |   |
+; +---+-- +----------------+ --+---++---+---+---+---++---+---+---+---+..
+; |   |           || S | S   S | S || S | S | S | S ||   |   |   |   |
+; +---+---+---+---++---+---+---+---++---+---+---+---++---+---+---+---+..
+; |   |   |   |   || S | S | S | S || S | S | S | S ||   |   |   |   |
+; +---+---+---+---++---+---+---+---++---+---+---+---++---+---+---+---+..
+; |   |   |   |   || S | S | S | S || S | S | S | S ||   |   |   |   |
+; +===+===+===+===++===+===+===+===++===+===+===+===++===+===+===+===+..
+; |   |   |   |   || S | S | S | S || S | S | S | S ||   |   |   |   |
+; +---+---+---+---++---+---+---+---++---+---+---+---++---+---+---+---+..
+; |   |   |   |   || S | S | S | S || S | S | S | S ||   |   |   |   |
+; +---+---+---+---++---+---+---+---++---+---+---+---++---+---+---+---+..
+; |   |   |   |   || S | S | S | S || S | S | S | S ||   |   |   |   |
+; +---+---+---+---++---+---+---+---++---+---+---+---++---+---+---+---+..
+; |   |   |   |   ||   | S | S | S || S | S | S |   ||   |   |   |   |
+; +---+---+---+---++---+---+---+---++---+---+---+---++---+---+---+---+..
+; .   .   .   .   .   .   .   .   .   .   .   .   .   .   .   .   .
+;
+; Each sprite will take up, effectively 9 tiles of storage space per 
+; instance (plus edges) and there are 4 instances for the H/V bits
+; and 4 more for the masks.  This results in a need for 43,264 bytes
+; for all 16 sprites.
+
+spritedata        EXT
+spritemask        EXT
+
+; Core engine functionality.  The idea is that that source file can be PUT into
+; a main source file and all of the functionality will be available.
+;
+; There are some constancts that must be externally defined that can affect how
+; the GTE runtime works
+;
+; NO_MUSIC      : Set to non-zero to avoid using any source
+; NO_INTERRUPTS : Set to non-zero to avoid installing custom interrupt handlers
+
+                  mx        %00
+
+; Assumes the direct page is set and EngineMode and UserId has been initialized
+_CoreStartUp
+                  jsr       IntStartUp          ; Enable certain interrupts
+
+                  jsr       InitMemory          ; Allocate and initialize memory for the engine
+                  jsr       EngineReset         ; All of the resources are allocated, put the engine in a known state
+
+                  jsr       InitGraphics        ; Initialize all of the graphics-related data
+                  jsr       InitSprites         ; Initialize the sprite subsystem
+                  jsr       InitTiles           ; Initialize the tile subsystem
+
+                  jsr       InitTimers          ; Initialize the timer subsystem
+                  rts
+
+_CoreShutDown
+                  jsr       IntShutDown
+                  rts
+
+; Install interrupt handlers.  We use the VBL interrupt to keep animations
+; moving at a consistent rate, regarless of the rendered frame rate.  The 
+; one-second timer is generally just used for counters and as a handy 
+; frames-per-second trigger.
+IntStartUp
+                  lda       #NO_INTERRUPTS
+                  bne       :no_interrupts
+                  PushLong  #0
+                  pea       $0015               ; Get the existing 1-second interrupt handler and save
+                  _GetVector
+                  PullLong  OldOneSecVec
+
+                  pea       $0015               ; Set the new handler and enable interrupts
+                  PushLong  #OneSecHandler
+                  _SetVector
+
+                  pea       $0006
+                  _IntSource
+
+                  PushLong  #VBLTASK            ; Also register a Heart Beat Task
+                  _SetHeartBeat
+
+:no_interrupts
+                  rts
+
+IntShutDown
+                  lda       #NO_INTERRUPTS
+                  bne       :no_interrupts
+
+                  pea       $0007               ; disable 1-second interrupts
+                  _IntSource
+
+                  PushLong  #VBLTASK            ; Remove our heartbeat task
+                  _DelHeartBeat
+
+                  pea       $0015
+                  PushLong  OldOneSecVec        ; Reset the interrupt vector
+                  _SetVector
+
+:no_interrupts
+                  rts
+
+
+; Interrupt handlers. We install a heartbeat (1/60th second and a 1-second timer)
+OneSecHandler     mx        %11
+                  phb
+                  pha
+
+                  jsr       _SetDataBank
+
+                  rep       #$20
+                  inc       OneSecondCounter
+                  sep       #$20
+
+                  ldal      $E0C032
+                  and       #%10111111          ;clear IRQ source
+                  stal      $E0C032
+
+                  pla
+                  plb
+                  clc
+                  rtl
+                  mx        %00
+
+; This is OK, it's referenced by a long address
+VBLTASK           hex       00000000
+                  dw        0
+                  hex       5AA5
+
+; Reset the engine to a known state
+; Blitter initialization
+EngineReset
+                  stz       ScreenHeight
+                  stz       ScreenWidth
+                  stz       ScreenY0
+                  stz       ScreenY1
+                  stz       ScreenX0
+                  stz       ScreenX1
+                  stz       ScreenTileHeight
+                  stz       ScreenTileWidth
+                  stz       StartX
+                  stz       OldStartX
+                  stz       StartXMod164
+
+                  stz       StartY
+                  stz       OldStartY
+                  stz       StartYMod208
+
+;                  stz       EngineMode
+                  stz       DirtyBits
+                  stz       LastRender
+                  stz       LastPatchOffset
+                  stz       BG1StartX
+                  stz       BG1StartXMod164
+                  stz       BG1StartY
+                  stz       BG1StartYMod208
+                  stz       BG1OffsetIndex
+
+                  stz       BG0TileOriginX
+                  stz       BG0TileOriginY
+                  stz       OldBG0TileOriginX
+                  stz       OldBG0TileOriginY
+
+                  stz       BG1TileOriginX
+                  stz       BG1TileOriginY
+                  stz       OldBG1TileOriginX
+                  stz       OldBG1TileOriginY
+
+                  stz       TileMapWidth
+                  stz       TileMapHeight
+                  stz       TileMapPtr
+                  stz       TileMapPtr+2
+                  stz       FringeMapPtr
+                  stz       FringeMapPtr+2
+
+                  stz       BG1TileMapWidth
+                  stz       BG1TileMapHeight
+                  stz       BG1TileMapPtr
+                  stz       BG1TileMapPtr+2
+
+                  stz       SCBArrayPtr
+                  stz       SCBArrayPtr+2
+
+                  stz       SpriteBanks
+                  stz       SpriteMap
+                  stz       ActiveSpriteCount
+
+                  stz       OneSecondCounter
+
+                  lda       #13
+                  sta       tmp15
+                  stz       tmp14
+
+:loop
+                  ldx       #BlitBuff
+                  lda       #^BlitBuff
+                  ldy       tmp14
+                  jsr       BuildBank
+
+                  lda       tmp14
+                  clc
+                  adc       #4
+                  sta       tmp14
+
+                  dec       tmp15
+                  bne       :loop
+
+                  rts
+
+
+WaitForKey        sep       #$20
+                  stal      KBD_STROBE_REG      ; clear the strobe
+:WFK              ldal      KBD_REG
+                  bpl       :WFK
+                  rep       #$20
+                  and       #$007F
+                  rts
+
+ClearKbdStrobe    sep       #$20
+                  stal      KBD_STROBE_REG
+                  rep       #$20
+                  rts
+
+; Read the keyboard and paddle controls and return in a game-controller-like format
+_ReadControl      pea       $0000               ; low byte = key code, high byte = %------AB 
+
+                  sep       #$20
+                  ldal      OPTION_KEY_REG      ; 'B' button
+                  and       #$80
+                  beq       :BNotDown
+
+                  lda       #PAD_BUTTON_B
+                  ora       2,s
+                  sta       2,s
+
+:BNotDown
+                  ldal      COMMAND_KEY_REG
+                  and       #$80
+                  beq       :ANotDown
+
+                  lda       #PAD_BUTTON_A
+                  ora       2,s
+                  sta       2,s
+
+:ANotDown
+                  ldal      KBD_STROBE_REG      ; read the keyboard
+                  bit       #$80
+                  beq       :KbdNotDwn          ; check the key-down status
+                  and       #$7f
+                  ora       1,s
+                  sta       1,s
+
+                  cmp       LastKey
+                  beq       :KbdDown
+                  sta       LastKey
+
+                  lda       #PAD_KEY_DOWN       ; set the keydown flag
+                  ora       2,s
+                  sta       2,s
+                  bra       :KbdDown
+
+:KbdNotDwn
+                  stz       LastKey
+:KbdDown
+                  rep       #$20
+                  pla
+                  rts
+
+
+; Helper function to take a local pixel coordinate [0, ScreenWidth-1],[0, ScreenHeight-1] and return the
+; row and column in the tile store that is corresponds to.  This takes into consideration the StartX and
+; StartY offsets.
+;
+; This is more specialized than the code in the _MarkDirtySprite routine below since it does not deal with
+; negative or off-screen values.
+_OriginToTileStore
+        lda   StartYMod208
+        lsr
+        lsr
+        and   #$FFFE                             ; Store the pre-multiplied by 2 for indexing
+        tay
+        lda   StartXMod164
+        lsr
+        and   #$FFFE                             ; Same pre-multiply by 2 for later
+        tax
+        rts
+
+; X = local x-coordinate (0, playfield width)
+; Y = local y-coordinate (0, playfield height)
+_LocalToTileStore
+        clc
+        tya
+        adc   StartYMod208                       ; Adjust for the scroll offset
+        cmp   #208                               ; check if we went too far positive
+        bcc   *+5
+        sbc   #208
+        lsr
+        lsr
+        and   #$FFFE                             ; Store the pre-multiplied by 2 for indexing
+        tay
+
+        clc
+        txa
+        adc   StartXMod164
+        cmp   #164
+        bcc   *+5
+        sbc   #164
+        lsr
+        and   #$FFFE                             ; Same pre-multiply by 2 for later
+        tax
+        rts
\ No newline at end of file
diff --git a/src/Defs.s b/src/Defs.s
index 568d504..0ef0580 100644
--- a/src/Defs.s
+++ b/src/Defs.s
@@ -34,6 +34,8 @@ StartX                 equ   16          ; Which code buffer byte is the left ed
 StartY                 equ   18          ; Which code buffer line is the top of the screen. Range = 0 to 207
 EngineMode             equ   20          ; Defined the mode/capabilities that are enabled
                                          ;  bit 0: 0 = Single Background, 1 = Parallax
+                                         ;  bit 1: 0 = No Dynamic Tiles, 1 = Allocate Bank 00 space for dynamic tiles
+                                         ;  bit 2: 0 = No static buffer, 1 = Allocation Bank 00 space for a static screen buffer
 DirtyBits              equ   22          ; Identify values that have changed between frames
 
 BG1DataBank            equ   24          ; Data bank that holds BG1 layer data
@@ -80,18 +82,25 @@ BG1TileMapPtr          equ   86
 
 SCBArrayPtr            equ   90          ; Used for palette binding
 SpriteBanks            equ   94          ; Bank bytes for the sprite data and sprite mask
-LastRender             equ   96          ; Record which reder function was last executed
+LastRender             equ   96          ; Record which render function was last executed
 ; gap
 SpriteMap              equ   100         ; Bitmap of open sprite slots.
 ActiveSpriteCount      equ   102
 BankLoad               equ   104
 TileStoreBankAndBank01 equ   106
 TileStoreBankAndTileDataBank equ 108
-Next                   equ   110
+TileStoreBankDoubled   equ   110
+UserId                 equ   112         ; Memory manager user Id to use
+ToolNum                equ   114         ; Tool number assigned to us
+LastKey                equ   116
+LastTick               equ   118
+ForceSpriteFlag        equ   120
+SpriteRemovedFlag      equ   122         ; Indicate if any sprites were removed this frame
+
+
 
 activeSpriteList       equ   128         ; 32 bytes for the active sprite list (can persist across frames)
-AppSpace               equ   160         ; 16 bytes of space reserved for application use
-tiletmp                equ   178         ; 16 bytes of temp storage for the tile renderers
+; tiletmp                equ   178         ; 16 bytes of temp storage for the tile renderers
 blttmp                 equ   192         ; 32 bytes of local cache/scratch space for blitter
 
 tmp8                   equ   224         ; another 16 bytes of temporary space to be used as scratch 
@@ -112,6 +121,50 @@ tmp5                   equ   250
 tmp6                   equ   252
 tmp7                   equ   254
 
+; Defines for the second direct page (used in the tile blitters)
+
+sprite_ptr0            equ   0           ; Each tile can render up to 4 sprite blocks.  The sprite
+sprite_ptr1            equ   4           ; data and mask values live in different banks, but have a
+sprite_ptr2            equ   8           ; parallel structure.  The high word of each point is set to
+sprite_ptr3            equ   12          ; the mask bank.  With the Bank register set, both data and mask
+;                                        ; can be accessed through the same pointer, e.g. lda (sprite_ptr0)
+;                                        ; and [sprite_ptr0]
+
+tmp_sprite_data        equ   16          ; 32 byte temporary buffer to build up sprite data values
+tmp_sprite_mask        equ   48          ; 32 byte temporary buffer to build up sprite mask values
+tmp_tile_data          equ   80          ; 32 byte temporary buffer to build up tile data values
+tmp_tile_mask          equ   112         ; 32 byte temporary buffer to build up tile mask values
+
+; Temporary direct page locations used by some of the complex tile renderers
+_X_REG                 equ   144
+_Y_REG                 equ   146
+_T_PTR                 equ   148         ; Copy of the tile address pointer
+_OP_CACHE2             equ   148         ; CAche of second opcode
+_BASE_ADDR             equ   150         ; Copy of BTableLow for this tile
+_SPR_X_REG             equ   152         ; Cache address of sprite plane source for a tile
+_JTBL_CACHE            equ   154         ; Cache the offset to the exception handler for a column
+_OP_CACHE              equ   156         ; Cache of a relevant operand / oeprator
+_TILE_ID               equ   158         ; Copy of the tile descriptor
+
+; Define free space the the application to use
+; FREE_SPACE_DP2         equ   160
+DP2_DIRTY_TILE_COUNT    equ  160         ; Local copy of dirty tile count to avoid banking
+DP2_DIRTY_TILE_CALLBACK equ  162
+
+; Some pre-defined bank values
+DP2_TILEDATA_AND_TILESTORE_BANKS equ 164
+DP2_SPRITEDATA_AND_TILESTORE_BANKS equ 166
+DP2_TILEDATA_AND_SPRITEDATA_BANKS equ 168
+
+SPRITE_VBUFF_PTR        equ  224         ; 32 bytes of adjusted pointers to VBuffArray addresses
+; End direct page values
+
+; EngineMode definitions
+ENGINE_MODE_TWO_LAYER  equ   $0001
+ENGINE_MODE_DYN_TILES  equ   $0002
+ENGINE_MODE_BNK0_BUFF  equ   $0004
+
+; DirtyBits definitions
 DIRTY_BIT_BG0_X        equ   $0001
 DIRTY_BIT_BG0_Y        equ   $0002
 DIRTY_BIT_BG1_X        equ   $0004
@@ -135,14 +188,16 @@ PAD_BUTTON_A           equ   $02
 PAD_KEY_DOWN           equ   $04
 
 ; Tile constants
-TILE_ID_MASK           equ   $01FF
-TILE_SPRITE_BIT        equ   $8000                  ; Set if this tile intersects an active sprite
+; TILE_RESERVED_BIT      equ   $8000
 TILE_PRIORITY_BIT      equ   $4000                  ; Put tile on top of sprite
-TILE_FRINGE_BIT        equ   $2000
-TILE_MASK_BIT          equ   $1000
-TILE_DYN_BIT           equ   $0800
+TILE_FRINGE_BIT        equ   $2000                  ; Unused
+TILE_SOLID_BIT         equ   $1000                  ; Hint bit used in TWO_LAYER_MODE to optimize rendering
+TILE_DYN_BIT           equ   $0800                  ; Is this a Dynamic Tile?
 TILE_VFLIP_BIT         equ   $0400
 TILE_HFLIP_BIT         equ   $0200
+TILE_ID_MASK           equ   $01FF
+TILE_CTRL_MASK         equ   $FE00
+; TILE_PROC_MASK         equ   $F800                  ; Select tile proc for rendering
 
 ; Sprite constants
 SPRITE_HIDE            equ   $2000
@@ -153,17 +208,53 @@ SPRITE_8X8             equ   $0000
 SPRITE_VFLIP           equ   $0400
 SPRITE_HFLIP           equ   $0200
 
-MAX_TILES             equ  {26*41}            ; Number of tiles in the code field (41 columns * 26 rows)
-TILE_STORE_SIZE       equ  {MAX_TILES*2}      ; The tile store contains a tile descriptor in each slot
+; Stamp storage parameters
+VBUFF_STRIDE_BYTES     equ {12*4}                        ; Each line has 4 slots of 16 pixels + 8 buffer pixels
+VBUFF_TILE_ROW_BYTES   equ {8*VBUFF_STRIDE_BYTES}        ; Each row is comprised of 8 lines
+VBUFF_TILE_COL_BYTES   equ 4
+VBUFF_SPRITE_STEP      equ {VBUFF_TILE_ROW_BYTES*3}      ; Allocate space for 16 rows + 8 rows of buffer
+VBUFF_SPRITE_START     equ {VBUFF_TILE_ROW_BYTES+4}      ; Start at an offset so $0000 can be used as an empty value
+VBUFF_SLOT_COUNT       equ 48                            ; Have space for this many stamps
 
-TS_TILE_ID            equ  TILE_STORE_SIZE*0      ; tile descriptor for this location
-TS_DIRTY              equ  TILE_STORE_SIZE*1      ; Flag. Used to prevent a tile from being queued multiple times per frame
-TS_SPRITE_FLAG        equ  TILE_STORE_SIZE*2      ; Bitfield of all sprites that intersect this tile. 0 if no sprites.
-TS_TILE_ADDR          equ  TILE_STORE_SIZE*3      ; cached value, the address of the tiledata for this tile
-TS_CODE_ADDR_LOW      equ  TILE_STORE_SIZE*4      ; const value, address of this tile in the code fields
-TS_CODE_ADDR_HIGH     equ  TILE_STORE_SIZE*5      ; const value
-TS_WORD_OFFSET        equ  TILE_STORE_SIZE*6      ; const value, word offset value for this tile if LDA (dp),y instructions re used
-TS_BASE_ADDR          equ  TILE_STORE_SIZE*7      ; const value, because there are two rows of tiles per bank, this is set to $0000 ot $8000.
-TS_SCREEN_ADDR        equ  TILE_STORE_SIZE*8      ; cached value of on-screen location of tile. Used for DirtyRender.
-TS_VBUFF_ARRAY_ADDR   equ  TILE_STORE_SIZE*9      ; const value to an aligned 32-byte array starting at $8000 in TileStore bank
-TS_TILE_DISP          equ  TILE_STORE_SIZE*10     ; derived from TS_TILE_ID to optimize tile dispatch in the Render function
+; This is 13 blocks wide
+SPRITE_PLANE_SPAN      equ VBUFF_STRIDE_BYTES
+
+; External references to data bank
+TileStore         EXT
+DirtyTileCount    EXT
+DirtyTiles        EXT
+_Sprites          EXT
+TileStore         EXT
+TileStoreLookupYTable EXT
+TileStoreLookup   EXT
+Col2CodeOffset    EXT
+JTableOffset      EXT
+CodeFieldEvenBRA  EXT
+CodeFieldOddBRA   EXT
+ScreenAddr        EXT
+TileStoreYTable   EXT
+NextCol           EXT
+RTable            EXT
+BlitBuff          EXT
+BTableHigh        EXT
+BTableLow         EXT
+BRowTableHigh     EXT
+BRowTableLow      EXT
+BG1YTable         EXT
+BG1YOffsetTable   EXT
+OldOneSecVec      EXT
+OneSecondCounter  EXT
+Timers            EXT
+DefaultPalette    EXT
+ScreenModeWidth   EXT
+ScreenModeHeight  EXT
+_SpriteBits       EXT
+_SpriteBitsNot    EXT
+VBuffArray        EXT
+_stamp_step       EXT
+VBuffVertTableSelect EXT
+VBuffHorzTableSelect EXT
+Overlays          EXT
+
+; Tool error codes
+NO_TIMERS_AVAILABLE  equ  10
diff --git a/src/GTE.s b/src/GTE.s
index 803c929..9af47d7 100644
--- a/src/GTE.s
+++ b/src/GTE.s
@@ -20,12 +20,10 @@ SetBG1XPos         EXT
 SetBG1YPos         EXT
 CopyBG0Tile        EXT
 CopyBG1Tile        EXT
-CopyTileToDyn      EXT
-Render             EXT
 
 ; SCB/Palette binding (high bit of array point indicates whether to bind to BG0 Y position (0)
 ; or BG1 Y position (1).
-SetSCBArray        EXT
+; SetSCBArray        EXT
 BltSCB             EXT
 
 ; Rotation
@@ -73,21 +71,3 @@ AllocBank          EXT
 ScreenAddr         EXT
 OneSecondCounter   EXT
 BlitBuff           EXT
-
-;; Helper function to load the GTE User Toolset
-;GTEInstall
-;                   php
-;                   ~InitialLoad userId;localToolPath;#0
-
-;                   pea       $8000                ; User tool
-;                   pea       $00A5                ; Tool 165
-;                   PushLong  toolPtr
-;                   _SetTSPtr
-                   
-;                   plp
-;                   rtl
-
-; Look for the tool set in the System Tools folder and then next to the application
-;sysToolPath        strl       '*:System:Tools:ToolGTE'
-;localToolPath      strl       '9:ToolGTE'
-;toolPtr            adrl       0
\ No newline at end of file
diff --git a/src/Graphics.s b/src/Graphics.s
index 5fe5f94..c4d7d3d 100644
--- a/src/Graphics.s
+++ b/src/Graphics.s
@@ -11,18 +11,81 @@ InitGraphics
                  lda   #0
                  jsr   _SetPalette
 
-                 jsr   _InitBG0             ; Initialize the background layers
-                 jsr   _InitBG1
+                 jsr   _InitBG0             ; Initialize the background layer
 
+                 lda   EngineMode
+                 bit   #ENGINE_MODE_TWO_LAYER
+                 beq   :no_bg1
+
+                 jsr   _InitBG1
                  lda   #0
                  jsr   _ClearBG1Buffer
 
+:no_bg1
                  rts
 
-DefaultPalette   dw    $0000,$007F,$0090,$0FF0
-                 dw    $000F,$0080,$0f70,$0FFF
-                 dw    $0fa9,$0ff0,$00e0,$04DF
-                 dw    $0d00,$078f,$0ccc,$0FFF
+; Allow the user to dynamically select one of the pre-configured screen sizes, or pass
+; in a specific width and height.  The screen is automatically centered.  If this is
+; not desired, then SetScreenRect should be used directly
+;
+;  0. Full Screen           : 40 x 25   320 x 200 (32,000 bytes (100.0%)) 
+;  1. Sword of Sodan        : 34 x 24   272 x 192 (26,112 bytes ( 81.6%))
+;  2. ~NES                  : 32 x 25   256 x 200 (25,600 bytes ( 80.0%))
+;  3. Task Force            : 32 x 22   256 x 176 (22,528 bytes ( 70.4%))
+;  4. Defender of the World : 35 x 20   280 x 160 (22,400 bytes ( 70.0%))
+;  5. Rastan                : 32 x 20   256 x 160 (20,480 bytes ( 64.0%))
+;  6. Game Boy Advanced     : 30 x 20   240 x 160 (19,200 bytes ( 60.0%))
+;  7. Ancient Land of Y's   : 36 x 16   288 x 128 (18,432 bytes ( 57.6%))
+;  8. Game Boy Color        : 20 x 18   160 x 144 (11,520 bytes ( 36.0%))
+;  9. Agony (Amiga)         : 36 x 24   288 x 192 (27,648 bytes ( 86.4%))
+; 10. Atari Lynx            : 20 x 13   160 x 102 (8,160 bytes  ( 25.5%))
+;
+;  X = mode number OR width in pixels (must be multiple of 2)
+;  Y = height in pixels (if X > 8)
+_SetScreenMode
+                  cpx       #11
+                  bcs       :direct             ; if x > 10, then assume X and Y are the dimensions
+
+                  txa
+                  asl
+                  tax
+
+                  ldy       ScreenModeHeight,x
+                  lda       ScreenModeWidth,x
+                  tax
+
+:direct           cpy       #201
+                  bcs       :exit
+
+                  cpx       #321
+                  bcs       :exit
+
+                  txa
+                  lsr
+                  pha                           ; Save X (width / 2) and Y (height)
+                  phy
+
+                  lda       #160                ; Center the screen
+                  sec
+                  sbc       3,s
+                  lsr
+                  xba
+                  pha                           ; Save half the origin coordinate
+
+                  lda       #200
+                  sec
+                  sbc       3,s                 ; This is now Y because of the PHA above
+                  lsr
+                  ora       1,s
+
+                  plx                           ; Throw-away to pop the stack
+                  ply
+                  plx
+
+                  jsr       SetScreenRect
+                  jmp       FillScreen          ; tail return
+:exit
+                  rts
 
 ; Return the current border color ($0 - $F) in the accumulator
 _GetBorderColor  lda   #0000
@@ -33,10 +96,6 @@ _GetBorderColor  lda   #0000
                  rts
 
 ; Set the border color to the accumulator value.
-SetBorderColor   ENT
-                 jsr   _SetBorderColor
-                 rtl
-
 _SetBorderColor  sep   #$20                 ; ACC = $X_Y, REG = $W_Z
                  eorl  BORDER_REG           ; ACC = $(X^Y)_(Y^Z)
                  and   #$0F                 ; ACC = $0_(Y^Z)
@@ -55,17 +114,6 @@ _ClearToColor
                  rts
 
 ; Set a palette values
-; A = high word of palette data pointer, X = low word of palette data pointer, Y = palette number
-SetPalette       ENT
-                 phb                        ; save old data bank
-                 pha                        ; push 16-bit value
-                 plb                        ; pop 8-bit bank register
-                 tya
-                 jsr   _SetPalette
-                 plb                        ; pop the other half of the 16-bit push off
-                 plb                        ; restore the original data bank
-                 rtl
-
 ; A = palette number, X = palette address
 _SetPalette
                  and   #$000F               ; palette values are 0 - 15 and each palette is 32 bytes
@@ -148,9 +196,139 @@ _WaitForVBL
                  rep   #$20
                  rts
 
+; Set the physical location of the virtual screen on the physical screen. The
+; screen size must by a multiple of 8
+;
+; A = XXYY where XX is the left edge [0, 159] and YY is the top edge [0, 199]
+; X = width (in bytes)
+; Y = height (in lines)
+;
+; This subroutine stores the screen positions in the direct page space and fills
+; in the double-length ScreenAddrR table that holds the address of the right edge
+; of the playfield.  This table is used to set addresses in the code banks when the
+; virtual origin is changed.
+;
+; We are not concerned about the raw performance of this function because it should
+; usually only be executed once during app initialization.  It doesn't get called
+; with any significant frequency.
 
+SetScreenRect      sty   ScreenHeight               ; Save the screen height and width
+                   stx   ScreenWidth
 
+                   tax                              ; Temp save of the accumulator
+                   and   #$00FF
+                   sta   ScreenY0
+                   clc
+                   adc   ScreenHeight
+                   sta   ScreenY1
 
+                   txa                              ; Restore the accumulator
+                   xba
+                   and   #$00FF
+                   sta   ScreenX0
+                   clc
+                   adc   ScreenWidth
+                   sta   ScreenX1
 
+                   lda   ScreenHeight               ; Divide the height in scanlines by 8 to get the number tiles
+                   lsr
+                   lsr
+                   lsr
+                   sta   ScreenTileHeight
 
+                   lda   ScreenWidth                ; Divide width in bytes by 4 to get the number of tiles
+                   lsr
+                   lsr
+                   sta   ScreenTileWidth
 
+                   lda   ScreenY0                   ; Calculate the address of the first byte
+                   asl                              ; of the right side of the playfield
+                   tax
+                   lda   ScreenAddr,x               ; This is the address for the edge of the physical screen
+                   clc
+                   adc   ScreenX1
+                   dec
+                   pha                              ; Save for second loop
+
+                   ldx   #0
+                   ldy   ScreenHeight
+:loop              clc
+                   sta   RTable,x
+                   adc   #160
+                   inx
+                   inx
+                   dey
+                   bne   :loop
+
+                   ldy   ScreenHeight
+                   pla                              ; Reset the address and continue filling in the
+:loop2             clc
+                   sta   RTable,x
+                   adc   #160
+                   inx
+                   inx
+                   dey
+                   bne   :loop2
+
+; Calculate the screen locations for each tile corner
+
+                   lda   ScreenY0                   ; Calculate the address of the first byte
+                   asl                              ; of the right side of the playfield
+                   tax
+                   lda   ScreenAddr,x               ; This is the address for the left edge of the physical screen
+                   clc
+                   adc   ScreenX0
+
+                   ldx   #0
+                   ldy   #0
+:tsloop
+                   sta   TileStore+TS_SCREEN_ADDR,x
+
+                   clc
+                   adc   #4                         ; Go to the next tile
+
+                   iny
+                   cpy   #41                        ; If we've done 41 columns, move to the next line
+                   bcc   :nohop
+                   ldy   #0
+                   clc
+                   adc   #{8*160}-{4*41}
+:nohop
+
+                   inx
+                   inx
+                   cpx   #TILE_STORE_SIZE-2
+                   bcc   :tsloop
+
+                   rts
+
+; Clear the SHR screen and then infill the defined field
+FillScreen         lda   #0
+                   jsr   _ClearToColor
+
+                   ldy   ScreenY0
+:yloop
+                   tya
+                   asl   a
+                   tax
+                   lda   ScreenAddr,x
+                   clc
+                   adc   ScreenX0
+                   tax
+                   phy
+
+                   lda   ScreenWidth
+                   lsr
+                   tay
+                   lda   #$FFFF
+:xloop             stal  $E10000,x                  ; X is the absolute address
+                   inx
+                   inx
+                   dey
+                   bne   :xloop
+
+                   ply
+                   iny
+                   cpy   ScreenY1
+                   bcc   :yloop
+                   rts
diff --git a/src/Master.s b/src/Master.s
new file mode 100644
index 0000000..9c9a012
--- /dev/null
+++ b/src/Master.s
@@ -0,0 +1,38 @@
+; IIgs Generic Tile Engine User Toolset
+
+            TYP   $BA                  ; Tool set file
+            DSK   Tool160
+            XPL
+
+; Main toolbox interface and code
+
+            ASM   Tool.s
+            SNA   Main
+
+; 64KB Tile Memory
+
+            ASM   static\TileData.s
+            KND   #$1001               ; Type and Attributes ($10=Static,$01=Data)
+            ALI   BANK
+            SNA   TDATA
+
+; 64KB Sprite Plane Data
+
+            ASM   static\SprData.s
+            KND   #$1001               ; Type and Attributes ($11=Static+Bank Relative,$01=Data)
+            ALI   BANK
+            SNA   SDATA
+
+; 64KB Sprite Mask Data
+
+            ASM   static\SprMask.s
+            KND   #$1001               ; Type and Attributes ($11=Static+Bank Relative,$01=Data)
+            ALI   BANK
+            SNA   SMASK
+
+; 64KB Tile Store
+
+            ASM   static\TileStore.s
+            KND   #$1001               ; Type and Attributes ($11=Static+Bank Relative,$01=Data)
+            ALI   BANK
+            SNA   TSTORE
diff --git a/src/Math.s b/src/Math.s
new file mode 100644
index 0000000..91ca035
--- /dev/null
+++ b/src/Math.s
@@ -0,0 +1,88 @@
+; Math-y functions
+
+                   mx    %00
+
+; Special subroutine to divide the accumulator by 164 and return remainder in the Accumulator
+;
+; 164 = $A4 = 1010_0100
+Mod164             cmp   #%1010010000000000
+                   bcc   *+5
+                   sbc   #%1010010000000000
+
+                   cmp   #%0101001000000000
+                   bcc   *+5
+                   sbc   #%0101001000000000
+
+                   cmp   #%0010100100000000
+                   bcc   *+5
+                   sbc   #%0010100100000000
+
+                   cmp   #%0001010010000000
+                   bcc   *+5
+                   sbc   #%0001010010000000
+
+                   cmp   #%0000101001000000
+                   bcc   *+5
+                   sbc   #%0000101001000000
+
+                   cmp   #%0000010100100000
+                   bcc   *+5
+                   sbc   #%0000010100100000
+
+                   cmp   #%0000001010010000
+                   bcc   *+5
+                   sbc   #%0000001010010000
+
+                   cmp   #%0000000101001000
+                   bcc   *+5
+                   sbc   #%0000000101001000
+
+                   cmp   #%0000000010100100
+                   bcc   *+5
+                   sbc   #%0000000010100100
+                   rts
+
+; Special subroutine to divide the accumulator by 208 and return remainder in the Accumulator
+;
+; 208 = $D0 = 1101_0000
+;
+; There are probably faster hacks to divide a 16-bit unsigned value by 208
+;   https://www.drdobbs.com/parallel/optimizing-integer-division-by-a-constan/184408499
+;   https://embeddedgurus.com/stack-overflow/2009/06/division-of-integers-by-constants/
+
+Mod208             cmp   #%1101000000000000
+                   bcc   *+5
+                   sbc   #%1101000000000000
+
+                   cmp   #%0110100000000000
+                   bcc   *+5
+                   sbc   #%0110100000000000
+
+                   cmp   #%0011010000000000
+                   bcc   *+5
+                   sbc   #%0011010000000000
+
+                   cmp   #%0001101000000000
+                   bcc   *+5
+                   sbc   #%0001101000000000
+
+                   cmp   #%0000110100000000
+                   bcc   *+5
+                   sbc   #%0000110100000000
+
+                   cmp   #%0000011010000000
+                   bcc   *+5
+                   sbc   #%0000011010000000
+
+                   cmp   #%0000001101000000
+                   bcc   *+5
+                   sbc   #%0000001101000000
+
+                   cmp   #%0000000110100000
+                   bcc   *+5
+                   sbc   #%0000000110100000
+
+                   cmp   #%0000000011010000
+                   bcc   *+5
+                   sbc   #%0000000011010000
+                   rts
diff --git a/src/Memory.s b/src/Memory.s
index 59b75bc..c4c449d 100644
--- a/src/Memory.s
+++ b/src/Memory.s
@@ -16,7 +16,11 @@
 
                mx        %00
 
-InitMemory     PushLong  #0                          ; space for result
+InitMemory     lda       EngineMode
+               bit       #ENGINE_MODE_BNK0_BUFF
+               beq       :no_bnk0_buff
+
+               PushLong  #0                          ; space for result
                PushLong  #$008000                    ; size (32k)
                PushWord  UserId
                PushWord  #%11000000_00010111         ; Fixed location
@@ -24,9 +28,10 @@ InitMemory     PushLong  #0                          ; space for result
                _NewHandle                            ; returns LONG Handle on stack
                plx                                   ; base address of the new handle
                pla                                   ; high address 00XX of the new handle (bank)
-               _Deref
-               stx       Buff00
-               sta       Buff00+2
+;               _Deref
+;               stx       Buff00
+;               sta       Buff00+2
+:no_bnk0_buff
 
                PushLong  #0                          ; space for result
                PushLong  #$008000                    ; size (32k)
@@ -36,12 +41,20 @@ InitMemory     PushLong  #0                          ; space for result
                _NewHandle                            ; returns LONG Handle on stack
                plx                                   ; base address of the new handle
                pla                                   ; high address 00XX of the new handle (bank)
-               _Deref
-               stx       Buff01
-               sta       Buff01+2
+;               _Deref
+;               stx       Buff01
+;               sta       Buff01+2
 
                PushLong  #0                          ; space for result
-               PushLong  #$000A00                    ; size (10 pages)
+
+               pea       #0000                       ; size (2 or 10 pages)
+               lda       EngineMode
+               bit       #ENGINE_MODE_DYN_TILES
+               beq       :no_dyn_tiles
+               pea       #$0A00                      ; 10 pages if dynamic tiles are enabled
+               bra       :dyn_done
+:no_dyn_tiles  pea       #$0200                      ; 2 pages if dynamic tiles are disabled
+:dyn_done
                PushWord  UserId
                PushWord  #%11000000_00010101         ; Page-aligned, fixed bank
                PushLong  #$000000
@@ -52,11 +65,15 @@ InitMemory     PushLong  #0                          ; space for result
                stx       BlitterDP
 
 ; Allocate banks of memory for BG1
+               lda       EngineMode
+               bit       #ENGINE_MODE_TWO_LAYER
+               beq       :no_bg1
                jsr       AllocOneBank2
                sta       BG1DataBank
 
                jsr       AllocOneBank2
                sta       BG1AltBank
+:no_bg1
 
 ; Allocate the 13 banks of memory we need and store in double-length array
 ]step          equ       0
@@ -80,6 +97,7 @@ InitMemory     PushLong  #0                          ; space for result
                sta       BTableHigh+]step+{208*2},x  ; 16 lines per bank
 ]step          equ       ]step+2
                --^
+
                lda       BlitBuff,y
                sta       BTableLow,x
                sta       BTableLow+{208*2},x
@@ -93,10 +111,12 @@ InitMemory     PushLong  #0                          ; space for result
                --^
 
                txa
+               clc
                adc       #16*2                       ; move to the next chunk of BTableHigh and BTableLow
                tax
 
                tya
+               clc
                adc       #4                          ; move to the next bank address
                tay
                cmp       #4*13
@@ -104,6 +124,7 @@ InitMemory     PushLong  #0                          ; space for result
                brl       :bloop
 :exit1
 
+
                ldx       #0
                ldy       #0
 :bloop2
@@ -135,9 +156,6 @@ InitMemory     PushLong  #0                          ; space for result
 :exit
                rts
 
-Buff00         ds        4
-Buff01         ds        4
-
 ; Bank allocator (for one full, fixed bank of memory. Can be immediately deferenced)
 
 AllocOneBank   PushLong  #0
@@ -149,19 +167,11 @@ AllocOneBank   PushLong  #0
                plx                                   ; base address of the new handle
                pla                                   ; high address 00XX of the new handle (bank)
                xba                                   ; swap accumulator bytes to XX00	
-               sta       :bank+2                     ; store as bank for next op (overwrite $XX00)
+               stal      :bank+2                     ; store as bank for next op (overwrite $XX00)
 :bank          ldal      $000001,X                   ; recover the bank address in A=XX/00	
                rts
 
 ; Variation that returns the pointer in the X/A registers (X = low, A = high)
-AllocBank      ENT
-               phb
-               phk
-               plb
-               jsr       AllocOneBank2
-               plb
-               rtl
-
 AllocOneBank2  PushLong  #0
                PushLong  #$10000
                PushWord  UserId
@@ -172,5 +182,3 @@ AllocOneBank2  PushLong  #0
                pla                                   ; high address 00XX of the new handle (bank)
                _Deref
                rts
-
-
diff --git a/src/Render.s b/src/Render.s
index b010f38..2a322f0 100644
--- a/src/Render.s
+++ b/src/Render.s
@@ -10,15 +10,7 @@
 ;
 ; Everything is composited into the tiles in the playfield and then the screen is rendered in
 ; a single pass.
-
-Render      ENT
-            phb
-            phk
-            plb
-            jsr   _Render
-            plb
-            rtl
-
+;
 ; TODO -- actually check the dirty bits and be selective on what gets updated.  For example, if
 ;         only the Y position changes, then we should only need to set new values on the 
 ;         virtual lines that were brought on screen.  If the X position only changes by one
@@ -28,6 +20,10 @@ Render      ENT
 ; It's important to do _ApplyBG0YPos first because it calculates the value of StartY % 208 which is
 ; used in all of the other loops
 _Render
+            jsr   _DoTimers            ; Run any pending timer tasks
+
+            stz   SpriteRemovedFlag   ; If we remove a sprite, then we need to flag a rebuild for the next frame
+
             jsr   _ApplyBG0YPos       ; Set stack addresses for the virtual lines to the physical screen
             jsr   _ApplyBG1YPos
 
@@ -36,55 +32,63 @@ _Render
             jsr   _ApplyBG0XPosPre
             jsr   _ApplyBG1XPosPre
 
-            nop
             jsr   _RenderSprites      ; Once the BG0 X and Y positions are committed, update sprite data
 
             jsr   _UpdateBG0TileMap   ; and the tile maps.  These subroutines build up a list of tiles
-            jsr   _UpdateBG1TileMap   ; that need to be updated in the code field
+;            jsr   _UpdateBG1TileMap   ; that need to be updated in the code field
 
-            nop
-            jsr   _ApplyTiles         ; This function actually draws the new tiles into the code field
+            jsr   _ApplyTilesFast      ; This function actually draws the new tiles into the code field
 
             jsr   _ApplyBG0XPos       ; Patch the code field instructions with exit BRA opcode
             jsr   _ApplyBG1XPos       ; Update the direct page value based on the horizontal position
 
-; The code fields are locked in now and ready to be rendered
+; The code fields are locked in now and ready to be rendered. See if there is an overlay or any
+; other reason to render with shadowing off.  Otherwise, just do things quickly.
 
-;            jsr   _ShadowOff
+            lda   Overlays
+            beq   :no_ovrly
+
+            jsr   _ShadowOff
 
 ; Shadowing is turned off. Render all of the scan lines that need a second pass. One
 ; optimization that can be done here is that the lines can be rendered in any order
 ; since it is not shown on-screen yet.
 
-;            ldx   #0                  ; Blit the full virtual buffer to the screen
-;            ldy   #8
-;            jsr   _BltRange
+            ldx   Overlays+2                  ; Blit the full virtual buffer to the screen
+            ldy   Overlays+4
+            jsr   _BltRange
 
 ; Turn shadowing back on
 
-;            jsr   _ShadowOn
+            jsr   _ShadowOn
 
 ; Now render all of the remaining lines in top-to-bottom (or bottom-to-top) order
 
-;            lda   ScreenY0             ; pass the address of the first line of the overlay
-;            clc
-;            adc   #0
-;            asl
-;            tax
-;            lda   ScreenAddr,x
-;            clc
-;            adc   ScreenX0
-;            jsl   Overlay
+            ldx   #0
+            ldy   Overlays+2
+            beq   :skip
+            jsr   _BltRange
+:skip
+            jsr   _DoOverlay
 
+            ldx   Overlays+4
+            cpx   ScreenHeight
+            beq   :done
+            ldy   ScreenHeight
+            jsr   _BltRange
+            bra   :done
+
+:no_ovrly
             ldx   #0                  ; Blit the full virtual buffer to the screen
             ldy   ScreenHeight
             jsr   _BltRange
+:done
 
-;            ldx   #0
-;            ldy   ScreenHeight
-;            jsr   _BltSCB
+            ldx   #0
+            ldy   ScreenHeight
+            jsr   _BltSCB
 
-            lda   StartY              ; Restore the fields back to their original state
+            lda   StartYMod208              ; Restore the fields back to their original state
             ldx   ScreenHeight
             jsr   _RestoreBG0Opcodes
 
@@ -100,6 +104,83 @@ _Render
 
             stz   DirtyBits
             stz   LastRender                    ; Mark that a full render was just performed
+
+            lda   SpriteRemovedFlag             ; If any sprite was removed, set the rebuild flag
+            beq   :no_removal
+            lda   #DIRTY_BIT_SPRITE_ARRAY
+            sta   DirtyBits
+:no_removal
+            rts
+
+_DoOverlay
+            lda   Overlays+6
+            stal  :disp+1
+            lda   Overlays+7
+            stal  :disp+2
+
+            lda   ScreenY0             ; pass the address of the first line of the overlay
+            clc
+            adc   Overlays+2
+            asl
+            tax
+            lda   ScreenAddr,x
+            clc
+            adc   ScreenX0
+:disp       jsl   $000000
+            rts
+
+; The _ApplyTilesFast is the same as _ApplyTiles, but we use the _RenderTileFast subroutine
+_ApplyTilesFast
+            ldx  DirtyTileCount
+
+            tdc
+            clc
+            adc  #$100                  ; move to the next page
+            tcd
+
+            stx  DP2_DIRTY_TILE_COUNT   ; Cache the dirty tile count
+            jsr  _PopDirtyTilesFast
+
+            tdc                         ; Move back to the original direct page
+            sec
+            sbc  #$100
+            tcd
+
+            stz  DirtyTileCount         ; Reset the dirty tile count
+            rts
+
+; The _ApplyTiles function is responsible for rendering all of the dirty tiles into the code
+; field.  In this function we switch to the second direct page which holds the temporary
+; working buffers for tile rendering.
+;
+_ApplyTiles
+            tdc
+            clc
+            adc  #$100                  ; move to the next page
+            tcd
+
+            bra  :begin
+
+:loop
+; Retrieve the offset of the next dirty Tile Store items in the X-register
+
+            jsr  _PopDirtyTile2
+
+; Call the generic dispatch with the Tile Store record pointer at by the X-register.
+
+            phb
+;            jsr  _RenderTile2
+            plb
+
+; Loop again until the list of dirty tiles is empty
+
+:begin      ldy  DirtyTileCount
+            bne  :loop
+
+            tdc                         ; Move back to the original direct page
+            sec
+            sbc  #$100
+            tcd
             rts
 
 ; This is a specialized render function that only updates the dirty tiles *and* draws them
@@ -108,58 +189,18 @@ _Render
 ; the sprite subsystem + tile attributes for single-screen games which should be able to run
 ; close to 60 fps.
 ;
-; Because we are register starved, there is a lot of inline code to quickly fetch the information
-; needed to render sprites appropriately.  If there was a way to efficiently maintain an ordered
-; and compact array of per-tile VBUFF addresses, rather than the current sparse array, then
-; the sprite handling code could be significantly streamlined.  A note for anyone attempting
-; this optimization:
-;
-; The _MarkDirtyTiles simply stores a sprite's per-tile VBUFF address and marks the tile 
-; as being occupied by the sprite with just 4 instructions
-;
-;    sta (vbuff_array_ptr),y
-;    lda TileStore+TS_SPRITE_FLAG,x
-;    ora SpriteBit,y
-;    sta TileStore+TS_SPRITE_FLAG,x
-;
-; Then, we have an unrolled loop that does repeated tests of
-;
-;    lsr
-;    bcc *+
-;    lda vbuff_array_ptr,y
-;    sta spriteVBuffArr
-;
-; The only gain to be had is if the sprites that are marked are in the high bits and there are no low-index
-; sprites.  Skipping over N bits of the SPRITE_FLAG takes only 5*N cycles.  So, on average, we might waste 
-; 40 cycles looking for the proper bit.
-;
-; Any improvement to the existing code would need to be able to maintain a data structure and get the final
-; values into the spriteVBuffArr for a total cost of under 75 cycles per tile.
-
-RenderDirty ENT
-            phb
-            phk
-            plb
-            jsr   _RenderDirty
-            plb
-            rtl
-
 ; In this renderer, we assume that there is no scrolling, so no need to update any information about
 ; the BG0/BG1 positions
 _RenderDirty
             lda   LastRender                    ; If the full renderer was last called, we assume that
             bne   :norecalc                     ; the scroll positions have likely changed, so recalculate
-            lda   #2                            ; blue
-            jsr   _SetBorderColor
             jsr   _RecalcTileScreenAddrs        ; them to make sure sprites draw at the correct screen address
+;            jsr   _ClearSpritesFromCodeField    ; Restore the tiles to their non-sprite versions
 :norecalc
-            lda   #3                            ; purple
-            jsr   _SetBorderColor
-            jsr   _RenderSprites
 
-            lda   #4                            ; dk. green
-            jsr   _SetBorderColor
-            jsr   _ApplyDirtyTiles
+;            jsr   _RenderSprites
+;            jsr   _ApplyDirtyTiles
+
             lda   #1
             sta   LastRender
             rts
@@ -186,34 +227,25 @@ _ApplyDirtyTiles
 
 ; Only render solid tiles and sprites
 _RenderDirtyTile
-            ldal  TileStore+TS_SPRITE_FLAG,x     ; This is a bitfield of all the sprites that intersect this tile, only care if non-zero or not
-            bne   dirty_sprite
+            lda   TileStore+TS_SPRITE_FLAG,y
+            beq   NoSpritesDirty                    ; This is faster if there are no sprites
+
+;           TODO: handle sprite drawing
 
 ; The rest of this function handles that non-sprite blit, which is super fast since it blits directly from the
 ; tile data store to the graphics screen with no masking. The only extra work is selecting a blit function
 ; based on the tile flip flags.
-
-            pei   TileStoreBankAndBank01         ; Special value that has the TileStore bank in LSB and $01 in MSB
-            plb
-            txy
-
-            ldx   TileStore+TS_TILE_DISP,y       ; get the finalized tile descriptor
-            ldal  DirtyTileProcs,x               ; load and patch in the appropriate subroutine
-            stal  :tiledisp+1
-
-            ldx   TileStore+TS_TILE_ADDR,y       ; load the address of this tile's data (pre-calculated)
-            lda   TileStore+TS_SCREEN_ADDR,y     ; Get the on-screen address of this tile
-            tay
-
-            plb                                  ; set the bank
-
+;
 ; B is set to Bank 01
-; A is set to the tile word offset (0 through 80 in steps of 4)
 ; Y is set to the top-left address of the tile in SHR screen
-; X is set to the address of the tile data
-
-:tiledisp   jmp   $0000                          ; render the tile
-
+; A is set to the address of the tile data
+NoSpritesDirty
+;            lda   TileStore+TS_DIRTY_TILE_DISP,y
+;            stal  :nsd+1
+            ldx   TileStore+TS_SCREEN_ADDR,y       ; Get the on-screen address of this tile
+            lda   TileStore+TS_TILE_ADDR,y         ; load the address of this tile's data (pre-calculated)
+            plb                                    ; set the code field bank
+:nsd        jmp   $0000
 ; Use some temporary space for the spriteIdx array (maximum of 4 entries)
 
 stkSave     equ tmp9
@@ -221,781 +253,303 @@ screenAddr  equ tmp10
 tileAddr    equ tmp11
 spriteIdx   equ tmp12
 
-; Handler for the sprite path
-dirty_sprite
-                 pei   TileStoreBankAndTileDataBank   ; Special value that has the TileStore bank in LSB and TileData bank in MSB
-                 plb
-
-; Cache a couple of values into the direct page, but preserve the Accumulator
-
-                 ldy   TileStore+TS_TILE_ADDR,x       ; load the address of this tile's data (pre-calculated)
-                 sty   tileAddr
-                 ldy   TileStore+TS_SCREEN_ADDR,x     ; Get the on-screen address of this tile
-                 sty   screenAddr
-
-; Now do all of the deferred work of actually drawing the sprites.  We put considerable effort into
-; figuring out if there is only one sprite or more than one since we optimize the former case as it
-; is very common and can be done significantly faster.
-;
-; This is a big, unrolled chunk of code that packs the VBUFF addresses for the sprite positions marked
-; in the bitfield into the spriteIdx array and then jumps to an optimized rendering function based on
-; the number of sprites on the tile.
-;
-; After each set bit is identified, we check to see if that was the last one and immediately exit.  Since
-; a maximum of 4 sprites are processed per tile, this only results in (at most) 4 extra branch instructions.
-
-                 ldy   TileStore+TS_VBUFF_ARRAY_ADDR,x     ; base address of the VBUFF sprite address array for this tile
-
-                 lsr
-                 bcc   :loop_0_bit_1
-                 ldx:  $0000,y
-                 stx   spriteIdx
-                 cmp   #0
-                 jne   :loop_1_bit_1
-                 jmp   BlitOneSprite
-
-:loop_0_bit_1    lsr
-                 bcc   :loop_0_bit_2
-                 ldx:  $0002,y
-                 stx   spriteIdx
-                 cmp   #0
-                 jne   :loop_1_bit_2
-                 jmp   BlitOneSprite
-
-:loop_0_bit_2    lsr
-                 bcc   :loop_0_bit_3
-                 ldx:  $0004,y
-                 stx   spriteIdx
-                 cmp   #0
-                 jne   :loop_1_bit_3
-                 jmp   BlitOneSprite
-
-:loop_0_bit_3    lsr
-                 bcc   :loop_0_bit_4
-                 ldx:  $0006,y
-                 stx   spriteIdx
-                 cmp   #0
-                 jne   :loop_1_bit_4
-                 jmp   BlitOneSprite
-
-:loop_0_bit_4    lsr
-                 bcc   :loop_0_bit_5
-                 ldx:  $0008,y
-                 stx   spriteIdx
-                 cmp   #0
-                 jne   :loop_1_bit_5
-                 jmp   BlitOneSprite
-
-:loop_0_bit_5    lsr
-                 bcc   :loop_0_bit_6
-                 ldx:  $000A,y
-                 stx   spriteIdx
-                 cmp   #0
-                 jne   :loop_1_bit_6
-                 jmp   BlitOneSprite
-
-:loop_0_bit_6    lsr
-                 bcc   :loop_0_bit_7
-                 ldx:  $000C,y
-                 stx   spriteIdx
-                 cmp   #0
-                 jne   :loop_1_bit_7
-                 jmp   BlitOneSprite
-
-:loop_0_bit_7    lsr
-                 bcc   :loop_0_bit_8
-                 ldx:  $000E,y
-                 stx   spriteIdx
-                 cmp   #0
-                 jne   :loop_1_bit_8
-                 jmp   BlitOneSprite
-
-:loop_0_bit_8    lsr
-                 bcc   :loop_0_bit_9
-                 ldx:  $0010,y
-                 stx   spriteIdx
-                 cmp   #0
-                 jne   :loop_1_bit_9
-                 jmp   BlitOneSprite
-
-:loop_0_bit_9    lsr
-                 bcc   :loop_0_bit_10
-                 ldx:  $0012,y
-                 stx   spriteIdx
-                 cmp   #0
-                 jne   :loop_1_bit_10
-                 jmp   BlitOneSprite
-
-:loop_0_bit_10   lsr
-                 bcc   :loop_0_bit_11
-                 ldx:  $0014,y
-                 stx   spriteIdx
-                 cmp   #0
-                 jne   :loop_1_bit_11
-                 jmp   BlitOneSprite
-
-:loop_0_bit_11   lsr
-                 bcc   :loop_0_bit_12
-                 ldx:  $0016,y
-                 stx   spriteIdx
-                 cmp   #0
-                 jne   :loop_1_bit_12
-                 jmp   BlitOneSprite
-
-:loop_0_bit_12   lsr
-                 bcc   :loop_0_bit_13
-                 ldx:  $0018,y
-                 stx   spriteIdx
-                 cmp   #0
-                 jne   :loop_1_bit_13
-                 jmp   BlitOneSprite
-
-:loop_0_bit_13   lsr
-                 bcc   :loop_0_bit_14
-                 ldx:  $001A,y
-                 stx   spriteIdx
-                 cmp   #0
-                 jne   :loop_1_bit_14
-                 jmp   BlitOneSprite
-
-:loop_0_bit_14   lsr
-                 bcc   :loop_0_bit_15
-                 ldx:  $001C,y
-                 stx   spriteIdx
-                 cmp   #0
-                 jne   :loop_1_bit_15
-                 jmp   BlitOneSprite
-
-; If we get to bit 15, then it *must* be a bit that is set
-:loop_0_bit_15   ldx:  $001E,y
-                 stx   spriteIdx
-                 jmp   BlitOneSprite
-
-:loop_1_bit_1    lsr
-                 bcc   :loop_1_bit_2
-                 ldx:  $0002,y
-                 stx   spriteIdx+2
-                 cmp   #0
-                 jne   :loop_2_bit_2
-                 jmp   BlitTwoSprites
-
-:loop_1_bit_2    lsr
-                 bcc   :loop_1_bit_3
-                 ldx:  $0004,y
-                 stx   spriteIdx+2
-                 cmp   #0
-                 jne   :loop_2_bit_3
-                 jmp   BlitTwoSprites
-
-:loop_1_bit_3    lsr
-                 bcc   :loop_1_bit_4
-                 ldx:  $0006,y
-                 stx   spriteIdx+2
-                 cmp   #0
-                 jne   :loop_2_bit_4
-                 jmp   BlitTwoSprites
-
-:loop_1_bit_4    lsr
-                 bcc   :loop_1_bit_5
-                 ldx:  $0008,y
-                 stx   spriteIdx+2
-                 cmp   #0
-                 jne   :loop_2_bit_5
-                 jmp   BlitTwoSprites
-
-:loop_1_bit_5    lsr
-                 bcc   :loop_1_bit_6
-                 ldx:  $000A,y
-                 stx   spriteIdx+2
-                 cmp   #0
-                 jne   :loop_2_bit_6
-                 jmp   BlitTwoSprites
-
-:loop_1_bit_6    lsr
-                 bcc   :loop_1_bit_7
-                 ldx:  $000C,y
-                 stx   spriteIdx+2
-                 cmp   #0
-                 jne   :loop_2_bit_7
-                 jmp   BlitTwoSprites
-
-:loop_1_bit_7    lsr
-                 bcc   :loop_1_bit_8
-                 ldx:  $000E,y
-                 stx   spriteIdx+2
-                 cmp   #0
-                 jne   :loop_2_bit_8
-                 jmp   BlitTwoSprites
-
-:loop_1_bit_8    lsr
-                 bcc   :loop_1_bit_9
-                 ldx:  $0010,y
-                 stx   spriteIdx+2
-                 cmp   #0
-                 jne   :loop_2_bit_9
-                 jmp   BlitTwoSprites
-
-:loop_1_bit_9    lsr
-                 bcc   :loop_1_bit_10
-                 ldx:  $0012,y
-                 stx   spriteIdx+2
-                 cmp   #0
-                 jne   :loop_2_bit_10
-                 jmp   BlitTwoSprites
-
-:loop_1_bit_10   lsr
-                 bcc   :loop_1_bit_11
-                 ldx:  $0014,y
-                 stx   spriteIdx+2
-                 cmp   #0
-                 jne   :loop_2_bit_11
-                 jmp   BlitTwoSprites
-
-:loop_1_bit_11   lsr
-                 bcc   :loop_1_bit_12
-                 ldx:  $0016,y
-                 stx   spriteIdx+2
-                 cmp   #0
-                 jne   :loop_2_bit_12
-                 jmp   BlitTwoSprites
-
-:loop_1_bit_12   lsr
-                 bcc   :loop_1_bit_13
-                 ldx:  $0018,y
-                 stx   spriteIdx+2
-                 cmp   #0
-                 jne   :loop_2_bit_13
-                 jmp   BlitTwoSprites
-
-:loop_1_bit_13   lsr
-                 bcc   :loop_1_bit_14
-                 ldx:  $001A,y
-                 stx   spriteIdx+2
-                 cmp   #0
-                 jne   :loop_2_bit_14
-                 jmp   BlitTwoSprites
-
-:loop_1_bit_14   lsr
-                 bcc   :loop_1_bit_15
-                 ldx:  $001C,y
-                 stx   spriteIdx+2
-                 cmp   #0
-                 jne   :loop_2_bit_15
-                 jmp   BlitTwoSprites
-
-:loop_1_bit_15   ldx:  $001E,y
-                 stx   spriteIdx+2
-                 jmp   BlitTwoSprites
-
-:loop_2_bit_2    lsr
-                 bcc   :loop_2_bit_3
-                 ldx:  $0004,y
-                 stx   spriteIdx+4
-                 cmp   #0
-                 jne   :loop_3_bit_3
-                 jmp   BlitThreeSprites
-
-:loop_2_bit_3    lsr
-                 bcc   :loop_2_bit_4
-                 ldx:  $0006,y
-                 stx   spriteIdx+4
-                 cmp   #0
-                 jne   :loop_3_bit_4
-                 jmp   BlitThreeSprites
-
-:loop_2_bit_4    lsr
-                 bcc   :loop_2_bit_5
-                 ldx:  $0008,y
-                 stx   spriteIdx+4
-                 cmp   #0
-                 jne   :loop_3_bit_5
-                 jmp   BlitThreeSprites
-
-:loop_2_bit_5    lsr
-                 bcc   :loop_2_bit_6
-                 ldx:  $000A,y
-                 stx   spriteIdx+4
-                 cmp   #0
-                 jne   :loop_3_bit_6
-                 jmp   BlitThreeSprites
-
-:loop_2_bit_6    lsr
-                 bcc   :loop_2_bit_7
-                 ldx:  $000C,y
-                 stx   spriteIdx+4
-                 cmp   #0
-                 jne   :loop_3_bit_7
-                 jmp   BlitThreeSprites
-
-:loop_2_bit_7    lsr
-                 bcc   :loop_2_bit_8
-                 ldx:  $000E,y
-                 stx   spriteIdx+4
-                 cmp   #0
-                 jne   :loop_3_bit_8
-                 jmp   BlitThreeSprites
-
-:loop_2_bit_8    lsr
-                 bcc   :loop_2_bit_9
-                 ldx:  $0010,y
-                 stx   spriteIdx+4
-                 cmp   #0
-                 jne   :loop_3_bit_9
-                 jmp   BlitThreeSprites
-
-:loop_2_bit_9    lsr
-                 bcc   :loop_2_bit_10
-                 ldx:  $0012,y
-                 stx   spriteIdx+4
-                 cmp   #0
-                 jne   :loop_3_bit_10
-                 jmp   BlitThreeSprites
-
-:loop_2_bit_10   lsr
-                 bcc   :loop_2_bit_11
-                 ldx:  $0014,y
-                 stx   spriteIdx+4
-                 cmp   #0
-                 jne   :loop_3_bit_11
-                 jmp   BlitThreeSprites
-
-:loop_2_bit_11   lsr
-                 bcc   :loop_2_bit_12
-                 ldx:  $0016,y
-                 stx   spriteIdx+4
-                 cmp   #0
-                 jne   :loop_3_bit_12
-                 jmp   BlitThreeSprites
-
-:loop_2_bit_12   lsr
-                 bcc   :loop_2_bit_13
-                 ldx:  $0018,y
-                 stx   spriteIdx+4
-                 cmp   #0
-                 jne   :loop_3_bit_13
-                 jmp   BlitThreeSprites
-
-:loop_2_bit_13   lsr
-                 bcc   :loop_2_bit_14
-                 ldx:  $001A,y
-                 stx   spriteIdx+4
-                 cmp   #0
-                 jne   :loop_3_bit_14
-                 jmp   BlitThreeSprites
-
-:loop_2_bit_14   lsr
-                 bcc   :loop_2_bit_15
-                 ldx:  $001C,y
-                 stx   spriteIdx+4
-                 cmp   #0
-                 jne   :loop_3_bit_15
-                 jmp   BlitThreeSprites
-
-:loop_2_bit_15   ldx:  $001E,y
-                 stx   spriteIdx+4
-                 jmp   BlitThreeSprites
-
-:loop_3_bit_3    lsr
-                 bcc   :loop_3_bit_4
-                 ldx   $0006,y
-                 stx   spriteIdx+6
-                 jmp   BlitFourSprites
-
-:loop_3_bit_4    lsr
-                 bcc   :loop_3_bit_5
-                 ldx   $0008,y
-                 stx   spriteIdx+6
-                 jmp   BlitFourSprites
-
-:loop_3_bit_5    lsr
-                 bcc   :loop_3_bit_6
-                 ldx   $000A,y
-                 stx   spriteIdx+6
-                 jmp   BlitFourSprites
-
-:loop_3_bit_6    lsr
-                 bcc   :loop_3_bit_7
-                 ldx   $000C,y
-                 stx   spriteIdx+6
-                 jmp   BlitFourSprites
-
-:loop_3_bit_7    lsr
-                 bcc   :loop_3_bit_8
-                 ldx   $000E,y
-                 stx   spriteIdx+6
-                 jmp   BlitFourSprites
-
-:loop_3_bit_8    lsr
-                 bcc   :loop_3_bit_9
-                 ldx   $0010,y
-                 stx   spriteIdx+6
-                 jmp   BlitFourSprites
-
-:loop_3_bit_9    lsr
-                 bcc   :loop_3_bit_10
-                 ldx   $0012,y
-                 stx   spriteIdx+6
-                 jmp   BlitFourSprites
-
-:loop_3_bit_10   lsr
-                 bcc   :loop_3_bit_11
-                 ldx   $0014,y
-                 stx   spriteIdx+6
-                 jmp   BlitFourSprites
-
-:loop_3_bit_11   lsr
-                 bcc   :loop_3_bit_12
-                 ldx   $0016,y
-                 stx   spriteIdx+6
-                 jmp   BlitFourSprites
-
-:loop_3_bit_12   lsr
-                 bcc   :loop_3_bit_13
-                 ldx   $0018,y
-                 stx   spriteIdx+6
-                 jmp   BlitFourSprites
-
-:loop_3_bit_13   lsr
-                 bcc   :loop_3_bit_14
-                 ldx   $001A,y
-                 stx   spriteIdx+6
-                 jmp   BlitFourSprites
-
-:loop_3_bit_14   lsr
-                 bcc   :loop_3_bit_15
-                 ldx   $001C,y
-                 stx   spriteIdx+6
-                 jmp   BlitFourSprites
-
-:loop_3_bit_15   ldx   $001E,y
-                 stx   spriteIdx+6
-                 jmp   BlitFourSprites
-
-DirtyTileProcs       dw  _TBDirtyTile_00,_TBDirtyTile_0H,_TBDirtyTile_V0,_TBDirtyTile_VH
-;DirtyTileSpriteProcs dw  _TBDirtySpriteTile_00,_TBDirtySpriteTile_0H,_TBDirtySpriteTile_V0,_TBDirtySpriteTile_VH
-
-; Blit tiles directly to the screen.
-_TBDirtyTile_00
-_TBDirtyTile_0H
-]line            equ             0
-                 lup             8
-                 ldal            tiledata+{]line*4},x
-                 sta:            $0000+{]line*160},y
-                 ldal            tiledata+{]line*4}+2,x
-                 sta:            $0002+{]line*160},y
-]line            equ             ]line+1
-                 --^
-                 rts
-
-_TBDirtyTile_V0
-_TBDirtyTile_VH
-]src             equ             7
-]dest            equ             0
-                 lup             8
-                 ldal            tiledata+{]src*4},x
-                 sta:            $0000+{]dest*160},y
-                 ldal            tiledata+{]src*4}+2,x
-                 sta:            $0002+{]dest*160},y
-]src             equ             ]src-1
-]dest            equ             ]dest+1
-                 --^
-                 rts
-
-TILE_DATA_SPAN equ 4
-
 ; If there are two or more sprites at a tile, we can still be fast, but need to do extra work because
 ; the VBUFF values need to be read from the direct page.  Thus, the direct page cannot be mapped onto
 ; the graphics screen.  We use the stack instead, but have to do extra work to save and restore the
 ; stack value.
-BlitFourSprites
-BlitThreeSprites
-BlitTwoSprites
-                 plb
-                 tsc
-                 sta   stkSave                          ; Save the stack on the direct page
+FourSpritesDirty
+ThreeSpritesDirty
+TwoSpritesDirty
+
+            sta  tileAddr
+            stx  screenAddr
+
+            plb
+            tsc
+            sta   stkSave                          ; Save the stack on the direct page
                  
-                 sei
-                 clc
+            sei
+            clc
 
-                 ldy   tileAddr
-                 lda   screenAddr                     ; Saved in direct page locations
-                 tcs
+            ldy   tileAddr
+            lda   screenAddr                     ; Saved in direct page locations
+            tcs
 
-                 _R0W1
+            _R0W1
 
-                 lda   tiledata+{0*TILE_DATA_SPAN},y
-                 ldx   spriteIdx+2
-                 andl  spritemask+{0*SPRITE_PLANE_SPAN},x
-                 oral  spritedata+{0*SPRITE_PLANE_SPAN},x
-                 ldx   spriteIdx
-                 andl  spritemask+{0*SPRITE_PLANE_SPAN},x
-                 oral  spritedata+{0*SPRITE_PLANE_SPAN},x
-                 sta   $00,s
+            lda   tiledata+{0*TILE_DATA_SPAN},y
+            ldx   spriteIdx+2
+            andl  spritemask+{0*SPRITE_PLANE_SPAN},x
+            oral  spritedata+{0*SPRITE_PLANE_SPAN},x
+            ldx   spriteIdx
+            andl  spritemask+{0*SPRITE_PLANE_SPAN},x
+            oral  spritedata+{0*SPRITE_PLANE_SPAN},x
+            sta   $00,s
 
-                 lda   tiledata+{0*TILE_DATA_SPAN}+2,y
-                 ldx   spriteIdx+2
-                 andl  spritemask+{0*SPRITE_PLANE_SPAN}+2,x
-                 oral  spritedata+{0*SPRITE_PLANE_SPAN}+2,x
-                 ldx   spriteIdx
-                 andl  spritemask+{0*SPRITE_PLANE_SPAN}+2,x
-                 oral  spritedata+{0*SPRITE_PLANE_SPAN}+2,x
-                 sta   $02,s
+            lda   tiledata+{0*TILE_DATA_SPAN}+2,y
+            ldx   spriteIdx+2
+            andl  spritemask+{0*SPRITE_PLANE_SPAN}+2,x
+            oral  spritedata+{0*SPRITE_PLANE_SPAN}+2,x
+            ldx   spriteIdx
+            andl  spritemask+{0*SPRITE_PLANE_SPAN}+2,x
+            oral  spritedata+{0*SPRITE_PLANE_SPAN}+2,x
+            sta   $02,s
 
-                 lda   tiledata+{1*TILE_DATA_SPAN},y
-                 ldx   spriteIdx+2
-                 andl  spritemask+{1*SPRITE_PLANE_SPAN},x
-                 oral  spritedata+{1*SPRITE_PLANE_SPAN},x
-                 ldx   spriteIdx
-                 andl  spritemask+{1*SPRITE_PLANE_SPAN},x
-                 oral  spritedata+{1*SPRITE_PLANE_SPAN},x
-                 sta   $A0,s
+            lda   tiledata+{1*TILE_DATA_SPAN},y
+            ldx   spriteIdx+2
+            andl  spritemask+{1*SPRITE_PLANE_SPAN},x
+            oral  spritedata+{1*SPRITE_PLANE_SPAN},x
+            ldx   spriteIdx
+            andl  spritemask+{1*SPRITE_PLANE_SPAN},x
+            oral  spritedata+{1*SPRITE_PLANE_SPAN},x
+            sta   $A0,s
 
-                 lda   tiledata+{1*TILE_DATA_SPAN}+2,y
-                 ldx   spriteIdx+2
-                 andl  spritemask+{1*SPRITE_PLANE_SPAN}+2,x
-                 oral  spritedata+{1*SPRITE_PLANE_SPAN}+2,x
-                 ldx   spriteIdx
-                 andl  spritemask+{1*SPRITE_PLANE_SPAN}+2,x
-                 oral  spritedata+{1*SPRITE_PLANE_SPAN}+2,x
-                 sta   $A2,s
+            lda   tiledata+{1*TILE_DATA_SPAN}+2,y
+            ldx   spriteIdx+2
+            andl  spritemask+{1*SPRITE_PLANE_SPAN}+2,x
+            oral  spritedata+{1*SPRITE_PLANE_SPAN}+2,x
+            ldx   spriteIdx
+            andl  spritemask+{1*SPRITE_PLANE_SPAN}+2,x
+            oral  spritedata+{1*SPRITE_PLANE_SPAN}+2,x
+            sta   $A2,s
 
-                 tsc
-                 adc   #320
-                 tcs
+            tsc
+            adc   #320
+            tcs
 
-                 lda   tiledata+{2*TILE_DATA_SPAN},y
-                 ldx   spriteIdx+2
-                 andl  spritemask+{2*SPRITE_PLANE_SPAN},x
-                 oral  spritedata+{2*SPRITE_PLANE_SPAN},x
-                 ldx   spriteIdx
-                 andl  spritemask+{2*SPRITE_PLANE_SPAN},x
-                 oral  spritedata+{2*SPRITE_PLANE_SPAN},x
-                 sta   $00,s
+            lda   tiledata+{2*TILE_DATA_SPAN},y
+            ldx   spriteIdx+2
+            andl  spritemask+{2*SPRITE_PLANE_SPAN},x
+            oral  spritedata+{2*SPRITE_PLANE_SPAN},x
+            ldx   spriteIdx
+            andl  spritemask+{2*SPRITE_PLANE_SPAN},x
+            oral  spritedata+{2*SPRITE_PLANE_SPAN},x
+            sta   $00,s
 
-                 lda   tiledata+{2*TILE_DATA_SPAN}+2,y
-                 ldx   spriteIdx+2
-                 andl  spritemask+{2*SPRITE_PLANE_SPAN}+2,x
-                 oral  spritedata+{2*SPRITE_PLANE_SPAN}+2,x
-                 ldx   spriteIdx
-                 andl  spritemask+{2*SPRITE_PLANE_SPAN}+2,x
-                 oral  spritedata+{2*SPRITE_PLANE_SPAN}+2,x
-                 sta   $02,s
+            lda   tiledata+{2*TILE_DATA_SPAN}+2,y
+            ldx   spriteIdx+2
+            andl  spritemask+{2*SPRITE_PLANE_SPAN}+2,x
+            oral  spritedata+{2*SPRITE_PLANE_SPAN}+2,x
+            ldx   spriteIdx
+            andl  spritemask+{2*SPRITE_PLANE_SPAN}+2,x
+            oral  spritedata+{2*SPRITE_PLANE_SPAN}+2,x
+            sta   $02,s
 
-                 lda   tiledata+{3*TILE_DATA_SPAN},y
-                 ldx   spriteIdx+2
-                 andl  spritemask+{3*SPRITE_PLANE_SPAN},x
-                 oral  spritedata+{3*SPRITE_PLANE_SPAN},x
-                 ldx   spriteIdx
-                 andl  spritemask+{3*SPRITE_PLANE_SPAN},x
-                 oral  spritedata+{3*SPRITE_PLANE_SPAN},x
-                 sta   $A0,s
+            lda   tiledata+{3*TILE_DATA_SPAN},y
+            ldx   spriteIdx+2
+            andl  spritemask+{3*SPRITE_PLANE_SPAN},x
+            oral  spritedata+{3*SPRITE_PLANE_SPAN},x
+            ldx   spriteIdx
+            andl  spritemask+{3*SPRITE_PLANE_SPAN},x
+            oral  spritedata+{3*SPRITE_PLANE_SPAN},x
+            sta   $A0,s
 
-                 lda   tiledata+{3*TILE_DATA_SPAN}+2,y
-                 ldx   spriteIdx+2
-                 andl  spritemask+{3*SPRITE_PLANE_SPAN}+2,x
-                 oral  spritedata+{3*SPRITE_PLANE_SPAN}+2,x
-                 ldx   spriteIdx
-                 andl  spritemask+{3*SPRITE_PLANE_SPAN}+2,x
-                 oral  spritedata+{3*SPRITE_PLANE_SPAN}+2,x
-                 sta   $A2,s
+            lda   tiledata+{3*TILE_DATA_SPAN}+2,y
+            ldx   spriteIdx+2
+            andl  spritemask+{3*SPRITE_PLANE_SPAN}+2,x
+            oral  spritedata+{3*SPRITE_PLANE_SPAN}+2,x
+            ldx   spriteIdx
+            andl  spritemask+{3*SPRITE_PLANE_SPAN}+2,x
+            oral  spritedata+{3*SPRITE_PLANE_SPAN}+2,x
+            sta   $A2,s
 
-                 tsc
-                 adc   #320
-                 tcs
+            tsc
+            adc   #320
+            tcs
 
-                 lda   tiledata+{4*TILE_DATA_SPAN},y
-                 ldx   spriteIdx+2
-                 andl  spritemask+{4*SPRITE_PLANE_SPAN},x
-                 oral  spritedata+{4*SPRITE_PLANE_SPAN},x
-                 ldx   spriteIdx
-                 andl  spritemask+{4*SPRITE_PLANE_SPAN},x
-                 oral  spritedata+{4*SPRITE_PLANE_SPAN},x
-                 sta   $00,s
+            lda   tiledata+{4*TILE_DATA_SPAN},y
+            ldx   spriteIdx+2
+            andl  spritemask+{4*SPRITE_PLANE_SPAN},x
+            oral  spritedata+{4*SPRITE_PLANE_SPAN},x
+            ldx   spriteIdx
+            andl  spritemask+{4*SPRITE_PLANE_SPAN},x
+            oral  spritedata+{4*SPRITE_PLANE_SPAN},x
+            sta   $00,s
 
-                 lda   tiledata+{4*TILE_DATA_SPAN}+2,y
-                 ldx   spriteIdx+2
-                 andl  spritemask+{4*SPRITE_PLANE_SPAN}+2,x
-                 oral  spritedata+{4*SPRITE_PLANE_SPAN}+2,x
-                 ldx   spriteIdx
-                 andl  spritemask+{4*SPRITE_PLANE_SPAN}+2,x
-                 oral  spritedata+{4*SPRITE_PLANE_SPAN}+2,x
-                 sta   $02,s
+            lda   tiledata+{4*TILE_DATA_SPAN}+2,y
+            ldx   spriteIdx+2
+            andl  spritemask+{4*SPRITE_PLANE_SPAN}+2,x
+            oral  spritedata+{4*SPRITE_PLANE_SPAN}+2,x
+            ldx   spriteIdx
+            andl  spritemask+{4*SPRITE_PLANE_SPAN}+2,x
+            oral  spritedata+{4*SPRITE_PLANE_SPAN}+2,x
+            sta   $02,s
 
-                 lda   tiledata+{5*TILE_DATA_SPAN},y
-                 ldx   spriteIdx+2
-                 andl  spritemask+{5*SPRITE_PLANE_SPAN},x
-                 oral  spritedata+{5*SPRITE_PLANE_SPAN},x
-                 ldx   spriteIdx
-                 andl  spritemask+{5*SPRITE_PLANE_SPAN},x
-                 oral  spritedata+{5*SPRITE_PLANE_SPAN},x
-                 sta   $A0,s
+            lda   tiledata+{5*TILE_DATA_SPAN},y
+            ldx   spriteIdx+2
+            andl  spritemask+{5*SPRITE_PLANE_SPAN},x
+            oral  spritedata+{5*SPRITE_PLANE_SPAN},x
+            ldx   spriteIdx
+            andl  spritemask+{5*SPRITE_PLANE_SPAN},x
+            oral  spritedata+{5*SPRITE_PLANE_SPAN},x
+            sta   $A0,s
 
-                 lda   tiledata+{5*TILE_DATA_SPAN}+2,y
-                 ldx   spriteIdx+2
-                 andl  spritemask+{5*SPRITE_PLANE_SPAN}+2,x
-                 oral  spritedata+{5*SPRITE_PLANE_SPAN}+2,x
-                 ldx   spriteIdx
-                 andl  spritemask+{5*SPRITE_PLANE_SPAN}+2,x
-                 oral  spritedata+{5*SPRITE_PLANE_SPAN}+2,x
-                 sta   $A2,s
+            lda   tiledata+{5*TILE_DATA_SPAN}+2,y
+            ldx   spriteIdx+2
+            andl  spritemask+{5*SPRITE_PLANE_SPAN}+2,x
+            oral  spritedata+{5*SPRITE_PLANE_SPAN}+2,x
+            ldx   spriteIdx
+            andl  spritemask+{5*SPRITE_PLANE_SPAN}+2,x
+            oral  spritedata+{5*SPRITE_PLANE_SPAN}+2,x
+            sta   $A2,s
 
-                 tsc
-                 adc   #320
-                 tcs
+            tsc
+            adc   #320
+            tcs
 
-                 lda   tiledata+{6*TILE_DATA_SPAN},y
-                 ldx   spriteIdx+2
-                 andl  spritemask+{6*SPRITE_PLANE_SPAN},x
-                 oral  spritedata+{6*SPRITE_PLANE_SPAN},x
-                 ldx   spriteIdx
-                 andl  spritemask+{6*SPRITE_PLANE_SPAN},x
-                 oral  spritedata+{6*SPRITE_PLANE_SPAN},x
-                 sta   $00,s
+            lda   tiledata+{6*TILE_DATA_SPAN},y
+            ldx   spriteIdx+2
+            andl  spritemask+{6*SPRITE_PLANE_SPAN},x
+            oral  spritedata+{6*SPRITE_PLANE_SPAN},x
+            ldx   spriteIdx
+            andl  spritemask+{6*SPRITE_PLANE_SPAN},x
+            oral  spritedata+{6*SPRITE_PLANE_SPAN},x
+            sta   $00,s
 
-                 lda   tiledata+{6*TILE_DATA_SPAN}+2,y
-                 ldx   spriteIdx+2
-                 andl  spritemask+{6*SPRITE_PLANE_SPAN}+2,x
-                 oral  spritedata+{6*SPRITE_PLANE_SPAN}+2,x
-                 ldx   spriteIdx
-                 andl  spritemask+{6*SPRITE_PLANE_SPAN}+2,x
-                 oral  spritedata+{6*SPRITE_PLANE_SPAN}+2,x
-                 sta   $02,s
+            lda   tiledata+{6*TILE_DATA_SPAN}+2,y
+            ldx   spriteIdx+2
+            andl  spritemask+{6*SPRITE_PLANE_SPAN}+2,x
+            oral  spritedata+{6*SPRITE_PLANE_SPAN}+2,x
+            ldx   spriteIdx
+            andl  spritemask+{6*SPRITE_PLANE_SPAN}+2,x
+            oral  spritedata+{6*SPRITE_PLANE_SPAN}+2,x
+            sta   $02,s
 
-                 lda   tiledata+{7*TILE_DATA_SPAN},y
-                 ldx   spriteIdx+2
-                 andl  spritemask+{7*SPRITE_PLANE_SPAN},x
-                 oral  spritedata+{7*SPRITE_PLANE_SPAN},x
-                 ldx   spriteIdx
-                 andl  spritemask+{7*SPRITE_PLANE_SPAN},x
-                 oral  spritedata+{7*SPRITE_PLANE_SPAN},x
-                 sta   $A0,s
+            lda   tiledata+{7*TILE_DATA_SPAN},y
+            ldx   spriteIdx+2
+            andl  spritemask+{7*SPRITE_PLANE_SPAN},x
+            oral  spritedata+{7*SPRITE_PLANE_SPAN},x
+            ldx   spriteIdx
+            andl  spritemask+{7*SPRITE_PLANE_SPAN},x
+            oral  spritedata+{7*SPRITE_PLANE_SPAN},x
+            sta   $A0,s
 
-                 lda   tiledata+{7*TILE_DATA_SPAN}+2,y
-                 ldx   spriteIdx+2
-                 andl  spritemask+{7*SPRITE_PLANE_SPAN}+2,x
-                 oral  spritedata+{7*SPRITE_PLANE_SPAN}+2,x
-                 ldx   spriteIdx
-                 andl  spritemask+{7*SPRITE_PLANE_SPAN}+2,x
-                 oral  spritedata+{7*SPRITE_PLANE_SPAN}+2,x
-                 sta   $A2,s
+            lda   tiledata+{7*TILE_DATA_SPAN}+2,y
+            ldx   spriteIdx+2
+            andl  spritemask+{7*SPRITE_PLANE_SPAN}+2,x
+            oral  spritedata+{7*SPRITE_PLANE_SPAN}+2,x
+            ldx   spriteIdx
+            andl  spritemask+{7*SPRITE_PLANE_SPAN}+2,x
+            oral  spritedata+{7*SPRITE_PLANE_SPAN}+2,x
+            sta   $A2,s
 
-                 _R0W0
+            _R0W0
 
-                 lda   stkSave
-                 tcs
-                 cli
-                 rts
+            lda   stkSave
+            tcs
+            cli
+            rts
 
 ; There is only one sprite at this tile, so do a fast blit that directly combines a tile with a single
 ; sprite and renders directly to the screen
 ;
 ; NOTE: Expect X-register to already have been set to the correct VBUFF address
-BlitOneSprite
-                 ldy   tileAddr                               ; load the address of this tile's data
-                 lda   screenAddr                             ; Get the on-screen address of this tile
+OneSpriteDirty
+            ldy   tileAddr                               ; load the address of this tile's data
+            lda   screenAddr                             ; Get the on-screen address of this tile
 
-                 plb
+            plb
 
-                 phd
-                 sei
-                 clc
-                 tcd
+            phd
+            sei
+            clc
+            tcd
 
-                 _R0W1
+            _R0W1
 
-                 lda   tiledata+{0*TILE_DATA_SPAN},y
-                 andl  spritemask+{0*SPRITE_PLANE_SPAN},x
-                 oral  spritedata+{0*SPRITE_PLANE_SPAN},x
-                 sta   $00
+            lda   tiledata+{0*TILE_DATA_SPAN},y
+            andl  spritemask+{0*SPRITE_PLANE_SPAN},x
+            oral  spritedata+{0*SPRITE_PLANE_SPAN},x
+            sta   $00
 
-                 lda   tiledata+{0*TILE_DATA_SPAN}+2,y
-                 andl  spritemask+{0*SPRITE_PLANE_SPAN}+2,x
-                 oral  spritedata+{0*SPRITE_PLANE_SPAN}+2,x
-                 sta   $02
+            lda   tiledata+{0*TILE_DATA_SPAN}+2,y
+            andl  spritemask+{0*SPRITE_PLANE_SPAN}+2,x
+            oral  spritedata+{0*SPRITE_PLANE_SPAN}+2,x
+            sta   $02
 
-                 lda   tiledata+{1*TILE_DATA_SPAN},y
-                 andl  spritemask+{1*SPRITE_PLANE_SPAN},x
-                 oral  spritedata+{1*SPRITE_PLANE_SPAN},x
-                 sta   $A0
+            lda   tiledata+{1*TILE_DATA_SPAN},y
+            andl  spritemask+{1*SPRITE_PLANE_SPAN},x
+            oral  spritedata+{1*SPRITE_PLANE_SPAN},x
+            sta   $A0
 
-                 lda   tiledata+{1*TILE_DATA_SPAN}+2,y
-                 andl  spritemask+{1*SPRITE_PLANE_SPAN}+2,x
-                 oral  spritedata+{1*SPRITE_PLANE_SPAN}+2,x
-                 sta   $A2
+            lda   tiledata+{1*TILE_DATA_SPAN}+2,y
+            andl  spritemask+{1*SPRITE_PLANE_SPAN}+2,x
+            oral  spritedata+{1*SPRITE_PLANE_SPAN}+2,x
+            sta   $A2
 
-                 tdc
-                 adc   #320
-                 tcd
+            tdc
+            adc   #320
+            tcd
 
-                 lda   tiledata+{2*TILE_DATA_SPAN},y
-                 andl  spritemask+{2*SPRITE_PLANE_SPAN},x
-                 oral  spritedata+{2*SPRITE_PLANE_SPAN},x
-                 sta   $00
+            lda   tiledata+{2*TILE_DATA_SPAN},y
+            andl  spritemask+{2*SPRITE_PLANE_SPAN},x
+            oral  spritedata+{2*SPRITE_PLANE_SPAN},x
+            sta   $00
 
-                 lda   tiledata+{2*TILE_DATA_SPAN}+2,y
-                 andl  spritemask+{2*SPRITE_PLANE_SPAN}+2,x
-                 oral  spritedata+{2*SPRITE_PLANE_SPAN}+2,x
-                 sta   $02
+            lda   tiledata+{2*TILE_DATA_SPAN}+2,y
+            andl  spritemask+{2*SPRITE_PLANE_SPAN}+2,x
+            oral  spritedata+{2*SPRITE_PLANE_SPAN}+2,x
+            sta   $02
 
-                 lda   tiledata+{3*TILE_DATA_SPAN},y
-                 andl  spritemask+{3*SPRITE_PLANE_SPAN},x
-                 oral  spritedata+{3*SPRITE_PLANE_SPAN},x
-                 sta   $A0
+            lda   tiledata+{3*TILE_DATA_SPAN},y
+            andl  spritemask+{3*SPRITE_PLANE_SPAN},x
+            oral  spritedata+{3*SPRITE_PLANE_SPAN},x
+            sta   $A0
 
-                 lda   tiledata+{3*TILE_DATA_SPAN}+2,y
-                 andl  spritemask+{3*SPRITE_PLANE_SPAN}+2,x
-                 oral  spritedata+{3*SPRITE_PLANE_SPAN}+2,x
-                 sta   $A2
+            lda   tiledata+{3*TILE_DATA_SPAN}+2,y
+            andl  spritemask+{3*SPRITE_PLANE_SPAN}+2,x
+            oral  spritedata+{3*SPRITE_PLANE_SPAN}+2,x
+            sta   $A2
 
-                 tdc
-                 adc   #320
-                 tcd
+            tdc
+            adc   #320
+            tcd
 
-                 lda   tiledata+{4*TILE_DATA_SPAN},y
-                 andl  spritemask+{4*SPRITE_PLANE_SPAN},x
-                 oral  spritedata+{4*SPRITE_PLANE_SPAN},x
-                 sta   $00
+            lda   tiledata+{4*TILE_DATA_SPAN},y
+            andl  spritemask+{4*SPRITE_PLANE_SPAN},x
+            oral  spritedata+{4*SPRITE_PLANE_SPAN},x
+            sta   $00
 
-                 lda   tiledata+{4*TILE_DATA_SPAN}+2,y
-                 andl  spritemask+{4*SPRITE_PLANE_SPAN}+2,x
-                 oral  spritedata+{4*SPRITE_PLANE_SPAN}+2,x
-                 sta   $02
+            lda   tiledata+{4*TILE_DATA_SPAN}+2,y
+            andl  spritemask+{4*SPRITE_PLANE_SPAN}+2,x
+            oral  spritedata+{4*SPRITE_PLANE_SPAN}+2,x
+            sta   $02
 
-                 lda   tiledata+{5*TILE_DATA_SPAN},y
-                 andl  spritemask+{5*SPRITE_PLANE_SPAN},x
-                 oral  spritedata+{5*SPRITE_PLANE_SPAN},x
-                 sta   $A0
+            lda   tiledata+{5*TILE_DATA_SPAN},y
+            andl  spritemask+{5*SPRITE_PLANE_SPAN},x
+            oral  spritedata+{5*SPRITE_PLANE_SPAN},x
+            sta   $A0
 
-                 lda   tiledata+{5*TILE_DATA_SPAN}+2,y
-                 andl  spritemask+{5*SPRITE_PLANE_SPAN}+2,x
-                 oral  spritedata+{5*SPRITE_PLANE_SPAN}+2,x
-                 sta   $A2
+            lda   tiledata+{5*TILE_DATA_SPAN}+2,y
+            andl  spritemask+{5*SPRITE_PLANE_SPAN}+2,x
+            oral  spritedata+{5*SPRITE_PLANE_SPAN}+2,x
+            sta   $A2
 
-                 tdc
-                 adc   #320
-                 tcd
+            tdc
+            adc   #320
+            tcd
 
-                 lda   tiledata+{6*TILE_DATA_SPAN},y
-                 andl  spritemask+{6*SPRITE_PLANE_SPAN},x
-                 oral  spritedata+{6*SPRITE_PLANE_SPAN},x
-                 sta   $00
+            lda   tiledata+{6*TILE_DATA_SPAN},y
+            andl  spritemask+{6*SPRITE_PLANE_SPAN},x
+            oral  spritedata+{6*SPRITE_PLANE_SPAN},x
+            sta   $00
 
-                 lda   tiledata+{6*TILE_DATA_SPAN}+2,y
-                 andl  spritemask+{6*SPRITE_PLANE_SPAN}+2,x
-                 oral  spritedata+{6*SPRITE_PLANE_SPAN}+2,x
-                 sta   $02
+            lda   tiledata+{6*TILE_DATA_SPAN}+2,y
+            andl  spritemask+{6*SPRITE_PLANE_SPAN}+2,x
+            oral  spritedata+{6*SPRITE_PLANE_SPAN}+2,x
+            sta   $02
 
-                 lda   tiledata+{7*TILE_DATA_SPAN},y
-                 andl  spritemask+{7*SPRITE_PLANE_SPAN},x
-                 oral  spritedata+{7*SPRITE_PLANE_SPAN},x
-                 sta   $A0
+            lda   tiledata+{7*TILE_DATA_SPAN},y
+            andl  spritemask+{7*SPRITE_PLANE_SPAN},x
+            oral  spritedata+{7*SPRITE_PLANE_SPAN},x
+            sta   $A0
 
-                 lda   tiledata+{7*TILE_DATA_SPAN}+2,y
-                 andl  spritemask+{7*SPRITE_PLANE_SPAN}+2,x
-                 oral  spritedata+{7*SPRITE_PLANE_SPAN}+2,x
-                 sta   $A2
+            lda   tiledata+{7*TILE_DATA_SPAN}+2,y
+            andl  spritemask+{7*SPRITE_PLANE_SPAN}+2,x
+            oral  spritedata+{7*SPRITE_PLANE_SPAN}+2,x
+            sta   $A2
 
-                 _R0W0
-                 cli
-                 pld
-                 rts 
+            _R0W0
+            cli
+            pld
+            rts
diff --git a/src/Script.s b/src/Script.s
index bbeb01d..87028a7 100644
--- a/src/Script.s
+++ b/src/Script.s
@@ -33,18 +33,13 @@
 ;
 ; A pointer to the current command instruction is stored in the first 4 bytes of the 
 ; timer's user data section.
-StartScript    ENT
-               phb
-               phk
-               plb
-
-               phx                      ; Save the script array address
+_StartScript   phx                      ; Save the script array address
                pha
 
                lda   #_DoScriptSeq      ; Try to create a timer for this script
                ldx   #^_DoScriptSeq
                clc
-               jsl   AddTimer
+               jsr   _AddTimer
                bcs   :err               ; No timer slots available :(
 
                tax                      ; Initialize the UserData with the command pointer
@@ -52,15 +47,12 @@ StartScript    ENT
                sta   Timers+8,x
                pla
                sta   Timers+10,x
-
-               plb
-               rtl
+               rts
 
 :err
                pla                      ; Pop the values and return with the carry flag set
                pla
-               plb
-               rtl
+               rts
 
 ; This routine executes script command until it encounters one with the STOP bit set.  In some
 ; sense, the stop bit acts like a "yield" in high-level languages.
@@ -69,14 +61,6 @@ ARG1           equ   2
 ARG2           equ   4
 ARG3           equ   6
 
-DoScriptSeq    ENT
-               phb
-               phk
-               plb
-               jsl   _DoScriptSeq       ; Yes, this is a special JSL, because _DoScriptSeq is a time callback
-               plb
-               rtl
-
 _DoScriptSeq
                phx                      ; save the timer index; will need to update user data at the end
                phb                      ; save the current data bank
@@ -99,6 +83,7 @@ _dss_loop      phx                      ; Save the command address
                txy                      ; Cache in the y-register
 
                lda:  0,x                ; Load the command word
+
                pha                      ; Stash it
 
                and   #$001E             ; Only have 16 built-in commands.  Use the _UserCallback
@@ -116,18 +101,20 @@ _dss_cmd_rtn
 ; to the next entry.
                bit   #JUMP              ; Just do a fall through and set the jump offset to
                bne   :move_addr         ; a hard-coded value of 1 if the jump bit is not set
-:retry         lda   #$0100
-:move_addr     and   #$0F00             ; mask out the number of commands to move
+:retry         lda   #$0040
+:move_addr     and   #$0FC0             ; mask out the number of commands to move
                beq   :retry             ; Don't allow zeros; will cause infinite loop.  Just advance by one.
 
-               xba                      ; put it in the low byte
-               cmp   #$0008             ; Sign-extend the 4-bit value
+               cmp   #$0800             ; Sign-extend the 6-bit value
                bcc   *+5
-               ora   #$FFF0
+               ora   #$F000
 
-               asl                      ; multiply by 8
-               asl
-               asl
+               cmp   #$8000             ; make it a multiple of 8 (preserve sign)
+               ror
+               cmp   #$8000
+               ror
+               cmp   #$8000
+               ror
                clc
                adc   3,s                ; add it to the saved command address
                sta   3,s
@@ -175,14 +162,14 @@ _SetDTile
                ldx:  ARG1,y
                lda:  ARG2,y
                tay
-               jsl   CopyTileToDyn
+               jsr   CopyTileToDyn
                brl   _dss_cmd_rtn
 
 _UserCallback
                lda:  ARG1,y
-               sta   :dispatch+1
+               stal  :dispatch+1
                lda:  ARG1+1,y
-               sta   :dispatch+2
+               stal  :dispatch+2
                lda:  ARG3,y
 :dispatch      jsl   $000000
                brl   _dss_cmd_rtn
diff --git a/src/Sprite.s b/src/Sprite.s
index b50cd47..6632a3b 100644
--- a/src/Sprite.s
+++ b/src/Sprite.s
@@ -19,37 +19,321 @@ InitSprites
            cpx    #$FFFE
            bne    :loop2
 
-; Clear values in the sprite array
+; Initialize the VBuff offset values for the different cases. These are locations in
+; the TileStoreLookup table, which has different dimensions than the underlying TileStore
+; array
 
-           ldx    #{MAX_SPRITES-1}*2
-:loop3     stz    _Sprites+TILE_STORE_ADDR_1,x
-           dex
-           dex
-           bpl    :loop3
-
-; Initialize the VBUFF address offsets in the data and mask banks for each sprite
-;
-; The internal grid 13 tiles wide where each sprite has a 2x2 interior square with a
-; tile-size buffer all around. We pre-render each sprite with all four vert/horz flips
-VBUFF_STRIDE_BYTES   equ 13*4
-VBUFF_TILE_ROW_BYTES equ 8*VBUFF_STRIDE_BYTES
-VBUFF_SPRITE_STEP    equ VBUFF_TILE_ROW_BYTES*3
-VBUFF_SPRITE_START   equ {8*VBUFF_TILE_ROW_BYTES}+4
+LAST_ROW          equ {2*TS_LOOKUP_SPAN*{TILE_STORE_HEIGHT-1}}
+NEXT_TO_LAST_ROW  equ {2*TS_LOOKUP_SPAN*{TILE_STORE_HEIGHT-2}}
+LAST_COL          equ {{TILE_STORE_WIDTH-1}*2}
+NEXT_TO_LAST_COL  equ {{TILE_STORE_WIDTH-2}*2}
 
+           lda    #0                          ; Normal row, Normal column
            ldx    #0
-           lda    #VBUFF_SPRITE_START
-           clc
-:loop4     sta    _Sprites+VBUFF_ADDR,x
-           adc    #VBUFF_SPRITE_STEP
-           inx
-           inx
-           cpx    #MAX_SPRITES*2
-           bcc    :loop4
+           jsr    _SetVBuffValues
+
+           lda    #8
+           ldx    #LAST_COL                   ; Normal row, Last column
+           jsr    _SetVBuffValues
+
+           lda    #16
+           ldx    #NEXT_TO_LAST_COL           ; Normal row, Next-to-Last column
+           jsr    _SetVBuffValues
+
+           lda    #24                         ; Last row, normal column
+           ldx    #LAST_ROW
+           jsr    _SetVBuffValues
+
+           lda    #32
+           ldx    #LAST_ROW+LAST_COL          ; Last row, Last column
+           jsr    _SetVBuffValues
+
+           lda    #40
+           ldx    #LAST_ROW+NEXT_TO_LAST_COL  ; Last row, Next-to-Last column
+           jsr    _SetVBuffValues
+
+           lda    #48                         ; Next-to-Last row, normal column
+           ldx    #NEXT_TO_LAST_ROW
+           jsr    _SetVBuffValues
+
+           lda    #56
+           ldx    #NEXT_TO_LAST_ROW+LAST_COL          ; Next-to-Last row, Last column
+           jsr    _SetVBuffValues
+
+           lda    #64
+           ldx    #NEXT_TO_LAST_ROW+NEXT_TO_LAST_COL  ; Next-to-Last row, Next-to-Last column
+           jsr    _SetVBuffValues
+
+; Initialize the Page 2 pointers
+            ldx    #$100
+            lda    #^spritemask
+            sta    sprite_ptr0+2,x
+            sta    sprite_ptr1+2,x
+            sta    sprite_ptr2+2,x
+            sta    sprite_ptr3+2,x
 
 ; Precalculate some bank values
-           jsr    _CacheSpriteBanks
-           rts
+            jsr    _CacheSpriteBanks
+            rts
 
+; Call with X-register set to TileStore tile and A set to the VBuff slot offset
+_SetVBuffValues
+COL_BYTES  equ 4                                   ; VBUFF_TILE_COL_BYTES
+ROW_BYTES  equ 384                                 ; VBUFF_TILE_ROW_BYTES
+
+           clc
+           adc   #VBuffArray
+           sec
+           sbc   TileStoreLookup,x
+           sta   tmp0
+
+           ldy   TileStoreLookup,x
+           lda   #{0*COL_BYTES}+{0*ROW_BYTES}
+           sta   (tmp0),y
+
+           ldy   TileStoreLookup+2,x
+           lda   #{1*COL_BYTES}+{0*ROW_BYTES}
+           sta   (tmp0),y
+
+           ldy   TileStoreLookup+4,x
+           lda   #{2*COL_BYTES}+{0*ROW_BYTES}
+           sta   (tmp0),y
+
+           ldy   TileStoreLookup+{1*{TS_LOOKUP_SPAN*2}},x
+           lda   #{0*COL_BYTES}+{1*ROW_BYTES}
+           sta   (tmp0),y
+
+           ldy   TileStoreLookup+{1*{TS_LOOKUP_SPAN*2}}+2,x
+           lda   #{1*COL_BYTES}+{1*ROW_BYTES}
+           sta   (tmp0),y
+
+           ldy   TileStoreLookup+{1*{TS_LOOKUP_SPAN*2}}+4,x
+           lda   #{2*COL_BYTES}+{1*ROW_BYTES}
+           sta   (tmp0),y
+
+           ldy   TileStoreLookup+{2*{TS_LOOKUP_SPAN*2}},x
+           lda   #{0*COL_BYTES}+{2*ROW_BYTES}
+           sta   (tmp0),y
+
+           ldy   TileStoreLookup+{2*{TS_LOOKUP_SPAN*2}}+2,x
+           lda   #{1*COL_BYTES}+{2*ROW_BYTES}
+           sta   (tmp0),y
+
+           ldy   TileStoreLookup+{2*{TS_LOOKUP_SPAN*2}}+4,x
+           lda   #{2*COL_BYTES}+{2*ROW_BYTES}
+           sta   (tmp0),y
+            rts
+; _RenderSprites
+;
+; The function is responsible for updating all of the rendering information based on any changes
+; that occured to the sprites on this frame. Sprite handling is one of the most expensive and 
+; complicated pieces of the rendering pipeline, so these functions are aggressively simplified and
+; optimized.
+;
+; The sprite rendering pipeline is:
+;
+; 0. Check if any new sprites have been added by testing the DIRTY_BIT_SPRITE_ARRAY. If so, then
+;    the activeSpriteList (a 32-byte array on the direct page) is rebuilt from the SpriteBits bitmap
+;    word.
+;
+; Next, the activeSpriteList is scanned for changes to specific sprites. If the screen has been
+; scrolled, then every sprite is considered to have the SPRITE_STATUS_MOVED flag set.
+;
+; 1. If a sprite is marked as (SPRITE_STATUS_MOVED or SPRITE_STATUS_UPDATED or SPRITE_STATUS_ADDED) and not SPRITE_STATUS_REMOVED
+;    A. Calculate the TS_COVERAGE_SIZE, TS_LOOKUP_INDEX, and TS_VBUFF_BASE for the sprite
+;    B. For each tile the sprite overlaps with:
+;       i.   Set its bit in the TileStore's TS_SPRITE_FLAG
+;       ii.  Add the tile to the DirtyTile list
+;       iii. Set the VBUFF address for the sprite block
+;    C. If the sprite is not marked as SPRITE_STATUS_ADDED
+;       i.  For each old tile the sprite overlaps with
+;          a. If it is not marked in the DirtyTile list
+;             * Clear its bit from the TileStore's TS_SPRITE_FLAG
+;             * Add the tile to the DirtyTile list
+;t
+; 2. If a sprite is marked as SPRITE_STATUS_REMOVED, then
+;    A. Clear its bit from the SpriteBits bitmap
+;    B. For each tile the sprite overlaps with:
+;       i.  Clear its bit from the TileStore's TS_SPRITE_FLAG
+;       ii. Add the tile to the DirtyTile list
+;    C. Clear the SPRITE_STATUS flags (work complete)
+;
+; 3. For each tile on the Dirty Tile list
+;    A. Place the sprite VBUFF addresses in TS_VBUFF_ADDR_0 through TS_VBUFF_ADDR_3 and set TS_VBUFF_ADDR_COUNT
+;
+; It is important that this work is done *prior* to any tile map updates so that we can interate over the
+; DirtyTile list and *know* that it only contains tiles that are impacted by sprite changes.
+_RenderSprites
+
+; Check to see if any sprites have been added or removed.  If so, then we regenerate the active
+; sprite list.  Since adding and removing sprites is rare, this is a worthwhile tradeoff, because
+; there are several places where we want to iterate over the all of the sprites, and having a list
+; and not have to constantly load and test the SPRITE_STATUS just to skip unused slots can help
+; streamline the code.
+
+            lda   #DIRTY_BIT_SPRITE_ARRAY
+            trb   DirtyBits                        ; clears the flag, if it was set
+            beq   :no_rebuild
+            jsr   RebuildSpriteArray
+
+:no_rebuild
+
+; First step is to look at the StartX and StartY values.  If the screen has scrolled, then it has
+; the same effect as moving all of the sprites.
+;
+; OPTIMIZATION NOTE: Should check that the sprite actually changes position.  If the screen scrolls
+;                    by +X, but the sprite moves by -X (so it's relative position is unchanged), then
+;                    it does NOT need to be marked as dirty.
+
+            stz   ForceSpriteFlag
+            lda   StartX
+            cmp   OldStartX
+            bne   :force_update
+
+            lda   StartY
+            cmp   OldStartY
+            beq   :no_change
+
+:force_update
+            lda   #SPRITE_STATUS_MOVED
+            sta   ForceSpriteFlag
+:no_change
+
+; Dispatch to the update process for sprites. By pre-building the list, we know exactly
+; how many sprite to process and they are in a contiguous array.  So we don't have to keep
+; track of an iteration variable
+
+            ldx   ActiveSpriteCount
+            jmp   (phase1,x)
+
+; Implement the logic for updating sprite and tile rendering information. Each iteration of the 
+; ActiveSpriteCount will call this routine with the Y-register set to the sprite index
+_DoPhase1
+            lda   _Sprites+SPRITE_STATUS,y
+            ora   ForceSpriteFlag
+
+; First step, if a sprite is being removed, then we just have to clear its old tile information
+; and mark the tiles it overlapped as dirty.
+
+            bit   #SPRITE_STATUS_REMOVED
+            beq   :no_clear
+
+            lda   _SpriteBits,y                   ; Clear from the sprite bitmap
+            sta   SpriteRemovedFlag               ; Stick a non-zero value here
+            trb   SpriteMap
+            lda   #SPRITE_STATUS_EMPTY            ; Mark as empty so no error if we try to Add a sprite here again
+            sta   _Sprites+SPRITE_STATUS,y
+
+            jmp   _ClearSpriteFromTileStore       ; Clear the tile flags, add to the dirty tile list and done
+
+; Need to calculate new VBUFF information.  The could be required for UPDATED, ADDED or MOVED
+; sprites, so we do it unconditionally, but we do need to mark the current sprite for erasure if
+; needed
+:no_clear
+
+; If the sprite is marked as ADDED, then it does not need to have its old tile locations cleared
+
+            bit   #SPRITE_STATUS_ADDED
+            bne   :no_move
+
+; If the sprite was not ADDED and also not MOVED, then there is no reason to erase the old tiles
+; because they will be overwritten anyway.
+
+            bit   #SPRITE_STATUS_MOVED
+            beq   :no_move
+
+            phy
+            jsr   _ClearSpriteFromTileStore
+            ply
+
+; Anything else (MOVED, UPDATED, ADDED) will need to have the VBUFF information updated and the 
+; current tiles marked for update
+:no_move
+            jsr   _CalcDirtySprite                     ; This function preserves Y
+
+            lda   #SPRITE_STATUS_OCCUPIED              ; Clear the dirty bits (ADDED, UPDATED, MOVED)
+            sta   _Sprites+SPRITE_STATUS,y
+
+            jmp   _MarkDirtySpriteTiles
+
+; Dispatch table.  It's unintersting, so it's tucked out of the way
+phase1      dw    :phase1_0
+            dw    :phase1_1,:phase1_2,:phase1_3,:phase1_4
+            dw    :phase1_5,:phase1_6,:phase1_7,:phase1_8
+            dw    :phase1_9,:phase1_10,:phase1_11,:phase1_12
+            dw    :phase1_13,:phase1_14,:phase1_15,:phase1_16
+:phase1_16  ldy   activeSpriteList+30
+            jsr   _DoPhase1
+:phase1_15  ldy   activeSpriteList+28
+            jsr   _DoPhase1
+:phase1_14  ldy   activeSpriteList+26
+            jsr   _DoPhase1
+:phase1_13  ldy   activeSpriteList+24
+            jsr   _DoPhase1
+:phase1_12  ldy   activeSpriteList+22
+            jsr   _DoPhase1
+:phase1_11  ldy   activeSpriteList+20
+            jsr   _DoPhase1
+:phase1_10  ldy   activeSpriteList+18
+            jsr   _DoPhase1
+:phase1_9   ldy   activeSpriteList+16
+            jsr   _DoPhase1
+:phase1_8   ldy   activeSpriteList+14
+            jsr   _DoPhase1
+:phase1_7   ldy   activeSpriteList+12
+            jsr   _DoPhase1
+:phase1_6   ldy   activeSpriteList+10
+            jsr   _DoPhase1
+:phase1_5   ldy   activeSpriteList+8
+            jsr   _DoPhase1
+:phase1_4   ldy   activeSpriteList+6
+            jsr   _DoPhase1
+:phase1_3   ldy   activeSpriteList+4
+            jsr   _DoPhase1
+:phase1_2   ldy   activeSpriteList+2
+            jsr   _DoPhase1
+:phase1_1   ldy   activeSpriteList
+            jmp   _DoPhase1
+:phase1_0   rts
+
+; Utility function to calculate the difference in tile positions between a sprite's current
+; position and it's previous position.  This gets interesting because the number of tiles
+; that a sprite covers can change based on the relative alignemen of the sprite with the
+; background.
+;
+; Ideally, we would be able to quickly calculate exactly which new background tiles a sprite
+; intersects with and which ones it has left to minimize the number of TileStore entries
+; that need to be updated.
+;
+; In the short-term, we just do an equality test which lets us know if the sprite is
+; covering the exact same tiles.
+
+
+; Render a sprite stamp into the sprite buffer.  Stamps exist independent of the sprites
+; and sprite reference a specific stamp.  This is necessary because it's common for a
+; sprite to change its graphic as its animating, but it is too costly to have to set up
+; the stamp every time.  So this allows users to create stamps in advance and then
+; assign them to the sprites as needed.
+;
+; Note that the user had full freedom to create a stamp at any VBUFF address, however,
+; without leaving a buffer around each stamp, graphical corruption will occur.  It is
+; recommended that the defines for VBUFF_SPRITE_START, VBUFF_TILE_ROW_BYTES and
+; VBUFF_TILE_COL_BYTES to calculate tile-aligned corner locations to lay out the 
+; sprite stamps in VBUFF memory.
+;
+; Input:
+;   A = sprite descriptor
+;   Y = vbuff address
+;
+; The Sprite[VBUFF_ADDR] property must be set to the vbuff address passed into this function
+; to bind the sprite stamp to the sprite record.
+_CreateSpriteStamp
+           pha                                       ; Save the descriptor
+           jsr   _GetBaseTileAddr                    ; Get the address of the tile data
+
+           tax                                       ; Tile data address
+           pla                                       ; Pop the sprite ID
+           jmp   _DrawSpriteStamp                    ; Render the sprite data and create a stamp
 
 ; Add a new sprite to the rendering pipeline
 ;
@@ -70,17 +354,9 @@ VBUFF_SPRITE_START   equ {8*VBUFF_TILE_ROW_BYTES}+4
 ; the vertical tiles are taken from tileId + 32.  This is why tile sheets should be saved
 ; with a width of 256 pixels.
 ;
-; A = tileId + flags
+; A = vbuffAddress
 ; Y = High Byte = x-pos, Low Byte = y-pos
 ; X = Sprite Slot (0 - 15)
-AddSprite   ENT
-            phb
-            phk
-            plb
-            jsr    _AddSprite
-            plb
-            rtl
-
 _AddSprite
             pha
             txa
@@ -90,12 +366,12 @@ _AddSprite
             pla
 
             sta   _Sprites+SPRITE_ID,x          ; Keep a copy of the full descriptor
-            jsr   _GetBaseTileAddr              ; This applies the TILE_ID_MASK
-            sta   _Sprites+TILE_DATA_OFFSET,x
 
             lda   #SPRITE_STATUS_OCCUPIED+SPRITE_STATUS_ADDED
             sta   _Sprites+SPRITE_STATUS,x
 
+            stz   _Sprites+VBUFF_ADDR,x         ; Clear the VBUFF address, just to initialize it
+ 
             phy
             tya
             and   #$00FF
@@ -106,7 +382,6 @@ _AddSprite
             sta   _Sprites+SPRITE_X,x           ; X coordinate
 
             jsr   _PrecalcAllSpriteInfo         ; Cache sprite property values (simple stuff)
-            jsr   _DrawSpriteSheet              ; Render the sprite into internal space
 
 ; Mark the dirty bit to indicate that the active sprite list needs to be rebuilt in the next
 ; render call
@@ -117,265 +392,112 @@ _AddSprite
             lda   _SpriteBits,x                 ; Get the bit flag for this sprite slot
             tsb   SpriteMap                     ; Mark it in the sprite map bit field
 
-            txa                                 ; And return the sprite ID
-            clc                                 ; Mark that the sprite was successfully added
-
             rts
 
-; Run through the list of tile store offsets that this sprite was last drawn into and mark
-; those tiles as dirty.  The largest number of tiles that a sprite could possibly cover is 20
-; (an unaligned 4x3 sprite), covering a 5x4 area of play field tiles.
+; Macro to make the unrolled loop more concise
 ;
-; Y register = sprite record index
-_CSFTS_Out  rts
+;   1. Load the tile store address from a fixed offset
+;   2. Clears the sprite bit from the TS_SPRITE_FLAG location
+;   3. Checks if the tile is dirty and marks it
+;   4. If the tile was dirty, save the tile store address to be added to the DirtyTiles list later
+TSClearSprite mac
+            ldy   TileStoreLookup+{]1},x
+
+            lda   TileStore+TS_SPRITE_FLAG,y
+            and   tmp0
+            sta   TileStore+TS_SPRITE_FLAG,y
+
+            lda   TileStore+TS_DIRTY,y
+            bne   next
+            inc
+            sta   TileStore+TS_DIRTY,y
+            
+            tya
+            ldy   DirtyTileCount
+            sta   DirtyTiles,y
+            iny
+            iny
+            sty   DirtyTileCount
+next
+            <<<
+
+; Alternate implementation that uses the TS_COVERAGE_SIZE and TS_LOOKUP_INDEX properties to
+; load the old values directly from the TileStoreLookup table, rather than caching them.
+; This is more efficient, because the work in MarkDirtySprite is independent of the
+; sprite size and, by inlining the _PushDirtyTile logic, we can save a fair amount of overhead
 _ClearSpriteFromTileStore
-            ldx   _Sprites+TILE_STORE_ADDR_1,y
-            beq   _CSFTS_Out
-            ldal  TileStore+TS_SPRITE_FLAG,x       ; Clear the bit in the bit field.  This seems wasteful, but
-            and   _SpriteBitsNot,y                 ; there is no indexed form of TSB/TRB and caching the value in
-            stal  TileStore+TS_SPRITE_FLAG,x       ; a direct page location, only saves 1 or 2 cycles per and costs 10.
-            jsr   _PushDirtyTileX
+            lda   _SpriteBitsNot,y                          ; Cache this value in a direct page location
+            sta   tmp0
+            ldx   _Sprites+TS_COVERAGE_SIZE,y
+            jmp   (csfts_tbl,x)
+csfts_tbl   dw    csfts_1x1,csfts_1x2,csfts_1x3,csfts_out
+            dw    csfts_2x1,csfts_2x2,csfts_2x3,csfts_out
+            dw    csfts_3x1,csfts_3x2,csfts_3x3,csfts_out
+            dw    csfts_out,csfts_out,csfts_out,csfts_out
 
-            ldx   _Sprites+TILE_STORE_ADDR_2,y
-            beq   _CSFTS_Out
-            ldal  TileStore+TS_SPRITE_FLAG,x
-            and   _SpriteBitsNot,y
-            stal  TileStore+TS_SPRITE_FLAG,x
-            jsr   _PushDirtyTileX
+csfts_out   rts
 
-            ldx   _Sprites+TILE_STORE_ADDR_3,y
-            beq   _CSFTS_Out
-            ldal  TileStore+TS_SPRITE_FLAG,x
-            and   _SpriteBitsNot,y
-            stal  TileStore+TS_SPRITE_FLAG,x
-            jsr   _PushDirtyTileX
-
-            ldx   _Sprites+TILE_STORE_ADDR_4,y
-            beq   _CSFTS_Out
-            ldal  TileStore+TS_SPRITE_FLAG,x
-            and   _SpriteBitsNot,y
-            stal  TileStore+TS_SPRITE_FLAG,x
-            jsr   _PushDirtyTileX
-
-            ldx   _Sprites+TILE_STORE_ADDR_5,y
-            beq   :out
-            ldal  TileStore+TS_SPRITE_FLAG,x
-            and   _SpriteBitsNot,y
-            stal  TileStore+TS_SPRITE_FLAG,x
-            jsr   _PushDirtyTileX
-
-            ldx   _Sprites+TILE_STORE_ADDR_6,y
-            beq   :out
-            ldal  TileStore+TS_SPRITE_FLAG,x
-            and   _SpriteBitsNot,y
-            stal  TileStore+TS_SPRITE_FLAG,x
-            jsr   _PushDirtyTileX
-
-            ldx   _Sprites+TILE_STORE_ADDR_7,y
-            beq   :out
-            ldal  TileStore+TS_SPRITE_FLAG,x
-            and   _SpriteBitsNot,y
-            stal  TileStore+TS_SPRITE_FLAG,x
-            jsr   _PushDirtyTileX
-
-            ldx   _Sprites+TILE_STORE_ADDR_8,y
-            beq   :out
-            ldal  TileStore+TS_SPRITE_FLAG,x
-            and   _SpriteBitsNot,y
-            stal  TileStore+TS_SPRITE_FLAG,x
-            jsr   _PushDirtyTileX
-
-            ldx   _Sprites+TILE_STORE_ADDR_9,y
-            beq   :out
-            ldal  TileStore+TS_SPRITE_FLAG,x
-            and   _SpriteBitsNot,y
-            stal  TileStore+TS_SPRITE_FLAG,x
-            jmp   _PushDirtyTileX
-
-:out        rts
-
-; This function looks at the sprite list and renders the sprite plane data into the appropriate
-; tiles in the code field.  There are a few phases to this routine.  The assumption is that
-; any sprite that needs to be re-drawn has been marked as DIRTY or DAMAGED.
-;
-; A DIRTY sprite is one that has moved, so it needs to be erased/redrawn in the sprite
-; buffer AND the tiles it covers marked for refresh.  A DAMAGED sprite shared one or more
-; tiles with a DIRTY sprite, so it needs to be redraw in the sprite buffer (but not erased!)
-; and its tile do NOT need to be marked for refresh.
-;
-; In the first phase, we run through the list of dirty sprites and erase them from their
-; OLD_VBUFF_ADDR.  This clears the sprite plane buffers.  We also iterate through the
-; TILE_STORE_ADDR_X array and mark all of the tile store location that this sprite had occupied
-; as dirty, as well as removing this sprite from the TS_SPRITE_FLAG bitfield.
-;
-; A final aspect is that any of the sprites indicated in the TS_SPRITE_FLAG are marked to be
-; drawn in the next phase (since a portion of their content may have been erased if they overlap)
-; 
-; In the second phase, the sprite is re-drawn into the sprite plane buffers and the appropriate
-; Tile Store locations are marked as dirty. It is important to recognize that the sprites themselves
-; can be marked dirty, and the underlying tiles in the tile store are independently marked dirty.
-
-phase1      dw    :phase1_0
-            dw    :phase1_1,:phase1_2,:phase1_3,:phase1_4
-            dw    :phase1_5,:phase1_6,:phase1_7,:phase1_8
-            dw    :phase1_9,:phase1_10,:phase1_11,:phase1_12
-            dw    :phase1_13,:phase1_14,:phase1_15,:phase1_16
-
-:phase1_16
-            ldy   activeSpriteList+30
-            jsr   _DoPhase1
-:phase1_15
-            ldy   activeSpriteList+28
-            jsr   _DoPhase1
-:phase1_14
-            ldy   activeSpriteList+26
-            jsr   _DoPhase1
-:phase1_13
-            ldy   activeSpriteList+24
-            jsr   _DoPhase1
-:phase1_12
-            ldy   activeSpriteList+22
-            jsr   _DoPhase1
-:phase1_11
-            ldy   activeSpriteList+20
-            jsr   _DoPhase1
-:phase1_10
-            ldy   activeSpriteList+18
-            jsr   _DoPhase1
-:phase1_9
-            ldy   activeSpriteList+16
-            jsr   _DoPhase1
-:phase1_8
-            ldy   activeSpriteList+14
-            jsr   _DoPhase1
-:phase1_7
-            ldy   activeSpriteList+12
-            jsr   _DoPhase1
-:phase1_6
-            ldy   activeSpriteList+10
-            jsr   _DoPhase1
-:phase1_5
-            ldy   activeSpriteList+8
-            jsr   _DoPhase1
-:phase1_4
-            ldy   activeSpriteList+6
-            jsr   _DoPhase1
-:phase1_3
-            ldy   activeSpriteList+4
-            jsr   _DoPhase1
-:phase1_2
-            ldy   activeSpriteList+2
-            jsr   _DoPhase1
-:phase1_1
-            ldy   activeSpriteList
-            jsr   _DoPhase1
-:phase1_0
-            jmp   phase1_rtn
-
-; If this sprite has been MOVED or REMOVED, then clear its bit from the TS_SPRITE_FLAG in
-; all of the tile store locations that it occupied on the previous frame and add those
-; tile store locations to the dirty tile list.
-_DoPhase1
-            lda   _Sprites+SPRITE_STATUS,y
-            ora   forceSpriteFlag
-            bit   #SPRITE_STATUS_MOVED+SPRITE_STATUS_REMOVED
-            beq   :no_clear
-            jsr   _ClearSpriteFromTileStore
-:no_clear
-
-; Check to see if sprite was REMOVED  If so, clear the sprite slot status
-
-            lda   _Sprites+SPRITE_STATUS,y
-            bit   #SPRITE_STATUS_REMOVED
-            beq   :out
-
-            lda   #SPRITE_STATUS_EMPTY            ; Mark as empty (zero value)
-            sta   _Sprites+SPRITE_STATUS,y
-
-            lda   _SpriteBits,y                   ; Clear from the sprite bitmap
-            trb   SpriteMap
-
-:out
+csfts_3x3   ldx   _Sprites+TS_LOOKUP_INDEX,y
+            TSClearSprite 0
+            TSClearSprite 2
+            TSClearSprite 4
+            TSClearSprite 1*{TS_LOOKUP_SPAN*2}+0
+            TSClearSprite 1*{TS_LOOKUP_SPAN*2}+2
+            TSClearSprite 1*{TS_LOOKUP_SPAN*2}+4
+            TSClearSprite 2*{TS_LOOKUP_SPAN*2}+0
+            TSClearSprite 2*{TS_LOOKUP_SPAN*2}+2
+            TSClearSprite 2*{TS_LOOKUP_SPAN*2}+4
             rts
 
-; Second phase takes care of drawing the sprites and marking the tiles that will need to be merged
-; with pixel data from the sprite plane
-phase2      dw    :phase2_0
-            dw    :phase2_1,:phase2_2,:phase2_3,:phase2_4
-            dw    :phase2_5,:phase2_6,:phase2_7,:phase2_8
-            dw    :phase2_9,:phase2_10,:phase2_11,:phase2_12
-            dw    :phase2_13,:phase2_14,:phase2_15,:phase2_16
+csfts_3x2   ldx   _Sprites+TS_LOOKUP_INDEX,y
+            TSClearSprite 0
+            TSClearSprite 2
+            TSClearSprite 1*{TS_LOOKUP_SPAN*2}+0
+            TSClearSprite 1*{TS_LOOKUP_SPAN*2}+2
+            TSClearSprite 2*{TS_LOOKUP_SPAN*2}+0
+            TSClearSprite 2*{TS_LOOKUP_SPAN*2}+2
+            rts
 
-:phase2_16
-            ldy   activeSpriteList+30
-            jsr   _DoPhase2
-:phase2_15
-            ldy   activeSpriteList+28
-            jsr   _DoPhase2
-:phase2_14
-            ldy   activeSpriteList+26
-            jsr   _DoPhase2
-:phase2_13
-            ldy   activeSpriteList+24
-            jsr   _DoPhase2
-:phase2_12
-            ldy   activeSpriteList+22
-            jsr   _DoPhase2
-:phase2_11
-            ldy   activeSpriteList+20
-            jsr   _DoPhase2
-:phase2_10
-            ldy   activeSpriteList+18
-            jsr   _DoPhase2
-:phase2_9
-            ldy   activeSpriteList+16
-            jsr   _DoPhase2
-:phase2_8
-            ldy   activeSpriteList+14
-            jsr   _DoPhase2
-:phase2_7
-            ldy   activeSpriteList+12
-            jsr   _DoPhase2
-:phase2_6
-            ldy   activeSpriteList+10
-            jsr   _DoPhase2
-:phase2_5
-            ldy   activeSpriteList+8
-            jsr   _DoPhase2
-:phase2_4
-            ldy   activeSpriteList+6
-            jsr   _DoPhase2
-:phase2_3
-            ldy   activeSpriteList+4
-            jsr   _DoPhase2
-:phase2_2
-            ldy   activeSpriteList+2
-            jsr   _DoPhase2
-:phase2_1
-            ldy   activeSpriteList
-            jsr   _DoPhase2
-:phase2_0
-            jmp   phase2_rtn
+csfts_3x1   ldx   _Sprites+TS_LOOKUP_INDEX,y
+            TSClearSprite 0
+            TSClearSprite 1*{TS_LOOKUP_SPAN*2}+0
+            TSClearSprite 2*{TS_LOOKUP_SPAN*2}+0
+            rts
 
-_DoPhase2
-            lda   _Sprites+SPRITE_STATUS,y
-            beq   :out                          ; If phase 1 marked us as empty, do nothing
-            ora   forceSpriteFlag
-            and   #SPRITE_STATUS_ADDED+SPRITE_STATUS_MOVED+SPRITE_STATUS_UPDATED
-            beq   :out
+csfts_2x3   ldx   _Sprites+TS_LOOKUP_INDEX,y
+            TSClearSprite 0
+            TSClearSprite 2
+            TSClearSprite 4
+            TSClearSprite 1*{TS_LOOKUP_SPAN*2}+0
+            TSClearSprite 1*{TS_LOOKUP_SPAN*2}+2
+            TSClearSprite 1*{TS_LOOKUP_SPAN*2}+4
+            rts
 
-; Last thing to do, so go ahead and clear the flags
+csfts_2x2   ldx   _Sprites+TS_LOOKUP_INDEX,y
+            TSClearSprite 0
+            TSClearSprite 2
+            TSClearSprite 1*{TS_LOOKUP_SPAN*2}+0
+            TSClearSprite 1*{TS_LOOKUP_SPAN*2}+2
+            rts
 
-            lda   #SPRITE_STATUS_OCCUPIED
-            sta   _Sprites+SPRITE_STATUS,y
+csfts_2x1   ldx   _Sprites+TS_LOOKUP_INDEX,y
+            TSClearSprite 0
+            TSClearSprite 1*{TS_LOOKUP_SPAN*2}+0
+            rts
 
-; Mark the appropriate tiles as dirty and as occupied by a sprite so that the ApplyTiles
-; subroutine will combine the sprite data with the tile data into the code field where it 
-; can be drawn to the screen.  This routine is also responsible for setting the specific
-; VBUFF address for each sprite's tile sheet position
+csfts_1x3   ldx   _Sprites+TS_LOOKUP_INDEX,y
+            TSClearSprite 0
+            TSClearSprite 2
+            TSClearSprite 4
+            rts
 
-            jmp   _MarkDirtySprite
-:out
+csfts_1x2   ldx   _Sprites+TS_LOOKUP_INDEX,y
+            TSClearSprite 0
+            TSClearSprite 2
+            rts
+
+csfts_1x1   ldx   _Sprites+TS_LOOKUP_INDEX,y
+            TSClearSprite 0
             rts
 
 ; Use the blttmp space to build the active sprite list.  Since the sprite tiles are not drawn until later,
@@ -383,7 +505,7 @@ _DoPhase2
 RebuildSpriteArray
             lda   SpriteMap                     ; Get the bit field
 
-; Unrolled loop to get the sprite index values that coorespond to the set bit positions
+; Unrolled loop to get the sprite index values that correspond to the set bit positions
 
             pea   $FFFF                         ; end-of-list marker
 ]step       equ   0
@@ -420,58 +542,6 @@ RebuildSpriteArray
             stx   ActiveSpriteCount
             rts
 
-forceSpriteFlag ds 2
-_RenderSprites
-
-; Check to see if any sprites have been added or removed.  If so, then we regenerate the active
-; sprite list.  Since adding and removing sprites is rare, this is a worthwhile tradeoff, because
-; there are several places where we want to iterate over the all of the sprites, and having a list
-; and not have to constantly load and test the SPRITE_STATUS just to skip unused slots can help
-; streamline the code.
-
-            lda   #DIRTY_BIT_SPRITE_ARRAY
-            trb   DirtyBits                        ; clears the flag, if it was set
-            beq   :no_rebuild
-            jsr   RebuildSpriteArray
-
-:no_rebuild
-
-; First step is to look at the StartX and StartY values.  If the screen has scrolled, then it has
-; the same effect as moving all of the sprites.
-;
-; OPTIMIZATION NOTE: Should check that the sprite actually changes position.  If the screen scrolls
-;                    by +X, but the sprite moves by -X (so it's relative position is unchanged), then
-;                    it does NOT need to be marked as dirty.
-
-            stz   forceSpriteFlag
-            lda   StartX
-            cmp   OldStartX
-            bne   :force_update
-
-            lda   StartY
-            cmp   OldStartY
-            beq   :no_change
-
-:force_update
-            lda   #SPRITE_STATUS_MOVED
-            sta   forceSpriteFlag
-:no_change
-
-; Dispatch to the first phase of rendering the sprites. By pre-building the list, we know exactly
-; how many sprite to process and they are in a contiguous array.  So we on't have to keep track
-; of an iterating variable
-
-            ldx   ActiveSpriteCount
-            jmp   (phase1,x)
-phase1_rtn
-
-; Dispatch to the second phase of rendering the sprites.
-            ldx   ActiveSpriteCount
-            jmp   (phase2,x)
-phase2_rtn
-
-            rts
-
 ; _GetTileAt
 ;
 ; Given a relative playfield coordinate [0, ScreenWidth), [0, ScreenHeight) return the
@@ -531,42 +601,29 @@ _CacheSpriteBanks
             ora    #^TileStore
             sta    TileStoreBankAndTileDataBank
 
+            xba
+            ldx    #$100
+            sta    DP2_TILEDATA_AND_TILESTORE_BANKS,x     ; put a reversed copy in the second direct page
+
+            lda    #>spritedata
+            and    #$FF00
+            ora    #^tiledata
+            sta    DP2_TILEDATA_AND_SPRITEDATA_BANKS,x
+
+            lda    #>spritedata
+            and    #$FF00
+            ora    #^TileStore
+            xba
+            ldx    #$100
+            sta    DP2_SPRITEDATA_AND_TILESTORE_BANKS,x     ; put a reversed copy in the second direct page
+
+            lda    #>TileStore
+            and    #$FF00
+            ora    #^TileStore
+            sta    TileStoreBankDoubled
+            
             rts
 
-; This is 13 blocks wide
-SPRITE_PLANE_SPAN equ VBUFF_STRIDE_BYTES        ; 52
-
-; A = x coordinate
-; Y = y coordinate
-;GetSpriteVBuffAddr ENT
-;            jsr   _GetSpriteVBuffAddr
-;            rtl
-
-; A = x coordinate
-; Y = y coordinate
-;_GetSpriteVBuffAddr
-;            pha
-;            tya
-;            clc
-;            adc   #NUM_BUFF_LINES               ; The virtual buffer has 24 lines of off-screen space
-;            xba                                 ; Each virtual scan line is 256 bytes wide for overdraw space
-;            clc
-;            adc   1,s
-;            sta   1,s
-;            pla
-;            rts
-
-; Version that uses temporary space (tmp15)
-;_GetSpriteVBuffAddrTmp
-;            sta   tmp15
-;            tya
-;            clc
-;            adc   #NUM_BUFF_LINES               ; The virtual buffer has 24 lines of off-screen space
-;            xba                                 ; Each virtual scan line is 256 bytes wide for overdraw space
-;            clc
-;            adc   tmp15
-;            rts
-
 ; Precalculate some cached values for a sprite.  These are *only* to make other part of code,
 ; specifically the draw/erase routines more efficient.
 ;
@@ -576,9 +633,15 @@ SPRITE_PLANE_SPAN equ VBUFF_STRIDE_BYTES        ; 52
 ; X = sprite index
 _PrecalcAllSpriteInfo
             lda   _Sprites+SPRITE_ID,x 
-            and   #$3E00
+;            and   #$3E00
             xba
-            sta   _Sprites+SPRITE_DISP,x        ; use bits 9 through 13 for full dispatch
+            and   #$0006
+
+            tay
+            lda   _Sprites+VBUFF_ADDR,x
+            clc
+            adc   _stamp_step,y
+            sta   _Sprites+SPRITE_DISP,x
 
 ; Set the sprite's width and height
             lda   #4
@@ -594,7 +657,7 @@ _PrecalcAllSpriteInfo
 :width_4
 
             lda   _Sprites+SPRITE_ID,x
-            bit   #$0800                        ; width select
+            bit   #$0800                        ; height select
             beq   :height_8
             lda   #16
             sta   _Sprites+SPRITE_HEIGHT,x
@@ -653,6 +716,7 @@ _PrecalcAllSpriteInfo
             sbc   _Sprites+SPRITE_CLIP_TOP,x
             inc
             sta   _Sprites+SPRITE_CLIP_HEIGHT,x
+
             rts
 
 :offscreen
@@ -664,97 +728,81 @@ _PrecalcAllSpriteInfo
 ; picked up in the next AddSprite.
 ;
 ; A = Sprite ID
-RemoveSprite ENT
-            phb
-            phk
-            plb
-            jsr    _RemoveSprite
-            plb
-            rtl
-
 _RemoveSprite
+            cmp   #MAX_SPRITES
+            bcc   :ok
+            rts
+
+:ok
+            asl
             tax
 
-_RemoveSpriteX
             lda   _Sprites+SPRITE_STATUS,x
             ora   #SPRITE_STATUS_REMOVED
             sta   _Sprites+SPRITE_STATUS,x
+
             rts
 
 ; Update the sprite's flags. We do not allow the size of a sprite to be changed.  That requires
 ; the sprite to be removed and re-added.
 ;
-; A = Sprite ID
-; X = Sprite Tile ID and Flags
-UpdateSprite ENT
-            phb
-            phk
-            plb
-            jsr    _UpdateSprite
-            plb
-            rtl
-
+; A = Sprite slot
+; X = New Sprite Flags
+; Y = New Sprite Stamp Address
 _UpdateSprite
-            phx                                 ; swap X/A to be more efficient
-            tax
-            pla
-
-_UpdateSpriteX
-            cpx   #MAX_SPRITES*2                ; Make sure we're in bounds
+            cmp   #MAX_SPRITES
             bcc   :ok
             rts
 
 :ok
-_UpdateSpriteXnc
-            cmp   _Sprites+SPRITE_ID,x          ; Don't do anything if there is no change
-            beq   :no_sprite_change
+            phx                                 ; Save X to swap into A
+            asl
+            tax
+            pla
 
+; Do some work to see if only the H or V bits have changed.  If so, merge them into the
+; SPRITE_ID
+            eor   _Sprites+SPRITE_ID,x          ; If either bit has changed, this will be non-zero
+            and   #SPRITE_VFLIP+SPRITE_HFLIP 
+            bne   :sprite_flag_change
+
+            tya
+            cmp   _Sprites+VBUFF_ADDR,x          ; Did the stamp change?
+            bne   :sprite_stamp_change
+            rts                                 ; Nothing changed, so just return
+
+:sprite_flag_change
+            eor   _Sprites+SPRITE_ID,x          ; put the new bits into the value. ---HV--- ^ SPRITE_ID & 00011000 ^ SPRITE_ID = SSSHVSSS
             sta   _Sprites+SPRITE_ID,x          ; Keep a copy of the full descriptor
-            jsr   _GetBaseTileAddr              ; This applies the TILE_ID_MASK
-            cmp   _Sprites+TILE_DATA_OFFSET,x
-            beq   :no_tile_change
-            sta   _Sprites+TILE_DATA_OFFSET,x
+            tya
+:sprite_stamp_change
+            sta   _Sprites+VBUFF_ADDR,x          ; Just save this to stay in sync
 
-            jsr   _PrecalcAllSpriteInfo         ; Cache stuff
-            jsr   _DrawSpriteSheet              ; Render the sprite into internal space if the tile id has changed
-
-:no_tile_change
-            lda   _Sprites+SPRITE_STATUS,x
+            lda   _Sprites+SPRITE_STATUS,x      ; Mark this sprite as updated
             ora   #SPRITE_STATUS_UPDATED
             sta   _Sprites+SPRITE_STATUS,x
 
-:no_sprite_change
-            rts
+            jmp   _PrecalcAllSpriteInfo         ; Cache stuff and return
 
 ; Move a sprite to a new location.  If the tile ID of the sprite needs to be changed, then
 ; a full remove/add cycle needs to happen
 ;
-; A = sprite ID
+; A = sprite slot
 ; X = x position
 ; Y = y position
-MoveSprite  ENT
-            phb
-            phk
-            plb
-            jsr    _MoveSprite
-            plb
-            rtl
-
 _MoveSprite
-            phx                                 ; swap X/A to be more efficient
-            tax
-            pla
-
-_MoveSpriteX
-            cpx   #MAX_SPRITES*2                ; Make sure we're in bounds
+            cmp   #MAX_SPRITES
             bcc   :ok
             rts
 
 :ok
-_MoveSpriteXnc
+            phx                                 ; Save X to swap into A
+            asl
+            tax
+            pla
+
             cmp   _Sprites+SPRITE_X,x
             bne   :changed1
-            sta   _Sprites+SPRITE_X,x           ; Update the X coordinate
             tya
             cmp   _Sprites+SPRITE_Y,x
             bne   :changed2
@@ -766,61 +814,8 @@ _MoveSpriteXnc
 :changed2
             sta   _Sprites+SPRITE_Y,x           ; Update the Y coordinate
 
-            jsr   _PrecalcAllSpriteInfo          ; Can be specialized to only update (x,y) values
-
             lda   _Sprites+SPRITE_STATUS,x
             ora   #SPRITE_STATUS_MOVED
             sta   _Sprites+SPRITE_STATUS,x
 
-            rts
-
-; Sprite data structures.  We cache quite a few pieces of information about the sprite
-; to make calculations faster, so this is hidden from the caller.
-;
-;
-; Number of "off-screen" lines above logical (0,0)
-; NUM_BUFF_LINES  equ 24
-
-MAX_SPRITES     equ 16
-SPRITE_REC_SIZE equ 52
-
-; Mark each sprite as ADDED, UPDATED, MOVED, REMOVED depending on the actions applied to it
-; on this frame.  Quick note, the same Sprite ID cannot be removed and added in the same frame.
-; A REMOVED sprite if removed from the sprite list during the Render call, so it's ID is not
-; available to the AddSprite function until the next frame.
-
-SPRITE_STATUS_EMPTY    equ $0000         ; If the status value is zero, this sprite slot is available
-SPRITE_STATUS_OCCUPIED equ $8000         ; Set the MSB to flag it as occupied
-SPRITE_STATUS_ADDED    equ $0001         ; Sprite was just added (new sprite)
-SPRITE_STATUS_MOVED    equ $0002         ; Sprite's position was changed
-SPRITE_STATUS_UPDATED  equ $0004         ; Sprite's non-position attributes were changed
-SPRITE_STATUS_REMOVED  equ $0008         ; Sprite has been removed.
-
-SPRITE_STATUS      equ {MAX_SPRITES*0}
-TILE_DATA_OFFSET   equ {MAX_SPRITES*2}
-VBUFF_ADDR         equ {MAX_SPRITES*4}  ; Fixed address in sprite/mask banks
-SPRITE_ID          equ {MAX_SPRITES*6}
-SPRITE_X           equ {MAX_SPRITES*8}
-SPRITE_Y           equ {MAX_SPRITES*10}
-TILE_STORE_ADDR_1  equ {MAX_SPRITES*12}
-TILE_STORE_ADDR_2  equ {MAX_SPRITES*14}
-TILE_STORE_ADDR_3  equ {MAX_SPRITES*16}
-TILE_STORE_ADDR_4  equ {MAX_SPRITES*18}
-TILE_STORE_ADDR_5  equ {MAX_SPRITES*20}
-TILE_STORE_ADDR_6  equ {MAX_SPRITES*22}
-TILE_STORE_ADDR_7  equ {MAX_SPRITES*24}
-TILE_STORE_ADDR_8  equ {MAX_SPRITES*26}
-TILE_STORE_ADDR_9  equ {MAX_SPRITES*28}
-TILE_STORE_ADDR_10 equ {MAX_SPRITES*30}
-SPRITE_DISP        equ {MAX_SPRITES*32}  ; pre-calculated index for jmp (abs,x) based on sprite size
-SPRITE_CLIP_LEFT   equ {MAX_SPRITES*34}
-SPRITE_CLIP_RIGHT  equ {MAX_SPRITES*36}
-SPRITE_CLIP_TOP    equ {MAX_SPRITES*38}
-SPRITE_CLIP_BOTTOM equ {MAX_SPRITES*40}
-IS_OFF_SCREEN      equ {MAX_SPRITES*42}
-SPRITE_WIDTH       equ {MAX_SPRITES*44}
-SPRITE_HEIGHT      equ {MAX_SPRITES*46}
-SPRITE_CLIP_WIDTH  equ {MAX_SPRITES*48}
-SPRITE_CLIP_HEIGHT equ {MAX_SPRITES*50}
-
-_Sprites       ds  SPRITE_REC_SIZE*MAX_SPRITES
+            jmp   _PrecalcAllSpriteInfo         ; Can be specialized to only update (x,y) values
diff --git a/src/Sprite2.s b/src/Sprite2.s
index 82a6dd6..4d131e0 100644
--- a/src/Sprite2.s
+++ b/src/Sprite2.s
@@ -1,63 +1,20 @@
 ; Scratch space to lay out idealized _MakeDirtySprite
 ;  On input, X register = Sprite Array Index
-;Left     equ   tmp1
-;Right    equ   tmp2
-;Top      equ   tmp3
-;Bottom   equ   tmp4
 
-Origin      equ   tmp4
-TileTop     equ   tmp5
 RowTop      equ   tmp6
 AreaIndex   equ   tmp7
+SpriteBit   equ   tmp8     ; set the bit of the value that if the current sprite index
 
-TileLeft    equ   tmp8
-ColLeft     equ   tmp9
-
-SpriteBit   equ   tmp10     ; set the bit of the value that if the current sprite index
-VBuffOrigin equ   tmp11
-
-; Helper function to take a local pixel coordinate [0, ScreenWidth-1],[0, ScreenHeight-1] and return the
-; row and column in the tile store that is corresponds to.  This takes into consideration the StartX and
-; StartY offsets.
-;
-; This is more specialized than the code in the _MarkDirtySprite routine below since it does not deal with
-; negative or off-screen values.
-_OriginToTileStore
-        lda   StartYMod208
-        lsr
-        lsr
-        and   #$FFFE                             ; Store the pre-multiplied by 2 for indexing
-        tay
-        lda   StartXMod164
-        lsr
-        and   #$FFFE                             ; Same pre-multiply by 2 for later
-        tax
-        rts
-
-; X = local x-coordinate (0, playfield width)
-; Y = local y-coordinate (0, playfield height)
-_LocalToTileStore
-        clc
-        tya
-        adc   StartYMod208                       ; Adjust for the scroll offset
-        cmp   #208                               ; check if we went too far positive
-        bcc   *+5
-        sbc   #208
-        lsr
-        lsr
-        and   #$FFFE                             ; Store the pre-multiplied by 2 for indexing
-        tay
-
-        clc
-        txa
-        adc   StartXMod164
-        cmp   #164
-        bcc   *+5
-        sbc   #164
-        lsr
-        and   #$FFFE                             ; Same pre-multiply by 2 for later
-        tax
-        rts
+; Table of pre-multiplied vbuff strides
+vbuff_mul
+        dw  0*VBUFF_STRIDE_BYTES
+        dw  1*VBUFF_STRIDE_BYTES
+        dw  2*VBUFF_STRIDE_BYTES
+        dw  3*VBUFF_STRIDE_BYTES
+        dw  4*VBUFF_STRIDE_BYTES
+        dw  5*VBUFF_STRIDE_BYTES
+        dw  6*VBUFF_STRIDE_BYTES
+        dw  7*VBUFF_STRIDE_BYTES
 
 ; Marks a sprite as dirty.  The work here is mapping from local screen coordinates to the 
 ; tile store indices.  The first step is to adjust the sprite coordinates based on the current
@@ -80,454 +37,307 @@ _LocalToTileStore
 ; 8        10        2             8
 ; ...
 ;
-; For the Y-coordinate, we just use "mod 8" instead of "mod 4"
-mdsOut  rts
-_MarkDirtySprite
-
-        lda   #0
-        sta   _Sprites+TILE_STORE_ADDR_1,y       ; Clear this sprite's dirty tile list in case of an early exit
-        lda   _SpriteBits,y                      ; Cache its bit flag to mark in the tile slots
-        sta   SpriteBit
+; For the Y-coordinate, we use "mod 8" instead of "mod 4"
+;
+; When this subroutine is completed, the following values will be calculated
+;
+;  _Sprites+TS_COVERAGE_SIZE : The number of horizontal and vertical playfield tiles covered by the sprite
+;  _Sprites+TS_LOOKUP_INDEX  : TileStore index of the upper-left corner of the sprite
+;  _Sprites+TS_VBUFF_BASE    : Address of the top-left corner of the sprite in the VBUFF sprite stamp memory
+;
+; The clipped sprite coordinates are used to calculate the tiles that are visible, but the actual 
+; sprite coordinates (including handling negative values) are used to calculate the VBUFF offset
+; values.
+mdsOut2
+        lda   #6                                 ; Pick a value for a 0x0 tile sprite
+        sta   _Sprites+TS_COVERAGE_SIZE,y         ; zero the list of tile store addresses
+        rts
 
+_CalcDirtySprite
         lda   _Sprites+IS_OFF_SCREEN,y           ; Check if the sprite is visible in the playfield
-        bne   mdsOut
+        bne   mdsOut2
 
-; At this point we know that we have to update the tiles that overlap the sprite's rectangle defined
-; by (Top, Left), (Bottom, Right).  First, calculate the row and column in the TileStore that 
-; encloses the top-left on-screen corner of the sprite
+; Part 1: Calculate the visible tiles that the sprite covers.  If the sprite is partially
+;         off-screen, then the visible tiles may be different than the set of tiles
+;         covered by the sprite.  In particular, the upper-left corner tile which defines
+;         relative offset values will change.
+;
+;         So, we do some calculations with the CLIPPED values and some with the actual
+;         sprite values.  There is an optimization opportunity here to share calculations
+;         when the x or y position of the sprite is positive.
+
+; Add the first visible row of the sprite to the Y-scroll offset to find the first line in the
+; code field that needs to be drawn.  The range of values is 0 to 199+207 = [0, 406]. This
+; value is dividede by 8, so the range of lookup values is [0, 50], so 51 possible values.
 
         clc
         lda   _Sprites+SPRITE_CLIP_TOP,y
         adc   StartYMod208                       ; Adjust for the scroll offset
-        tax                                      ; cache
-        cmp   #208                               ; check if we went too far positive
-        bcc   *+5
-        sbc   #208
+        pha                                      ; Cache
+        and   #$FFF8                             ; mask first to ensure LSR will clear the carry
         lsr
-        lsr                                       ; This is the row in the Tile Store for top-left corner of the sprite
-        and   #$FFFE                              ; Store the value pre-multiplied by 2 for indexing in the :mark_R_C routines
-        sta   RowTop
+        lsr
+        tax
+        lda   TileStoreLookupYTable,x
+        sta   RowTop                             ; Even numbers from [0, 100] (51 elements)
 
-; Next, calculate how many tiles are covered by the sprite.  This uses the table at the top of this function, but
-; the idea is that for every increment of StartX or StartY, that can shift the sprite into the next tile, up to
-; a maximum of mod 4 / mod 8.  So the effective width of a sprite is (((StartX + Clip_Left) mod 4) + Clip_Width) / 4
+; Get the position of the top edge within the tile and then add it to the sprite's height
+; to calculate the number of tiles that are overlapped.  We use the actual width and height
+; values here so small sprites (like 4x4 bullets) only force an update to the actual tiles
+; that are intersected, rather than assuming an 8x8 sprite always takes up that amount of
+; space.
 
-        txa
+        pla
         and   #$0007
-        sta   tmp0                                ; save to adjust sprite origin
-
-        lda   _Sprites+SPRITE_CLIP_HEIGHT,y       ; Nominal value between 0 and 16+7 = 23 = 10111
+        adc   _Sprites+SPRITE_CLIP_HEIGHT,y       ; Nominal value between 0 and 16+7 = 23 = 10111
         dec
-        clc
-        adc   tmp0
         and   #$0018
         sta   AreaIndex
 
-; Repeat to get the same information for the columns
+; Add the horizontal position to the horizontal offset to find the first column in the
+; code field that needs to be drawn.  The range of values is 0 to 159+163 = [0, 322]. 
+; This value is divided by 4, so 81 possible values
 
         clc
         lda   _Sprites+SPRITE_CLIP_LEFT,y
         adc   StartXMod164
-        tax
-        cmp   #164
-        bcc   *+5
-        sbc   #164
-        lsr
-        and   #$FFFE                             ; Same pre-multiply by 2 for later
-        sta   ColLeft
+        pha
+        and   #$FFFC
+        lsr                                       ; Even numbers from [0, 160] (81 elements)
+        adc   RowTop
+        sta   _Sprites+TS_LOOKUP_INDEX,y          ; This is the index into the TileStoreLookup table
 
-        txa
+
+; Calculate the final amount of visible tiles that need to be refreshed and use that to
+; set the coverage size index.
+
+        pla
         and   #$0003
-        sta   tmp1                               ; save to adjust sprite origin
-
-        lda   _Sprites+SPRITE_CLIP_WIDTH,y       ; max width = 8 = 0x08
+        adc   _Sprites+SPRITE_CLIP_WIDTH,y       ; max width = 8 = 0x08
         dec
-        clc
-        adc   tmp1
+        and   #$000C
         lsr                                      ; max value = 4 = 0x04
-        and   #$0006
-        ora   AreaIndex
-        sta   AreaIndex
+        ora   AreaIndex                          ; merge into the area index
+        sta   _Sprites+TS_COVERAGE_SIZE,y        ; Save this value as a key to the coverage size of the sprite
 
-; Calculate the modified origin address for the sprite.  We need to look at the sprite flip bits
-; to determine which of the four sprite stamps is the correct one to use.  Then, offset that origin
-; based on the (x, y) and (startx, starty) positions.
 
-        lda   _Sprites+SPRITE_DISP,y             ; Each stamp is 12 bytes
-        and   #$0006
-        tax
-        lda   :stamp_step,x
+; Part 2: Redo some calculation with the actual (signed) sprite positions that take into
+;         account negative coordinates to set the VBuff offset values.
+
         clc
-        adc   _Sprites+VBUFF_ADDR,y
-        sec
-        sbc   tmp1                               ; Subtract the horizontal within-tile displacement
-        asl   tmp0
-        ldx   tmp0
-        sec
-        sbc   :vbuff_mul,x
-        sta   VBuffOrigin
-        lda   #^TileStore
-        sta   tmp1
+        lda   _Sprites+SPRITE_Y,y
+        adc   StartYMod208
+        bpl   :y_ok
+        clc
+        adc   #208                               ; Wrap the actual coordinat around
+:y_ok   and   #$FFF8                             ; mask first to ensure LSR will clear the carry
+        lsr
+        lsr
+        tax                                      ; Tile store lookup index
 
-; Dispatch to cover the tiles
+        lda   _Sprites+SPRITE_X,y
+        adc   StartXMod164
+        bpl   :x_ok
+        clc
+        adc   #164
+:x_ok   and   #$FFFC
+        lsr                                       ; Even numbers from [0, 160] (81 elements)
+        sta   tmp3
+        adc   TileStoreLookupYTable,x
+        pha                                       ; will be PLX later
 
-        ldx   AreaIndex
-        jmp   (:mark,x)
-:mark   dw    :mark1x1,:mark1x2,:mark1x3,mdsOut
+        clc                                       ; Carry should still be clear here....
+        lda   StartYMod208
+        adc   _Sprites+SPRITE_Y,y
+        bpl   :pos_y
+        clc
+        adc   #208
+:pos_y
+        and   #$0007
+        asl                                       ; Multiply by 48.  Would be nice to use a 
+        asl                                       ; table lookup, but the values can be negative
+        asl                                       ; so do the calculation
+        asl
+        sta   tmp0
+        asl
+        clc
+        adc   tmp0
+        sta   tmp0
+
+; Calculate the final address of the sprite data in the stamp buffer. We have to move earlier 
+; in the buffer based on the horizontal offset and move up for each vertical offset.
+;
+; For a negative value we need to adjust the vbuff by the number of off-screen tiles plus
+; the alignment adjustment.
+
+        clc
+        lda   StartXMod164
+        adc   _Sprites+SPRITE_X,y
+        bpl   :pos_x
+        clc
+        adc   #164
+:pos_x
+        and   #$0003
+        clc
+        adc   tmp0                               ; add to the vertical offset
+
+; Subtract this value from the SPRITE_DISP address
+
+        eor   #$FFFF                             ; A = -X - 1
+        sec                                      ; C = 1
+        adc   _Sprites+SPRITE_DISP,y             ; A = SPRITE_DISP + (-X - 1) + 1 = SPRITE_DISP - X
+        sta   _Sprites+TS_VBUFF_BASE,y
+
+; Create an offset value for loading the calculated VBUFF addresses within the core renderer by
+; subtracting the actual TileStore offset from the sprite's vbuff address array
+;
+; The X-register still has the TileStoreLookupYTable index, which we re-use to get a VBuff
+; array selector for the vertical location
+
+        lda   VBuffVertTableSelect,x              ; A bunch of 0, 12 or 24 values
+        clc
+        ldx   tmp3
+        adc   VBuffHorzTableSelect,x              ; A bunch of 0, 4 or 8 values
+        clc
+        adc   #VBuffArray
+        plx
+;        ldx   _Sprites+TS_LOOKUP_INDEX,y
+        sec
+        sbc   TileStoreLookup,x
+        sta   tmp1                                ; Spill this value to direct page temp space
+
+; Last task. Since we don't need to use the X-register to cache values; load the direct page 2 
+; offset for the SPRITE_VBUFF_PTR and save it
+
+tmp_out
+        tya
+        ora   #$100
+        tax
+        lda   tmp1
+        sta   SPRITE_VBUFF_PTR,x
+
+mdsOut  rts
+
+
+; NOTE: The VBuffArray table is set up so that each sprite's vbuff address is stored in a
+;       parallel structure to the Tile Store.  This allows up to use the same TileStoreLookup
+;       offset to index into the array of 16 sprite VBUFF addresses that are bound to a given tile
+_MarkDirtySpriteTiles
+        lda    _SpriteBits,y
+        sta    SpriteBit
+
+        clc
+        ldx    _Sprites+TS_COVERAGE_SIZE,y
+        jmp    (mdsmark,x)
+
+mdsmark dw    :mark1x1,:mark1x2,:mark1x3,mdsOut
         dw    :mark2x1,:mark2x2,:mark2x3,mdsOut
         dw    :mark3x1,:mark3x2,:mark3x3,mdsOut
         dw    mdsOut,mdsOut,mdsOut,mdsOut
 
-:stamp_step dw  0,12,24,36
-:vbuff_mul  dw  0,52,104,156,208,260,312,364
-; Dispatch to the calculated sizing
+; Pair of macros to make the unrolled loop more concise
+;
+;   1. Load the tile store address from a fixed offset
+;   2. Set the sprite bit from the TS_SPRITE_FLAG location
+;   3. Checks if the tile is dirty and marks it
+;   4. If the tile was dirty, save the tile store address to be added to the DirtyTiles list later
+;   5. Sets the VBUFF address for the current sprite slot
+;
+; The second macro is the same as the first, but the VBUFF calculation is moved up so that the value
+; from the previous step can be reused and save a load every other step.
+TSSetSprite mac
+        ldy   TileStoreLookup+{]1},x
+
+        lda   SpriteBit
+        ora   TileStore+TS_SPRITE_FLAG,y
+        sta   TileStore+TS_SPRITE_FLAG,y
+
+        lda   TileStore+TS_DIRTY,y
+        bne   next
+
+        inc
+        sta   TileStore+TS_DIRTY,y
+
+        tya
+        ldy   DirtyTileCount
+        sta   DirtyTiles,y
+        iny
+        iny
+        sty   DirtyTileCount
+next
+        <<<
+
+ROW     equ TILE_STORE_WIDTH*2                      ; This many bytes to the next row in TileStore coordinates
+COL     equ 2                                       ; This many bytes for each element
 
-; Begin a list of subroutines to cover all of the valid sprite size combinations.  This is all unrolled code,
-; mainly to be able to do an unrolled fill of the TILE_STORE_ADDR_X values.  Thus, it's important that the clipping
-; function does its job properly since it allows us to save a lot of time here.
-;
-; These functions are a trade off of being composable versus fast.  Having to pay for multiple JSR/RTS invocations
-; in the hot sprite path isn't great, but we're at a point of diminishing returns.
-;
-; There *might* be some speed gained by pushing a list of :mark_R_C addressed onto the stack in the clipping routing
-; and dispatching that way, but probably not...
 :mark1x1
-        jsr   :mark_0_0
-        sta   _Sprites+TILE_STORE_ADDR_1,y
-        lda   #0
-        sta   _Sprites+TILE_STORE_ADDR_2,y
+        ldx   _Sprites+TS_LOOKUP_INDEX,y
+        TSSetSprite   0*{TS_LOOKUP_SPAN*2}
         rts
 
-; NOTE: If we rework the _PushDirtyTile to use the Y register instead of the X register, we can
-;       optimize all of these :mark routines as
-;
-; :mark1x1
-;        jsr   :mark_0_0
-;        sty   _Sprites+TILE_STORE_ADDR_1,x
-;        stz   _Sprites+TILE_STORE_ADDR_2,y
-;        rts
-
 :mark1x2
-        jsr   :mark_0_0
-        sta   _Sprites+TILE_STORE_ADDR_1,y
-        jsr   :mark_0_1
-        sta   _Sprites+TILE_STORE_ADDR_2,y
-        lda   #0
-        sta   _Sprites+TILE_STORE_ADDR_3,y
+        ldx   _Sprites+TS_LOOKUP_INDEX,y
+        TSSetSprite  0*{TS_LOOKUP_SPAN*2}+0
+        TSSetSprite  0*{TS_LOOKUP_SPAN*2}+2
         rts
 
 :mark1x3
-        jsr   :mark_0_0
-        sta   _Sprites+TILE_STORE_ADDR_1,y
-        jsr   :mark_0_1
-        sta   _Sprites+TILE_STORE_ADDR_2,y
-        jsr   :mark_0_2
-        sta   _Sprites+TILE_STORE_ADDR_3,y
-        lda   #0
-        sta   _Sprites+TILE_STORE_ADDR_4,y
+        ldx   _Sprites+TS_LOOKUP_INDEX,y
+        TSSetSprite  0*{TS_LOOKUP_SPAN*2}+0
+        TSSetSprite  0*{TS_LOOKUP_SPAN*2}+2
+        TSSetSprite  0*{TS_LOOKUP_SPAN*2}+4
         rts
 
 :mark2x1
-        jsr   :mark_0_0
-        sta   _Sprites+TILE_STORE_ADDR_1,y
-        jsr   :mark_1_0
-        sta   _Sprites+TILE_STORE_ADDR_2,y
-        lda   #0
-        sta   _Sprites+TILE_STORE_ADDR_3,y
+        ldx   _Sprites+TS_LOOKUP_INDEX,y
+        TSSetSprite  0*{TS_LOOKUP_SPAN*2}+0
+        TSSetSprite  1*{TS_LOOKUP_SPAN*2}+0
         rts
 
 :mark2x2
-        jsr   :mark_0_0
-        sta   _Sprites+TILE_STORE_ADDR_1,y
-        jsr   :mark_0_1
-        sta   _Sprites+TILE_STORE_ADDR_2,y
-        jsr   :mark_1_0
-        sta   _Sprites+TILE_STORE_ADDR_3,y
-        jsr   :mark_1_1
-        sta   _Sprites+TILE_STORE_ADDR_4,y
-        lda   #0
-        sta   _Sprites+TILE_STORE_ADDR_5,y
+        ldx   _Sprites+TS_LOOKUP_INDEX,y
+        TSSetSprite  0*{TS_LOOKUP_SPAN*2}+0
+        TSSetSprite  0*{TS_LOOKUP_SPAN*2}+2
+        TSSetSprite  1*{TS_LOOKUP_SPAN*2}+0
+        TSSetSprite  1*{TS_LOOKUP_SPAN*2}+2
         rts
 
 :mark2x3
-        jsr   :mark_0_0
-        sta   _Sprites+TILE_STORE_ADDR_1,y
-        jsr   :mark_0_1
-        sta   _Sprites+TILE_STORE_ADDR_2,y
-        jsr   :mark_0_2
-        sta   _Sprites+TILE_STORE_ADDR_3,y
-        jsr   :mark_1_0
-        sta   _Sprites+TILE_STORE_ADDR_4,y
-        jsr   :mark_1_1
-        sta   _Sprites+TILE_STORE_ADDR_5,y
-        jsr   :mark_1_2
-        sta   _Sprites+TILE_STORE_ADDR_6,y
-        lda   #0
-        sta   _Sprites+TILE_STORE_ADDR_7,y
+        ldx   _Sprites+TS_LOOKUP_INDEX,y
+        TSSetSprite  0*{TS_LOOKUP_SPAN*2}+0
+        TSSetSprite  0*{TS_LOOKUP_SPAN*2}+2
+        TSSetSprite  0*{TS_LOOKUP_SPAN*2}+4
+        TSSetSprite  1*{TS_LOOKUP_SPAN*2}+0
+        TSSetSprite  1*{TS_LOOKUP_SPAN*2}+2
+        TSSetSprite  1*{TS_LOOKUP_SPAN*2}+4
         rts
 
 :mark3x1
-        jsr   :mark_0_0
-        sta   _Sprites+TILE_STORE_ADDR_1,y
-        jsr   :mark_1_0
-        sta   _Sprites+TILE_STORE_ADDR_2,y
-        jsr   :mark_2_0
-        sta   _Sprites+TILE_STORE_ADDR_3,y
-        lda   #0
-        sta   _Sprites+TILE_STORE_ADDR_4,y
+        ldx   _Sprites+TS_LOOKUP_INDEX,y
+        TSSetSprite  0*{TS_LOOKUP_SPAN*2}+0
+        TSSetSprite  1*{TS_LOOKUP_SPAN*2}+0
+        TSSetSprite  2*{TS_LOOKUP_SPAN*2}+0
         rts
 
 :mark3x2
-        jsr   :mark_0_0
-        sta   _Sprites+TILE_STORE_ADDR_1,y
-        jsr   :mark_1_0
-        sta   _Sprites+TILE_STORE_ADDR_2,y
-        jsr   :mark_2_0
-        sta   _Sprites+TILE_STORE_ADDR_3,y
-        jsr   :mark_0_1
-        sta   _Sprites+TILE_STORE_ADDR_4,y
-        jsr   :mark_1_1
-        sta   _Sprites+TILE_STORE_ADDR_5,y
-        jsr   :mark_2_1
-        sta   _Sprites+TILE_STORE_ADDR_6,y
-        lda   #0
-        sta   _Sprites+TILE_STORE_ADDR_7,y
+        ldx   _Sprites+TS_LOOKUP_INDEX,y
+        TSSetSprite  0*{TS_LOOKUP_SPAN*2}+0
+        TSSetSprite  0*{TS_LOOKUP_SPAN*2}+2
+        TSSetSprite  1*{TS_LOOKUP_SPAN*2}+0
+        TSSetSprite  1*{TS_LOOKUP_SPAN*2}+2
+        TSSetSprite  2*{TS_LOOKUP_SPAN*2}+0
+        TSSetSprite  2*{TS_LOOKUP_SPAN*2}+2
         rts
 
 :mark3x3
-        jsr   :mark_0_0
-        sta   _Sprites+TILE_STORE_ADDR_1,y
-        jsr   :mark_1_0
-        sta   _Sprites+TILE_STORE_ADDR_2,y
-        jsr   :mark_2_0
-        sta   _Sprites+TILE_STORE_ADDR_3,y
-        jsr   :mark_0_1
-        sta   _Sprites+TILE_STORE_ADDR_4,y
-        jsr   :mark_1_1
-        sta   _Sprites+TILE_STORE_ADDR_5,y
-        jsr   :mark_2_1
-        sta   _Sprites+TILE_STORE_ADDR_6,y
-        jsr   :mark_0_2
-        sta   _Sprites+TILE_STORE_ADDR_7,y
-        jsr   :mark_1_2
-        sta   _Sprites+TILE_STORE_ADDR_8,y
-        jsr   :mark_2_2
-        sta   _Sprites+TILE_STORE_ADDR_9,y
-        lda   #0
-        sta   _Sprites+TILE_STORE_ADDR_10,y
+        ldx   _Sprites+TS_LOOKUP_INDEX,y
+        TSSetSprite  0*{TS_LOOKUP_SPAN*2}+0
+        TSSetSprite  0*{TS_LOOKUP_SPAN*2}+2
+        TSSetSprite  0*{TS_LOOKUP_SPAN*2}+4
+        TSSetSprite  1*{TS_LOOKUP_SPAN*2}+0
+        TSSetSprite  1*{TS_LOOKUP_SPAN*2}+2
+        TSSetSprite  1*{TS_LOOKUP_SPAN*2}+4
+        TSSetSprite  2*{TS_LOOKUP_SPAN*2}+0
+        TSSetSprite  2*{TS_LOOKUP_SPAN*2}+2
+        TSSetSprite  2*{TS_LOOKUP_SPAN*2}+4
         rts
-
-; Begin List of subroutines to mark each tile offset
-:mark_0_0
-        ldx   RowTop
-        lda   ColLeft
-        clc
-        adc   TileStoreYTable,x                 ; Fixed offset to the next row
-        tax
-
-        ldal  TileStore+TS_VBUFF_ARRAY_ADDR,x
-        sta   tmp0
-
-        lda   VBuffOrigin
-        sta   [tmp0],y
-
-;        lda   VBuffOrigin                      ; This is an interesting case.  The mapping between the tile store
-;        adc   #{0*4}+{0*256}                  ; and the sprite buffers changes as the StartX, StartY values change
-;        stal  TileStore+TS_SPRITE_ADDR,x       ; but don't depend on any sprite information.  However, by setting the
-                                               ; value only for the tiles that get added to the dirty tile list, we
-                                               ; can avoid recalculating over 1,000 values whenever the screen scrolls
-                                               ; (which is common) and just limit it to the number of tiles covered by
-                                               ; the sprites.  If the screen is not scrolling and the sprites are not
-                                               ; moving and they are being dirtied, then we may do more work, but the
-                                               ; odds are in our favor to just take care of it here.
-
-        ; lda   TileStore+TS_SPRITE_FLAG,x
-        lda   SpriteBit
-        oral  TileStore+TS_SPRITE_FLAG,x
-        stal  TileStore+TS_SPRITE_FLAG,x
-
-        jmp   _PushDirtyTileX                   ; Needs X = tile store offset; destroys A,X.  Returns X in A
-
-:mark_1_0
-        lda  ColLeft
-        ldx  RowTop
-        clc
-        adc  TileStoreYTable+2,x
-        tax
-
-        ldal  TileStore+TS_VBUFF_ARRAY_ADDR,x
-        sta   tmp0
-
-        lda   VBuffOrigin
-        adc   #{0*4}+{1*8*SPRITE_PLANE_SPAN}
-        sta   [tmp0],y
-
-        lda   SpriteBit
-        oral  TileStore+TS_SPRITE_FLAG,x
-        stal  TileStore+TS_SPRITE_FLAG,x
-
-        jmp   _PushDirtyTileX
-
-:mark_2_0
-        lda  ColLeft
-        ldx  RowTop
-        clc
-        adc  TileStoreYTable+4,x
-        tax
-
-        ldal  TileStore+TS_VBUFF_ARRAY_ADDR,x
-        sta   tmp0
-
-        lda   VBuffOrigin
-        adc   #{0*4}+{2*8*SPRITE_PLANE_SPAN}
-        sta   [tmp0],y
-
-        lda   SpriteBit
-        oral  TileStore+TS_SPRITE_FLAG,x
-        stal  TileStore+TS_SPRITE_FLAG,x
-
-        jmp   _PushDirtyTileX
-
-:mark_0_1
-        ldx  ColLeft
-        lda  NextCol+2,x
-        ldx  RowTop
-        clc
-        adc  TileStoreYTable,x
-        tax
-
-        ldal  TileStore+TS_VBUFF_ARRAY_ADDR,x
-        sta   tmp0
-
-        lda   VBuffOrigin
-        adc   #{1*4}+{0*8*SPRITE_PLANE_SPAN}
-        sta   [tmp0],y
-
-        lda   SpriteBit
-        oral  TileStore+TS_SPRITE_FLAG,x
-        stal  TileStore+TS_SPRITE_FLAG,x
-
-        jmp   _PushDirtyTileX
-
-:mark_1_1
-        ldx  ColLeft
-        lda  NextCol+2,x
-        ldx  RowTop
-        clc
-        adc  TileStoreYTable+2,x
-        tax
-
-        ldal  TileStore+TS_VBUFF_ARRAY_ADDR,x
-        sta   tmp0
-
-        lda   VBuffOrigin
-        adc   #{1*4}+{1*8*SPRITE_PLANE_SPAN}
-        sta   [tmp0],y
-
-        lda   SpriteBit
-        oral  TileStore+TS_SPRITE_FLAG,x
-        stal  TileStore+TS_SPRITE_FLAG,x
-
-        jmp   _PushDirtyTileX
-
-:mark_2_1
-        ldx  ColLeft
-        lda  NextCol+2,x
-        ldx  RowTop
-        clc
-        adc  TileStoreYTable+4,x
-        tax
-
-        ldal  TileStore+TS_VBUFF_ARRAY_ADDR,x
-        sta   tmp0
-
-        lda   VBuffOrigin
-        adc   #{1*4}+{2*8*SPRITE_PLANE_SPAN}
-        sta   [tmp0],y
-
-        lda   SpriteBit
-        oral  TileStore+TS_SPRITE_FLAG,x
-        stal  TileStore+TS_SPRITE_FLAG,x
-
-        jmp   _PushDirtyTileX
-
-:mark_0_2
-        ldx  ColLeft
-        lda  NextCol+4,x
-        ldx  RowTop
-        clc
-        adc  TileStoreYTable,x
-        tax
-
-        ldal  TileStore+TS_VBUFF_ARRAY_ADDR,x
-        sta   tmp0
-
-        lda   VBuffOrigin
-        adc   #{2*4}+{0*8*SPRITE_PLANE_SPAN}
-        sta   [tmp0],y
-
-        lda   SpriteBit
-        oral  TileStore+TS_SPRITE_FLAG,x
-        stal  TileStore+TS_SPRITE_FLAG,x
-
-        jmp   _PushDirtyTileX
-
-:mark_1_2
-        ldx  ColLeft
-        lda  NextCol+4,x
-        ldx  RowTop
-        clc
-        adc  TileStoreYTable+2,x
-        tax
-
-        ldal  TileStore+TS_VBUFF_ARRAY_ADDR,x
-        sta   tmp0
-
-        lda   VBuffOrigin
-        adc   #{2*4}+{1*8*SPRITE_PLANE_SPAN}
-        sta   [tmp0],y
-
-        lda   SpriteBit
-        oral  TileStore+TS_SPRITE_FLAG,x
-        stal  TileStore+TS_SPRITE_FLAG,x
-
-        jmp   _PushDirtyTileX
-
-:mark_2_2
-        ldx  ColLeft
-        lda  NextCol+4,x
-        ldx  RowTop
-        clc
-        adc  TileStoreYTable+4,x
-        tax
-
-        ldal  TileStore+TS_VBUFF_ARRAY_ADDR,x
-        sta   tmp0
-
-        lda   VBuffOrigin
-        adc   #{2*4}+{2*8*SPRITE_PLANE_SPAN}
-        sta   [tmp0],y
-
-        lda   SpriteBit
-        oral  TileStore+TS_SPRITE_FLAG,x
-        stal  TileStore+TS_SPRITE_FLAG,x
-
-        jmp   _PushDirtyTileX
-
-; End list of subroutines to mark dirty tiles
-
-; Range-check and clamp the vertical part of the sprite.  When this routine returns we will have valid
-; values for the tile-top and row-top.  Also, the accumulator will return the number of rows to render,
-; a value of zero means that all of the sprite's rows are off-screen.
-;
-; This subroutine takes are of calculating the extra tile for unaligned accesses, too.
-;_SpriteHeight       dw 8,8,16,16
-;_SpriteHeightMinus1 dw 7,7,15,15
-;_SpriteRows         dw 1,1,2,2
-;_SpriteWidth        dw 4,8,4,8
-;_SpriteWidthMinus1  dw 3,7,3,7
-;_SpriteCols         dw 1,2,1,2
-
-; Convert sprite index to a bit position
-_SpriteBits         dw $0001,$0002,$0004,$0008,$0010,$0020,$0040,$0080,$0100,$0200,$0400,$0800,$1000,$2000,$4000,$8000
-_SpriteBitsNot      dw $FFFE,$FFFD,$FFFB,$FFF7,$FFEF,$FFDF,$FFBF,$FF7F,$FEFF,$FDFF,$FBFF,$F7FF,$EFFF,$DFFF,$BFFF,$7FFF
diff --git a/src/SpriteRender.s b/src/SpriteRender.s
index 39041fd..71d5ced 100644
--- a/src/SpriteRender.s
+++ b/src/SpriteRender.s
@@ -1,28 +1,27 @@
-; Function to render a sprite from a sprite definition into the internal data buffers
+; Alternate entry point that takes arguments in registers instead of using a _Sprite
+; record
 ;
-; X = sprite index
-_DrawSpriteSheet
+; Y = VBUFF address
+; X = Tile Data address
+; A = Sprite Flags
 DISP_VFLIP   equ    $0004      ; hard code these because they are internal values
 DISP_HFLIP   equ    $0002
-DISP_MASK    equ    $0018      ; Isolate the size bits
+DISP_MASK    equ    $0018      ; Preserve the size bits
 
-             phx
-
-             lda    _Sprites+VBUFF_ADDR,x
-             sta    tmp1
-
-             lda    _Sprites+TILE_DATA_OFFSET,x
-             sta    tmp2
-
-             lda    _Sprites+SPRITE_DISP,x
+_DrawSpriteStamp
+             sty    tmp1
+             stx    tmp2
+             xba
              and    #DISP_MASK                    ; dispatch to all of the different orientations
              sta    tmp3
 
-; Set bank
              phb
              pea   #^tiledata                     ; Set the bank to the tile data
              plb
 
+; X = sprite ID
+; Y = Tile Data
+; A = VBUFF address
              ldx    tmp3
              ldy    tmp2
              lda    tmp1
@@ -34,7 +33,7 @@ DISP_MASK    equ    $0018      ; Isolate the size bits
              ldy    tmp2
              lda    tmp1
              clc
-             adc    #4*3
+             adc    #3*4
              jsr    _DrawSprite
 
              lda    tmp3
@@ -43,7 +42,7 @@ DISP_MASK    equ    $0018      ; Isolate the size bits
              ldy    tmp2
              lda    tmp1
              clc
-             adc    #4*6
+             adc    #6*4
              jsr    _DrawSprite
 
              lda    tmp3
@@ -52,19 +51,16 @@ DISP_MASK    equ    $0018      ; Isolate the size bits
              ldy    tmp2
              lda    tmp1
              clc
-             adc    #4*9
+             adc    #9*4
              jsr    _DrawSprite
 
 ; Restore bank
              plb                                  ; pop extra byte
              plb
-
-             plx
              rts
 ; 
 ; X = _Sprites array offset
 _DrawSprite
-;             ldx   _Sprites+SPRITE_DISP,y        ; use bits 9, 10, 11, 12 and 13 to dispatch
              jmp   (draw_sprite,x)
 
 draw_sprite  dw    draw_8x8,draw_8x8h,draw_8x8v,draw_8x8hv
@@ -166,6 +162,9 @@ draw_16x8hv
              ply
              jmp   _DrawTile8x8V
 
+; X = sprite ID
+; Y = Tile Data
+; A = VBUFF address
 draw_16x16
              clc
              tax
@@ -262,7 +261,7 @@ draw_16x16hv
              tax
              tya
              pha
-             adc   #128+{128*32}                        ; Bottom-right source to top-left 
+             adc   #{128*{32+1}}+64                        ; Bottom-right source to top-left 
              tay
              jsr   _DrawTile8x8V
 
@@ -270,7 +269,7 @@ draw_16x16hv
              adc   #4
              tax
              lda   1,s
-             adc   #{128*32}
+             adc   #{128*32}+64
              tay
              jsr   _DrawTile8x8V
 
@@ -278,14 +277,16 @@ draw_16x16hv
              adc   #{8*SPRITE_PLANE_SPAN}-4
              tax
              lda    1,s
-             adc    #128
+             adc    #128+64
              tay
              jsr   _DrawTile8x8V
 
              txa
              adc   #4
              tax
-             ply
+             pla
+             adc   #64
+             tay
              jmp   _DrawTile8x8V
 
 
diff --git a/src/SpriteV1.s b/src/SpriteV1.s
new file mode 100644
index 0000000..6d24dbb
--- /dev/null
+++ b/src/SpriteV1.s
@@ -0,0 +1,226 @@
+; Old code the was in Version 1, but is not needed.  May be adapted for Verions 2.
+
+; Y = _Sprites array offset
+_EraseSpriteY
+             lda   _Sprites+OLD_VBUFF_ADDR,y
+             beq   :noerase
+             ldx   _Sprites+SPRITE_DISP,y              ; get the dispatch index for this sprite (32 values)
+             jmp   (:do_erase,x)
+:noerase     rts
+:do_erase    dw    _EraseTileSprite8x8,_EraseTileSprite8x8,_EraseTileSprite8x8,_EraseTileSprite8x8
+             dw    _EraseTileSprite8x16,_EraseTileSprite8x16,_EraseTileSprite8x16,_EraseTileSprite8x16
+             dw    _EraseTileSprite16x8,_EraseTileSprite16x8,_EraseTileSprite16x8,_EraseTileSprite16x8
+             dw    _EraseTileSprite16x16,_EraseTileSprite16x16,_EraseTileSprite16x16,_EraseTileSprite16x16
+             dw    _EraseTileSprite8x8,_EraseTileSprite8x8,_EraseTileSprite8x8,_EraseTileSprite8x8
+             dw    _EraseTileSprite8x16,_EraseTileSprite8x16,_EraseTileSprite8x16,_EraseTileSprite8x16
+             dw    _EraseTileSprite16x8,_EraseTileSprite16x8,_EraseTileSprite16x8,_EraseTileSprite16x8
+             dw    _EraseTileSprite16x16,_EraseTileSprite16x16,_EraseTileSprite16x16,_EraseTileSprite16x16
+
+; A = bank address
+_EraseTileSprite8x8
+            tax
+            phb                                   ; Save the bank to switch to the sprite plane
+
+            pei    SpriteBanks
+            plb                                   ; pop the data bank (low byte)
+
+]line       equ    0
+            lup    8
+            stz:   {]line*SPRITE_PLANE_SPAN}+0,x
+            stz:   {]line*SPRITE_PLANE_SPAN}+2,x
+]line       equ   ]line+1
+            --^
+
+            plb                                  ; pop the mask bank (high byte)
+            lda    #$FFFF
+]line       equ    0
+            lup    8
+            sta:   {]line*SPRITE_PLANE_SPAN}+0,x
+            sta:   {]line*SPRITE_PLANE_SPAN}+2,x
+]line       equ   ]line+1
+            --^
+
+            plb
+            rts
+
+_EraseTileSprite8x16
+            tax
+            phb                                   ; Save the bank to switch to the sprite plane
+
+            pei    SpriteBanks
+            plb                                   ; pop the data bank (low byte)
+
+]line       equ    0
+            lup    16
+            stz:   {]line*SPRITE_PLANE_SPAN}+0,x
+            stz:   {]line*SPRITE_PLANE_SPAN}+2,x
+]line       equ   ]line+1
+            --^
+
+            plb                                  ; pop the mask bank (high byte)
+            lda    #$FFFF
+]line       equ    0
+            lup    16
+            sta:   {]line*SPRITE_PLANE_SPAN}+0,x
+            sta:   {]line*SPRITE_PLANE_SPAN}+2,x
+]line       equ   ]line+1
+            --^
+
+            plb
+            rts
+
+_EraseTileSprite16x8
+            tax
+            phb                                   ; Save the bank to switch to the sprite plane
+
+            pei    SpriteBanks
+            plb                                   ; pop the data bank (low byte)
+
+]line       equ    0
+            lup    8
+            stz:   {]line*SPRITE_PLANE_SPAN}+0,x
+            stz:   {]line*SPRITE_PLANE_SPAN}+2,x
+            stz:   {]line*SPRITE_PLANE_SPAN}+4,x
+            stz:   {]line*SPRITE_PLANE_SPAN}+6,x
+]line       equ   ]line+1
+            --^
+
+            plb                                  ; pop the mask bank (high byte)
+            lda    #$FFFF
+]line       equ    0
+            lup    8
+            sta:   {]line*SPRITE_PLANE_SPAN}+0,x
+            sta:   {]line*SPRITE_PLANE_SPAN}+2,x
+            sta:   {]line*SPRITE_PLANE_SPAN}+4,x
+            sta:   {]line*SPRITE_PLANE_SPAN}+6,x
+]line       equ   ]line+1
+            --^
+
+            plb
+            rts
+
+_EraseTileSprite16x16
+            tax
+            phb                                   ; Save the bank to switch to the sprite plane
+
+            pei    SpriteBanks
+            plb                                   ; pop the data bank (low byte)
+
+]line       equ    0
+            lup    16
+            stz:   {]line*SPRITE_PLANE_SPAN}+0,x
+            stz:   {]line*SPRITE_PLANE_SPAN}+2,x
+            stz:   {]line*SPRITE_PLANE_SPAN}+4,x
+            stz:   {]line*SPRITE_PLANE_SPAN}+6,x
+]line       equ   ]line+1
+            --^
+
+            plb                                  ; pop the mask bank (high byte)
+
+            lda    #$FFFF
+]line       equ    0
+            lup    16
+            sta:   {]line*SPRITE_PLANE_SPAN}+0,x
+            sta:   {]line*SPRITE_PLANE_SPAN}+2,x
+            sta:   {]line*SPRITE_PLANE_SPAN}+4,x
+            sta:   {]line*SPRITE_PLANE_SPAN}+6,x
+]line       equ   ]line+1
+            --^
+
+            plb
+            rts
+
+            
+; First, if there is only one sprite, then we can skip any overhead and do a single lda/and/ora/sta to put the
+; sprite data on the screen.
+;
+; Second, if there are 4 or less, then we "stack" the sprite data using an unrolled loop that allows each
+; sprite to just be a single and/ora pair and the final result is not written to any intermediate memory buffer.
+;
+; Third, if there are 5 or more sprites, then we assume that the sprites are "dense" and that there will be a
+; non-trivial amount of overdraw.  In this case we do a series of optimized copies of the sprite data *and*
+; masks into a direct page buffer in *reverse order*.  Once a mask value becomes zero, then nothing else can
+; show through and that value can be skipped.  Once all of the mask values are zero, then the render is terminated
+; and the data buffer copied to the final destination.
+;
+; Note that these rendering algorithms impose a priority ordering on the sprites where lower sprite IDs are drawn
+; underneath higher sprite IDs.
+RenderActiveSpriteTiles
+                 cmp   #0       ; Is there only one active sprite? If so optimise
+                 bne   :many
+
+                 ldx   vbuff    ; load the address to the (adjusted) sprite tile
+                 lda   TileStore+TS_SCREEN_ADDR,y
+                 tay
+
+                 lda   tiledata+0,y
+                 andl  spritemask,x
+                 oral  spritedata,x
+                 sta   00,s
+
+                 lda   tiledata+2,y
+                 andl  spritemask+2,x
+                 oral  spritedata+2,x
+                 sta   02,s
+
+                 ...
+                 tsc
+                 adc   #320
+                 tcs
+                 ...
+
+                 lda   tiledata+{line*4},y
+                 andl  spritemask+{line*SPAN},x
+                 oral  spritedata+{line*SPAN},x
+                 sta   160,s
+
+                 lda   tiledata+{line*4}+2,y
+                 andl  spritemask+{line*SPAN}+2,x
+                 oral  spritedata+{line*SPAN}+2,x
+                 sta   162,s
+
+                 rts
+
+
+:many
+                 lda   TileStore+TS_SCREEN_ADDR,y
+                 tcs
+                 lda   TileStore+TS_TILE_ADDR,y
+                 tay
+
+                 ldx   count
+                 jmp   (:arr,x)
+                 lda   tiledata+0,y
+                 ldx   vbuff
+                 andl  spritemask,x
+                 oral  spritedata,x
+                 ldx   vbuff+2
+                 andl  spritemask,x
+                 oral  spritedata,x
+                 ldx   vbuff+4
+                 andl  spritemask,x
+                 oral  spritedata,x
+                 ...
+                 sta   00,s
+
+                 ldx   count
+                 jmp   (:arr,x)
+                 lda   tiledata+0,y
+                 ldx   vbuff
+                 andl  spritemask,x
+                 oral  spritedata,x
+                 ldx   vbuff+2
+                 andl  spritemask,x
+                 oral  spritedata,x
+                 ldx   vbuff+4
+                 andl  spritemask,x
+                 oral  spritedata,x
+                 ...
+                 sta   02,s
+
+                 sta   160,s
+
+                 sta   162,s
+
+                 tsc
+                 adc   #320
\ No newline at end of file
diff --git a/src/TileMap.s b/src/TileMap.s
index c6e0326..9fa1b5c 100644
--- a/src/TileMap.s
+++ b/src/TileMap.s
@@ -10,12 +10,6 @@
 ; in actual games since the primary background is often large empty areas, or runs
 ; of repeating tiles.
 
-; Debug locations
-LastTop            ds    2
-LastBottom         ds    2
-LastLeft           ds    2
-LastRight          ds    2
-
 ; The ranges are [:Left, :Right] and [:Top, :Bottom], so :Right can be, at most, 40
 ; if we are drawing all 41 tiles (Index 0 through 40).  The :Bottom value can be
 ; at most 25.
@@ -222,17 +216,6 @@ _UpdateBG0TileMap
 :NoXUpdate
                    rts
 
-;:Debug
-;                   lda   :Top                    ; Debugging
-;                   sta   LastTop
-;                   lda   :Bottom
-;                   sta   LastBottom
-;                   lda   :Left
-;                   sta   LastLeft
-;                   lda   :Right
-;                   sta   LastRight
-;                   rts
-
 ; This is a private subroutine that draws in tiles into the code fields using the
 ; data from the tilemap and the local :Top, :Left, :Bottom and :Right parameters.
 :DrawRectBG0
@@ -639,7 +622,7 @@ _DrawRectBG1
 
                    ldx   :BlkX
                    ldy   :BlkY
-                   jsr   _CopyBG1Tile
+;                   jsr   _CopyBG1Tile
 
                    lda   :BlkX
                    inc
@@ -676,4 +659,3 @@ _DrawRectBG1
                    pla
 
                    rts
-
diff --git a/src/Tiles.s b/src/Tiles.s
new file mode 100644
index 0000000..ad55581
--- /dev/null
+++ b/src/Tiles.s
@@ -0,0 +1,628 @@
+; Basic tile functions
+
+; Copy tileset data from a pointer in memory to the tiledata back
+; X = high word
+; A = low word
+_LoadTileSet
+                sta  tmp0
+                stx  tmp1
+                ldy  #0
+                tyx
+:loop           lda  [tmp0],y
+                stal tiledata,x
+                dex
+                dex
+                dey
+                dey
+                bne  :loop
+                rts
+
+
+; Low-level function to take a tile descriptor and return the address in the tiledata
+; bank.  This is not too useful in the fast-path because the fast-path does more
+; incremental calculations, but it is handy for other utility functions
+;
+; A = tile descriptor
+;
+; The address is the TileID * 128 + (HFLIP * 64)
+_GetTileAddr
+                 asl                                               ; Multiply by 2
+                 bit   #2*TILE_HFLIP_BIT                           ; Check if the horizontal flip bit is set
+                 beq   :no_flip
+                 inc                                               ; Set the LSB
+:no_flip         asl                                               ; x4
+                 asl                                               ; x8
+                 asl                                               ; x16
+                 asl                                               ; x32
+                 asl                                               ; x64
+                 asl                                               ; x128
+                 rts
+
+; Ignore the horizontal flip bit
+_GetBaseTileAddr
+                 asl                                               ; Multiply by 2
+                 asl                                               ; x4
+                 asl                                               ; x8
+                 asl                                               ; x16
+                 asl                                               ; x32
+                 asl                                               ; x64
+                 asl                                               ; x128
+                 rts
+
+
+; Helper function to get the address offset into the tile cachce / tile backing store
+; X = tile column [0, 40] (41 columns)
+; Y = tile row    [0, 25] (26 rows)
+_GetTileStoreOffset
+                 phx                        ; preserve the registers
+                 phy
+
+                 jsr  _GetTileStoreOffset0
+
+                 ply
+                 plx
+                 rts
+
+_GetTileStoreOffset0
+                 tya
+                 asl
+                 tay
+                 txa
+                 asl
+                 clc
+                 adc  TileStoreYTable,y
+                 rts
+
+; Initialize the tile storage data structures.  This takes care of populating the tile records with the
+; appropriate constant values.
+InitTiles
+:col             equ  tmp0
+:row             equ  tmp1
+:vbuff           equ  tmp2
+:base            equ  tmp3
+
+; Initialize the Tile Store
+
+                 ldx  #TILE_STORE_SIZE-2
+                 lda  #25
+                 sta  :row
+                 lda  #40
+                 sta  :col
+                 lda  #$8000
+                 sta  :vbuff
+
+:loop 
+
+; The first set of values in the Tile Store that are changed during each frame based on the actions
+; that are happening
+
+                 lda  #0
+                 sta  TileStore+TS_TILE_ID,x            ; clear the tile store with the special zero tile
+                 sta  TileStore+TS_TILE_ADDR,x
+                 sta  TileStore+TS_SPRITE_FLAG,x        ; no sprites are set at the beginning
+                 sta  TileStore+TS_DIRTY,x              ; none of the tiles are dirty
+
+; Set the default tile rendering functions
+
+                 lda  EngineMode
+                 bit  #ENGINE_MODE_DYN_TILES+ENGINE_MODE_TWO_LAYER
+                 beq  :fast
+                 bit  #ENGINE_MODE_TWO_LAYER
+                 beq  :dyn
+;                 ldal TileProcs
+;                 sta  TileStore+TS_BASE_TILE_DISP,x
+                 bra  :out
+:fast
+                 lda  #0                                 ; Initialize with Tile 0
+                 ldy  #FastProcs
+                 jsr  _SetTileProcs
+                 bra  :out
+
+:dyn             lda  #0                                 ; Initialize with Tile 0
+                 ldy  #FastProcs
+                 jsr  _SetTileProcs
+
+:out
+
+;                 lda  DirtyTileProcs                    ; Fill in with the first dispatch address
+;                 stal TileStore+TS_DIRTY_TILE_DISP,x
+;
+;                 lda  TileProcs                         ; Same for non-dirty, non-sprite base case
+;                 stal TileStore+TS_BASE_TILE_DISP,x     
+
+
+; The next set of values are constants that are simply used as cached parameters to avoid needing to
+; calculate any of these values during tile rendering
+
+                 lda  :row                              ; Set the long address of where this tile
+                 asl                                    ; exists in the code fields
+                 tay
+                 lda  #>TileStore                       ; get middle 16 bits: "00 -->BBHH<-- LL"
+                 and  #$FF00                            ; merge with code field bank
+                 ora  BRowTableHigh,y
+                 sta  TileStore+TS_CODE_ADDR_HIGH,x     ; High word of the tile address (just the bank)
+
+                 lda  BRowTableLow,y
+                 sta  :base
+;                 sta  TileStore+TS_BASE_ADDR,x          ; May not be needed later if we can figure out the right constant...
+
+                 lda  :col                              ; Set the offset values based on the column
+                 asl                                    ; of this tile
+                 asl
+                 sta  TileStore+TS_WORD_OFFSET,x        ; This is the offset from 0 to 82, used in LDA (dp),y instruction
+
+                 tay
+                 lda  Col2CodeOffset+2,y
+                 clc
+                 adc  :base
+;                 adc  TileStore+TS_BASE_ADDR,x
+                 sta  TileStore+TS_CODE_ADDR_LOW,x      ; Low word of the tile address in the code field
+
+                 lda  JTableOffset,y
+                 clc
+                 adc  :base
+                 sta  TileStore+TS_JMP_ADDR,x           ; Address of the snippet handler for this tile
+
+                 dec  :col
+                 bpl  :hop
+                 dec  :row
+                 lda  #40
+                 sta  :col
+:hop
+
+                 dex
+                 dex
+                 bpl  :loop
+                 rts
+
+; Set a tile value in the tile backing store.  Mark dirty if the value changes
+;
+; A = tile id
+; X = tile column [0, 40] (41 columns)
+; Y = tile row    [0, 25] (26 rows)
+;
+; Registers are not preserved
+oldTileId  equ  blttmp                              ; This location is used in _SetTileProcs, too
+newTileId  equ  blttmp+2
+procIdx    equ  blttmp+4
+
+_SetTile
+                 sta  newTileId
+                 jsr  _GetTileStoreOffset0          ; Get the address of the X,Y tile position
+                 tax
+
+                 lda  TileStore+TS_TILE_ID,x
+                 cmp  newTileId
+                 bne  :changed
+                 rts
+
+:changed         sta  oldTileId
+                 lda  newTileId
+                 sta  TileStore+TS_TILE_ID,x        ; Value is different, store it.
+                 jsr  _GetTileAddr
+                 sta  TileStore+TS_TILE_ADDR,x      ; Committed to drawing this tile, so get the address of the tile in the tiledata bank for later
+
+; Set the renderer procs for this tile.
+;
+; NOTE: Later on, optimize this to just take the Tile ID & TILE_CTRL_MASK and lookup the right proc
+;       table address from a lookup table....
+;
+;  1. The dirty render proc is always set the same.
+;  2. If BG1 and DYN_TILES are disabled, then the TS_BASE_TILE_DISP is selected from the Fast Renderers, otherwise
+;     it is selected from the full tile rendering functions.
+;  3. The copy process is selected based on the flip bits
+;
+; When a tile overlaps the sprite, it is the responsibility of the Render function to compose the appropriate
+; functionality.  Sometimes it is simple, but in cases of the sprites overlapping Dynamic Tiles and other cases
+; it can be more involved.
+
+; Calculate the base tile proc selector from the tile Id
+                 stz  procIdx
+
+                 lda  #TILE_PRIORITY_BIT
+                 bit  newTileId
+                 beq  :low_priority
+                 lda  #4
+                 sta  procIdx
+:low_priority
+                 lda  #TILE_ID_MASK
+                 bit  newTileId
+                 beq  :is_zero
+                 lda  #2
+                 tsb  procIdx
+:is_zero
+
+                 lda  #TILE_VFLIP_BIT
+                 bit  newTileId
+                 beq  :no_vflip
+                 lda  #1
+                 tsb  procIdx
+:no_vflip
+
+; Now integrate with the engine mode indicator
+
+                 lda  EngineMode
+                 bit  #ENGINE_MODE_DYN_TILES+ENGINE_MODE_TWO_LAYER
+                 beq  :setTileFast
+
+                 bit  #ENGINE_MODE_TWO_LAYER
+                 bne  :not_dyn
+                 brl  :setTileDyn
+
+:not_dyn
+                 lda  #TILE_DYN_BIT
+                 bit  newTileId
+                 beq  :pickTwoLyrProc
+
+                 ldy  #TwoLyrDynProcs
+                 brl  :pickDynProc
+
+:pickTwoLyrProc  ldy  #TwoLyrProcs
+                 lda  procIdx
+                 jsr  _SetTileProcs
+                 jmp  _PushDirtyTileX
+
+; Specialized check for when the engine is in "Fast" mode. If is a simple decision tree based on whether
+; the tile priority bit is set, and whether this is the special tile 0 or not.
+:setTileFast
+                 ldy  #FastProcs
+                 lda  procIdx
+                 jsr  _SetTileProcs
+                 jmp  _PushDirtyTileX
+
+; Specialized check for when the engine has enabled dynamic tiles. In this case we are no longer
+; guaranteed that the opcodes in a tile are PEA instructions.  
+:setTileDyn
+                 lda  #TILE_DYN_BIT
+                 bit  newTileId
+                 beq  :pickSlowProc            ; If the Dynamic bit is not set, select a tile proc that sets opcodes
+
+                 ldy  #DynProcs                ; use this table
+:pickDynProc
+                 lda  newTileId                ; Otherwise chose one of the two dynamic tuples
+                 and  #TILE_PRIORITY_BIT
+                 beq  *+5                     ; If the Priority bit is not set, pick the first entry
+                 lda  #1                      ; If the Priority bit is set, pick the other one
+                 jsr  _SetTileProcs
+                 jmp  _PushDirtyTileX
+
+:pickSlowProc    ldy  #SlowProcs
+                 lda  procIdx
+                 jsr  _SetTileProcs
+                 jmp  _PushDirtyTileX
+
+; X = Tile Store offset
+; Y = Engine Mode Base Table address
+; A = Table proc index
+;
+; see TileProcTables in static/TileStore.s
+tblPtr  equ  blttmp
+_SetTileProcs
+
+; Multiple the proc index by 6 to get the correct table entry offset
+
+                 asl
+                 sta  tblPtr
+                 asl
+                 adc  tblPtr
+                 sta  tblPtr
+
+; Add this offset to the base table address
+
+                 tya
+                 adc  tblPtr
+                 sta  tblPtr
+
+; Set the pointer to this bank
+
+                 phk
+                 phk
+                 pla
+                 and  #$00FF
+                 sta  tblPtr+2
+
+; Lookup the tile procedures
+
+                 ldy  #0
+                 lda  [tblPtr],y
+                 stal K_TS_BASE_TILE_DISP,x
+
+                 ldy  #2
+                 lda  [tblPtr],y
+                 stal K_TS_SPRITE_TILE_DISP,x
+
+                 ldy  #4
+                 lda  [tblPtr],y
+                 stal K_TS_ONE_SPRITE,x
+                 rts
+
+; TileProcTables
+;
+; Tables of tuples used to populate the K_TS_* dispatch arrays for different combinations. This is
+; easier to maintain than a bunch of conditional code.  Each etry hold three addresses.
+;
+; First address:  Draw a tile directly into the code buffer (no sprites)
+; Second address: Draw a tile merged with sprite data from the direct page
+; Third address:  Specialize routine to draw a tile merged with one sprite
+;
+; There are unique tuples of routines for all of the different combinations of tile properties
+; and engine modes.  This is an extesive number of combinations, but it simplified the development
+; and maintainence of the rendering subroutines.  Also, the difference subroutines can be written
+; in any way and can make use of their on subroutines to reduce code size.
+;
+; Properties:
+;
+;  [MODE]         ENGINE_MODE: Fast, Dyn, TwoLayer
+;  [Z | N]        Is Tile 0? : Yes, No
+;  [A | V]        Is VFLIP?  : Yes, No
+;  [Over | Under] Priority?  : Yes, No
+;
+; So eight tuples per engine mode; 24 tuples total.  Table name convention
+;
+; <MODE><Over|Under><Z|N><A|V>
+FastProcs
+FastOverZA   dw   ConstTile0Fast,SpriteOver0Fast,OneSpriteFastOver0
+FastOverZV   dw   ConstTile0Fast,SpriteOver0Fast,OneSpriteFastOver0
+FastOverNA   dw   CopyTileAFast,SpriteOverAFast,OneSpriteFastOverA
+FastOverNV   dw   CopyTileVFast,SpriteOverVFast,OneSpriteFastOverV
+FastUnderZA  dw   ConstTile0Fast,SpriteUnder0Fast,SpriteUnder0Fast
+FastUnderZV  dw   ConstTile0Fast,SpriteUnder0Fast,SpriteUnder0Fast
+FastUnderNA  dw   CopyTileAFast,SpriteUnderAFast,OneSpriteFastUnderA
+FastUnderNV  dw   CopyTileVFast,SpriteUnderVFast,OneSpriteFastUnderV
+
+; "Slow" procs.  These are duplicates of the "Fast" functions, but also
+; set the PEA opcode in all cases.
+SlowProcs
+SlowOverZA   dw   ConstTile0Slow,SpriteOver0Slow,OneSpriteSlowOver0
+SlowOverZV   dw   ConstTile0Slow,SpriteOver0Slow,OneSpriteSlowOver0
+SlowOverNA   dw   CopyTileASlow,SpriteOverASlow,OneSpriteSlowOverA
+SlowOverNV   dw   CopyTileVSlow,SpriteOverVSlow,OneSpriteSlowOverV
+SlowUnderZA  dw   ConstTile0Slow,SpriteUnder0Slow,SpriteUnder0Slow
+SlowUnderZV  dw   ConstTile0Slow,SpriteUnder0Slow,SpriteUnder0Slow
+SlowUnderNA  dw   CopyTileASlow,SpriteUnderASlow,OneSpriteSlowUnderA
+SlowUnderNV  dw   CopyTileVSlow,SpriteUnderVSlow,OneSpriteSlowUnderV
+
+; "Dynamic" procs. These are the specialized routines for a dynamic tiles
+; that does not need to worry about a second background.  Because dynamic
+; tiles don't support horizontal or vertical flipping, there are only two 
+; sets of procedures: one for Over and one for Under.
+DynProcs
+DynOver      dw   CopyDynamicTile,DynamicOver,OneSpriteDynamicOver
+DynUnder     dw   CopyDynamicTile,DynamicUnder,OneSpriteDynamicUnder
+
+; "Two Layer" procs. These are the most complex procs.  Generally,
+; all of these methods are implemented by building up the data
+; and mask into the direct page space and then calling a common
+; function to create the complex code fragments in the code field.
+; There is not a lot of opportuinity to optimize these routines.
+;
+; To improve the performance when two-layer rendering is enabled,
+; the TILE_SOLID_BIT hint bit can be set to indicate that a tile
+; has no transparency.  This allows one of the faster routines
+; to be selected from the other Proc tables
+TwoLyrProcs
+TwoLyrOverZA   dw   Tile0TwoLyr,SpriteOver0TwoLyr,OneSpriteOver0TwoLyr
+TwoLyrOverZV   dw   Tile0TwoLyr,SpriteOver0TwoLyr,OneSpriteOver0TwoLyr
+TwoLyrOverNA   dw   CopyTileATwoLyr,SpriteOverATwoLyr,OneSpriteTwoLyrOverA
+TwoLyrOverNV   dw   CopyTileVTwoLyr,SpriteOverVTwoLyr,OneSpriteTwoLyrOverV
+TwoLyrUnderZA  dw   Tile0TwoLyr,SpriteOver0TwoLyr,OneSpriteOver0TwoLyr   ; if sprites are over or under the transparent tile, same rendering code
+TwoLyrUnderZV  dw   Tile0TwoLyr,SpriteOver0TwoLyr,OneSpriteOver0TwoLyr
+TwoLyrUnderNA  dw   CopyTileATwoLyr,SpriteUnderATwoLyr,OneSpriteTwoLyrUnderA
+TwoLyrUnderNV  dw   CopyTileVTwoLyr,SpriteUnderVTwoLyr,OneSpriteTwoLyrUnderV
+
+; "Dynamic" procs that can handle the second background.
+TwoLyrDynProcs
+TwoLyrDynOver  dw   CopyDynamicTileTwoLyr,DynamicOverTwoLyr,OneSpriteDynamicOverTwoLyr
+TwoLyrDynUnder dw   CopyDynamicTileTwoLyr,DynamicUnderTwoLyr,OneSpriteDynamicUnderTwoLyr
+
+; SetBG0XPos
+;
+; Set the virtual horizontal position of the primary background layer.  In addition to 
+; updating the direct page state locations, this routine needs to preserve the original
+; value as well.  This is a bit subtle, because if this routine is called multiple times
+; with different values, we need to make sure the *original* value is preserved and not
+; continuously overwrite it.
+;
+; We assume that there is a clean code field in this routine
+_SetBG0XPos
+                    cmp   StartX
+                    beq   :out                       ; Easy, if nothing changed, then nothing changes
+
+                    ldx   StartX                     ; Load the old value (but don't save it yet)
+                    sta   StartX                     ; Save the new position
+
+                    lda   #DIRTY_BIT_BG0_X
+                    tsb   DirtyBits                  ; Check if the value is already dirty, if so exit
+                    bne   :out                       ; without overwriting the original value
+
+                    stx   OldStartX                  ; First change, so preserve the value
+:out                rts
+
+
+; SetBG0YPos
+;
+; Set the virtual position of the primary background layer.
+_SetBG0YPos
+                     cmp   StartY
+                     beq   :out                 ; Easy, if nothing changed, then nothing changes
+
+                     ldx   StartY               ; Load the old value (but don't save it yet)
+                     sta   StartY               ; Save the new position
+
+                     lda   #DIRTY_BIT_BG0_Y
+                     tsb   DirtyBits            ; Check if the value is already dirty, if so exit
+                     bne   :out                 ; without overwriting the original value
+
+                     stx   OldStartY            ; First change, so preserve the value
+:out                 rts
+
+; Macro helper for the bit test tree
+;           dobit   bit_position,dest;next;exit
+dobit       mac
+            lsr
+            bcc   next_bit
+            beq   last_bit
+            tax
+            lda   (SPRITE_VBUFF_PTR+{]1*2}),y
+            clc
+            adc   _Sprites+TS_VBUFF_BASE+{]1*2}
+            sta   sprite_ptr0+{]2*4}
+            txa
+            jmp   ]3
+last_bit    lda   (SPRITE_VBUFF_PTR+{]1*2}),y
+            clc    ; pre-adjust these later
+            adc   _Sprites+TS_VBUFF_BASE+{]1*2}
+            sta   sprite_ptr0+{]2*4}
+            jmp   ]4
+next_bit
+            <<<
+
+; Specialization for the first sprite which can optimize its dispatch if its the only one
+;           dobit   bit_position,dest;next;exit
+dobit1      mac
+            lsr
+            bcc   next_bit
+            beq   last_bit
+            tax
+            lda   (SPRITE_VBUFF_PTR+{]1*2}),y
+            clc
+            adc   _Sprites+TS_VBUFF_BASE+{]1*2}
+            sta   sprite_ptr0+{]2*4}
+            txa
+            jmp   ]3
+last_bit    lda   (SPRITE_VBUFF_PTR+{]1*2}),y
+            clc    ; pre-adjust these later
+            adc   _Sprites+TS_VBUFF_BASE+{]1*2}
+            sta   sprite_ptr0+{]2*4}
+            tyx
+            jmp   (K_TS_ONE_SPRITE,x)
+next_bit
+            <<<
+
+; If we find a last bit (4th in this case) and will exit
+stpbit      mac
+            lsr
+            bcc   next_bit
+            lda   (SPRITE_VBUFF_PTR+{]1*2}),y
+            clc    ; pre-adjust these later
+            adc   _Sprites+TS_VBUFF_BASE+{]1*2}
+            sta   sprite_ptr0+{]2*4}
+            jmp   ]3
+next_bit
+            <<<
+
+; Last bit test which *must* be set
+endbit      mac
+            lda   (SPRITE_VBUFF_PTR+{]1*2}),y
+            clc    ; pre-adjust these later
+            adc   _Sprites+TS_VBUFF_BASE+{]1*2}
+            sta   sprite_ptr0+{]2*4}
+            jmp   ]3
+            <<<
+
+endbit1     mac
+            lda   (SPRITE_VBUFF_PTR+{]1*2}),y
+            clc    ; pre-adjust these later
+            adc   _Sprites+TS_VBUFF_BASE+{]1*2}
+            sta   sprite_ptr0+{]2*4}
+            tyx
+            jmp   (K_TS_ONE_SPRITE,x)
+            <<<
+
+; OPTIMIZATION:
+;
+;           bit     #$00FF                    ; Skip the first 8 bits if they are all zeros
+;           bne     norm_entry
+;           xba
+;           jmp     skip_entry
+;
+; Placed at the entry point
+
+; This is a complex, but fast subroutine that is called from the core tile rendering code.  It
+; Takes a bitmap of sprites in the Accumulator and then extracts the VBuff addresses for the
+; target TileStore entry and places them in specific direct page locations.
+;
+; Inputs:
+;  A = sprite bitmap (assumed to be non-zero)
+;  Y = tile store index
+;  D = second work page
+;  B = vbuff array bank
+; Output:
+;  X = 
+;
+; ]1 address of single sprite process
+; ]2 address of two sprite process
+; ]3 address of three sprite process
+; ]4 address of four sprite process
+
+SpriteBitsToVBuffAddrs mac
+           dobit1  0;0;b_1_1
+           dobit1  1;0;b_2_1
+           dobit1  2;0;b_3_1
+           dobit1  3;0;b_4_1
+           dobit1  4;0;b_5_1
+           dobit1  5;0;b_6_1
+           dobit1  6;0;b_7_1
+           dobit1  7;0;b_8_1
+           dobit1  8;0;b_9_1
+           dobit1  9;0;b_10_1
+           dobit1  10;0;b_11_1
+           dobit1  11;0;b_12_1
+           dobit1  12;0;b_13_1
+           dobit1  13;0;b_14_1
+           dobit1  14;0;b_15_1
+           endbit1 15;0
+
+b_1_1      dobit  1;1;b_2_2;]2
+b_2_1      dobit  2;1;b_3_2;]2
+b_3_1      dobit  3;1;b_4_2;]2
+b_4_1      dobit  4;1;b_5_2;]2
+b_5_1      dobit  5;1;b_6_2;]2
+b_6_1      dobit  6;1;b_7_2;]2
+b_7_1      dobit  7;1;b_8_2;]2
+b_8_1      dobit  8;1;b_9_2;]2
+b_9_1      dobit  9;1;b_10_2;]2
+b_10_1     dobit  10;1;b_11_2;]2
+b_11_1     dobit  11;1;b_12_2;]2
+b_12_1     dobit  12;1;b_13_2;]2
+b_13_1     dobit  13;1;b_14_2;]2
+b_14_1     dobit  14;1;b_15_2;]2
+b_15_1     endbit 15;1;]2
+
+b_2_2      dobit  2;2;b_3_3;]3
+b_3_2      dobit  3;2;b_4_3;]3
+b_4_2      dobit  4;2;b_5_3;]3
+b_5_2      dobit  5;2;b_6_3;]3
+b_6_2      dobit  6;2;b_7_3;]3
+b_7_2      dobit  7;2;b_8_3;]3
+b_8_2      dobit  8;2;b_9_3;]3
+b_9_2      dobit  9;2;b_10_3;]3
+b_10_2     dobit  10;2;b_11_3;]3
+b_11_2     dobit  11;2;b_12_3;]3
+b_12_2     dobit  12;2;b_13_3;]3
+b_13_2     dobit  13;2;b_14_3;]3
+b_14_2     dobit  14;2;b_15_3;]3
+b_15_2     endbit 15;2;]3
+
+b_3_3      stpbit 3;3;]4
+b_4_3      stpbit 4;3;]4
+b_5_3      stpbit 5;3;]4
+b_6_3      stpbit 6;3;]4
+b_7_3      stpbit 7;3;]4
+b_8_3      stpbit 8;3;]4
+b_9_3      stpbit 9;3;]4
+b_10_3     stpbit 10;3;]4
+b_11_3     stpbit 11;3;]4
+b_12_3     stpbit 12;3;]4
+b_13_3     stpbit 13;3;]4
+b_14_3     stpbit 14;3;]4
+b_15_3     endbit 15;3;]4
+           <<<
+
+; Store some tables in the K bank that will be used exclusively for jmp (abs,x) dispatch
+
+K_TS_BASE_TILE_DISP   ds TILE_STORE_SIZE      ; draw the tile without a sprite
+K_TS_COPY_TILE_DATA   ds TILE_STORE_SIZE      ; copy/merge the tile into temp storage
+K_TS_SPRITE_TILE_DISP ds TILE_STORE_SIZE      ; select the sprite routine for this tile
+K_TS_ONE_SPRITE       ds TILE_STORE_SIZE      ; specialized sprite routine when only one sprite covers the tile
+K_TS_APPLY_TILE_DATA  ds TILE_STORE_SIZE      ; move tile from temp storage into code field
\ No newline at end of file
diff --git a/src/Timer.s b/src/Timer.s
index fbb2b53..61f3332 100644
--- a/src/Timer.s
+++ b/src/Timer.s
@@ -1,37 +1,5 @@
-; Timer implementation
-;
-; The engire provides four timer slot that can be used by one-shot or 
-; recurring timers.  Each timer is given an initial tick count, a 
-; reset tick count (0 = one-shot), and an action to perform.
-;
-; The timers handle overflow, so if a recurring timer has a tick count of 3
-; and 7 VBL ticks have passed, then the timer will be fired twice and
-; a tick count of 2 will be set.
-;
-; As such, the timers are appropriate to drive physical and other game
-; behaviors at a frame-independent rate.
-;
-; A collection of 4 timers that are triggered when their countdown
-; goes below zero.  Each timer takes up 16 bytes
-;
-; A timer can fire multiple times during a singular evaluation.  For example, if the
-; timer delay is set to 1 and 3 VBL ticks happen, then the timer delta is -2, will fire,
-; have the delay added and get -1, fire again, increment to zero, first again and then
-; finally reset to 1.
-;
-; +0 counter         decremented by the number of ticks since last run
-; +2 reset           copied into counter when triggered. 0 turns off the timer.
-; +4 addr            long address of timer routine
-; +8 user            8 bytes of user data space for timer state
-MAX_TIMERS      equ       4
-TIMER_REC_SIZE  equ       16
+                mx %00
 
-lastTick        ds        2
-Timers          ds        TIMER_REC_SIZE*MAX_TIMERS
-
-GetVBLTicks     ENT
-                jsr       _GetVBLTicks
-                rtl
 _GetVBLTicks
                 PushLong  #0
                 _GetTick
@@ -42,7 +10,7 @@ _GetVBLTicks
 ; Initialize the timers
 InitTimers
                 jsr       _GetVBLTicks
-                sta       lastTick
+                sta       LastTick
 
                 lda       #0
                 ldx       #{TIMER_REC_SIZE*MAX_TIMERS}-2
@@ -63,17 +31,12 @@ InitTimers
 ; Return
 ;  C = 0 if success, 1 if no timer slots are available
 ;  A = timer slot ID if C = 0
-AddTimer        ENT
-                phb
-
+_AddTimer
                 php                                           ; Save the input parameters
                 phx
                 pha
                 phy
 
-                phk
-                plb
-
                 ldx       #0
 :loop           lda       Timers,x                            ; If the counter is zero, timer is free
                 beq       :freeslot
@@ -105,28 +68,23 @@ AddTimer        ENT
                 lda       Timers+0,x                          ; if not a one-shot, put the counter
                 sta       Timers+2,x                          ; value into the reset field
 
-:oneshot        plb
-                txa                                           ; return the slot ID and a success status
+:oneshot        txa                                           ; return the slot ID and a success status
                 clc
-                rtl
+                rts
 
 :notimers       ply
                 pla
                 plx
                 plp
-                plb
 
                 sec                                           ; Return an error status
                 lda       #0
-                rtl
+                rts
 
 ; Small function to remove a timer
 ;
 ; A = Timer ID
-RemoveTimer     ENT
-                phb
-                phk
-                plb
+_RemoveTimer
                 cmp       #{TIMER_REC_SIZE*{MAX_TIMERS-1}}+1
                 bcs       :exit
 
@@ -137,38 +95,51 @@ RemoveTimer     ENT
                 stz       Timers+6,x
 
 :exit
-                plb
-                rtl
+                rts
 
 ; Execute the timer functions
-DoTimers        ENT
-                phb
-                phk
-                plb
+;DoTimers        ENT
+;                phb
+;                jsr       _SetDataBank
+;
+;                jsr       _GetVBLTicks
+;
+;                cmp       LastTick                            ; Throttle to 60 fps
+;                beq       :exit
+;                tax                                           ; Calculate the increment
+;                sec
+;                sbc       LastTick
+;                stx       LastTick
 
-                jsr       _GetVBLTicks
-
-                cmp       lastTick                            ; Throttle to 60 fps
-                beq       :exit
-                tax                                           ; Calculate the increment
-                sec
-                sbc       lastTick
-                stx       lastTick
-
-; We don't want times to fire excessively.  If the timer has nt been evaluated for over 
+; We don't want times to fire excessively.  If the timer hasn't been evaluated for over 
 ; one second, then just skip processing and wait for the next call.
-                cmp       #60
-                bcs       :exit
+;                cmp       #60
+;                bcs       :exit
 
-                jsr       _DoTimers
+;                jsr       _DoTimers
 
-:exit           plb
-                rtl
+;:exit           plb
+;                rtl
 
 ; Countdown the timers
-;
-; A = number of elapsed ticks
 _DoTimers
+                jsr       _GetVBLTicks
+
+                cmp       LastTick                            ; Throttle to 60 fps
+                beq       :exit
+
+                tax                                           ; Calculate the increment
+                sec
+                sbc       LastTick
+                stx       LastTick
+
+; We don't want times to fire excessively.  If the timer hasn't been evaluated for over 
+; one second, then just skip processing and wait for the next call.
+                cmp       #60
+                bcc       :do_timer
+:exit           rts
+
+:do_timer
                 pha
                 ldx       #0
 :loop
@@ -186,9 +157,9 @@ _DoTimers
                 phx                                           ; Save our index
 
                 lda       Timers+4,x                          ; execute the timer callback
-                sta       :dispatch+1
+                stal      :dispatch+1
                 lda       Timers+5,x
-                sta       :dispatch+2
+                stal      :dispatch+2
 :dispatch       jsl       $000000
 
                 plx
diff --git a/src/Tool.s b/src/Tool.s
index c1ba0dd..bd8970c 100644
--- a/src/Tool.s
+++ b/src/Tool.s
@@ -3,10 +3,47 @@
 ; Ref: Toolbox Reference, Volume 2, Appendix A
 ; Ref: IIgs Tech Note #73
 
+                use   Mem.Macs.s
+                use   Misc.Macs.s
+                use   Util.Macs
+                use   Locator.Macs
+                use   Core.MACS.s
+
+                use   Defs.s
+                use   static/TileStoreDefs.s
+
 ToStrip         equ   $E10184
 
+; Define some macros to help streamline the entry and exit from the toolbox calls
+_TSEntry        mac
+                phd
+                phb
+                tcd
+                jsr  _SetDataBank
+                <<<
+
+_TSExit         mac
+                plb
+                pld
+                ldx     ]1                 ; Error code
+                ldy     ]2                 ; Number of stack bytes to remove
+                jml     ToStrip
+                <<<
+
+_TSExit1        mac
+                plb
+                pld
+;                ldx     ]1                 ; Error code already in X
+                ldy     ]1                 ; Number of stack bytes to remove
+                jml     ToStrip
+                <<<
+
+FirstParam      equ     10                  ; When using the _TSEntry macro, the first parameter is at 10,s
+
+                mx    %00
+
 _CallTable
-                dw    {_CTEnd-_CallTable}/4,0
+                adrl  {_CTEnd-_CallTable}/4
                 adrl  _TSBootInit-1
                 adrl  _TSStartUp-1
                 adrl  _TSShutDown-1
@@ -16,8 +53,63 @@ _CallTable
                 adrl  _TSReserved-1
                 adrl  _TSReserved-1
 
-                adrl  _TSSetScreenMode
+                adrl  _TSReadControl-1
+                adrl  _TSSetScreenMode-1
+                adrl  _TSSetTile-1
+                adrl  _TSSetBG0Origin-1
+                adrl  _TSRender-1
+                adrl  _TSLoadTileSet-1
+                adrl  _TSCreateSpriteStamp-1
+                adrl  _TSAddSprite-1
+                adrl  _TSMoveSprite-1
+                adrl  _TSUpdateSprite-1
+                adrl  _TSRemoveSprite-1
+
+                adrl  _TSGetSeconds-1
+
+                adrl  _TSCopyTileToDynamic-1
+
+                adrl  _TSSetPalette-1
+                adrl  _TSCopyPicToBG1-1
+                adrl  _TSBindSCBArray-1
+                adrl  _TSGetBG0TileMapInfo-1
+                adrl  _TSGetScreenInfo-1
+                adrl  _TSSetBG1Origin-1
+                adrl  _TSGetTileAt-1
+
+                adrl  _TSSetBG0TileMapInfo-1
+                adrl  _TSSetBG1TileMapInfo-1
+
+                adrl  _TSAddTimer-1
+                adrl  _TSRemoveTimer-1
+                adrl  _TSStartScript-1
+
+                adrl  _TSSetOverlay-1
+                adrl  _TSClearOverlay-1
+
+                adrl  _TSGetTileDataAddr-1
+                adrl  _TSFillTileStore-1
+                adrl  _TSRefresh-1
 _CTEnd
+_GTEAddSprite        MAC
+                     UserTool  $1000+GTEToolNum
+                     <<<
+_GTEMoveSprite       MAC
+                     UserTool  $1100+GTEToolNum
+                     <<<
+_GTEUpdateSprite     MAC
+                     UserTool  $1200+GTEToolNum
+                     <<<
+_GTERemoveSprite     MAC
+                     UserTool  $1300+GTEToolNum
+                     <<<
+; Helper function to set the data back to the toolset default
+_SetDataBank    sep  #$20
+                lda  #^TileStore
+                pha
+                plb
+                rep  #$20
+                rts
 
 ; Do nothing when the tool set is installed
 _TSBootInit
@@ -25,40 +117,66 @@ _TSBootInit
                 clc
                 rtl
 
-; Call the regular GTE startup function after setting the Work Area Point (WAP).  The caller much provide
-; one page of Bank 0 memory for the tool set's private use
+; Call the regular GTE startup function after setting the Work Area Pointer (WAP).  The caller must provide
+; one page of Bank 0 memory for the tool set's private use and a userId to use for allocating memory
 ;
-; X = 
+; X = tool set number in low byte and function number in high byte
+;
+; StartUp(dPageAddr, capFlags, userId)
 _TSStartUp
-:zpToUse        equ     7
 
-                pea     #$8000
+userId          =    7
+capFlags        =    userId+2
+zpToUse         =    userId+4
+
+                lda     zpToUse,s          ; Get the direct page address
+                phd                        ; Save the current direct page
+                tcd                        ; Set to our working direct page space
+
                 txa
-                and     #$00FF
-                pha
+                and     #$00FF             ; Get just the tool number
+                sta     ToolNum
 
-                pea     $0000
-                lda     :zpToUse+6,s
-                pha
+                lda     userId+2,s         ; Get the userId for memory allocations
+                sta     UserId
+
+                lda     capFlags+2,s       ; Get the engine capability bits
+                sta     EngineMode
+
+                phb
+                jsr     _SetDataBank
+                jsr     _CoreStartUp       ; Initialize the library
+                plb
+
+; SetWAP(userOrSystem, tsNum, waptPtr)
+
+                pea     #$8000             ; $8000 = user tool set
+                pei     ToolNum            ; Push the tool number from the direct page
+                pea     $0000              ; High word of WAP is zero (bank 0)
+                phd                        ; Low word of WAP is the direct page
                 _SetWAP
 
-                jsr     _CoreStartUp
+                pld                        ; Restore the caller's direct page
 
+                ldx     #0                 ; No error
+                ldy     #6                 ; Remove the 6 input bytes
+                jml     ToStrip
+
+; ShutDown()
 _TSShutDown
                 cmp     #0                 ; Acc is low word of the WAP (direct page)
                 beq     :inactive
 
                 phd
-                pha
-                pld                        ; Set the direct page for the toolset
+                tcd                        ; Set the direct page for the toolset
 
-                phx                        ; Preserve the X register
-                jsr     _CoreShutDown      ; Shut down GTE
-                pla
+                phb
+                jsr     _SetDataBank
+                jsr     _CoreShutDown      ; Shut down the library
+                plb
 
                 pea     $8000
-                and     #$00FF
-                pha
+                pei     ToolNum
                 pea     $0000              ; Set WAP to null
                 pea     $0000
                 _SetWAP
@@ -71,7 +189,7 @@ _TSShutDown
                 rtl
 
 _TSVersion
-                lda     #$0100     ; Version 1
+                lda     #$0100             ; Version 1
                 sta     7,s
 
                 lda     #0
@@ -88,7 +206,7 @@ _TSStatus
                 sta    1,s
                 tya
                 ora    1,s
-                sta    1,s        ; 0 if WAP is null, non-zero if WAP is set
+                sta    1,s                ; 0 if WAP is null, non-zero if WAP is set
 
                 lda     #0
                 clc
@@ -101,31 +219,523 @@ _TSReserved
                 sec
                 rtl
 
+; SetScreenMode(width, height)
 _TSSetScreenMode
-                phd                       ; Preserve the direct page
-                pha
-                pld
+height          equ     FirstParam
+width           equ     FirstParam+2
 
-                lda     9,s
+                _TSEntry
+
+                lda     height,s
                 tay
-                lda     9,s
+                lda     width,s
                 tax
                 jsr     _SetScreenMode
-                pld
 
-                ldx     #0                 ; No error
-                ldy     #4                 ; Remove the 4 input bytes
-                jml     ToStrip
+                _TSExit #0;#4
 
+; ReadControl()
 _TSReadControl
-                phd                       ; Preserve the direct page
-                pha
-                pld
+:output         equ     FirstParam
+
+                _TSEntry
 
                 jsr     _ReadControl
-                sta     9,s
+                sta     :output,s
 
-                pld
-                ldx     #0                 ; No error
-                ldy     #0                 ; Remove zero input bytes
-                jml     ToStrip
+                _TSExit  #0;#0
+
+; SetTile(xTile, yTile, tileId)
+_TSSetTile
+tileId          equ     FirstParam
+yTile           equ     FirstParam+2
+xTile           equ     FirstParam+4
+
+                _TSEntry
+
+                lda     xTile,s                ; Valid range [0, 40] (41 columns)
+                tax
+                lda     yTile,s                ; Valid range [0, 25] (26 rows)
+                tay
+                lda     tileId,s
+                jsr     _SetTile
+
+                _TSExit #0;#6
+
+; SetBG0Origin(x, y)
+_TSSetBG0Origin
+yPos            equ     FirstParam
+xPos            equ     FirstParam+2
+
+                _TSEntry
+
+                lda     xPos,s
+                jsr     _SetBG0XPos
+                lda     yPos,s
+                jsr     _SetBG0YPos
+
+                _TSExit #0;#4
+
+; Render()
+_TSRender
+                _TSEntry
+                 jsr     _Render
+                _TSExit #0;#0
+
+; LoadTileSet(Pointer)
+_TSLoadTileSet
+TSPtr           equ     FirstParam
+
+                _TSEntry
+
+                lda     TSPtr+2,s
+                tax
+                lda     TSPtr,s
+                jsr     _LoadTileSet
+
+                _TSExit #0;#4
+
+; CreateSpriteStamp(spriteId: Word, vbuffAddr: Word)
+_TSCreateSpriteStamp
+:vbuff          equ     FirstParam
+:spriteId       equ     FirstParam+2
+
+                _TSEntry
+
+                lda     :vbuff,s
+                tay
+                lda     :spriteId,s
+                jsr     _CreateSpriteStamp
+
+                _TSExit #0;#4
+
+_TSAddSprite
+:spriteSlot     equ    FirstParam+0
+:spriteY        equ    FirstParam+2
+:spriteX        equ    FirstParam+4
+:spriteId       equ    FirstParam+6
+
+                _TSEntry
+
+                lda    :spriteY,s
+                and    #$00FF
+                xba
+                sta    :spriteY,s
+                lda    :spriteX,s
+                and    #$00FF
+                ora    :spriteY,s
+                tay
+
+                lda    :spriteSlot,s
+                tax
+
+                lda    :spriteId,s
+                jsr    _AddSprite
+
+                _TSExit #0;#8
+
+_TSMoveSprite
+:spriteY        equ    FirstParam+0
+:spriteX        equ    FirstParam+2
+:spriteSlot     equ    FirstParam+4
+                _TSEntry
+
+                lda    :spriteX,s
+                tax
+                lda    :spriteY,s
+                tay
+                lda    :spriteSlot,s
+                jsr    _MoveSprite
+
+                _TSExit #0;#6
+
+_TSUpdateSprite
+:vbuff          equ    FirstParam+0
+:spriteFlags    equ    FirstParam+2
+:spriteSlot     equ    FirstParam+4
+                _TSEntry
+
+                lda    :spriteFlags,s
+                tax
+                lda    :vbuff,s
+                tay
+                lda    :spriteSlot,s
+                jsr    _UpdateSprite
+
+                _TSExit #0;#6
+
+_TSRemoveSprite
+:spriteSlot     equ    FirstParam+0
+                _TSEntry
+
+                lda    :spriteSlot,s
+                jsr    _RemoveSprite
+
+                _TSExit #0;#2
+
+_TSGetSeconds
+:output         equ     FirstParam
+
+                _TSEntry
+
+                ldal    OneSecondCounter
+                sta     :output,s
+
+                _TSExit  #0;#0
+
+_TSCopyTileToDynamic
+:dynId          equ    FirstParam+0
+:tileId         equ    FirstParam+2
+                _TSEntry
+
+                lda     EngineMode
+                bit     #ENGINE_MODE_DYN_TILES
+                beq     :notEnabled
+
+                lda     :tileId,s
+                tax
+                lda     :dynId,s
+                tay
+                jsr     CopyTileToDyn
+
+:notEnabled
+                _TSExit  #0;#4
+
+
+; SetPalette(palNum, Pointer)
+_TSSetPalette
+:ptr            equ    FirstParam+0
+:palNum         equ    FirstParam+4
+
+                _TSEntry
+
+                phb
+                lda     :ptr+3,s                ; add one extra byte for the phb
+                xba
+                pha
+                plb
+                plb
+
+                lda     :ptr+1,s
+                tax
+                lda     :palNum+1,s
+                jsr     _SetPalette
+                plb
+
+                _TSExit  #0;#6
+
+_TSCopyPicToBG1
+:ptr            equ    FirstParam+0
+
+                _TSEntry
+
+                lda     BG1DataBank
+                tay
+                lda     :ptr+2,s
+                tax
+                lda     :ptr,s
+                jsr     _CopyPicToBG1
+
+                _TSExit  #0;#4
+
+_TSBindSCBArray
+:ptr            equ    FirstParam+0
+
+                _TSEntry
+
+                lda     :ptr,s
+                tax
+                lda     :ptr+2,s
+                jsr     _BindSCBArray
+
+                _TSExit  #0;#4
+
+_TSGetBG0TileMapInfo
+:ptr            equ     FirstParam+4
+:height         equ     FirstParam+2
+:width          equ     FirstParam+0
+                _TSEntry
+
+                lda     TileMapWidth
+                sta     :width,s
+                lda     TileMapHeight
+                sta     :height,s
+                lda     TileMapPtr
+                sta     :ptr,s
+                lda     TileMapPtr+2
+                sta     :ptr+2,s
+
+                _TSExit  #0;#0
+
+
+_TSGetScreenInfo
+:height         equ     FirstParam+6
+:width          equ     FirstParam+4
+:y              equ     FirstParam+2
+:x              equ     FirstParam+0
+                _TSEntry
+
+                lda     ScreenX0
+                sta     :x,s
+                lda     ScreenY0
+                sta     :y,s
+                lda     ScreenWidth
+                sta     :width,s
+                lda     ScreenHeight
+                sta     :height,s
+
+                _TSExit  #0;#0
+
+; SetBG1Origin(x, y)
+_TSSetBG1Origin
+:y              equ     FirstParam
+:x              equ     FirstParam+2
+
+                _TSEntry
+
+                lda     :x,s
+                jsr     _SetBG1XPos
+                lda     :y,s
+                jsr     _SetBG1YPos
+
+                _TSExit #0;#4
+
+; GetTileAt(x, y)
+_TSGetTileAt
+:y            equ     FirstParam
+:x            equ     FirstParam+2
+:output       equ     FirstParam+4
+
+                _TSEntry
+
+; Convert the x, y coordinated to tile store block coordinates
+                lda  :x,s
+                tax
+                lda  :y,s
+                tay
+                jsr  _GetTileAt
+                bcc  :ok
+                lda  #0
+                bra  :out
+
+; Load the tile at that tile store location
+
+:ok
+                jsr  _GetTileStoreOffset0          ; Get the address of the X,Y tile position
+                tax
+                lda  TileStore+TS_TILE_ID,x
+:out
+                sta  :output,s
+
+                _TSExit #0;#4
+
+; SetBG0TileMapInfo(width, height, ptr)
+_TSSetBG0TileMapInfo
+:ptr            equ     FirstParam+0
+:height         equ     FirstParam+4
+:width          equ     FirstParam+6
+
+                _TSEntry
+
+                lda     :width,s
+                sta     TileMapWidth
+                lda     :height,s
+                sta     TileMapHeight
+                lda     :ptr,s
+                sta     TileMapPtr
+                lda     :ptr+2,s
+                sta     TileMapPtr+2
+
+                lda     #DIRTY_BIT_BG0_REFRESH     ; force a refresh of the BG0 on the next Render
+                tsb     DirtyBits
+
+                _TSExit #0;#8
+
+; SetBG1TileMapInfo(width, height, ptr)
+_TSSetBG1TileMapInfo
+:ptr            equ     FirstParam+0
+:height         equ     FirstParam+4
+:width          equ     FirstParam+6
+
+                _TSEntry
+
+                lda     :width,s
+                sta     BG1TileMapWidth
+                lda     :height,s
+                sta     BG1TileMapHeight
+                lda     :ptr,s
+                sta     BG1TileMapPtr
+                lda     :ptr+2,s
+                sta     TileMapPtr+2
+
+                _TSExit #0;#8
+
+; AddTimer(numTicks, callback, flags)
+_TSAddTimer
+:flags          equ     FirstParam+0
+:callback       equ     FirstParam+2
+:numTicks       equ     FirstParam+6
+:output         equ     FirstParam+8
+
+                _TSEntry
+
+                lda     :callback+2,s
+                tax
+                lda     :callback,s
+                tay
+                lda     :flags,s
+                lsr                        ; put low bit into carry
+                lda     :numTicks,s
+                jsr     _AddTimer
+                sta     :output,s
+                ldx     #0
+                bcc     :no_err
+                ldx     #NO_TIMERS_AVAILABLE
+:no_err
+                _TSExit1 #8
+
+; RemoveTimer(timerId)
+_TSRemoveTimer
+:timerId        equ     FirstParam+0
+
+                _TSEntry
+
+                lda     :timerId,s
+                jsr     _RemoveTimer
+
+                _TSExit #0;#2
+
+
+; StartScript(timerId)
+_TSStartScript
+:scriptAddr     equ     FirstParam+0
+:numTicks       equ     FirstParam+4
+
+                _TSEntry
+
+                lda     :numTicks,s
+                tay
+                lda     :scriptAddr+2,s
+                tax
+                lda     :scriptAddr,s
+                jsr     _StartScript
+
+                _TSExit #0;#6
+; SetOverlay(top, bottom, proc)
+_TSSetOverlay
+:proc           equ     FirstParam+0
+:bottom         equ     FirstParam+4
+:top            equ     FirstParam+6
+
+                _TSEntry
+
+                lda     #1
+                sta     Overlays
+                lda     :top,s
+                sta     Overlays+2
+                lda     :bottom,s
+                sta     Overlays+4
+                lda     :proc,s
+                sta     Overlays+6
+                lda     :proc+2,s
+                sta     Overlays+8
+
+                _TSExit #0;#8
+
+; ClearOverlay()
+_TSClearOverlay
+
+                _TSEntry
+
+                lda     #0
+                sta     Overlays
+
+                _TSExit #0;#0
+
+; GetTileDataAddr()
+_TSGetTileDataAddr
+:output         equ     FirstParam+0
+
+                 _TSEntry
+
+                lda     #tiledata
+                sta     :output,s
+                lda     #^tiledata
+                sta     :output+2,s
+
+                _TSExit #0;#0
+
+; FillTileStore(tileId)
+_TSFillTileStore
+:tileId         equ     FirstParam+0
+
+                _TSEntry
+
+                stz    tmp0   
+:oloop
+                stz    tmp1
+:iloop
+                ldx    tmp1
+                ldy    tmp0
+                lda    :tileId,s
+                jsr    _SetTile
+                
+                lda    tmp1
+                inc
+                sta    tmp1
+                cmp    #TILE_STORE_WIDTH
+                bcc    :iloop
+
+                lda    tmp0
+                inc
+                sta    tmp0
+                cmp    #TILE_STORE_HEIGHT
+                bcc    :oloop
+
+                _TSExit #0;#2
+
+; _TSRefresh()
+_TSRefresh
+                _TSEntry
+
+                ldx  #TILE_STORE_SIZE-2
+:loop           jsr  _PushDirtyTileX
+                dex
+                dex
+                bpl  :loop
+
+                _TSExit #0;#0
+
+; Insert the GTE code
+
+                put     Math.s
+                put     CoreImpl.s
+                put     Memory.s
+                put     Timer.s
+                put     Script.s
+                put     TileMap.s
+                put     Graphics.s
+                put     Tiles.s
+                put     Sprite.s
+                put     Sprite2.s
+                put     SpriteRender.s
+                put     Render.s
+                put     render/Render.s
+                put     render/Fast.s
+                put     render/Slow.s
+                put     render/Dynamic.s
+                put     render/TwoLayer.s
+                put     render/Sprite1.s
+                put     render/Sprite2.s
+                put     tiles/DirtyTileQueue.s
+                put     blitter/SCB.s
+                put     blitter/Horz.s
+                put     blitter/Vert.s
+                put     blitter/BG0.s
+                put     blitter/BG1.s
+                put     blitter/Template.s
+                put     blitter/TemplateUtils.s
+                put     blitter/Blitter.s
+                put     blitter/TileProcs.s
+                put     blitter/Tiles00000.s
+;                put     blitter/Tiles.s
diff --git a/src/_FileInformation.txt b/src/_FileInformation.txt
new file mode 100644
index 0000000..8b4a06a
--- /dev/null
+++ b/src/_FileInformation.txt
@@ -0,0 +1 @@
+Tool160=Type(BA),AuxType(0000),VersionCreate(70),MinVersion(BE),Access(E3),FolderInfo1(000000000000000000000000000000000000),FolderInfo2(000000000000000000000000000000000000)
diff --git a/src/blitter/BG0.s b/src/blitter/BG0.s
index 31da819..32519af 100644
--- a/src/blitter/BG0.s
+++ b/src/blitter/BG0.s
@@ -1,4 +1,4 @@
-; Support routinges for the primary background
+; Support routines for the primary background
 _InitBG0
                  lda   #DIRTY_BIT_BG0_X+DIRTY_BIT_BG0_Y
                  tsb   DirtyBits
@@ -8,14 +8,6 @@ _InitBG0
 ;
 ; A=low word of picture address
 ; X=high word of pixture address
-CopyBinToField   ENT
-                 phb
-                 phk
-                 plb
-                 jsr   _CopyBinToField
-                 plb
-                 rtl
-
 _CopyBinToField
 :srcptr          equ   tmp0
 :line_cnt        equ   tmp2
@@ -222,14 +214,6 @@ _CopyBinToField
 ; X=high workd of pixture address
 ;
 ; Picture must be within one bank
-CopyPicToField   ENT
-                 phb
-                 phk
-                 plb
-                 jsr   _CopyPicToField
-                 plb
-                 rtl
-
 _CopyPicToField
 :srcptr          equ   tmp0
 :line_cnt        equ   tmp2
diff --git a/src/blitter/BG1.s b/src/blitter/BG1.s
index c8718fe..71639fa 100644
--- a/src/blitter/BG1.s
+++ b/src/blitter/BG1.s
@@ -4,20 +4,11 @@ _InitBG1
                           jsr   _ApplyBG1XPos
                           rts
 
-
 ; Copy a binary image data file into BG1.  Assumes the file is the correct size (328 x 208)
 ;
 ; A=low word of picture address
 ; X=high word of pixture address
 ; Y=high word of BG1 bank
-CopyBinToBG1              ENT
-                          phb
-                          phk
-                          plb
-                          jsr   _CopyBinToBG1
-                          plb
-                          rtl
-
 _CopyBinToBG1
 :src_width                equ   tmp6
 :src_height               equ   tmp7
@@ -40,14 +31,6 @@ _CopyBinToBG1
 ; A=low word of picture address
 ; X=high word of pixture address
 ; Y=high word of BG1 bank
-CopyPicToBG1              ENT
-                          phb
-                          phk
-                          plb
-                          jsr   _CopyPicToBG1
-                          plb
-                          rtl
-
 _CopyPicToBG1
 :src_width                equ   tmp6
 :src_height               equ   tmp7
@@ -193,59 +176,6 @@ _ApplyBG1XPos
                           pld
                           rts
 
-ANGLEBNK                  ext
-ApplyBG1XPosAngle         ENT
-                          phb
-                          phk
-                          plb
-                          jsr   _ApplyBG1XPosAngle
-                          plb
-                          rtl
-
-_ApplyBG1XPosAngle
-;                          phy
-
-;                          lda   BG1StartX
-;                          jsr   Mod164
-;                          sta   BG1StartXMod164
-
-;                          lda   #162
-;                          sec
-;                          sbc   StartXMod164
-;                          bpl   *+6
-;                          clc
-;                          adc   #164
-;                          clc
-;                          adc   BG1StartXMod164
-;                          cmp   #164
-;                          bcc   *+5
-;                          sbc   #164
-
-;                          clc
-;                          adc   1,s
-;                          tay                             ; cache the value
-
-;                          pla                             ; pop the value
-                          phd                             ; save the direct page because we are going to switch to the
-                          lda   BlitterDP                 ; blitter direct page space and fill in the addresses
-                          tcd
-
-                          lda   #^ANGLEBNK
-                          sta   $fe
-                          sty   $fc                       ; Store in the new direct page
-                          ldy   #162
-                          tyx
-:loop
-                          lda   [$fc],y
-                          sta   00,x                      ; store the value
-                          dey
-                          dey
-                          dex
-                          dex
-                          bpl   :loop
-                          pld
-                          rts
-
 _ClearBG1Buffer
                           phb
                           pha
@@ -266,88 +196,6 @@ _ClearBG1Buffer
 
                           plb
                           rts
-ApplyBG1YPosAngle         ENT
-                          phb
-                          phk
-                          plb
-                          jsr   _ApplyBG1YPosAngle
-                          plb
-                          rtl
-
-_ApplyBG1YPosAngle
-:virt_line                equ   tmp0
-:lines_left               equ   tmp1
-:draw_count               equ   tmp2
-:ytbl_idx                 equ   tmp3
-:angle_tbl                equ   tmp4
-
-                          sty   :angle_tbl
-
-                          lda   BG1StartY
-                          jsr   Mod208
-                          sta   BG1StartYMod208
-                          sta   :ytbl_idx                 ; Start copying from the first entry in the table
-
-                          lda   StartYMod208              ; This is the base line of the virtual screen
-                          sta   :virt_line                ; Keep track of it
-
-                          lda   ScreenHeight
-                          sta   :lines_left
-
-:loop
-                          lda   :virt_line
-                          asl
-                          tax
-                          ldal  BTableLow,x               ; Get the address of the first code field line
-                          tay
-
-                          sep   #$20
-                          ldal  BTableHigh,x
-                          pha                             ; push the bank on the stack
-                          plb
-                          rep   #$20
-
-                          lda   :virt_line
-                          and   #$000F
-                          eor   #$FFFF
-                          inc
-                          clc
-                          adc   #16
-                          min   :lines_left
-
-                          sta   :draw_count               ; Do this many lines
-                          asl
-                          tax
-
-                          lda   :ytbl_idx                 ; Read from this location (duplicate every 4 lines)
-                          lsr
-                          lsr
-                          asl
-                          clc
-                          adc   :angle_tbl
-                          sec
-                          sbc   #ANGLEBNK
-                          jsr   CopyAngleYTableToBG1Addr  ; or CopyBG1YTableToBG1Addr2
-
-                          lda   :virt_line                ; advance to the virtual line after the segment we just
-                          clc                             ; filled in
-                          adc   :draw_count
-                          sta   :virt_line
-
-                          lda   :ytbl_idx                 ; advance the index into the YTable
-                          adc   :draw_count
-                          sta   :ytbl_idx
-
-                          lda   :lines_left               ; subtract the number of lines we just completed
-                          sec
-                          sbc   :draw_count
-                          sta   :lines_left
-
-                          jne   :loop
-
-                          phk
-                          plb
-                          rts
 
 ; Everytime either BG1 or BG0 Y-position changes, we have to update the Y-register
 ; value in all of the code fields (within the visible screen)
@@ -357,6 +205,8 @@ _ApplyBG1YPos
 :draw_count               equ   tmp2
 :ytbl_idx                 equ   tmp3
 
+                          phb                             ; Save the bank
+
                           lda   BG1StartY
                           jsr   Mod208
                           sta   BG1StartYMod208
@@ -413,7 +263,6 @@ _ApplyBG1YPos
 
                           jne   :loop
 
-                          phk
                           plb
                           rts
 
@@ -494,97 +343,6 @@ CopyBG1YTableToBG1Addr
                           sta:  BG1_ADDR+$0000,y
 :none                     rts
 
-; Unrolled copy routine to move y_angle entries into BG1_ADDR position with an additional
-; shift.  This has to be split into two 
-;
-; A = index into the array (x2)
-; Y = starting line * $1000
-; X = number of lines (x2)
-CopyAngleYTableToBG1Addr
-                          phx
-                          phb
-
-                          phk                             ; restore access to this bank
-                          plb
-                          jsr   SaveBG1AngleValues
-
-                          plb
-                          plx                             ; x is used directly in this routine
-                          jsr   ApplyBG1OffsetValues
-                          rts
-
-SaveBG1AngleValues
-                          jmp   (:tbl,x)
-:tbl                      da    :none
-                          da    :do01,:do02,:do03,:do04
-                          da    :do05,:do06,:do07,:do08
-                          da    :do09,:do10,:do11,:do12
-                          da    :do13,:do14,:do15,:do16
-:do15                     tax
-                          bra   :x15
-:do14                     tax
-                          bra   :x14
-:do13                     tax
-                          bra   :x13
-:do12                     tax
-                          bra   :x12
-:do11                     tax
-                          bra   :x11
-:do10                     tax
-                          bra   :x10
-:do09                     tax
-                          bra   :x09
-:do08                     tax
-                          bra   :x08
-:do16                     tax
-                          ldal  ANGLEBNK+06,x
-                          sta   BG1YCache+30
-:x15                      ldal  ANGLEBNK+06,x
-                          sta   BG1YCache+28
-:x14                      ldal  ANGLEBNK+06,x
-                          sta   BG1YCache+26
-:x13                      ldal  ANGLEBNK+06,x
-                          sta   BG1YCache+24
-:x12                      ldal  ANGLEBNK+04,x
-                          sta   BG1YCache+22
-:x11                      ldal  ANGLEBNK+04,x
-                          sta   BG1YCache+20
-:x10                      ldal  ANGLEBNK+04,x
-                          sta   BG1YCache+18
-:x09                      ldal  ANGLEBNK+04,x
-                          sta   BG1YCache+16
-:x08                      ldal  ANGLEBNK+02,x
-                          sta   BG1YCache+14
-:x07                      ldal  ANGLEBNK+02,x
-                          sta   BG1YCache+12
-:x06                      ldal  ANGLEBNK+02,x
-                          sta   BG1YCache+10
-:x05                      ldal  ANGLEBNK+02,x
-                          sta   BG1YCache+08
-:x04                      ldal  ANGLEBNK+00,x
-                          sta   BG1YCache+06
-:x03                      ldal  ANGLEBNK+00,x
-                          sta   BG1YCache+04
-:x02                      ldal  ANGLEBNK+00,x
-                          sta   BG1YCache+02
-:x01                      ldal  ANGLEBNK+00,x
-                          sta   BG1YCache+00
-:none                     rts
-:do07                     tax
-                          bra   :x07
-:do06                     tax
-                          bra   :x06
-:do05                     tax
-                          bra   :x05
-:do04                     tax
-                          bra   :x04
-:do03                     tax
-                          bra   :x03
-:do02                     tax
-                          bra   :x02
-:do01                     tax
-                          bra   :x01
-
 ; Unrolled copy routine to move BG1YTable entries into BG1_ADDR position with an additional
 ; shift.  This has to be split into two 
 ;
@@ -596,16 +354,14 @@ CopyBG1YTableToBG1Addr2
                           phx
                           phb
 
-                          phk                             ; restore access to this bank
-                          plb
+                          jsr   _SetDataBank              ; restore access to this bank
                           ldy   BG1OffsetIndex            ; Get the offset and save the values
                           jsr   SaveBG1OffsetValues
 
                           plb
                           plx                             ; x is used directly in this routine
                           ply
-                          jsr   ApplyBG1OffsetValues
-                          rts
+                          jmp   ApplyBG1OffsetValues
 
 SaveBG1OffsetValues
                           jmp   (:tbl,x)
@@ -738,7 +494,3 @@ ApplyBG1OffsetValues
 :none                     rts
 
 BG1YCache                 ds    32
-
-
-
-
diff --git a/src/blitter/Blitter.s b/src/blitter/Blitter.s
index 54c3316..44d5f36 100644
--- a/src/blitter/Blitter.s
+++ b/src/blitter/Blitter.s
@@ -18,7 +18,7 @@ _BltRange
 
                 dey
                 tya                  ; Get the address of the line that we want to return from
-                adc   StartY         ; and create a pointer to it
+                adc   StartYMod208   ; and create a pointer to it
                 asl
                 tay
                 lda   BTableLow,y
@@ -27,16 +27,16 @@ _BltRange
                 sta   :exit_ptr+2
 
                 txa                  ; get the first line (0 - 199)
-                adc   StartY         ; add in the virtual offset (0, 207) -- max value of 406
+                adc   StartYMod208   ; add in the virtual offset (0, 207) -- max value of 406
                 asl
                 tax                  ; this is the offset into the blitter table
 
                 sep   #$20           ; 8-bit Acc
                 lda   BTableHigh,x   ; patch in the bank
-                sta   blt_entry+3
+                stal  blt_entry+3
 
                 lda   BTableLow+1,x  ; patch in the page
-                sta   blt_entry+2
+                stal  blt_entry+2
 
 ; The way we patch the exit code is subtle, but very fast.  The CODE_EXIT offset points to
 ; an JMP/JML instruction that transitions to the next line after all of the code has been
@@ -51,6 +51,11 @@ _BltRange
                 lda   #FULL_RETURN   ; this is the offset of the return code
                 sta   [:exit_ptr],y  ; patch out the low byte of the JMP/JML
 
+;                lda   StartYMod208
+;                cmp   #63
+;                bne   *+4
+;                brk   $40
+
 ; Now we need to set up the Bank, Stack Pointer and Direct Page registers for calling into 
 ; the code field
 
@@ -59,7 +64,7 @@ _BltRange
 ;                beq   :primary
 ;                lda   BG1AltBank
 ;                bra   :alt
-:primary        lda   BG1DataBank
+:primary        lda   BG1DataBank    ; This is $00 if the TWO_LAYER bit of EngineMode is not set
 :alt
                 pha
                 plb
diff --git a/src/blitter/Horz.s b/src/blitter/Horz.s
index a069313..eb7aa5d 100644
--- a/src/blitter/Horz.s
+++ b/src/blitter/Horz.s
@@ -3,33 +3,6 @@
 ; when the virtual X-position of the play field changes.
 
 
-; SetBG0XPos
-;
-; Set the virtual horizontal position of the primary background layer.  In addition to 
-; updating the direct page state locations, this routine needs to preserve the original
-; value as well.  This is a bit subtle, because if this routine is called multiple times
-; with different values, we need to make sure the *original* value is preserved and not
-; continuously overwrite it.
-;
-; We assume that there is a clean code field in this routine
-SetBG0XPos          ENT
-                    jsr   _SetBG0XPos
-                    rtl
-
-_SetBG0XPos
-                    cmp   StartX
-                    beq   :out                       ; Easy, if nothing changed, then nothing changes
-
-                    ldx   StartX                     ; Load the old value (but don't save it yet)
-                    sta   StartX                     ; Save the new position
-
-                    lda   #DIRTY_BIT_BG0_X
-                    tsb   DirtyBits                  ; Check if the value is already dirty, if so exit
-                    bne   :out                       ; without overwriting the original value
-
-                    stx   OldStartX                  ; First change, so preserve the value
-:out                rts
-
 ; Simple function that restores the saved opcode that are stashed in _applyBG0Xpos.  It is
 ; very important that opcodes are restored before new ones are inserted, because there is 
 ; only one, fixed storage location and old values will be overwritten if operations are not
@@ -48,6 +21,8 @@ _RestoreBG0Opcodes
 :draw_count_x2      equ   tmp3
 :exit_offset        equ   tmp4
 
+                    phb                              ; Save data bank
+
                     asl
                     sta   :virt_line_x2              ; Keep track of it
 
@@ -57,7 +32,6 @@ _RestoreBG0Opcodes
 
                     lda   LastPatchOffset            ; If zero, there are no saved opcodes
                     sta   :exit_offset
-                    beq   :loop
 
 :loop
                     ldx   :virt_line_x2
@@ -102,7 +76,6 @@ _RestoreBG0Opcodes
                     stz   LastPatchOffset            ; Clear the value once completed
 
 :out
-                    phk
                     plb
                     rts
 
@@ -306,6 +279,7 @@ _ApplyBG0XPos
 ; 2. Writes the BRA instruction to exit the code field
 ; 3. Writes the JMP entry point to enter the code field
 
+                    phb                              ; Save the existing bank
 :loop
                     lda   :virt_line
                     asl                              ; This will clear the carry bit
@@ -380,7 +354,7 @@ _ApplyBG0XPos
                     ldx   :draw_count_x2
                     ldy   :base_address         ; Y-register is preserved, this can be removed
                     pei   :exit_address
-                    jmp   :SaveHighOperand           ; Only used once, so "inline" it
+                    jmp   :SaveHighOperand      ; Only used once, so "inline" it
 :save_high_op_rtn
 
 :not_odd
@@ -401,7 +375,6 @@ _ApplyBG0XPos
 
                     jne   :loop
 
-                    phk
                     plb
                     rts
 
diff --git a/src/blitter/PEISlammer.s b/src/blitter/PEISlammer.s
index 7eedffd..888335d 100644
--- a/src/blitter/PEISlammer.s
+++ b/src/blitter/PEISlammer.s
@@ -15,13 +15,13 @@
 _PEISlam
                  lda   ScreenWidth
                  dec
-                 sta   :screen_width_1  ; save the width-1 outside of the direct page
+                 stal  :screen_width_1  ; save the width-1 outside of the direct page
 
                  lda   #:pei_end        ; patch the PEI entry address
                  and   #$FFFE           ; should always be even, but....
                  sec
                  sbc   ScreenWidth
-                 sta   :inner+1
+                 stal  :inner+1
 
                  phx
                  tya
@@ -43,7 +43,7 @@ _PEISlam
                  tcd                    ; screen address to the direct page register
 
                  tsc
-                 sta   :stk_save        ; save the stack pointer to restore later
+                 stal  :stk_save        ; save the stack pointer to restore later
 
                  clc                    ; clear before the loop -- nothing in the loop affect the carry bit
                  brl   :outer           ; hop into the entry point.
@@ -57,7 +57,7 @@ _PEISlam
                  tdc                    ; Move to the next line
                  adc   #160
                  tcd
-                 adc   :screen_width_1
+                 adcl  :screen_width_1
                  tcs
 
                  dey                    ; decrement the total counter, if zero then we're done
@@ -79,7 +79,7 @@ _PEISlam
 :restore
                  tsx                    ; save the current stack
                  _R0W0                  ; restore the execution environment and
-                 lda   :stk_save        ; give a few cycles to catch some interrupts
+                 ldal  :stk_save        ; give a few cycles to catch some interrupts
                  tcs
                  cli                    ; fall through here -- saves a BRA instruction
 
@@ -92,7 +92,7 @@ _PEISlam
 
 :exit
                  _R0W0
-                 lda   :stk_save
+                 ldal  :stk_save
                  tcs
                  cli
 
diff --git a/src/blitter/Rotation.s b/src/blitter/Rotation.s
new file mode 100644
index 0000000..fed6a55
--- /dev/null
+++ b/src/blitter/Rotation.s
@@ -0,0 +1,220 @@
+; Support rotating the BG1 graphics by leveraging the fact that a rotation function can be decomposed
+; into an addition of two function parametertized by the angle of rotation: pixel = *(f(x, a) + f(y, a))
+;
+; The pre-build a number of rotation tables and then populate the direct page values and Y-register values
+; for each line of the blitter, such that a single lda (00),y instruction fetched the appropriate data
+; 
+; This is about as fast of a rotation as we can do.
+;
+; When possible, off-screen locations are calculate to produce an address of $FFFE, so that the last two bytes
+; of the BG1 data buffer provides the "fill value".
+
+ANGLEBNK                  ext
+_ApplyBG1XPosAngle
+;                          phy
+
+;                          lda   BG1StartX
+;                          jsr   Mod164
+;                          sta   BG1StartXMod164
+
+;                          lda   #162
+;                          sec
+;                          sbc   StartXMod164
+;                          bpl   *+6
+;                          clc
+;                          adc   #164
+;                          clc
+;                          adc   BG1StartXMod164
+;                          cmp   #164
+;                          bcc   *+5
+;                          sbc   #164
+
+;                          clc
+;                          adc   1,s
+;                          tay                             ; cache the value
+
+;                          pla                             ; pop the value
+                          phd                             ; save the direct page because we are going to switch to the
+                          lda   BlitterDP                 ; blitter direct page space and fill in the addresses
+                          tcd
+
+                          lda   #^ANGLEBNK
+                          sta   $fe
+                          sty   $fc                       ; Store in the new direct page
+                          ldy   #162
+                          tyx
+:loop
+                          lda   [$fc],y
+                          sta   00,x                      ; store the value
+                          dey
+                          dey
+                          dex
+                          dex
+                          bpl   :loop
+                          pld
+                          rts
+
+_ApplyBG1YPosAngle
+:virt_line                equ   tmp0
+:lines_left               equ   tmp1
+:draw_count               equ   tmp2
+:ytbl_idx                 equ   tmp3
+:angle_tbl                equ   tmp4
+
+                          sty   :angle_tbl
+
+                          lda   BG1StartY
+                          jsr   Mod208
+                          sta   BG1StartYMod208
+                          sta   :ytbl_idx                 ; Start copying from the first entry in the table
+
+                          lda   StartYMod208              ; This is the base line of the virtual screen
+                          sta   :virt_line                ; Keep track of it
+
+                          lda   ScreenHeight
+                          sta   :lines_left
+
+                          phb
+:loop
+                          lda   :virt_line
+                          asl
+                          tax
+                          ldal  BTableLow,x               ; Get the address of the first code field line
+                          tay
+
+                          sep   #$20
+                          ldal  BTableHigh,x
+                          pha                             ; push the bank on the stack
+                          plb
+                          rep   #$20
+
+                          lda   :virt_line
+                          and   #$000F
+                          eor   #$FFFF
+                          inc
+                          clc
+                          adc   #16
+                          min   :lines_left
+
+                          sta   :draw_count               ; Do this many lines
+                          asl
+                          tax
+
+                          lda   :ytbl_idx                 ; Read from this location (duplicate every 4 lines)
+                          lsr
+                          lsr
+                          asl
+                          clc
+                          adc   :angle_tbl
+                          sec
+                          sbc   #ANGLEBNK
+                          jsr   CopyAngleYTableToBG1Addr  ; or CopyBG1YTableToBG1Addr2
+
+                          lda   :virt_line                ; advance to the virtual line after the segment we just
+                          clc                             ; filled in
+                          adc   :draw_count
+                          sta   :virt_line
+
+                          lda   :ytbl_idx                 ; advance the index into the YTable
+                          adc   :draw_count
+                          sta   :ytbl_idx
+
+                          lda   :lines_left               ; subtract the number of lines we just completed
+                          sec
+                          sbc   :draw_count
+                          sta   :lines_left
+
+                          jne   :loop
+
+                          plb
+                          rts
+
+; Unrolled copy routine to move y_angle entries into BG1_ADDR position with an additional
+; shift.  This has to be split into two 
+;
+; A = index into the array (x2)
+; Y = starting line * $1000
+; X = number of lines (x2)
+CopyAngleYTableToBG1Addr
+                          phx
+                          phb
+
+                        
+                          jsr   _SetDataBank              ; restore access to this bank
+                          jsr   SaveBG1AngleValues
+
+                          plb
+                          plx                             ; x is used directly in this routine
+                          jmp   ApplyBG1OffsetValues
+
+SaveBG1AngleValues
+                          jmp   (:tbl,x)
+:tbl                      da    :none
+                          da    :do01,:do02,:do03,:do04
+                          da    :do05,:do06,:do07,:do08
+                          da    :do09,:do10,:do11,:do12
+                          da    :do13,:do14,:do15,:do16
+:do15                     tax
+                          bra   :x15
+:do14                     tax
+                          bra   :x14
+:do13                     tax
+                          bra   :x13
+:do12                     tax
+                          bra   :x12
+:do11                     tax
+                          bra   :x11
+:do10                     tax
+                          bra   :x10
+:do09                     tax
+                          bra   :x09
+:do08                     tax
+                          bra   :x08
+:do16                     tax
+                          ldal  ANGLEBNK+06,x
+                          sta   BG1YCache+30
+:x15                      ldal  ANGLEBNK+06,x
+                          sta   BG1YCache+28
+:x14                      ldal  ANGLEBNK+06,x
+                          sta   BG1YCache+26
+:x13                      ldal  ANGLEBNK+06,x
+                          sta   BG1YCache+24
+:x12                      ldal  ANGLEBNK+04,x
+                          sta   BG1YCache+22
+:x11                      ldal  ANGLEBNK+04,x
+                          sta   BG1YCache+20
+:x10                      ldal  ANGLEBNK+04,x
+                          sta   BG1YCache+18
+:x09                      ldal  ANGLEBNK+04,x
+                          sta   BG1YCache+16
+:x08                      ldal  ANGLEBNK+02,x
+                          sta   BG1YCache+14
+:x07                      ldal  ANGLEBNK+02,x
+                          sta   BG1YCache+12
+:x06                      ldal  ANGLEBNK+02,x
+                          sta   BG1YCache+10
+:x05                      ldal  ANGLEBNK+02,x
+                          sta   BG1YCache+08
+:x04                      ldal  ANGLEBNK+00,x
+                          sta   BG1YCache+06
+:x03                      ldal  ANGLEBNK+00,x
+                          sta   BG1YCache+04
+:x02                      ldal  ANGLEBNK+00,x
+                          sta   BG1YCache+02
+:x01                      ldal  ANGLEBNK+00,x
+                          sta   BG1YCache+00
+:none                     rts
+:do07                     tax
+                          bra   :x07
+:do06                     tax
+                          bra   :x06
+:do05                     tax
+                          bra   :x05
+:do04                     tax
+                          bra   :x04
+:do03                     tax
+                          bra   :x03
+:do02                     tax
+                          bra   :x02
+:do01                     tax
+                          bra   :x01
diff --git a/src/blitter/SCB.s b/src/blitter/SCB.s
index f60f3c9..6e48756 100644
--- a/src/blitter/SCB.s
+++ b/src/blitter/SCB.s
@@ -9,15 +9,7 @@
 ; on the SHR screen or the current value of StartY
 ;
 ; This could be made faster by forcing a SCB array to be copied into PEAs ahead of time, but this
-; is a bit more flexible            
-BltSCB      ENT
-            phb
-            phk
-            plb
-            jsr   _BltSCB
-            plb
-            rtl
-
+; is a bit more flexible
 _BltSCBOut
             rts
 _BltSCB
@@ -36,10 +28,10 @@ _BltSCB
 
             lda   SCBArrayPtr+2
             bpl   :bind_to_bg0
-            lda   BG1StartY
+            lda   BG1StartYMod208
             bra   :bind_to_bg1
 :bind_to_bg0 
-            lda   StartY
+            lda   StartYMod208
 :bind_to_bg1
             clc
             adc   SCBArrayPtr
@@ -52,7 +44,7 @@ _BltSCB
             inc
             clc
             adc   #:scb_end
-            sta   :entry+1
+            stal  :entry+1
 
             lda   ScreenY1       ; Get the SCB address to put into the stack register
             dec
@@ -82,13 +74,7 @@ _BltSCB
             plb                  ; restore the bank
             rts
 
-
-; Quick helper to set the pointer (X = low word, A = high work)
-SetSCBArray ENT
-        jsr   _SetSCBArray
-        rtl
-
-_SetSCBArray
+_BindSCBArray
         stx  SCBArrayPtr
         sta  SCBArrayPtr+2
         rts
diff --git a/src/blitter/Template.s b/src/blitter/Template.s
index ac7662b..332b534 100644
--- a/src/blitter/Template.s
+++ b/src/blitter/Template.s
@@ -42,7 +42,7 @@ PagePatches        da    {long_0-base+2}
 
 ]index             equ   0
                    lup   82                                 ; All the snippet addresses. The two JMP
-                   da    {snippets-base+{]index*32}+31}     ; instructino are at the end of each of
+                   da    {snippets-base+{]index*32}+31}     ; instructions are at the end of each of
                    da    {snippets-base+{]index*32}+28}     ; the 32-byte buffers
 ]index             equ   ]index+1
                    --^
@@ -58,538 +58,6 @@ BankPatches        da    {long_0-base+3}
                    da    {long_6-base+3}
 BankPatchNum       equ   *-BankPatches
 
-; Set the physical location of the virtual screen on the physical screen. The
-; screen size must by a multiple of 8
-;
-; A = XXYY where XX is the left edge [0, 159] and YY is the top edge [0, 199]
-; X = width (in bytes)
-; Y = height (in lines)
-;
-; This subroutine stores the screen positions in the direct page space and fills
-; in the double-length ScreenAddrR table that holds the address of the right edge
-; of the playfield.  This table is used to set addresses in the code banks when the
-; virtual origin is changed.
-;
-; We are not concerned about the raw performance of this function because it should
-; usually only be executed once during app initialization.  It doesn't get called
-; with any significant frequency.
-
-SetScreenRect      sty   ScreenHeight               ; Save the screen height and width
-                   stx   ScreenWidth
-
-                   tax                              ; Temp save of the accumulator
-                   and   #$00FF
-                   sta   ScreenY0
-                   clc
-                   adc   ScreenHeight
-                   sta   ScreenY1
-
-                   txa                              ; Restore the accumulator
-                   xba
-                   and   #$00FF
-                   sta   ScreenX0
-                   clc
-                   adc   ScreenWidth
-                   sta   ScreenX1
-
-                   lda   ScreenHeight               ; Divide the height in scanlines by 8 to get the number tiles
-                   lsr
-                   lsr
-                   lsr
-                   sta   ScreenTileHeight
-
-                   lda   ScreenWidth                ; Divide width in bytes by 4 to get the number of tiles
-                   lsr
-                   lsr
-                   sta   ScreenTileWidth
-
-                   lda   ScreenY0                   ; Calculate the address of the first byte
-                   asl                              ; of the right side of the playfield
-                   tax
-                   lda   ScreenAddr,x               ; This is the address for the left edge of the physical screen
-                   clc
-                   adc   ScreenX1
-                   dec
-                   pha                              ; Save for second loop
-
-                   ldx   #0
-                   ldy   ScreenHeight
-                   jsr   :loop
-                   pla                              ; Reset the address and continue filling in the
-                   ldy   ScreenHeight               ; second half of the table
-:loop              clc
-                   sta   RTable,x
-                   adc   #160
-                   inx
-                   inx
-                   dey
-                   bne   :loop
-
-; Calculate the screen locations for each tile corner
-
-                   lda   ScreenY0                   ; Calculate the address of the first byte
-                   asl                              ; of the right side of the playfield
-                   tax
-                   lda   ScreenAddr,x               ; This is the address for the left edge of the physical screen
-                   clc
-                   adc   ScreenX0
-
-                   ldx   #0
-                   ldy   #0
-:tsloop
-                   stal  TileStore+TS_SCREEN_ADDR,x
-
-                   clc
-                   adc   #4                         ; Go to the next tile
-
-                   iny
-                   cpy   #41                        ; If we've done 41 columns, move to the next line
-                   bcc   :nohop
-                   ldy   #0
-                   clc
-                   adc   #{8*160}-{4*41}
-:nohop
-
-                   inx
-                   inx
-                   cpx   #TILE_STORE_SIZE-2
-                   bcc   :tsloop
-
-; Return
-                   rts
-
-; Generalized routine that calculates the on-screen address of the tiles and takes the 
-; StartX and StartY values into consideration.  This routine really exists to support
-; the dirty tile rendering mode and the tiles *must* be aligned with the playfield.  
-; That is, StartX % 4 == 0 and StartY % 8 == 0.  If these conditions are not met, then
-; screen will not render correctly.
-_RecalcTileScreenAddrs
-NextColPtr         equ   tmp0
-RowAddrPtr         equ   tmp1
-OnScreenAddr       equ   tmp2
-Counter            equ   tmp3
-
-                   jsr   _OriginToTileStore          ; Get the (col,row) of the tile in the upper-left corner of the playfield
-
-; Manually add the offsets to the NextCol and TileStoreYTable array address and put in a direct page
-; location so we can free up the registers.
-
-                   clc
-                   txa
-                   adc   #NextCol
-                   sta   NextColPtr
-
-                   tya
-                   adc   #TileStoreYTable
-                   sta   RowAddrPtr
-
-; Calculate the on-screen address of the upper-left corner of the playfiled
-
-                   lda   ScreenY0                   ; Calculate the address of the first byte
-                   asl                              ; of the right side of the playfield
-                   tax
-                   lda   ScreenAddr,x               ; This is the address for the left edge of the physical screen
-                   clc
-                   adc   ScreenX0
-                   sta   OnScreenAddr
-
-; Now, loop through the tile store
-
-                   lda   #MAX_TILES
-                   sta   Counter
-                   ldy   #0
-:tsloop
-                   lda   (NextColPtr),y             ; Need to recalculate each time since the wrap-around could
-                   clc                              ; happen anywhere
-                   adc   (RowAddrPtr)               ;
-                   tax                              ; NOTE: Try to rework to use new TileStore2DLookup array
-
-                   lda   OnScreenAddr
-                   stal  TileStore+TS_SCREEN_ADDR,x
-
-                   clc
-                   adc   #4                         ; Go to the next tile
-
-                   iny
-                   iny
-                   cpy   #2*41                      ; If we've done 41 columns, move to the next line
-                   bcc   :nohop
-
-                   inc   RowAddrPtr                 ; Advance the row address (with wrap-around)
-                   inc   RowAddrPtr
-                   ldy   #0                         ; Reset the column counter
-                   clc
-                   adc   #{8*160}-{4*41}
-:nohop
-                   sta   OnScreenAddr               ; Save the updated on-screen address
-                   dec   Counter
-                   bne   :tsloop
-
-                   rts
-
-; Clear the SHR screen and then infill the defined field
-FillScreen         lda   #0
-                   jsr   _ClearToColor
-
-                   ldy   ScreenY0
-:yloop
-                   tya
-                   asl   a
-                   tax
-                   lda   ScreenAddr,x
-                   clc
-                   adc   ScreenX0
-                   tax
-                   phy
-
-                   lda   ScreenWidth
-                   lsr
-                   tay
-                   lda   #$FFFF
-:xloop             stal  $E10000,x                  ; X is the absolute address
-                   inx
-                   inx
-                   dey
-                   bne   :xloop
-
-                   ply
-                   iny
-                   cpy   ScreenY1
-                   bcc   :yloop
-                   rts
-
-; Special subroutine to divide the accumulator by 164 and return remainder in the Accumulator
-;
-; 164 = $A4 = 1010_0100
-Mod164             cmp   #%1010010000000000
-                   bcc   *+5
-                   sbc   #%1010010000000000
-
-                   cmp   #%0101001000000000
-                   bcc   *+5
-                   sbc   #%0101001000000000
-
-                   cmp   #%0010100100000000
-                   bcc   *+5
-                   sbc   #%0010100100000000
-
-                   cmp   #%0001010010000000
-                   bcc   *+5
-                   sbc   #%0001010010000000
-
-                   cmp   #%0000101001000000
-                   bcc   *+5
-                   sbc   #%0000101001000000
-
-                   cmp   #%0000010100100000
-                   bcc   *+5
-                   sbc   #%0000010100100000
-
-                   cmp   #%0000001010010000
-                   bcc   *+5
-                   sbc   #%0000001010010000
-
-                   cmp   #%0000000101001000
-                   bcc   *+5
-                   sbc   #%0000000101001000
-
-                   cmp   #%0000000010100100
-                   bcc   *+5
-                   sbc   #%0000000010100100
-                   rts
-
-; Special subroutine to divide the accumulator by 208 and return remainder in the Accumulator
-;
-; 208 = $D0 = 1101_0000
-;
-; There are probably faster hacks to divide a 16-bit unsigned value by 208
-;   https://www.drdobbs.com/parallel/optimizing-integer-division-by-a-constan/184408499
-;   https://embeddedgurus.com/stack-overflow/2009/06/division-of-integers-by-constants/
-
-Mod208             cmp   #%1101000000000000
-                   bcc   *+5
-                   sbc   #%1101000000000000
-
-                   cmp   #%0110100000000000
-                   bcc   *+5
-                   sbc   #%0110100000000000
-
-                   cmp   #%0011010000000000
-                   bcc   *+5
-                   sbc   #%0011010000000000
-
-                   cmp   #%0001101000000000
-                   bcc   *+5
-                   sbc   #%0001101000000000
-
-                   cmp   #%0000110100000000
-                   bcc   *+5
-                   sbc   #%0000110100000000
-
-                   cmp   #%0000011010000000
-                   bcc   *+5
-                   sbc   #%0000011010000000
-
-                   cmp   #%0000001101000000
-                   bcc   *+5
-                   sbc   #%0000001101000000
-
-                   cmp   #%0000000110100000
-                   bcc   *+5
-                   sbc   #%0000000110100000
-
-                   cmp   #%0000000011010000
-                   bcc   *+5
-                   sbc   #%0000000011010000
-                   rts
-
-; Patch an 8-bit or 16-bit valueS into the bank.  These are a set up unrolled loops to 
-; quickly patch in a constanct value, or a value from an array into a given set of 
-; templates.
-;
-; Because we have structured everything as parallel code blocks, most updates to the blitter
-; reduce to storing a constant value and have an amortized cost of just a single store.
-;
-; The utility of these routines is that they also handle setting just a range of lines
-; within a single bank.
-;
-; X = number of lines * 2, 0 to 32
-; Y = starting line * $1000
-; A = value
-;
-; Set M to 0 or 1
-SetConst                                            ; Need a blank line here, otherwise the :tbl local variable resolveds backwards
-                   jmp   (:tbl,x)
-:tbl               da    :bottom-00,:bottom-03,:bottom-06,:bottom-09
-                   da    :bottom-12,:bottom-15,:bottom-18,:bottom-21
-                   da    :bottom-24,:bottom-27,:bottom-30,:bottom-33
-                   da    :bottom-36,:bottom-39,:bottom-42,:bottom-45
-                   da    :bottom-48
-:top               sta   $F000,y
-                   sta   $E000,y
-                   sta   $D000,y
-                   sta   $C000,y
-                   sta   $B000,y
-                   sta   $A000,y
-                   sta   $9000,y
-                   sta   $8000,y
-                   sta   $7000,y
-                   sta   $6000,y
-                   sta   $5000,y
-                   sta   $4000,y
-                   sta   $3000,y
-                   sta   $2000,y
-                   sta   $1000,y
-                   sta:  $0000,y
-:bottom            rts
-
-; SetDPAddrs
-;
-; A = absolute address (largest)
-; Y = offset
-;
-; Initializes a bank of direct page offsets
-SetDPAddrs
-                   lda   #$0800
-                   sta   $F000,y
-                   lda   #$0700
-                   sta   $E000,y
-                   lda   #$0600
-                   sta   $D000,y
-                   lda   #$0500
-                   sta   $C000,y
-                   lda   #$0400
-                   sta   $B000,y
-                   lda   #$0300
-                   sta   $A000,y
-                   lda   #$0200
-                   sta   $9000,y
-                   lda   #$0100
-                   sta:  $8000,y
-
-                   lda   #$0800
-                   sta   $7000,y
-                   lda   #$0700
-                   sta   $6000,y
-                   lda   #$0600
-                   sta   $5000,y
-                   lda   #$0500
-                   sta   $4000,y
-                   lda   #$0400
-                   sta   $3000,y
-                   lda   #$0300
-                   sta   $2000,y
-                   lda   #$0200
-                   sta   $1000,y
-                   lda   #$0100
-                   sta:  $0000,y
-                   rts
-
-; SetAbsAddrs
-;
-; A = absolute address (largest)
-; Y = offset
-; X = number of lines
-;
-; Stores a value and decrements by $1000 for each line
-SetAbsAddrs        sec
-                   jmp   (:tbl,x)
-:tbl               da    :bottom-00,:bottom-03,:bottom-09,:bottom-15
-                   da    :bottom-21,:bottom-27,:bottom-33,:bottom-39
-                   da    :bottom-45,:bottom-51,:bottom-57,:bottom-63
-                   da    :bottom-69,:bottom-75,:bottom-81,:bottom-87
-                   da    :bottom-93
-:top               sta   $F000,y
-                   sbc   #$1000
-                   sta   $E000,y
-                   sbc   #$1000
-                   sta   $D000,y
-                   sbc   #$1000
-                   sta   $C000,y
-                   sbc   #$1000
-                   sta   $B000,y
-                   sbc   #$1000
-                   sta   $A000,y
-                   sbc   #$1000
-                   sta   $9000,y
-                   sbc   #$1000
-                   sta   $8000,y
-                   sbc   #$1000
-                   sta   $7000,y
-                   sbc   #$1000
-                   sta   $6000,y
-                   sbc   #$1000
-                   sta   $5000,y
-                   sbc   #$1000
-                   sta   $4000,y
-                   sbc   #$1000
-                   sta   $3000,y
-                   sbc   #$1000
-                   sta   $2000,y
-                   sbc   #$1000
-                   sta   $1000,y
-                   sbc   #$1000
-                   sta:  $0000,y
-:bottom            rts
-
-; Fill up a full bank with blitter templates.  Currently we can fit 16 lines per bank, so need
-; a total of 13 banks to hold the 208 lines for full-screen support
-;
-; A = high word of bank table
-; Y = index * 4 of the bank to initialize
-BuildBank
-
-:bankArray         equ   tmp0
-:target            equ   tmp2
-:nextBank          equ   tmp4
-
-                   stx   :bankArray
-                   sta   :bankArray+2
-
-                   stz   :target
-                   iny
-                   iny
-                   lda   [:bankArray],y
-                   sta   :target+2
-
-                   iny                              ; move to the next item
-                   iny
-                   iny                              ; middle byte
-                   cpy   #4*13                      ; if greater than the array length, wrap back to zero
-                   bcc   :ok
-                   ldy   #1
-:ok                lda   [:bankArray],y             ; Get the middle and high bytes of the address
-                   sta   :nextBank
-
-:next
-                   jsr   :BuildLine2
-                   lda   :target
-                   clc
-                   adc   #$1000
-                   sta   :target
-                   bcc   :next
-
-                   phb
-                   pei   :target+1
-                   plb
-                   plb
-
-; Change the patched value to one of DP_ENTRY, TWO_LYR_ENTRY or ONE_LYR_ENTRY based on the capabilities
-; that the engine needs.
-
-                   lda   #$F000+{DP_ENTRY}          ; Set the address from each line to the next
-                   ldy   #CODE_EXIT+1
-                   ldx   #15*2
-                   jsr   SetAbsAddrs
-
-                   ldy   #DP_ADDR
-                   jsr   SetDPAddrs
-
-                   ldy   #$F000+CODE_EXIT           ; Patch the last line with a JML to go to the next bank
-                   lda   #{$005C+{DP_ENTRY}*256}
-                   sta   [:target],y
-                   ldy   #$F000+CODE_EXIT+2
-                   lda   :nextBank
-                   sta   [:target],y
-
-                   ldy   #$8000+CODE_EXIT           ; Patch one line per bank to enable interrupts
-                   lda   #{$004C+{ENABLE_INT}*256}
-                   sta   [:target],y
-
-                   plb
-                   rts
-
-; This is the relocation subroutine, it is responsible for copying the template to a
-; memory location and patching up the necessary instructions.
-;
-; X = low word of address (must be a multiple of $1000)
-; A = high word of address (bank)
-:BuildLine
-                   stx   :target
-                   sta   :target+2
-
-:BuildLine2
-                   lda   #CODE_LEN                  ; round up to an even number of bytes
-                   inc
-                   and   #$FFFE
-                   beq   :nocopy
-                   dec
-                   dec
-                   tay
-:loop              lda   base,y
-                   sta   [:target],y
-
-                   dey
-                   dey
-                   bpl   :loop
-
-:nocopy            lda   #0                         ; copy is complete, now patch up the addresses
-                   sep   #$20
-
-                   ldx   #0
-                   lda   :target+2                  ; patch in the bank for the absolute long addressing mode
-:dobank            ldy   BankPatches,x
-                   sta   [:target],y
-                   inx
-                   inx
-                   cpx   #BankPatchNum
-                   bcc   :dobank
-
-                   ldx   #0
-:dopage            ldy   PagePatches,x              ; patch the page addresses by adding the page offset to each
-                   lda   [:target],y
-                   clc
-                   adc   :target+1
-                   sta   [:target],y
-                   inx
-                   inx
-                   cpx   #PagePatchNum
-                   bcc   :dopage
-
-:out
-                   rep   #$20
-                   rts
-
 ; Start of the template code.  This code is replicated 16 times per bank and spans
 ; 13 banks for a total of 208 lines, which is what is required to render 26 tiles
 ; to cover the full screen vertical scrolling.
diff --git a/src/blitter/TemplateUtils.s b/src/blitter/TemplateUtils.s
new file mode 100644
index 0000000..9f29eed
--- /dev/null
+++ b/src/blitter/TemplateUtils.s
@@ -0,0 +1,336 @@
+; Untility function related to patching and manipulating the blitter template code
+
+                   mx    %00
+
+; Generalized routine that calculates the on-screen address of the tiles and takes the 
+; StartX and StartY values into consideration.  This routine really exists to support
+; the dirty tile rendering mode and the tiles *must* be aligned with the playfield.
+; That is, StartX % 4 == 0 and StartY % 8 == 0.  If these conditions are not met, then
+; screen will not render correctly.
+_RecalcTileScreenAddrs
+NextColPtr         equ   tmp0
+RowAddrPtr         equ   tmp1
+OnScreenAddr       equ   tmp2
+Counter            equ   tmp3
+
+                   jsr   _OriginToTileStore          ; Get the (col,row) of the tile in the upper-left corner of the playfield
+
+; Manually add the offsets to the NextCol and TileStoreYTable array address and put in a direct page
+; location so we can free up the registers.
+
+                   clc
+                   txa
+                   adc   #NextCol
+                   sta   NextColPtr
+
+                   tya
+                   adc   #TileStoreYTable
+                   sta   RowAddrPtr
+
+; Calculate the on-screen address of the upper-left corner of the playfiled
+
+                   lda   ScreenY0                   ; Calculate the address of the first byte
+                   asl                              ; of the right side of the playfield
+                   tax
+                   lda   ScreenAddr,x               ; This is the address for the left edge of the physical screen
+                   clc
+                   adc   ScreenX0
+                   sta   OnScreenAddr
+
+; Now, loop through the tile store
+
+                   lda   #MAX_TILES
+                   sta   Counter
+                   ldy   #0
+:tsloop
+                   lda   (NextColPtr),y             ; Need to recalculate each time since the wrap-around could
+                   clc                              ; happen anywhere
+                   adc   (RowAddrPtr)               ;
+                   tax                              ; NOTE: Try to rework to use new TileStore2DLookup array
+
+                   lda   OnScreenAddr
+                   sta  TileStore+TS_SCREEN_ADDR,x
+
+                   clc
+                   adc   #4                         ; Go to the next tile
+
+                   iny
+                   iny
+                   cpy   #2*41                      ; If we've done 41 columns, move to the next line
+                   bcc   :nohop
+
+                   inc   RowAddrPtr                 ; Advance the row address (with wrap-around)
+                   inc   RowAddrPtr
+                   ldy   #0                         ; Reset the column counter
+                   clc
+                   adc   #{8*160}-{4*41}
+:nohop
+                   sta   OnScreenAddr               ; Save the updated on-screen address
+                   dec   Counter
+                   bne   :tsloop
+
+                   rts
+
+
+; Patch an 8-bit or 16-bit valueS into the bank.  These are a set up unrolled loops to 
+; quickly patch in a constant value, or a value from an array into a given set of 
+; templates.
+;
+; Because we have structured everything as parallel code blocks, most updates to the blitter
+; reduce to storing a constant value and have an amortized cost of just a single store.
+;
+; The utility of these routines is that they also handle setting just a range of lines
+; within a single bank.
+;
+; X = number of lines * 2, 0 to 32
+; Y = starting line * $1000
+; A = value
+;
+; Set M to 0 or 1
+SetConst                                            ; Need a blank line here, otherwise the :tbl local variable resolveds backwards
+                   jmp   (:tbl,x)
+:tbl               da    :bottom-00,:bottom-03,:bottom-06,:bottom-09
+                   da    :bottom-12,:bottom-15,:bottom-18,:bottom-21
+                   da    :bottom-24,:bottom-27,:bottom-30,:bottom-33
+                   da    :bottom-36,:bottom-39,:bottom-42,:bottom-45
+                   da    :bottom-48
+:top               sta   $F000,y
+                   sta   $E000,y
+                   sta   $D000,y
+                   sta   $C000,y
+                   sta   $B000,y
+                   sta   $A000,y
+                   sta   $9000,y
+                   sta   $8000,y
+                   sta   $7000,y
+                   sta   $6000,y
+                   sta   $5000,y
+                   sta   $4000,y
+                   sta   $3000,y
+                   sta   $2000,y
+                   sta   $1000,y
+                   sta:  $0000,y
+:bottom            rts
+
+; SetDPAddrs
+;
+; A = absolute address (largest)
+; Y = offset
+;
+; Initializes a bank of direct page offsets
+SetDPAddrs
+                   lda   #$0800
+                   sta   $F000,y
+                   lda   #$0700
+                   sta   $E000,y
+                   lda   #$0600
+                   sta   $D000,y
+                   lda   #$0500
+                   sta   $C000,y
+                   lda   #$0400
+                   sta   $B000,y
+                   lda   #$0300
+                   sta   $A000,y
+                   lda   #$0200
+                   sta   $9000,y
+                   lda   #$0100
+                   sta:  $8000,y
+
+                   lda   #$0800
+                   sta   $7000,y
+                   lda   #$0700
+                   sta   $6000,y
+                   lda   #$0600
+                   sta   $5000,y
+                   lda   #$0500
+                   sta   $4000,y
+                   lda   #$0400
+                   sta   $3000,y
+                   lda   #$0300
+                   sta   $2000,y
+                   lda   #$0200
+                   sta   $1000,y
+                   lda   #$0100
+                   sta:  $0000,y
+                   rts
+
+; SetAbsAddrs
+;
+; A = absolute address (largest)
+; Y = offset
+; X = number of lines
+;
+; Stores a value and decrements by $1000 for each line
+SetAbsAddrs        sec
+                   jmp   (:tbl,x)
+:tbl               da    :bottom-00,:bottom-03,:bottom-09,:bottom-15
+                   da    :bottom-21,:bottom-27,:bottom-33,:bottom-39
+                   da    :bottom-45,:bottom-51,:bottom-57,:bottom-63
+                   da    :bottom-69,:bottom-75,:bottom-81,:bottom-87
+                   da    :bottom-93
+:top               sta   $F000,y
+                   sbc   #$1000
+                   sta   $E000,y
+                   sbc   #$1000
+                   sta   $D000,y
+                   sbc   #$1000
+                   sta   $C000,y
+                   sbc   #$1000
+                   sta   $B000,y
+                   sbc   #$1000
+                   sta   $A000,y
+                   sbc   #$1000
+                   sta   $9000,y
+                   sbc   #$1000
+                   sta   $8000,y
+                   sbc   #$1000
+                   sta   $7000,y
+                   sbc   #$1000
+                   sta   $6000,y
+                   sbc   #$1000
+                   sta   $5000,y
+                   sbc   #$1000
+                   sta   $4000,y
+                   sbc   #$1000
+                   sta   $3000,y
+                   sbc   #$1000
+                   sta   $2000,y
+                   sbc   #$1000
+                   sta   $1000,y
+                   sbc   #$1000
+                   sta:  $0000,y
+:bottom            rts
+
+; Fill up a full bank with blitter templates.  Currently we can fit 16 lines per bank, so need
+; a total of 13 banks to hold the 208 lines for full-screen support
+;
+; A = high word of bank table
+; Y = index * 4 of the bank to initialize
+BuildBank
+
+:bankArray         equ   tmp0
+:target            equ   tmp2
+:nextBank          equ   tmp4
+:entryOffset       equ   tmp6
+
+                   stx   :bankArray
+                   sta   :bankArray+2
+
+                   stz   :target
+                   iny
+                   iny
+                   lda   [:bankArray],y
+                   sta   :target+2
+
+                   iny                              ; move to the next item
+                   iny
+                   iny                              ; middle byte
+                   cpy   #4*13                      ; if greater than the array length, wrap back to zero
+                   bcc   :ok
+                   ldy   #1
+:ok                lda   [:bankArray],y             ; Get the middle and high bytes of the address
+                   sta   :nextBank
+
+:next
+                   jsr   :BuildLine2
+                   lda   :target
+                   clc
+                   adc   #$1000
+                   sta   :target
+                   bcc   :next
+
+                   phb
+                   pei   :target+1
+                   plb
+                   plb
+
+; Change the patched value to one of DP_ENTRY, TWO_LYR_ENTRY or ONE_LYR_ENTRY based on the capabilities
+; that the engine needs.
+
+                   lda   #DP_ENTRY
+                   sta   :entryOffset
+                   lda   EngineMode
+                   bne   :not_simple
+                   lda   #ONE_LYR_ENTRY
+                   sta   :entryOffset
+:not_simple
+
+                   lda   #$F000                        ; Set the address from each line to the next
+                   ora   :entryOffset
+                   ldy   #CODE_EXIT+1
+                   ldx   #15*2
+                   jsr   SetAbsAddrs
+
+                   ldy   #DP_ADDR
+                   jsr   SetDPAddrs
+
+                   ldy   #$F000+CODE_EXIT           ; Patch the last line with a JML to go to the next bank
+                   lda   :entryOffset
+                   xba
+                   ora   #$005C
+                   sta   [:target],y
+                   ldy   #$F000+CODE_EXIT+2
+                   lda   :nextBank
+                   sta   [:target],y
+
+                   ldy   #$8000+CODE_EXIT           ; Patch one line per bank to enable interrupts
+                   lda   #{$004C+{ENABLE_INT}*256}
+                   sta   [:target],y
+
+                   plb
+                   rts
+
+; This is the relocation subroutine, it is responsible for copying the template to a
+; memory location and patching up the necessary instructions.
+;
+; X = low word of address (must be a multiple of $1000)
+; A = high word of address (bank)
+:BuildLine
+                   stx   :target
+                   sta   :target+2
+
+:BuildLine2
+                   phb                              ; save bank and reset to the code bank because
+                   phk                              ; the template is part of this bank
+                   plb
+
+                   lda   #CODE_LEN                  ; round up to an even number of bytes
+                   inc
+                   and   #$FFFE
+                   beq   :nocopy
+                   dec
+                   dec
+                   tay
+:loop              lda   base,y
+                   sta   [:target],y
+
+                   dey
+                   dey
+                   bpl   :loop
+
+:nocopy            lda   #0                         ; copy is complete, now patch up the addresses
+                   sep   #$20
+
+                   ldx   #0
+                   lda   :target+2                  ; patch in the bank for the absolute long addressing mode
+:dobank            ldy   BankPatches,x
+                   sta   [:target],y
+                   inx
+                   inx
+                   cpx   #BankPatchNum
+                   bcc   :dobank
+
+                   ldx   #0
+:dopage            ldy   PagePatches,x              ; patch the page addresses by adding the page offset to each
+                   lda   [:target],y
+                   clc
+                   adc   :target+1
+                   sta   [:target],y
+                   inx
+                   inx
+                   cpx   #PagePatchNum
+                   bcc   :dopage
+
+                   rep   #$20
+                   plb
+                   rts
\ No newline at end of file
diff --git a/src/blitter/TileProcs.s b/src/blitter/TileProcs.s
new file mode 100644
index 0000000..b5c77db
--- /dev/null
+++ b/src/blitter/TileProcs.s
@@ -0,0 +1,121 @@
+; A simple helper function that fills in all of the opcodes of a tile with the PEA opcode.  This is
+; a separate functino because we can often just update the tile data if we know the opcodes are already
+; set.  When we have to fill the opcodes, this function is used
+_TBFillPEAOpcode
+                 sep             #$20
+                 lda             #$F4
+]line            equ   0
+                 lup   8
+                 sta:            $0000+{]line*$1000},y
+                 sta:            $0003+{]line*$1000},y
+]line            equ   ]line+1
+                 --^
+                 rep             #$20
+                 rts
+
+; Copy tile data into the direct page compositing buffer.  The main reason to do this in full passes is
+; because we can avoid needing to use both the X and Y registers during the compositing process and
+; reserve Y to hold the code field address.
+;
+; Also, we can get away with not setting the bank register, this is a wash in terms of speed, but results
+; in simpler, more composable subroutines
+_TBCopyTileDataAndMaskToCBuff
+                 jsr   _TBCopyTileDataToCBuff
+                 jmp   _TBCopyTileMaskToCBuff
+
+_TBCopyTileDataAndMaskToCBuffV
+                 jsr   _TBCopyTileDataToCBuffV
+                 jmp   _TBCopyTileMaskToCBuffV
+
+_TBCopyTileDataToCBuff
+]line            equ   0
+                 lup   8
+                 ldal  tiledata+{]line*4},x
+                 sta   blttmp+{]line*4}
+
+                 ldal  tiledata+{]line*4}+2,x
+                 sta   blttmp+{]line*4}+2
+]line            equ   ]line+1
+                 --^
+                 rts
+
+_TBCopyTileDataToCBuffV
+]src             equ   7
+]dest            equ   0
+                 lup   8
+                 ldal  tiledata+{]src*4},x
+                 sta   blttmp+{]dest*4}
+
+                 ldal  tiledata+{]src*4}+2,x
+                 sta   blttmp+{]dest*4}+2
+]src             equ   ]src-1
+]dest            equ   ]dest+1
+                 --^
+                 rts
+
+; Copy tile mask data into the direct page compositing buffer.
+_TBCopyTileMaskToCBuff
+]line            equ   0
+                 lup   8
+                 ldal  tiledata+{]line*4}+32,x
+                 sta   blttmp+{]line*4}+32
+
+                 ldal  tiledata+{]line*4}+32+2,x
+                 sta   blttmp+{]line*4}+32+2
+]line            equ   ]line+1
+                 --^
+                 rts
+
+_TBCopyTileMaskToCBuffV
+]src             equ   7
+]dest            equ   0
+                 lup   8
+                 ldal  tiledata+{]src*4}+32,x
+                 sta  blttmp+{]dest*4}+32
+
+                 ldal  tiledata+{]src*4}+32+2,x
+                 sta   blttmp+{]dest*4}+32+2
+]src             equ   ]src-1
+]dest            equ   ]dest+1
+                 --^
+                 rts
+
+; Tile 0 specializations
+; _TBConstTile
+;
+; A specialized routine that fills in a tile with a single constant value.  It's intended to be used to
+; fill in solid colors, so there are no specialized horizontal or verical flipped variants
+_TBConstTileX
+                 lda             #0
+                 sta:            $0001,y
+                 sta:            $0004,y
+                 sta             $1001,y
+                 sta             $1004,y
+                 sta             $2001,y
+                 sta             $2004,y
+                 sta             $3001,y
+                 sta             $3004,y
+                 sta             $4001,y
+                 sta             $4004,y
+                 sta             $5001,y
+                 sta             $5004,y
+                 sta             $6001,y
+                 sta             $6004,y
+                 sta             $7001,y
+                 sta             $7004,y
+                 plb
+                 rts
+
+_TBConstTileSlow0
+                 tax
+                 jsr    _TBFillPEAOpcode
+                 jmp    _TBConstTileX
+
+_TBConstTileDataToDP2
+]line            equ   0
+                 lup   8
+                 stz   tmp_tile_data+{]line*4}
+                 stz   tmp_tile_data+{]line*4}+2
+]line            equ   ]line+1
+                 --^
+                 rts
diff --git a/src/blitter/Tiles.s b/src/blitter/Tiles.s
index ba76c3f..8a7adf4 100644
--- a/src/blitter/Tiles.s
+++ b/src/blitter/Tiles.s
@@ -37,132 +37,45 @@
 ;
 ; It is simply too slow to try to horizontally reverse the pixel data on the fly.  This still allows
 ; for up to 512 tiles to be stored in a single bank, which should be sufficient.
-
-TILE_CTRL_MASK    equ             $FE00
-TILE_PROC_MASK    equ             $F800                  ; Select tile proc for rendering
-
-; Temporary direct page locatinos used by some of the complex tile renderers
-
-_X_REG           equ             tiletmp
-_Y_REG           equ             tiletmp+2
-_T_PTR           equ             tiletmp+4                         ; Copy of the tile address pointer
-_BASE_ADDR       equ             tiletmp+6                         ; Copy of BTableLow for this tile
-_SPR_X_REG       equ             tiletmp+8                         ; Cache address of sprite plane source for a tile
-_JTBL_CACHE      equ             tiletmp+10                        ; Cache the offset to the exception handler for a column
-_OP_CACHE        equ             tiletmp+12                        ; Cache of a relevant operand / oeprator
-_TILE_ID         equ             tiletmp+14                        ; Copy of the tile descriptor
-
-; Low-level function to take a tile descriptor and return the address in the tiledata
-; bank.  This is not too useful in the fast-path because the fast-path does more
-; incremental calculations, but it is handy for other utility functions
 ;
-; A = tile descriptor
-;
-; The address is the TileID * 128 + (HFLIP * 64)
-GetTileAddr      ENT
-                 jsr             _GetTileAddr
-                 rtl
-_GetTileAddr
-                 asl                                               ; Multiply by 2
-                 bit             #2*TILE_HFLIP_BIT                 ; Check if the horizontal flip bit is set
-                 beq             :no_flip
-                 inc                                               ; Set the LSB
-:no_flip         asl                                               ; x4
-                 asl                                               ; x8
-                 asl                                               ; x16
-                 asl                                               ; x32
-                 asl                                               ; x64
-                 asl                                               ; x128
-                 rts
-
-; Ignore the horizontal flip bit
-_GetBaseTileAddr
-                 asl                                               ; Multiply by 2
-                 asl                                               ; x4
-                 asl                                               ; x8
-                 asl                                               ; x16
-                 asl                                               ; x32
-                 asl                                               ; x64
-                 asl                                               ; x128
-                 rts
-
-; On entry
-;
-; B is set to the correct BG1 data bank
-; A is set to the the tile descriptor
-; Y is set to the top-left address of the tile in the BG1 data bank
-;
-; tmp0/tmp1 is reserved 
-_RenderTileBG1
-                 pha                                               ; Save the tile descriptor
-
-                 and             #TILE_VFLIP_BIT+TILE_HFLIP_BIT    ; Only horizontal and vertical flips are supported for BG1
-                 xba
-                 tax
-                 ldal            :actions,x
-                 stal            :tiledisp+1
-
-                 pla
-                 and             #TILE_ID_MASK                     ; Mask out the ID and save just that
-                 _Mul128                                           ; multiplied by 128
-                 tax
-:tiledisp        jmp             $0000
-
-:actions         dw              _TBSolidBG1_00,_TBSolidBG1_0H,_TBSolidBG1_V0,_TBSolidBG1_VH
-
 ; Given an address to a Tile Store record, dispatch to the appropriate tile renderer.  The Tile
 ; Store record contains all of the low-level information that's needed to call the renderer.
 ;
-; Y = address of tile
+; There are two execution paths that are handled here.  First, if there is no sprite, then
+; the tile data is read directly and written into the code field in a single pass. If there
+; are sprites that overlap the tile, then the sprite data is combined with the tile data
+; and written to a temporary direct page buffer.  If 
+;
+; This routine sets the direct page register to the second page since we use that space to 
+; build and cache tile and sprite data, when necessary
+
 _RenderTile2
-                 pea   >TileStore                     ; Need that addressing flexibility here.  Caller is responsible for restoring bank reg
-                 plb
-                 plb
-                 txy                                  ; We can be better than this....
+                 lda   TileStore+TS_SPRITE_FLAG,x     ; This is a bitfield of all the sprites that intersect this tile, only care if non-zero or not
+                 bne   do_dirty_sprite
 
-                 lda   TileStore+TS_TILE_ID,y         ; build the finalized tile descriptor
-                 ldx   TileStore+TS_SPRITE_FLAG,y     ; This is a bitfield of all the sprites that intersect this tile, only care if non-zero or not
-                 beq   :nosprite
+; Handle the non-sprite tile blit
+CopyNoSprites
+                 sep   #$20
+                 lda   TileStore+TS_CODE_ADDR_HIGH,x  ; load the bank of the target code field line
+                 pha                                  ; and put on the stack for later
 
-;                 txa
-;                 jsr   BuildActiveSpriteArray         ; Build the max 4 array of active sprites for this tile
-;                 sta   ActiveSpriteCount
+;                 lda   TileStore+TS_BASE_ADDR+1,x     ; load the base address of the code field ($0000 or $8000)
+;                 sta   _BASE_ADDR+1                   ; so we can get by just copying the high byte
+                 rep   #$20
 
-                 lda   TileStore+TS_VBUFF_ARRAY_ADDR,y ; Scratch space
-                 sta   _SPR_X_REG
-                 phy
-                 ldy   spriteIdx
-                 lda   (_SPR_X_REG),y
-                 sta   _SPR_X_REG
-                 ply
-
-                 lda   TileStore+TS_TILE_ID,y
-                 ora   #TILE_SPRITE_BIT
-;                 ldx   TileStore+TS_VBUFF_ARRAY_ADDR,y
-;                 stx   _SPR_X_REG
-
-:nosprite
-                 sta   _TILE_ID                       ; Some tile blitters need to get the tile descriptor
-                 and   #TILE_CTRL_MASK
-                 xba
-                 tax
-                 ldal  TileProcs,x                    ; load and patch in the appropriate subroutine
+                 lda   TileStore+TS_BASE_TILE_DISP,x  ; Get the address of the renderer for this tile
                  stal  :tiledisp+1
 
-                 ldx   TileStore+TS_TILE_ADDR,y       ; load the address of this tile's data (pre-calculated)
+                 lda   TileStore+TS_TILE_ID,x
+                 sta   _TILE_ID                       ; Some tile blitters need to get the tile descriptor
 
-                 sep   #$20                           ; load the bank of the target code field line
-                 lda   TileStore+TS_CODE_ADDR_HIGH,y
+                 ldy   TileStore+TS_CODE_ADDR_LOW,x   ; load the address of the code field
+                 lda   TileStore+TS_TILE_ADDR,x       ; load the address of this tile's data (pre-calculated)
                  pha
-                 rep   #$20
-                 lda   TileStore+TS_CODE_ADDR_LOW,y   ; load the address of the code field
-                 pha
-                 lda   TileStore+TS_BASE_ADDR,y       ; load the base address of the code field
-                 sta   _BASE_ADDR
 
-                 lda   TileStore+TS_WORD_OFFSET,y
-                 ply
-                 plb                                  ; set the bank
+                 lda   TileStore+TS_WORD_OFFSET,x
+                 plx
+                 plb                                  ; set the bank to the code field that will be updated
 
 ; B is set to the correct code field bank
 ; A is set to the tile word offset (0 through 80 in steps of 4)
@@ -171,6 +84,147 @@ _RenderTile2
 
 :tiledisp        jmp   $0000                          ; render the tile
 
+; The sprite code is just responsible for quickly copying all of the sprite data
+; into the direct page temp area.
+
+do_dirty_sprite
+                 pei   TileStoreBankAndTileDataBank   ; Special value that has the TileStore bank in LSB and TileData bank in MSB
+                 plb
+
+; Cache a couple of values into the direct page that are used across all copy routines
+
+                 lda   TileStore+TS_TILE_ADDR,y       ; load the address of this tile's data (pre-calculated)
+                 sta   tileAddr
+
+                 ldx   TileStore+TS_VBUFF_ADDR_COUNT,y
+                 jmp   (dirty_sprite_dispatch,x)
+dirty_sprite_dispatch
+                 da    CopyNoSprites
+                 da    CopyOneSprite
+                 da    CopyTwoSprites
+                 da    CopyThreeSprites
+                 da    CopyFourSprites                     ; MAX, don't bother with more than 4 sprites per tile
+
+; We can optimize later, for now just copy the sprite data and mask into its own
+; direct page buffer and combine with the tile data later
+;
+; We set up direct page pointers to the mask bank and use the bank register for the
+; data.
+CopyFourSprites
+                 lda   TileStore+TS_VBUFF_ADDR_0,y
+                 sta   spriteIdx
+                 lda   TileStore+TS_VBUFF_ADDR_1,y
+                 sta   spriteIdx+4
+                 lda   TileStore+TS_VBUFF_ADDR_2,y
+                 sta   spriteIdx+8
+                 lda   TileStore+TS_VBUFF_ADDR_3,y
+                 sta   spriteIdx+12
+
+; Copy three sprites into a temporary direct page buffer
+LDA_IL           equ   $A7    ; lda [dp]
+LDA_ILY          equ   $B7    ; lda [dp],y
+AND_IL           equ   $27    ; and [dp]
+AND_ILY          equ   $37    ; and [dp],y
+
+CopyThreeSprites
+                 lda   TileStore+TS_VBUFF_ADDR_0,y
+                 sta   spriteIdx
+                 lda   TileStore+TS_VBUFF_ADDR_1,y
+                 sta   spriteIdx+4
+                 lda   TileStore+TS_VBUFF_ADDR_2,y
+                 sta   spriteIdx+8
+
+]line            equ   0
+                 lup   8
+                 ldy   #]line*SPRITE_PLANE_SPAN
+                 lda   (spriteIdx+8),y
+                 db    AND_ILY,spriteIdx+4            ; Can't use long indirect inside LUP because of ']'
+                 ora   (spriteIdx+4),y
+                 db    AND_ILY,spriteIdx+0
+                 ora   (spriteIdx+0),y
+                 sta   tmp_sprite_data+{]line*4}
+
+                 db    LDA_ILY,spriteIdx+8
+                 db    AND_ILY,spriteIdx+4
+                 db    AND_ILY,spriteIdx+0
+                 sta   tmp_sprite_mask+{]line*4}
+
+                 ldy   #]line*SPRITE_PLANE_SPAN+2
+                 lda   (spriteIdx+8),y
+                 db    AND_ILY,spriteIdx+4 
+                 ora   (spriteIdx+4),y
+                 db    AND_ILY,spriteIdx+0
+                 ora   (spriteIdx+0),y
+                 sta   tmp_sprite_data+{]line*4}+2
+
+                 db    LDA_ILY,spriteIdx+8
+                 db    AND_ILY,spriteIdx+4
+                 db    AND_ILY,spriteIdx+0
+                 sta   tmp_sprite_mask+{]line*4}+2
+]line            equ   ]line+1
+                 --^
+;                 jmp   FinishTile
+
+; Copy two sprites into a temporary direct page buffer
+CopyTwoSprites
+                 lda   TileStore+TS_VBUFF_ADDR_0,y
+                 sta   spriteIdx
+                 lda   TileStore+TS_VBUFF_ADDR_1,y
+                 sta   spriteIdx+4
+
+]line            equ   0
+                 lup   8
+                 ldy   #]line*SPRITE_PLANE_SPAN
+                 lda   (spriteIdx+4),y
+                 db    AND_ILY,spriteIdx+0
+                 ora   (spriteIdx+0),y
+                 sta   tmp_sprite_data+{]line*4}
+
+                 db    LDA_ILY,spriteIdx+4
+                 db    AND_ILY,spriteIdx+0
+                 sta   tmp_sprite_mask+{]line*4}
+
+                 ldy   #]line*SPRITE_PLANE_SPAN+2
+                 lda   (spriteIdx+4),y
+                 db    AND_ILY,spriteIdx+0
+                 ora   (spriteIdx+0),y
+                 sta   tmp_sprite_data+{]line*4}+2
+
+                 db    LDA_ILY,spriteIdx+4
+                 db    AND_ILY,spriteIdx+0
+                 sta   tmp_sprite_mask+{]line*4}+2
+]line            equ   ]line+1
+                 --^
+;                 jmp   FinishTile
+
+CopyOneSprite
+                 clc
+                 lda   TileStore+TS_VBUFF_ADDR_0,y
+                 sta   spriteIdx
+                 adc   #2
+                 sta   spriteIdx+4
+
+]line            equ   0
+                 lup   8
+;                 ldal  tiledata,x
+;                 and   [spriteIdx]
+;                 ora   (spriteIdx)
+;                 sta   tmp_sprite_data+{]line*4}
+
+                 ldal  spritedata+{]line*SPRITE_PLANE_SPAN},x
+                 sta   tmp_sprite_data+{]line*4}
+                 ldal  spritedata+{]line*SPRITE_PLANE_SPAN}+2,x
+                 sta   tmp_sprite_data+{]line*4}+2
+
+                 ldal  spritemask+{]line*SPRITE_PLANE_SPAN},x
+                 sta   tmp_sprite_mask+{]line*4}
+                 ldal  spritemask+{]line*SPRITE_PLANE_SPAN}+2,x
+                 sta   tmp_sprite_mask+{]line*4}+2
+]line            equ   ]line+1
+                 --^
+
+;                 jmp   FinishTile
+
 ; Reference all of the tile rendering subroutines defined in the TileXXXXX files.  Each file defines
 ; 8 entry points:
 ;
@@ -297,123 +351,6 @@ ClearTile
                  rep             #$20
                  rts
 
-; Helper functions to copy tile data to the appropriate location in Bank 0
-;  X = tile ID
-;  Y = dynamic tile ID
-CopyTileToDyn    ENT
-                 txa
-                 jsr             _GetTileAddr
-                 tax
-
-                 tya
-                 and             #$001F                            ; Maximum of 32 dynamic tiles
-                 asl
-                 asl                                               ; 4 bytes per page
-                 adc             BlitterDP                         ; Add to the bank 00 base address
-                 adc             #$0100                            ; Go to the next page
-                 tay
-                 jsr             CopyTileDToDyn                    ; Copy the tile data
-                 jsr             CopyTileMToDyn                    ; Copy the tile mask
-                 rtl
-
-;  X = address of tile
-;  Y = tile address in bank 0
-CopyTileDToDyn
-                 phb
-                 pea             $0000
-                 plb
-                 plb
-
-                 ldal            tiledata+0,x
-                 sta:            $0000,y
-                 ldal            tiledata+2,x
-                 sta:            $0002,y
-                 ldal            tiledata+4,x
-                 sta             $0100,y
-                 ldal            tiledata+6,x
-                 sta             $0102,y
-                 ldal            tiledata+8,x
-                 sta             $0200,y
-                 ldal            tiledata+10,x
-                 sta             $0202,y
-                 ldal            tiledata+12,x
-                 sta             $0300,y
-                 ldal            tiledata+14,x
-                 sta             $0302,y
-                 ldal            tiledata+16,x
-                 sta             $0400,y
-                 ldal            tiledata+18,x
-                 sta             $0402,y
-                 ldal            tiledata+20,x
-                 sta             $0500,y
-                 ldal            tiledata+22,x
-                 sta             $0502,y
-                 ldal            tiledata+24,x
-                 sta             $0600,y
-                 ldal            tiledata+26,x
-                 sta             $0602,y
-                 ldal            tiledata+28,x
-                 sta             $0700,y
-                 ldal            tiledata+30,x
-                 sta             $0702,y
-
-                 plb
-                 rts
-
-; Helper function to copy tile mask to the appropriate location in Bank 0
-;
-;  X = address of tile
-;  Y = tile address in bank 0
-;
-; Argument are the same as CopyTileDToDyn, the code takes care of adjust offsets.
-; This make is possible to call the two functions back-to-back
-;
-;   ldx tileAddr
-;   ldy dynTileAddr
-;   jsr CopyTileDToDyn
-;   jsr CopyTileMToDyn
-CopyTileMToDyn
-                 phb
-                 pea             $0000
-                 plb
-                 plb
-
-                 ldal            tiledata+32+0,x
-                 sta:            $0080,y
-                 ldal            tiledata+32+2,x
-                 sta:            $0082,y
-                 ldal            tiledata+32+4,x
-                 sta             $0180,y
-                 ldal            tiledata+32+6,x
-                 sta             $0182,y
-                 ldal            tiledata+32+8,x
-                 sta             $0280,y
-                 ldal            tiledata+32+10,x
-                 sta             $0282,y
-                 ldal            tiledata+32+12,x
-                 sta             $0380,y
-                 ldal            tiledata+32+14,x
-                 sta             $0382,y
-                 ldal            tiledata+32+16,x
-                 sta             $0480,y
-                 ldal            tiledata+32+18,x
-                 sta             $0482,y
-                 ldal            tiledata+32+20,x
-                 sta             $0580,y
-                 ldal            tiledata+32+22,x
-                 sta             $0582,y
-                 ldal            tiledata+32+24,x
-                 sta             $0680,y
-                 ldal            tiledata+32+26,x
-                 sta             $0682,y
-                 ldal            tiledata+32+28,x
-                 sta             $0780,y
-                 ldal            tiledata+32+30,x
-                 sta             $0782,y
-
-                 plb
-                 rts
-
 ; CopyBG0Tile
 ;
 ; A low-level function that copies 8x8 tiles directly into the code field space.
@@ -421,14 +358,6 @@ CopyTileMToDyn
 ; A = Tile ID (0 - 511)
 ; X = Tile column (0 - 40)
 ; Y = Tile row (0 - 25)
-CopyBG0Tile      ENT
-                 phb
-                 phk
-                 plb
-                 jsr             _CopyBG0Tile
-                 plb
-                 rtl
-
 _CopyBG0Tile
                  phb                                               ; save the current bank
                  phx                                               ; save the original x-value
@@ -474,14 +403,6 @@ _CopyBG0Tile
 ; A = Tile ID (0 - 511)
 ; X = Tile column (0 - 40)
 ; Y = Tile row (0 - 25)
-CopyBG1Tile
-                 phb
-                 phk
-                 plb
-                 jsr             _CopyBG1Tile
-                 plb
-                 rtl
-
 _CopyBG1Tile
                  phb                                               ; save the current bank
                  phx                                               ; save the original x-value
@@ -518,7 +439,7 @@ _CopyBG1Tile
 ; a tile.
 ;
 ; TileStore+TS_TILE_ID        : Tile descriptor
-; TileStore+TS_DIRTY          : $FFFF is clean, otherwise stores a back-reference to the DirtyTiles array
+; TileStore+TS_DIRTY          : $0000 is clean, any other value indicated a dirty tile
 ; TileStore+TS_TILE_ADDR      : Address of the tile in the tile data buffer
 ; TileStore+TS_CODE_ADDR_LOW  : Low word of the address in the code field that receives the tile
 ; TileStore+TS_CODE_ADDR_HIGH : High word of the address in the code field that receives the tile
@@ -543,262 +464,117 @@ _CopyBG1Tile
 ; TileStore+TS_SPRITE_ADDR_15
 ; TileStore+TS_SPRITE_ADDR_16
 
-
-; TileStore+
-;TileStore        ENT
-;                 ds   TILE_STORE_SIZE*11
-
-; A list of dirty tiles that need to be updated in a given frame
-DirtyTileCount   ds   2
-DirtyTiles       ds   TILE_STORE_SIZE    ; At most this many tiles can possibly be update at once
-
-; Initialize the tile storage data structures.  This takes care of populating the tile records with the
-; appropriate constant values.
-InitTiles
-:col             equ  tmp0
-:row             equ  tmp1
-:vbuff           equ  tmp2
-
-; Fill in the TileStoreYTable.  This is just a table of offsets into the Tile Store for each row.  There
-; are 26 rows with a stride of 41
-                 ldy  #0
-                 lda  #0
-:yloop
-                 sta  TileStoreYTable,y
+; To make processing the tile faster, we do them in chunks of eight.  This allows the loop to be
+; unrolled, which means we don't have to keep track of the register value and makes it faster to
+; clear the dirty tile flag after being processed.
+; _ApplyTilesUnrolled
+                 tdc                       ; Move to the dedicated direct page for tile rendering
                  clc
-                 adc  #41*2
-                 iny
-                 iny
-                 cpy  #26*2
-                 bcc  :yloop
+                 adc  #$100
+                 tcd
 
-; Next, initialize the Tile Store itself
+                 phb                       ; Save the current bank
+                 tsc
+                 sta   tmp0                ; Save it on the direct page
+                 bra   at_loop
 
-                 ldx  #TILE_STORE_SIZE-2
-                 lda  #25
-                 sta  :row
-                 lda  #40
-                 sta  :col
-                 lda  #$8000
-                 sta  :vbuff
+; The DirtyTiles array and the TileStore information is in the Tile Store bank.  Because we
+; process up to 8 tiles as a time and the tile code sets the bank register to the target
+; code field bank, we need to restore the bank register each time.  So, we pre-push
+; 8 copies of the TileStore bank onto the stack.
 
-:loop 
 
-; The first set of values in the Tile Store are changed during each frame based on the actions
-; that are happening
+at_exit
+                 tdc                             ; Move back to the original direct page
+                 sec
+                 sbc  #$100
+                 tcd
 
-                 lda  #0
-                 stal TileStore+TS_TILE_ID,x            ; clear the tile store with the special zero tile
-                 stal TileStore+TS_TILE_ADDR,x
-                 stal TileStore+TS_TILE_DISP,x
-
-                 stal TileStore+TS_SPRITE_FLAG,x        ; no sprites are set at the beginning
-                 lda  #$FFFF                            ; none of the tiles are dirty
-                 stal TileStore+TS_DIRTY,x
-
-                 lda  :vbuff                            ; array of sprite vbuff addresses per tile
-                 stal TileStore+TS_VBUFF_ARRAY_ADDR,x
-                 clc
-                 adc  #32
-                 sta  :vbuff
-
-; The next set of values are constants that are simply used as cached parameters to avoid needing to
-; calculate any of these values during tile rendering
-
-                 lda  :row                              ; Set the long address of where this tile
-                 asl                                    ; exists in the code fields
-                 tay
-                 lda  BRowTableHigh,y
-                 stal TileStore+TS_CODE_ADDR_HIGH,x     ; High word of the tile address (just the bank)
-                 lda  BRowTableLow,y
-                 stal TileStore+TS_BASE_ADDR,x          ; May not be needed later if we can figure out the right constant...
-
-                 lda  :col                              ; Set the offset values based on the column
-                 asl                                    ; of this tile
-                 asl
-                 stal TileStore+TS_WORD_OFFSET,x        ; This is the offset from 0 to 82, used in LDA (dp),y instruction
-                 
-                 tay
-                 lda  Col2CodeOffset+2,y
-                 clc
-                 adcl TileStore+TS_BASE_ADDR,x
-                 stal TileStore+TS_CODE_ADDR_LOW,x      ; Low word of the tile address in the code field
-
-                 dec  :col
-                 bpl  :hop
-                 dec  :row
-                 lda  #40
-                 sta  :col
-:hop
-
-                 dex
-                 dex
-                 bpl  :loop
+                 plb                             ; Restore the original data bank and return
                  rts
+dt_base          equ   $FE                        ; top of second direct page space
 
-_ClearDirtyTiles
-                 bra  :hop
-:loop
-                 jsr  _PopDirtyTile
-:hop
-                 lda  DirtyTileCount
-                 bne  :loop
-                 rts
+at_loop
+                 lda   tmp0
+                 tcs
 
-; Helper function to get the address offset into the tile cachce / tile backing store
-; X = tile column [0, 40] (41 columns)
-; Y = tile row    [0, 25] (26 rows)
-GetTileStoreOffset ENT
-                 phb
-                 phk
-                 plb
-                 jsr  _GetTileStoreOffset
-                 plb
-                 rtl
+                 lda  DirtyTileCount              ; This is pre-multiplied by 2
+                 beq  at_exit                     ; If there are no items, exit
 
+                 ldx   TileStoreBankDoubled
+                 phx
+                 phx
+                 phx
 
-_GetTileStoreOffset
-                 phx                        ; preserve the registers
-                 phy
+                 cmp  #16                         ; If there are >= 8 elements, then
+                 bcs  at_chunk                    ; do a full chunk
 
-                 jsr  _GetTileStoreOffset0
-
-                 ply
-                 plx
-                 rts
-
-_GetTileStoreOffset0
-                 tya
-                 asl
-                 tay
-                 txa
-                 asl
-                 clc
-                 adc  TileStoreYTable,y
-                 rts
-
-; Set a tile value in the tile backing store.  Mark dirty if the value changes
-;
-; A = tile id
-; X = tile column [0, 40] (41 columns)
-; Y = tile row    [0, 25] (26 rows)
-;
-; Registers are not preserved
-_SetTile
-                 pha
-                 jsr  _GetTileStoreOffset0          ; Get the address of the X,Y tile position
+                 stz  DirtyTileCount              ; Otherwise, this pass will handle them all
                  tax
-                 pla
-                 
-                 cmpl TileStore+TS_TILE_ID,x        ; Only set to dirty if the value changed
-                 beq  :nochange
+                 jmp  (at_table,x)
+at_table         da   at_exit,at_one,at_two,at_three
+                 da   at_four,at_five,at_six,at_seven
 
-                 stal TileStore+TS_TILE_ID,x        ; Value is different, store it.
-                 jsr  _GetTileAddr
-                 stal TileStore+TS_TILE_ADDR,x      ; Committed to drawing this tile, so get the address of the tile in the tiledata bank for later
+at_chunk         sec
+                 sbc  #16
+                 sta  DirtyTileCount              ; Fall through
 
-                 ldal TileStore+TS_TILE_ID,x
-                 and  #TILE_VFLIP_BIT+TILE_HFLIP_BIT ; get the lookup value
-                 xba
-                 stal TileStore+TS_TILE_DISP,x
+; Because all of the registers get used in the _RenderTile2 subroutine, we
+; push the values from the DirtyTiles array onto the stack and then pop off
+; the values as we go
 
-;                txa                                ; Add this tile to the list of dirty tiles to refresh
-                 jmp  _PushDirtyTileX               ; on the next call to _ApplyTiles
+                 ldy   dt_base                    ; Reload the base index
+                 ldx   DirtyTiles+14,y            ; Load the TileStore offset
+                 stz   TileStore+TS_DIRTY,x       ; Clear this tile's dirty flag
+                 jsr  _RenderTile2                ; Draw the tile
+                 plb                              ; Reset the data bank to the TileStore bank
 
-:nochange        rts
-           
-
-; Append a new dirty tile record 
-;
-;  A = result of _GetTileStoreOffset for X, Y
-;
-; The main purpose of this function is to
-;
-;  1. Avoid marking the same tile dirty multiple times, and
-;  2. Pre-calculating all of the information necessary to render the tile
-PushDirtyTile    ENT
-                 phb
-                 phk
-                 plb
-                 jsr  _PushDirtyTile
-                 plb
-                 rtl
-
-; alternate version that is very slightly slower, but preserves the y-register
-_PushDirtyTile
-                 tax
-
-; alternate entry point if the x-register is already set
-_PushDirtyTileX
-                 ldal TileStore+TS_DIRTY,x
-                 bpl  :occupied2
-
-                 txa                                  ; any non-negative value will work, this saves work below
-                 stal TileStore+TS_DIRTY,x            ; and is 1 cycle faster than loading a constant value
-
-                 ldx  DirtyTileCount ; 4
-                 sta  DirtyTiles,x   ; 6
-                 inx                 ; 2
-                 inx                 ; 2
-                 stx  DirtyTileCount ; 4 = 18
-                 rts
-:occupied2
-                 txa                                ; Make sure TileStore offset is returned in the accumulator
-                 rts
-
-; Remove a dirty tile from the list and return it in state ready to be rendered.  It is important
-; that the core rendering functions *only* use _PopDirtyTile to get a list of tiles to update,
-; because this routine merges the tile IDs stored in the Tile Store with the Sprite
-; information to set the TILE_SPRITE_BIT.  This is the *only* place in the entire code base that
-; applies this bit to a tile descriptor.
-PopDirtyTile     ENT
-                 phb
-                 phk
-                 plb
-                 jsr  _PopDirtyTile
-                 plb
-                 rtl
-
-_PopDirtyTile
-                 ldy  DirtyTileCount
-                 bne  _PopDirtyTile2
-                 rts
-
-_PopDirtyTile2                                       ; alternate entry point
-                 dey
-                 dey
-                 sty  DirtyTileCount                 ; remove last item from the list
-
-                 ldx  DirtyTiles,y                   ; load the offset into the Tile Store
-                 lda  #$FFFF
-                 stal TileStore+TS_DIRTY,x           ; clear the occupied backlink
-                 rts
-
-; Run through the dirty tile list and render them into the code field
-ApplyTiles       ENT
-                 phb
-                 phk
-                 plb
-                 jsr  _ApplyTiles
-                 plb
-                 rtl
-
-_ApplyTiles
-                 bra  :begin
-
-:loop
-; Retrieve the offset of the next dirty Tile Store items in the X-register
-
-                 jsr  _PopDirtyTile2
-
-; Call the generic dispatch with the Tile Store record pointer at by the X-register.
-
-                 phb
-                 jsr  _RenderTile2
+at_seven
+                 ldy   dt_base
+                 ldx   DirtyTiles+12,y
+                 stz   TileStore+TS_DIRTY,x
+                 jsr   _RenderTile2
                  plb
 
-; Loop again until the list of dirty tiles is empty
+at_six
+                 ldy   dt_base
+                 ldx   DirtyTiles+10,y
+                 stz   TileStore+TS_DIRTY,x
+                 jsr   _RenderTile2
+                 plb
 
-:begin           ldy  DirtyTileCount
-                 bne  :loop
-                 rts
\ No newline at end of file
+at_five
+                 ldy   dt_base
+                 ldx   DirtyTiles+8,y
+                 stz   TileStore+TS_DIRTY,x
+                 jsr   _RenderTile2
+                 plb
+
+at_four
+                 ldy   dt_base
+                 ldx   DirtyTiles+6,y
+                 stz   TileStore+TS_DIRTY,x
+                 jsr   _RenderTile2
+                 plb
+
+at_three
+                 ldy   dt_base
+                 ldx   DirtyTiles+4,y
+                 jsr   _RenderTile2
+                 plb
+
+at_two
+                 ldy   dt_base
+                 ldx   DirtyTiles+2,y
+                 stz   TileStore+TS_DIRTY,x
+                 jsr   _RenderTile2
+                 plb
+
+at_one
+                 ldy   dt_base
+                 ldx   DirtyTiles+0,y
+                 stz   TileStore+TS_DIRTY,x
+                 jsr   _RenderTile2
+                 plb
+
+                 jmp   at_loop
diff --git a/src/blitter/Tiles00000.s b/src/blitter/Tiles00000.s
index 709b54d..19fc409 100644
--- a/src/blitter/Tiles00000.s
+++ b/src/blitter/Tiles00000.s
@@ -36,6 +36,53 @@ _TBSolidTile_VH
 ;
 ; This does not increase the FPS by 37% because only a small number of tiles are drawn each frame, but it
 ; has an impact and can significantly help out when sprites trigger more dirty tile updates than normal.
+
+
+; This is called via a JMP (abs,x) with an extra byte on the stack that holds the bank
+; register value.  This must be restored prior to returning
+CopyTileAFast
+                 tax
+_CopyTileAFast
+]line            equ             0
+                 lup             8
+                 ldal            tiledata+{]line*4},x
+                 sta:            $0004+{]line*$1000},y
+                 ldal            tiledata+{]line*4}+2,x
+                 sta:            $0001+{]line*$1000},y
+]line            equ             ]line+1
+                 --^
+                 plb
+                 rts
+
+CopyTileASlow
+                 tax
+                 jsr   FillPEAOpcode
+                 jmp   _CopyTileAFast
+
+CopyTileVFast
+                 tax
+_CopyTileVFast
+]src             equ             7
+]dest            equ             0
+                 lup             8
+                 ldal            tiledata+{]src*4},x
+                 sta:            $0004+{]dest*$1000},y
+                 ldal            tiledata+{]src*4}+2,x
+                 sta:            $0001+{]dest*$1000},y
+]src             equ             ]src-1
+]dest            equ             ]dest+1
+                 --^
+                 plb
+                 rts
+
+CopyTileVSlow
+                 tax
+                 jsr   FillPEAOpcode
+                 jmp   _CopyTileVFast
+
+
+
+; Old routines
 _TBCopyData
 ]line            equ             0
                  lup             8
@@ -47,17 +94,6 @@ _TBCopyData
                  --^
                  rts
 
-;_TBCopyDataH
-;]line            equ             0
-;                 lup             8
-;                 ldal            tiledata+{]line*4}+64,x
-;                 sta:            $0004+{]line*$1000},y
-;                 ldal            tiledata+{]line*4}+66,x
-;                 sta:            $0001+{]line*$1000},y
-;]line            equ             ]line+1
-;                 --^
-;                 rts
-
 _TBCopyDataV
 ]src             equ             7
 ]dest            equ             0
@@ -71,40 +107,3 @@ _TBCopyDataV
                  --^
                  rts
 
-;_TBCopyDataVH
-;]src             equ             7
-;]dest            equ             0
-;                 lup             8
-;                 ldal            tiledata+{]src*4}+64,x
-;                 sta:            $0004+{]dest*$1000},y
-;                 ldal            tiledata+{]src*4}+66,x
-;                 sta:            $0001+{]dest*$1000},y
-;]src             equ             ]src-1
-;]dest            equ             ]dest+1
-;                 --^
-;                 rts
-
-; A simple helper function that fill in all of the opcodes of a tile with the PEA opcode.  This is
-; a common function since a tile must be explicitly flagged to use a mask, so this routine is used
-; quite frequently in a well-designed tile map.
-_TBFillPEAOpcode
-                 sep             #$20
-                 lda             #$F4
-                 sta:            $0000,y
-                 sta:            $0003,y
-                 sta             $1000,y
-                 sta             $1003,y
-                 sta             $2000,y
-                 sta             $2003,y
-                 sta             $3000,y
-                 sta             $3003,y
-                 sta             $4000,y
-                 sta             $4003,y
-                 sta             $5000,y
-                 sta             $5003,y
-                 sta             $6000,y
-                 sta             $6003,y
-                 sta             $7000,y
-                 sta             $7003,y
-                 rep             #$20
-                 rts
diff --git a/src/blitter/Tiles00001.s b/src/blitter/Tiles00001.s
index 505abb2..f44aefa 100644
--- a/src/blitter/Tiles00001.s
+++ b/src/blitter/Tiles00001.s
@@ -12,6 +12,48 @@ _TBDynamicTile_00
                  jsr             _TBDynamicData
                  jmp             _TBFillLdaDpOpcode
 
+_TBDynamic
+                 ldal   TileStore+TS_TILE_ID,x
+                 and    #$007F
+                 ora    #$4800
+
+]line            equ             0                                 ; render the first column
+                 lup             8
+                 sta:            $0004+{]line*$1000},y
+]line            equ             ]line+1
+                 --^
+
+                 inc                                               ; advance to the next word
+                 inc
+
+]line            equ             0                                 ; render the second column
+                 lup             8
+                 sta:            $0001+{]line*$1000},y
+]line            equ             ]line+1
+                 --^
+
+                 sep             #$20
+                 lda             #$B5
+                 sta:            $0000,y
+                 sta:            $0003,y
+                 sta             $1000,y
+                 sta             $1003,y
+                 sta             $2000,y
+                 sta             $2003,y
+                 sta             $3000,y
+                 sta             $3003,y
+                 sta             $4000,y
+                 sta             $4003,y
+                 sta             $5000,y
+                 sta             $5003,y
+                 sta             $6000,y
+                 sta             $6003,y
+                 sta             $7000,y
+                 sta             $7003,y
+                 rep             #$20
+
+                 plb
+                 rts
 ; Primitive to render a dynamic tile
 ;
 ; LDA 00,x / PHA where the operand is fixed when the tile is rendered
diff --git a/src/blitter/Tiles10000.s b/src/blitter/Tiles10000.s
index df1b0ab..d56861a 100644
--- a/src/blitter/Tiles10000.s
+++ b/src/blitter/Tiles10000.s
@@ -30,7 +30,6 @@ _TBFastSpriteTile_VH
 ; Need to update the X-register before calling this
 _TBApplySpriteData
                  ldx   _SPR_X_REG                               ; set to the unaligned tile block address in the sprite plane
-
 ]line            equ   0
                  lup   8
                  lda   blttmp+{]line*4}
@@ -46,118 +45,46 @@ _TBApplySpriteData
                  --^
                  rts 
 
-; Copy tile data into the direct page compositing buffer.  The main reason to do this in full passes is
-; because we can avoid needing to use both the X and Y registers during the compositing process and
-; reserve Y to hold the code field address.
-;
-; Also, we can get away with not setting the bank register, this is a wash in terms of speed, but results
-; in simpler, more composable subroutines
-_TBCopyTileDataToCBuff
+_TBApplySpriteDataOne
+                 ldx  spriteIdx
 ]line            equ   0
                  lup   8
-                 ldal  tiledata+{]line*4},x
-                 sta   blttmp+{]line*4}
+                 lda   blttmp+{]line*4}
+                 andl  spritemask+{]line*SPRITE_PLANE_SPAN},x
+                 oral  spritedata+{]line*SPRITE_PLANE_SPAN},x
+                 sta:  $0004+{]line*$1000},y
 
-                 ldal  tiledata+{]line*4}+2,x
-                 sta   blttmp+{]line*4}+2
+                 lda   blttmp+{]line*4}+2
+                 andl  spritemask+{]line*SPRITE_PLANE_SPAN}+2,x
+                 oral  spritedata+{]line*SPRITE_PLANE_SPAN}+2,x
+                 sta:  $0001+{]line*$1000},y
 ]line            equ   ]line+1
                  --^
-                 rts
+                 rts 
 
-;_TBCopyTileDataToCBuffH
-;]line            equ   0
-;                 lup   8
-;                 ldal  tiledata+{]line*4}+64,x
-;                 sta   blttmp+{]line*4}
-;
-;                 ldal  tiledata+{]line*4}+64+2,x
-;                 sta   blttmp+{]line*4}+2
-;]line            equ   ]line+1
-;                 --^
-;                 rts
-
-_TBCopyTileDataToCBuffV
-]src             equ             7
-]dest            equ             0
-                 lup             8
-                 ldal            tiledata+{]src*4},x
-                 sta             blttmp+{]dest*4}
-
-                 ldal            tiledata+{]src*4}+2,x
-                 sta             blttmp+{]dest*4}+2
-]src             equ             ]src-1
-]dest            equ             ]dest+1
-                 --^
-                 rts
-
-;_TBCopyTileDataToCBuffVH
-;]src             equ             7
-;]dest            equ             0
-;                 lup             8
-;                 ldal            tiledata+{]src*4}+64,x
-;                 sta             blttmp+{]dest*4}
-;
-;                 ldal            tiledata+{]src*4}+64+2,x
-;                 sta             blttmp+{]dest*4}+2
-;]src             equ             ]src-1
-;]dest            equ             ]dest+1
-;                 --^
-;                 rts
-
-
-; Copy tile mask data into the direct page compositing buffer.
-_TBCopyTileMaskToCBuff
+_TBApplySpriteDataTwo
 ]line            equ   0
                  lup   8
-                 ldal  tiledata+{]line*4}+32,x
-                 sta   blttmp+{]line*4}+32
+                 lda   blttmp+{]line*4}
+                 ldx  spriteIdx+2
+                 andl  spritemask+{]line*SPRITE_PLANE_SPAN},x
+                 oral  spritedata+{]line*SPRITE_PLANE_SPAN},x
+                 ldx  spriteIdx
+                 andl  spritemask+{]line*SPRITE_PLANE_SPAN},x
+                 oral  spritedata+{]line*SPRITE_PLANE_SPAN},x
+                 sta:  $0004+{]line*$1000},y
 
-                 ldal  tiledata+{]line*4}+32+2,x
-                 sta   blttmp+{]line*4}+32+2
+                 lda   blttmp+{]line*4}+2
+                 ldx  spriteIdx+2
+                 andl  spritemask+{]line*SPRITE_PLANE_SPAN}+2,x
+                 oral  spritedata+{]line*SPRITE_PLANE_SPAN}+2,x
+                 ldx  spriteIdx
+                 andl  spritemask+{]line*SPRITE_PLANE_SPAN}+2,x
+                 oral  spritedata+{]line*SPRITE_PLANE_SPAN}+2,x
+                 sta:  $0001+{]line*$1000},y
 ]line            equ   ]line+1
                  --^
-                 rts
-
-;_TBCopyTileMaskToCBuffH
-;]line            equ   0
-;                 lup   8
-;                 ldal  tiledata+{]line*4}+32+64,x
-;                 sta   blttmp+{]line*4}+32
-;
-;                 ldal  tiledata+{]line*4}+32+64+2,x
-;                 sta   blttmp+{]line*4}+32+2
-;]line            equ   ]line+1
-;                 --^
-;                 rts
-
-_TBCopyTileMaskToCBuffV
-]src             equ             7
-]dest            equ             0
-                 lup             8
-                 ldal            tiledata+{]src*4}+32,x
-                 sta             blttmp+{]dest*4}+32
-
-                 ldal            tiledata+{]src*4}+32+2,x
-                 sta             blttmp+{]dest*4}+32+2
-]src             equ             ]src-1
-]dest            equ             ]dest+1
-                 --^
-                 rts
-
-;_TBCopyTileMaskToCBuffVH
-;]src             equ             7
-;]dest            equ             0
-;                 lup             8
-;                 ldal            tiledata+{]src*4}+32+64,x
-;                 sta             blttmp+{]dest*4}+32
-;
-;                 ldal            tiledata+{]src*4}+32+64+2,x
-;                 sta             blttmp+{]dest*4}+32+2
-;]src             equ             ]src-1
-;]dest            equ             ]dest+1
-;                 --^
-;                 rts
-
+                 rts 
 
 ; Copy just the data into the code field from the composite buffer
 _TBSolidComposite
diff --git a/src/blitter/Tiles10001.s b/src/blitter/Tiles10001.s
index 438921f..54adc98 100644
--- a/src/blitter/Tiles10001.s
+++ b/src/blitter/Tiles10001.s
@@ -3,6 +3,48 @@
 ; This tile type does not explicitly support horizontal or vertical flipping.  An appropriate tile
 ; descriptor should be passed into CopyTileToDyn to put the horizontally or vertically flipped source
 ; data into the dynamic tile buffer
+_TBDynamicSpriteTile
+                 sta     _X_REG
+                 ldal    TileStore+TS_JMP_ADDR,x      ; Get the address of the exception handler
+                 sta     _JTBL_CACHE
+
+                 ldal    TileStore+TS_TILE_ID,x       ; Get the original tile descriptor
+                 and     #$007F                       ; clamp to < (32 * 4)
+                 ora     #$B500
+                 xba
+                 sta     _OP_CACHE                    ; This is the 2-byte opcode for to load the data
+
+                 CopyDynWord  0;$0003
+                 CopyDynWord  4;$1003
+                 CopyDynWord  8;$2003
+                 CopyDynWord  12;$3003
+                 CopyDynWord  16;$4003
+                 CopyDynWord  20;$5003
+                 CopyDynWord  24;$6003
+                 CopyDynWord  28;$7003
+
+                 clc
+                 lda     _JTBL_CACHE
+                 adc     #32                          ; All the snippets are 32 bytes wide and, since we're
+                 sta     _JTBL_CACHE                  ; within one tile, the second column is consecutive
+
+                 lda     _OP_CACHE
+                 adc     #$0200                       ; Advance to the next word
+                 sta     _OP_CACHE
+
+                 CopyDynWord  2;$0000
+                 CopyDynWord  6;$1000
+                 CopyDynWord  10;$2000
+                 CopyDynWord  14;$3000
+                 CopyDynWord  18;$4000
+                 CopyDynWord  22;$5000
+                 CopyDynWord  26;$6000
+                 CopyDynWord  30;$7000
+
+                 plb
+                 rts
+
+
 _TBDynamicSpriteTile_00
                  sty             _Y_REG               ; This is restored in the macro
 
@@ -53,6 +95,56 @@ _TBDynamicSpriteTile_00
 
                  rts
 
+; Create a masked render based on data in the direct page temporary buffer
+; 
+; ]1 : sprite buffer offset
+; ]2 : code field offset
+CopyDynWord     mac
+                lda   tmp_sprite_mask+{]1}     ; load the mask value
+                bne   mixed                    ; a non-zero value may be mixed
+
+; This is a solid word
+                lda   #$00F4                   ; PEA instruction
+                sta:  ]2,y
+                lda   tmp_sprite_data+{]1}     ; load the sprite data
+                sta:  ]2+1,y                   ; PEA operand
+                bra   next
+
+mixed           cmp   #$FFFF                   ; All 1's in the mask is a fully transparent sprite word
+                beq   transparent
+
+                lda   #$004C                   ; JMP to handler
+                sta:  {]2},y
+                lda   _JTBL_CACHE              ; Get the offset to the exception handler for this column
+                ora   #{]2&$F000}              ; adjust for the current row offset
+                sta:  {]2}+1,y
+                tax                            ; This becomes the new address that we use to patch in
+
+                lda   _OP_CACHE       ; Get the LDA dp,x instruction for this column
+                sta:  $0000,x
+
+                lda   #$0029          ; AND #SPRITE_MASK
+                sta:  $0002,x
+                lda   tmp_sprite_mask+{]1}
+                sta:  $0003,x
+
+                lda   #$0009          ; ORA #SPRITE_DATA
+                sta:  $0005,x
+                lda   tmp_sprite_data+{]1}
+                sta:  $0006,x
+
+                lda   #$0D80          ; branch to the prologue (BRA *+15)
+                sta:  $0008,x
+                bra   next
+
+; This is a transparent word, so just show the dynamic data
+transparent
+                lda   #$4800          ; Put the PHA in the third byte
+                sta:  {]2}+1,y
+                lda   _OP_CACHE       ; Store the LDA dp,x instruction with operand
+                sta:  {]2},y
+next
+                 <<<
 
 ; Masked renderer for a dynamic tile with sprite data overlaid.
 ;
@@ -70,13 +162,13 @@ CopyDynSpriteWord MAC
 ;
 ; If MASK == 0, then we can do a PEA.  If MASK == $FFFF, then fall back to the simple Dynamic Tile
 ; code.
-                ldal  spritemask+]1,x            ; load the mask value
-                bne   mixed                      ; a non-zero value may be mixed
+                ldal  spritemask+{]1},x            ; load the mask value
+                bne   mixed                        ; a non-zero value may be mixed
 
 ; This is a solid word
                 lda   #$00F4          ; PEA instruction
                 sta:  ]2,y
-                ldal  spritedata+]1,x ; load the sprite data
+                ldal  spritedata+{]1},x ; load the sprite data
                 sta:  ]2+1,y          ; PEA operand
                 bra   next
 
@@ -95,12 +187,12 @@ mixed           cmp   #$FFFF          ; All 1's in the mask is a fully transpare
 
                 lda   #$0029          ; AND #SPRITE_MASK
                 sta:  $0002,y
-                ldal  spritemask+]1,x 
+                ldal  spritemask+{]1},x 
                 sta:  $0003,y
 
                 lda   #$0009          ; ORA #SPRITE_DATA
                 sta:  $0005,y
-                ldal  spritedata+]1,x
+                ldal  spritedata+{]1},x
                 sta:  $0006,y
 
                 lda   #$0D80          ; branch to the prologue (BRA *+15)
diff --git a/src/blitter/Tiles10011.s b/src/blitter/Tiles10011.s
index 51a4e0c..9778560 100644
--- a/src/blitter/Tiles10011.s
+++ b/src/blitter/Tiles10011.s
@@ -82,13 +82,13 @@ CopyDynMaskedSpriteWord MAC
 ; If MASK == 0, then we can do a PEA.  If MASK == $FFFF, then fall back to the simple Dynamic Tile
 ; code and eliminate the constanct AND/ORA instructions.
 
-                ldal  spritemask+]1,x            ; load the mask value
+                ldal  spritemask+{]1},x            ; load the mask value
                 bne   mixed                      ; a non-zero value may be mixed
 
 ; This is a solid word
                 lda   #$00F4          ; PEA instruction
                 sta:  ]2,y
-                ldal  spritedata+]1,x ; load the sprite data
+                ldal  spritedata+{]1},x ; load the sprite data
                 sta:  ]2+1,y          ; PEA operand
                 bra   next
 
@@ -99,7 +99,7 @@ mixed
                 sta:  ]2,y
                 lda   _JTBL_CACHE     ; Get the offset to the exception handler for this column
                 ora   #{]2&$F000}     ; adjust for the current row offset
-                sta:  ]2+1,y
+                sta:  {]2}+1,y
                 tay                   ; This becomes the new address that we use to patch in
 
                 lda   _OP_CACHE
@@ -111,14 +111,14 @@ mixed
 
                 lda   #$0029          ; AND #SPRITE_MASK
                 sta:  $0006,y
-                ldal  spritemask+]1,x 
+                ldal  spritemask+{]1},x 
                 cmp   #$FFFF          ; All 1's in the mask is a fully transparent sprite word
                 beq   transparent     ; so we can use the Tile00011 method
                 sta:  $0007,y
 
                 lda   #$0009          ; ORA #SPRITE_DATA
                 sta:  $0009,y
-                ldal  spritedata+]1,x
+                ldal  spritedata+{]1},x
                 sta:  $000A,y
 
                 lda   #$0980          ; branch to the prologue (BRA *+11)
diff --git a/src/blitter/Tiles11001.s b/src/blitter/Tiles11001.s
index c33232d..eafc342 100644
--- a/src/blitter/Tiles11001.s
+++ b/src/blitter/Tiles11001.s
@@ -77,7 +77,7 @@ CopyDynPriSpriteWord MAC
 
                 lda   #$00A9          ; LDA #DATA
                 sta:  $0000,y
-                ldal  spritedata+]1,x
+                ldal  spritedata+{]1},x
                 sta:  $0001,y
 
                 lda   _OP_CACHE
diff --git a/src/blitter/Tiles11011.s b/src/blitter/Tiles11011.s
index d306cb3..2f6f9a3 100644
--- a/src/blitter/Tiles11011.s
+++ b/src/blitter/Tiles11011.s
@@ -90,14 +90,14 @@ CopyDynPrioMaskedSpriteWord MAC
                 lda   #$0029          ; AND #SPRITE_MASK
                 sta:  $0002,y
 
-                ldal  spritemask+]1,x
+                ldal  spritemask+{]1},x
                 cmp   #$FFFF          ; All 1's in the mask is a fully transparent sprite word
                 beq   transparent     ; so we can use the Tile00011 method
                 sta:  $0003,y
 
                 lda   #$0009          ; ORA #SPRITE_DATA
                 sta:  $0005,y
-                ldal  spritedata+]1,x
+                ldal  spritedata+{]1},x
                 sta:  $0006,y
 
                 lda   _T_PTR
diff --git a/src/blitter/TilesBG1.s b/src/blitter/TilesBG1.s
index 5345830..9825e11 100644
--- a/src/blitter/TilesBG1.s
+++ b/src/blitter/TilesBG1.s
@@ -1,4 +1,26 @@
+
+; On entry
+;
+; B is set to the correct BG1 data bank
+; A is set to the the tile descriptor
+; Y is set to the top-left address of the tile in the BG1 data bank
+;
+; tmp0/tmp1 is reserved 
+_RenderTileBG1
+                 pha                                               ; Save the tile descriptor
+
+                 and             #TILE_VFLIP_BIT+TILE_HFLIP_BIT    ; Only horizontal and vertical flips are supported for BG1
+                 xba
+                 tax
+
+                 pla
+                 and             #TILE_ID_MASK                     ; Mask out the ID and save just that
+                 _Mul128                                           ; multiplied by 128
+                 jmp             (:actions,x)
+:actions         dw              _TBSolidBG1_00,_TBSolidBG1_0H,_TBSolidBG1_V0,_TBSolidBG1_VH
+
 _TBSolidBG1_00
+                 tax
 ]line            equ             0
                  lup             8
                  ldal            tiledata+{]line*4},x
@@ -10,6 +32,7 @@ _TBSolidBG1_00
                  rts
 
 _TBSolidBG1_0H
+                 tax
 ]line            equ             0
                  lup             8
                  ldal            tiledata+{]line*4}+64,x
@@ -21,6 +44,7 @@ _TBSolidBG1_0H
                  rts
 
 _TBSolidBG1_V0
+                 tax
 ]src             equ             7
 ]dest            equ             0
                  lup             8
@@ -34,6 +58,7 @@ _TBSolidBG1_V0
                  rts
 
 _TBSolidBG1_VH
+                 tax
 ]src             equ             7
 ]dest            equ             0
                  lup             8
diff --git a/src/blitter/Vert.s b/src/blitter/Vert.s
index 14e4535..042cce3 100644
--- a/src/blitter/Vert.s
+++ b/src/blitter/Vert.s
@@ -2,28 +2,6 @@
 ; of these routines are to adjust tables and patch in new values into the code field
 ; when the virtual Y-position of the play field changes.
 
-
-; SetBG0YPos
-;
-; Set the virtual position of the primary background layer.
-SetBG0YPos           ENT
-                     jsr   _SetBG0YPos
-                     rtl
-
-_SetBG0YPos
-                     cmp   StartY
-                     beq   :out                 ; Easy, if nothing changed, then nothing changes
-
-                     ldx   StartY               ; Load the old value (but don't save it yet)
-                     sta   StartY               ; Save the new position
-
-                     lda   #DIRTY_BIT_BG0_Y
-                     tsb   DirtyBits            ; Check if the value is already dirty, if so exit
-                     bne   :out                 ; without overwriting the original value
-
-                     stx   OldStartY            ; First change, so preserve the value
-:out                 rts
-
 ; Based on the current value of StartY in the direct page.  Set up the dispatch
 ; information so that the BltRange driver will render the correct code field
 ; lines in the correct order
@@ -67,6 +45,7 @@ _ApplyBG0YPos
 ; and ~2,500 per secord.  This is ~1% of our total CPU budget and is *just* enough cycles to be
 ; interesting.... Another 8 cycles could be removed by doing all calculatinos pre-multiplied by 2
 ; to avoid several 'asl' instructions
+                     phb
 :loop
                      lda   :virt_line
                      asl
@@ -112,9 +91,9 @@ _ApplyBG0YPos
                      sta   :lines_left
 
                      jne   :loop
-
-                     phk
                      plb
+
+:out
                      rts
 
 ; Unrolled copy routine to move RTable intries into STK_ADDR position.  
@@ -167,7 +146,7 @@ CopyRTableToStkAddr
 :x14                 ldal  RTable+26,x
                      sta   STK_ADDR+$D000,y
 :x13                 ldal  RTable+24,x
-                     sta:  STK_ADDR+$C000,y
+                     sta   STK_ADDR+$C000,y
 :x12                 ldal  RTable+22,x
                      sta   STK_ADDR+$B000,y
 :x11                 ldal  RTable+20,x
@@ -175,7 +154,7 @@ CopyRTableToStkAddr
 :x10                 ldal  RTable+18,x
                      sta   STK_ADDR+$9000,y
 :x09                 ldal  RTable+16,x
-                     sta:  STK_ADDR+$8000,y
+                     sta   STK_ADDR+$8000,y
 :x08                 ldal  RTable+14,x
                      sta   STK_ADDR+$7000,y
 :x07                 ldal  RTable+12,x
@@ -183,7 +162,7 @@ CopyRTableToStkAddr
 :x06                 ldal  RTable+10,x
                      sta   STK_ADDR+$5000,y
 :x05                 ldal  RTable+08,x
-                     sta:  STK_ADDR+$4000,y
+                     sta   STK_ADDR+$4000,y
 :x04                 ldal  RTable+06,x
                      sta   STK_ADDR+$3000,y
 :x03                 ldal  RTable+04,x
diff --git a/src/render/Dynamic.s b/src/render/Dynamic.s
new file mode 100644
index 0000000..d417675
--- /dev/null
+++ b/src/render/Dynamic.s
@@ -0,0 +1,711 @@
+; Rendering functions for Dynamic tiles.  There are no Fast/Slow variants here
+CopyDynamicTile
+            ldal   TileStore+TS_TILE_ID,x
+            and    #$007F
+            ora    #$4800
+
+]line       equ    0             ; render the first column
+            lup    8
+            sta:   $0004+{]line*$1000},y
+]line       equ    ]line+1
+            --^
+
+            inc                  ; advance to the next word
+            inc
+
+]line       equ    0             ; render the second column
+            lup    8
+            sta:   $0001+{]line*$1000},y
+]line       equ    ]line+1
+            --^
+
+            sep    #$20
+            lda    #$B5
+            sta:   $0000,y
+            sta:   $0003,y
+            sta    $1000,y
+            sta    $1003,y
+            sta    $2000,y
+            sta    $2003,y
+            sta    $3000,y
+            sta    $3003,y
+            sta    $4000,y
+            sta    $4003,y
+            sta    $5000,y
+            sta    $5003,y
+            sta    $6000,y
+            sta    $6003,y
+            sta    $7000,y
+            sta    $7003,y
+            rep    #$20
+            plb
+            rts
+
+; These routines handle the sprites.  They rely on a fairly complicated macro that takes care of
+; populating the code field and snippet space
+DynamicOver
+            lda     TileStore+TS_JMP_ADDR,x      ; Get the address of the exception handler
+            sta     _JTBL_CACHE
+
+            lda     TileStore+TS_TILE_ID,x       ; Get the original tile descriptor
+            and     #$007F             ; clamp to < (32 * 4)
+            ora     #$B500
+            xba
+            sta     _OP_CACHE          ; This is the 2-byte opcode for to load the data
+
+            lda   TileStore+TS_CODE_ADDR_HIGH,x
+            pha
+            ldy   TileStore+TS_CODE_ADDR_LOW,x
+            plb
+
+            CopyDynOver  0;$0003
+            CopyDynOver  4;$1003
+            CopyDynOver  8;$2003
+            CopyDynOver  12;$3003
+            CopyDynOver  16;$4003
+            CopyDynOver  20;$5003
+            CopyDynOver  24;$6003
+            CopyDynOver  28;$7003
+
+            sec
+            lda     _JTBL_CACHE
+            sbc     #SNIPPET_SIZE      ; Advance to the next snippet (Reverse indexing)
+            sta     _JTBL_CACHE
+
+            clc
+            lda     _OP_CACHE
+            adc     #$0200             ; Advance to the next word
+            sta     _OP_CACHE
+
+            CopyDynOver  2;$0000
+            CopyDynOver  6;$1000
+            CopyDynOver  10;$2000
+            CopyDynOver  14;$3000
+            CopyDynOver  18;$4000
+            CopyDynOver  22;$5000
+            CopyDynOver  26;$6000
+            CopyDynOver  30;$7000
+
+            plb
+            rts
+
+DynamicUnder
+            lda     TileStore+TS_JMP_ADDR,x      ; Get the address of the exception handler
+            sta     _JTBL_CACHE
+
+            lda     TileStore+TS_TILE_ID,x       ; Get the original tile descriptor
+            and     #$007F             ; clamp to < (32 * 4)
+            ora     #$3580             ; Pre-calc the AND $80,x opcode + operand            
+            xba
+            sta     _OP_CACHE          ; This is the 2-byte opcode for to load the data
+
+            lda   TileStore+TS_CODE_ADDR_HIGH,x
+            pha
+            ldy   TileStore+TS_CODE_ADDR_LOW,x
+            plb
+
+            CopyDynUnder  0;$0003
+            CopyDynUnder  4;$1003
+            CopyDynUnder  8;$2003
+            CopyDynUnder  12;$3003
+            CopyDynUnder  16;$4003
+            CopyDynUnder  20;$5003
+            CopyDynUnder  24;$6003
+            CopyDynUnder  28;$7003
+
+            sec
+            lda     _JTBL_CACHE
+            sbc     #SNIPPET_SIZE
+            sta     _JTBL_CACHE
+
+            clc
+            lda     _OP_CACHE
+            adc     #$0200             ; Advance to the next word
+            sta     _OP_CACHE
+
+            CopyDynUnder  2;$0000
+            CopyDynUnder  6;$1000
+            CopyDynUnder  10;$2000
+            CopyDynUnder  14;$3000
+            CopyDynUnder  18;$4000
+            CopyDynUnder  22;$5000
+            CopyDynUnder  26;$6000
+            CopyDynUnder  30;$7000
+
+; Now fill in the JMP opcodes
+_DynFillJmpOpcode
+            sep   #$20
+            lda   #$4C
+            sta:  $0000,y
+            sta:  $0003,y
+            sta   $1000,y
+            sta   $1003,y
+            sta   $2000,y
+            sta   $2003,y
+            sta   $3000,y
+            sta   $3003,y
+            sta   $4000,y
+            sta   $4003,y
+            sta   $5000,y
+            sta   $5003,y
+            sta   $6000,y
+            sta   $6003,y
+            sta   $7000,y
+            sta   $7003,y
+            rep   #$20
+
+            plb
+            rts
+
+; Bank is already set to code field
+; Y register is the offset
+; X register is the TileStore
+; A is the tile address
+CopyDynamicTileTwoLyr
+
+            ldal  TileStore+TS_JMP_ADDR,x      ; Get the address of the exception handler
+            sta   _JTBL_CACHE
+
+            ldal  TileStore+TS_WORD_OFFSET,x
+            ora   #$B100                       ; Pre-calc the LDA (dp),y opcode + operand
+            xba
+            sta   _OP_CACHE
+
+; We need to do an AND dp|$80,x / ORA dp,x.  The opcode values are $35 and $15, respectively.
+; We pre-calculate the AND opcode with the high bit of the operand set and then, in the macro
+; perform and EOR #$2080 to covert the opcode and operand in one instruction
+
+            ldal  TileStore+TS_TILE_ID,x       ; Get the original tile descriptor
+            and   #$007F                       ; clamp to < (32 * 4)
+            ora   #$3580                       ; Pre-calc the AND $80,x opcode + operand
+            xba
+            sta   _OP_CACHE2                   ; This is an op to load the dynamic tile data
+
+            CopyMaskedDWord  $0003
+            CopyMaskedDWord  $1003
+            CopyMaskedDWord  $2003
+            CopyMaskedDWord  $3003
+            CopyMaskedDWord  $4003
+            CopyMaskedDWord  $5003
+            CopyMaskedDWord  $6003
+            CopyMaskedDWord  $7003
+
+            sec
+            lda     _JTBL_CACHE
+            sbc     #SNIPPET_SIZE      ; Advance to the next snippet (Reverse indexing)
+            sta     _JTBL_CACHE
+
+            clc
+            lda     _OP_CACHE
+            adc     #$0200             ; Advance to the next word
+            sta     _OP_CACHE
+
+            lda     _OP_CACHE2
+            adc     #$0200
+            sta     _OP_CACHE2
+
+            CopyMaskedDWord  $0000
+            CopyMaskedDWord  $1000
+            CopyMaskedDWord  $2000
+            CopyMaskedDWord  $3000
+            CopyMaskedDWord  $4000
+            CopyMaskedDWord  $5000
+            CopyMaskedDWord  $6000
+            CopyMaskedDWord  $7000
+
+            jmp   _DynFillJmpOpcode
+
+; Render a sprite on top of a dyamic tile with transparent areas shwing the second background
+DynamicOverTwoLyr
+            lda   TileStore+TS_JMP_ADDR,x      ; Get the address of the exception handler
+            sta   _JTBL_CACHE
+
+            lda   TileStore+TS_WORD_OFFSET,x
+            ora   #$B100                       ; Pre-calc the LDA (dp),y opcode + operand
+            xba
+            sta   _OP_CACHE
+
+; We need to do an AND dp|$80,x / ORA dp,x.  The opcode values are $35 and $15, respectively.
+; We pre-calculate the AND opcode with the high bit of the operand set and then, in the macro
+; perform and EOR #$2080 to covert the opcode and operand in one instruction
+
+            lda   TileStore+TS_TILE_ID,x       ; Get the original tile descriptor
+            and   #$007F                       ; clamp to < (32 * 4)
+            ora   #$3580                       ; Pre-calc the AND $80,x opcode + operand
+            xba
+            sta   _OP_CACHE2                   ; This is an op to load the dynamic tile data
+
+            lda   TileStore+TS_CODE_ADDR_HIGH,x
+            pha
+            ldy   TileStore+TS_CODE_ADDR_LOW,x
+            plb
+
+            CopyDynMaskedSpriteWord  0;$0003
+            CopyDynMaskedSpriteWord  4;$1003
+            CopyDynMaskedSpriteWord  8;$2003
+            CopyDynMaskedSpriteWord  12;$3003
+            CopyDynMaskedSpriteWord  16;$4003
+            CopyDynMaskedSpriteWord  20;$5003
+            CopyDynMaskedSpriteWord  24;$6003
+            CopyDynMaskedSpriteWord  28;$7003
+
+            sec
+            lda     _JTBL_CACHE
+            sbc     #SNIPPET_SIZE      ; Advance to the next snippet (Reverse indexing)
+            sta     _JTBL_CACHE
+
+            clc
+            lda     _OP_CACHE
+            adc     #$0200             ; Advance to the next word
+            sta     _OP_CACHE
+
+            lda     _OP_CACHE2
+            adc     #$0200             ; Advance to the next word
+            sta     _OP_CACHE2
+
+            CopyDynMaskedSpriteWord  2;$0000
+            CopyDynMaskedSpriteWord  6;$1000
+            CopyDynMaskedSpriteWord  10;$2000
+            CopyDynMaskedSpriteWord  14;$3000
+            CopyDynMaskedSpriteWord  18;$4000
+            CopyDynMaskedSpriteWord  22;$5000
+            CopyDynMaskedSpriteWord  26;$6000
+            CopyDynMaskedSpriteWord  30;$7000
+
+            plb
+            rts
+
+; Render a sprite on top of a dyamic tile with transparent areas shwing the second background
+DynamicUnderTwoLyr
+            lda   TileStore+TS_JMP_ADDR,x      ; Get the address of the exception handler
+            sta   _JTBL_CACHE
+
+            lda   TileStore+TS_WORD_OFFSET,x
+            ora   #$B100                       ; Pre-calc the LDA (dp),y opcode + operand
+            xba
+            sta   _OP_CACHE
+
+; We need to do an AND dp|$80,x / ORA dp,x.  The opcode values are $35 and $15, respectively.
+; We pre-calculate the AND opcode with the high bit of the operand set and then, in the macro
+; perform and EOR #$2080 to covert the opcode and operand in one instruction
+
+            lda   TileStore+TS_TILE_ID,x       ; Get the original tile descriptor
+            and   #$007F                       ; clamp to < (32 * 4)
+            ora   #$3580                       ; Pre-calc the AND $80,x opcode + operand
+            xba
+            sta   _OP_CACHE2                   ; This is an op to load the dynamic tile data
+
+            lda   TileStore+TS_CODE_ADDR_HIGH,x
+            pha
+            ldy   TileStore+TS_CODE_ADDR_LOW,x
+            plb
+
+            CopyDynPrioMaskedSpriteWord  0;$0003
+            CopyDynPrioMaskedSpriteWord  4;$1003
+            CopyDynPrioMaskedSpriteWord  8;$2003
+            CopyDynPrioMaskedSpriteWord  12;$3003
+            CopyDynPrioMaskedSpriteWord  16;$4003
+            CopyDynPrioMaskedSpriteWord  20;$5003
+            CopyDynPrioMaskedSpriteWord  24;$6003
+            CopyDynPrioMaskedSpriteWord  28;$7003
+
+            sec
+            lda     _JTBL_CACHE
+            sbc     #SNIPPET_SIZE      ; Advance to the next snippet (Reverse indexing)
+            sta     _JTBL_CACHE
+
+            clc
+            lda     _OP_CACHE
+            adc     #$0200             ; Advance to the next word
+            sta     _OP_CACHE
+
+            lda     _OP_CACHE2
+            adc     #$0200             ; Advance to the next word
+            sta     _OP_CACHE2
+
+            CopyDynPrioMaskedSpriteWord  2;$0000
+            CopyDynPrioMaskedSpriteWord  6;$1000
+            CopyDynPrioMaskedSpriteWord  10;$2000
+            CopyDynPrioMaskedSpriteWord  14;$3000
+            CopyDynPrioMaskedSpriteWord  18;$4000
+            CopyDynPrioMaskedSpriteWord  22;$5000
+            CopyDynPrioMaskedSpriteWord  26;$6000
+            CopyDynPrioMaskedSpriteWord  30;$7000
+
+            plb
+            rts
+
+
+; Create a masked render based on data in the direct page temporary buffer.
+;
+; If the MASK is $0000, then insert a PEA
+; If the MASK is $FFFF, then insert a LDA DP,x / PHA
+; If mixed, create a snippet of LDA DP,x / AND #MASK / ORA #DATA / PHA
+; 
+; ]1 : sprite buffer offset
+; ]2 : code field offset
+CopyDynOver mac
+            lda   tmp_sprite_mask+{]1}     ; load the mask value
+            bne   mixed          ; a non-zero value may be mixed
+
+; This is a solid word
+            lda   #$00F4         ; PEA instruction
+            sta:  ]2,y
+            lda   tmp_sprite_data+{]1}     ; load the sprite data
+            sta:  ]2+1,y         ; PEA operand
+            bra   next
+
+mixed       cmp   #$FFFF         ; All 1's in the mask is a fully transparent sprite word
+            beq   transparent
+
+            lda   #$004C         ; JMP to handler
+            sta:  {]2},y
+            lda   _JTBL_CACHE    ; Get the offset to the exception handler for this column
+            ora   #{]2&$7000}    ; adjust for the current row offset
+            sta:  {]2}+1,y
+            tax        ; This becomes the new address that we use to patch in
+
+            lda   _OP_CACHE       ; Get the LDA dp,x instruction for this column
+            sta:  $0000,x
+
+            lda   #$0029          ; AND #SPRITE_MASK
+            sta:  $0002,x
+            lda   tmp_sprite_mask+{]1}
+            sta:  $0003,x
+
+            lda   #$0009          ; ORA #SPRITE_DATA
+            sta:  $0005,x
+            lda   tmp_sprite_data+{]1}
+            sta:  $0006,x
+
+            lda   #$0D80          ; branch to the prologue (BRA *+15)
+            sta:  $0008,x
+            bra   next
+
+; This is a transparent word, so just show the dynamic data
+transparent
+            lda   #$4800          ; Put the PHA in the third byte
+            sta:  {]2}+1,y
+            lda   _OP_CACHE       ; Store the LDA dp,x instruction with operand
+            sta:  {]2},y
+next
+            <<<
+
+; Masked renderer for a dynamic tile on top of the sprite data.  There are no transparent vs
+; solid vs mixed considerations here.  This only sets the JMP address, setting the JMP opcodes
+; must happen elsewhere
+;
+; ]1 : sprite plane offset
+; ]2 : code field offset
+CopyDynUnder MAC
+
+; Need to fill in the first 9 bytes of the JMP handler with the following code sequence where
+; the data and mask from from the sprite plane
+;
+;            lda  #DATA
+;            and  $80,x
+;            ora  $00,x
+;            bra  *+16
+
+            lda   _JTBL_CACHE     ; Get the offset to the exception handler for this column
+            ora   #{]2&$7000}     ; adjust for the current row offset
+            sta:  {]2}+1,y
+            tax         ; This becomes the new address that we use to patch in
+
+            lda   #$00A9          ; LDA #DATA
+            sta:  $0000,x
+            lda   tmp_sprite_data+{]1}
+            sta:  $0001,x
+
+            lda   _OP_CACHE
+            sta:  $0003,x         ; AND $80,x
+            eor   #$8020          ; Switch the opcode to an ORA and remove the high bit of the operand
+            sta:  $0005,x         ; ORA $00,x
+
+            lda   #$0E80          ; branch to the prologue (BRA *+16)
+            sta:  $0007,x
+            eom
+
+; Masked renderer for a dynamic tile. What's interesting about this renderer is that the mask
+; value is not used directly, but simply indicates if we can use a LDA 0,x / PHA sequence,
+; a LDA (00),y / PHA, or a JMP to a blended render
+;
+; If a dynamic tile is animated, there is the possibility to create a special mask that marks
+; words of the tile that a front / back / mixed across all frames.
+;
+; ]1 : code field offset
+;
+; This macro does not set the opcode since they will all be JMP instructions, they can be 
+; filled more efficiently in a separate routine.
+CopyMaskedDWord MAC
+
+; Need to fill in the first 6 bytes of the JMP handler with the following code sequence
+;
+;            lda  (00),y
+;            and  $80,x
+;            ora  $00,x
+;            bra  *+17
+
+            lda   _JTBL_CACHE
+            ora   #{{]1}&$7000}     ; adjust for the current row offset
+            sta:  {]1}+1,y
+
+            tax                   ; This becomes the new address that we use to patch in
+            lda   _OP_CACHE
+            sta:  $0000,x         ; LDA (00),y
+            lda   _OP_CACHE2
+            sta:  $0002,x         ; AND $80,x
+            eor   #$8020          ; Switch the opcode to an ORA and remove the high bit of the operand
+            sta:  $0004,x         ; ORA $00,x
+            lda   #$0F80          ; branch to the prologue (BRA *+17)
+            sta:  $0006,x
+            eom
+
+
+; Masked renderer for a masked dynamic tile with sprite data overlaid.
+;
+; ]1 : sprite plane offset
+; ]2 : code field offset
+CopyDynMaskedSpriteWord MAC
+
+; Need to fill in the first 14 bytes of the JMP handler with the following code sequence where
+; the data and mask from from the sprite plane
+;
+;            lda  ($00),y
+;            and  $80,x
+;            ora  $00,x
+;            and  #MASK
+;            ora  #DATA
+;            bra  *+15
+;
+; If MASK == 0, then we can do a PEA.  If MASK == $FFFF, then fall back to the simple Dynamic Tile
+; code and eliminate the constanct AND/ORA instructions.
+
+            lda   tmp_sprite_mask+{]1}           ; load the mask value
+            bne   mixed                          ; a non-zero value may be mixed
+
+; This is a solid word
+            lda   #$00F4                         ; PEA instruction
+            sta:  {]2},y
+            lda   tmp_sprite_data+{]1}           ; load the sprite data
+            sta:  {]2}+1,y                       ; PEA operand
+            bra   next
+
+; We will always do a JMP to the exception handler, so set that up, then check for sprite
+; transparency
+mixed
+            lda   #$004C                         ; JMP to handler
+            sta:  {]2},y
+            lda   _JTBL_CACHE                    ; Get the offset to the exception handler for this column
+            ora   #{]2&$7000}                    ; adjust for the current row offset
+            sta:  {]2}+1,y
+            tax                                  ; This becomes the new address that we use to patch in
+
+            lda   _OP_CACHE
+            sta:  $0000,x                        ; LDA (00),y
+            lda   _OP_CACHE2
+            sta:  $0002,x                        ; AND $80,x
+            eor   #$8020                         ; Switch the opcode to an ORA and remove the high bit of the operand
+            sta:  $0004,x                        ; ORA $00,x
+
+            lda   #$0029                         ; AND #SPRITE_MASK
+            sta:  $0006,x
+            lda   tmp_sprite_mask+{]1} 
+            cmp   #$FFFF                         ; All 1's in the mask is a fully transparent sprite word
+            beq   transparent
+            sta:  $0007,x
+
+            lda   #$0009                         ; ORA #SPRITE_DATA
+            sta:  $0009,x
+            lda   tmp_sprite_data+{]1}
+            sta:  $000A,x
+
+            lda   #$0980                         ; branch to the prologue (BRA *+11)
+            sta:  $000C,x
+            bra   next
+
+; This is a transparent word, so just show the dynamic data
+transparent
+            lda   #$0F80                         ; branch to the epilogue (BRA *+17)
+            sta:  $0006,x
+next
+            eom
+
+
+; Masked renderer for a masked dynamic tile with sprite data underlaid.
+;
+; ]1 : sprite plane offset
+; ]2 : code field offset
+CopyDynPrioMaskedSpriteWord MAC
+
+; Need to fill in the first 14 bytes of the JMP handler with the following code sequence where
+; the data and mask from from the sprite plane
+;
+;            lda  ($00),y
+;            and  #MASK
+;            ora  #DATA
+;            and  $80,x
+;            ora  $00,x
+;            bra  *+15
+
+            lda   #$004C          ; JMP to handler
+            sta:  {]2},y
+            lda   _JTBL_CACHE     ; Get the offset to the exception handler for this column
+            ora   #{]2&$7000}     ; adjust for the current row offset
+            sta:  {]2}+1,y
+            tax                   ; This becomes the new address that we use to patch in
+
+            lda   _OP_CACHE
+            sta:  $0000,x         ; LDA (00),y
+
+            lda   #$0029          ; AND #SPRITE_MASK
+            sta:  $0002,x
+
+            lda   tmp_sprite_mask+{]1}
+            cmp   #$FFFF          ; All 1's in the mask is a fully transparent sprite word
+            beq   transparent     ; so we can use the Tile00011 method
+            sta:  $0003,x
+
+            lda   #$0009          ; ORA #SPRITE_DATA
+            sta:  $0005,x
+            lda   tmp_sprite_data+{]1}
+            sta:  $0006,x
+
+            lda   _OP_CACHE2
+            sta:  $0008,x         ; AND $80,x
+            eor   #$8020          ; Switch the opcode to an ORA and remove the high bit of the operand
+            sta:  $000A,x         ; ORA $00,x
+
+            lda   #$0980          ; branch to the prologue (BRA *+11)
+            sta:  $000C,x
+            bra   next
+
+; This is a transparent word, so just show the dynamic data
+transparent
+            lda   _OP_CACHE2
+            sta:  $0002,x         ; AND $80,x
+            eor   #$8020          ; Switch the opcode to an ORA and remove the high bit of the operand
+            sta:  $0004,x         ; ORA $00,x
+
+            lda   #$0F80          ; branch to the epilogue (BRA *+17)
+            sta:  $0006,x
+next
+            eom
+
+; Helper functions to move tile data into the dynamic tile space
+
+; Helper functions to copy tile data to the appropriate location in Bank 0
+;  X = tile ID
+;  Y = dynamic tile ID
+CopyTileToDyn 
+            txa
+            jsr   _GetTileAddr
+            tax
+
+            tya
+            and   #$001F        ; Maximum of 32 dynamic tiles
+            asl
+            asl                 ; 4 bytes per page
+            adc   BlitterDP               ; Add to the bank 00 base address
+            adc   #$0100        ; Go to the next page
+            tay
+            jsr   CopyTileDToDyn          ; Copy the tile data
+            jmp   CopyTileMToDyn          ; Copy the tile mask
+
+;  X = address of tile
+;  Y = tile address in bank 0
+CopyTileDToDyn
+            phb
+            pea   $0000
+            plb
+            plb
+
+            ldal  tiledata+0,x
+            sta:  $0000,y
+            ldal  tiledata+2,x
+            sta:  $0002,y
+            ldal  tiledata+4,x
+            sta   $0100,y
+            ldal  tiledata+6,x
+            sta   $0102,y
+            ldal  tiledata+8,x
+            sta   $0200,y
+            ldal  tiledata+10,x
+            sta   $0202,y
+            ldal  tiledata+12,x
+            sta   $0300,y
+            ldal  tiledata+14,x
+            sta   $0302,y
+            ldal  tiledata+16,x
+            sta   $0400,y
+            ldal  tiledata+18,x
+            sta   $0402,y
+            ldal  tiledata+20,x
+            sta   $0500,y
+            ldal  tiledata+22,x
+            sta   $0502,y
+            ldal  tiledata+24,x
+            sta   $0600,y
+            ldal  tiledata+26,x
+            sta   $0602,y
+            ldal  tiledata+28,x
+            sta   $0700,y
+            ldal  tiledata+30,x
+            sta   $0702,y
+
+            plb
+            rts
+
+; Helper function to copy tile mask to the appropriate location in Bank 0
+;
+;  X = address of tile
+;  Y = tile address in bank 0
+;
+; Argument are the same as CopyTileDToDyn, the code takes care of adjust offsets.
+; This make is possible to call the two functions back-to-back
+;
+;   ldx tileAddr
+;   ldy dynTileAddr
+;   jsr CopyTileDToDyn
+;   jsr CopyTileMToDyn
+CopyTileMToDyn
+            phb
+            pea   $0000
+            plb
+            plb
+
+            ldal  tiledata+32+0,x
+            sta:  $0080,y
+            ldal  tiledata+32+2,x
+            sta:  $0082,y
+            ldal  tiledata+32+4,x
+            sta   $0180,y
+            ldal  tiledata+32+6,x
+            sta   $0182,y
+            ldal  tiledata+32+8,x
+            sta   $0280,y
+            ldal  tiledata+32+10,x
+            sta   $0282,y
+            ldal  tiledata+32+12,x
+            sta   $0380,y
+            ldal  tiledata+32+14,x
+            sta   $0382,y
+            ldal  tiledata+32+16,x
+            sta   $0480,y
+            ldal  tiledata+32+18,x
+            sta   $0482,y
+            ldal  tiledata+32+20,x
+            sta   $0580,y
+            ldal  tiledata+32+22,x
+            sta   $0582,y
+            ldal  tiledata+32+24,x
+            sta   $0680,y
+            ldal  tiledata+32+26,x
+            sta   $0682,y
+            ldal  tiledata+32+28,x
+            sta   $0780,y
+            ldal  tiledata+32+30,x
+            sta   $0782,y
+
+            plb
+            rts
\ No newline at end of file
diff --git a/src/render/Fast.s b/src/render/Fast.s
new file mode 100644
index 0000000..da51d13
--- /dev/null
+++ b/src/render/Fast.s
@@ -0,0 +1,258 @@
+; Collection of render function used when the engine is in "FAST" mode.  In this mode
+; there are no dynamic tile or two layer tiles enabled, so all of the tiles are comprised
+; of PEA opcodes.  These functions take advantage of this as the fact that masks are
+; not needed to improve rendering speed.
+
+ConstTile0Fast
+            lda   #0
+            sta:  $0001,y
+            sta:  $0004,y
+            sta   $1001,y
+            sta   $1004,y
+            sta   $2001,y
+            sta   $2004,y
+            sta   $3001,y
+            sta   $3004,y
+            sta   $4001,y
+            sta   $4004,y
+            sta   $5001,y
+            sta   $5004,y
+            sta   $6001,y
+            sta   $6004,y
+            sta   $7001,y
+            sta   $7004,y
+            plb
+            rts
+
+SpriteOverAFast
+            lda   TileStore+TS_CODE_ADDR_HIGH,x    ; load the bank of the target code field line
+            pha                                    ; and put on the stack for later. Has TileStore bank in high byte.
+            ldy   TileStore+TS_CODE_ADDR_LOW,x     ; load the address of the code field
+            lda   TileStore+TS_TILE_ADDR,x
+            tax
+            plb
+
+_SpriteOverAFast                                   ; Alternate entry point for the "Slow" routines
+]line       equ   0
+            lup   8
+            ldal  tiledata+{]line*4},x
+            and   tmp_sprite_mask+{]line*4}
+            ora   tmp_sprite_data+{]line*4}
+            sta:  $0004+{]line*$1000},y
+
+            ldal  tiledata+{]line*4}+2,x
+            and   tmp_sprite_mask+{]line*4}+2
+            ora   tmp_sprite_data+{]line*4}+2
+            sta:  $0001+{]line*$1000},y
+]line       equ   ]line+1
+            --^
+
+            plb
+            rts
+
+SpriteOverVFast
+            lda   TileStore+TS_CODE_ADDR_HIGH,x    ; load the bank of the target code field line
+            pha                                    ; and put on the stack for later. Has TileStore bank in high byte.
+            ldy   TileStore+TS_CODE_ADDR_LOW,x     ; load the address of the code field
+            lda   TileStore+TS_TILE_ADDR,x
+            tax
+            plb
+
+_SpriteOverVFast
+]src        equ   7
+]dest       equ   0
+            lup   8
+            ldal  tiledata+{]src*4},x
+            and   tmp_sprite_mask+{]dest*4}
+            ora   tmp_sprite_data+{]dest*4}
+            sta:  $0004+{]dest*$1000},y
+
+            ldal  tiledata+{]src*4}+2,x
+            and   tmp_sprite_mask+{]dest*4}+2
+            ora   tmp_sprite_data+{]dest*4}+2
+            sta:  $0001+{]dest*$1000},y
+]src        equ   ]src-1
+]dest       equ   ]dest+1
+            --^
+            plb
+            rts
+
+SpriteOver0Fast
+            lda   TileStore+TS_CODE_ADDR_HIGH,x    ; load the bank of the target code field line
+            pha                                    ; and put on the stack for later. Has TileStore bank in high byte.
+            ldy   TileStore+TS_CODE_ADDR_LOW,x     ; load the address of the code field
+            plb
+
+_SpriteOver0Fast
+]line       equ   0
+            lup   8
+            lda   tmp_sprite_data+{]line*4}
+            sta:  $0004+{]line*$1000},y
+
+            lda   tmp_sprite_data+{]line*4}+2
+            sta:  $0001+{]line*$1000},y
+]line       equ   ]line+1
+            --^
+
+            plb
+            rts
+
+SpriteUnderAFast
+            lda   TileStore+TS_CODE_ADDR_HIGH,x    ; load the bank of the target code field line
+            pha                                    ; and put on the stack for later. Has TileStore bank in high byte.
+            ldy   TileStore+TS_CODE_ADDR_LOW,x     ; load the address of the code field
+            lda   TileStore+TS_TILE_ADDR,x
+            tax
+            plb
+
+_SpriteUnderAFast
+]line       equ   0
+            lup   8
+            lda   tmp_sprite_data+{]line*4}
+            andl  tiledata+{]line*4}+32,x
+            oral  tiledata+{]line*4},x
+            sta:  $0004+{]line*$1000},y
+
+            lda   tmp_sprite_data+{]line*4}+2
+            andl  tiledata+{]line*4}+32+2,x
+            oral  tiledata+{]line*4}+2,x
+            sta:  $0001+{]line*$1000},y
+]line       equ   ]line+1
+            --^
+
+            plb
+            rts
+
+SpriteUnderVFast
+            lda   TileStore+TS_CODE_ADDR_HIGH,x    ; load the bank of the target code field line
+            pha                                    ; and put on the stack for later. Has TileStore bank in high byte.
+            ldy   TileStore+TS_CODE_ADDR_LOW,x     ; load the address of the code field
+            lda   TileStore+TS_TILE_ADDR,x
+            tax
+            plb
+
+_SpriteUnderVFast
+]src        equ   7
+]dest       equ   0
+            lup   8
+            lda   tmp_sprite_data+{]dest*4}
+            andl  tiledata+{]src*4}+32,x
+            oral  tiledata+{]src*4},x
+            sta:  $0004+{]dest*$1000},y
+
+            lda   tmp_sprite_data+{]dest*4}+2
+            andl  tiledata+{]src*4}+32+2,x
+            oral  tiledata+{]src*4}+2,x
+            sta:  $0001+{]dest*$1000},y
+]src        equ   ]src-1
+]dest       equ   ]dest+1
+            --^
+
+            plb
+            rts
+
+SpriteUnder0Fast
+            lda   TileStore+TS_CODE_ADDR_HIGH,x    ; load the bank of the target code field line
+            pha                                    ; and put on the stack for later. Has TileStore bank in high byte.
+            ldy   TileStore+TS_CODE_ADDR_LOW,x     ; load the address of the code field
+            plb
+
+_SpriteUnder0Fast
+            lda   #0
+]line       equ   0
+            lup   8
+            sta:  $0004+{]line*$1000},y
+            sta:  $0001+{]line*$1000},y
+]line       equ   ]line+1
+            --^
+
+            plb
+            rts
+
+; Simple pair of routines that copies just the tile data to the direct page workspace.  Data Bank
+; must be set to the TileData bank in entry.
+;
+; Preserves the X-register
+FastCopyTileDataA
+            ldy   TileStore+TS_TILE_ADDR,x         ; load the tile address
+            pei   DP2_TILEDATA_AND_TILESTORE_BANKS
+            plb                                    ; set to the tiledata bank
+
+]line       equ   0
+            lup   8
+            lda   tiledata+{]line*4},y
+            sta   tmp_tile_data+{]line*4}
+
+            lda   tiledata+{]line*4}+2,y
+            sta   tmp_tile_data+{]line*4}+2
+]line       equ   ]line+1
+            --^
+
+            plb
+            rts
+
+FastCopyTileDataV
+            ldy   TileStore+TS_TILE_ADDR,x         ; load the tile address
+            pei   DP2_TILEDATA_AND_TILESTORE_BANKS
+            plb                                    ; set to the tiledata bank
+
+]src        equ   7
+]dest       equ   0
+            lup   8
+            lda   tiledata+{]src*4},y
+            sta   tmp_tile_data+{]dest*4}
+
+            lda   tiledata+{]src*4}+2,y
+            sta   tmp_tile_data+{]dest*4}+2
+]src        equ   ]src-1
+]dest       equ   ]dest+1
+            --^
+            
+            plb
+            rts
+
+FastCopyTileDataAndMaskA
+            ldy   TileStore+TS_TILE_ADDR,x         ; load the tile address
+            pei   DP2_TILEDATA_AND_TILESTORE_BANKS
+            plb                                    ; set to the tiledata bank
+
+]line       equ   0
+            lup   8
+            lda   tiledata+{]line*4},y
+            sta   tmp_tile_data+{]line*4}
+            lda   tiledata+{]line*4}+32,y
+            sta   tmp_tile_mask+{]line*4}
+
+            lda   tiledata+{]line*4}+2,y
+            sta   tmp_tile_data+{]line*4}+2
+            lda   tiledata+{]line*4}+32+2,y
+            sta   tmp_tile_mask+{]line*4}+2
+]line       equ   ]line+1
+            --^
+
+            plb
+            rts
+
+FastCopyTileDataAndMaskV
+            ldy   TileStore+TS_TILE_ADDR,x         ; load the tile address
+            pei   DP2_TILEDATA_AND_TILESTORE_BANKS
+            plb                                    ; set to the tiledata bank
+
+]src        equ   7
+]dest       equ   0
+            lup   8
+            lda   tiledata+{]src*4},y
+            sta   tmp_tile_data+{]dest*4}
+            lda   tiledata+{]src*4}+32,y
+            sta   tmp_tile_mask+{]dest*4}
+
+            lda   tiledata+{]src*4}+2,y
+            sta   tmp_tile_data+{]dest*4}+2
+            lda   tiledata+{]src*4}+32+2,y
+            sta   tmp_tile_mask+{]dest*4}+2
+]src        equ   ]src-1
+]dest       equ   ]dest+1
+            --^
+            
+            plb
+            rts
diff --git a/src/render/README.txt b/src/render/README.txt
new file mode 100644
index 0000000..0dbffdf
--- /dev/null
+++ b/src/render/README.txt
@@ -0,0 +1,83 @@
+This folder contains the rendering tuples for the different type of tile rendering modes
+that are defined by both the engine mode and the specific tile attributes.  There are
+a *lot* or variants, so they are cataloged here.
+
+The top-level TileRender function in the main entry point that defined the overal tile render
+flow as well as the register parameters and calling conventions for each of the modular 
+components.
+
+There are 5 pluggable functions that make up a rendering mode
+
+1. K_TS_BASE_TILE_DISP
+
+   An address to a function that will render a tile into the code field.  There are no
+   sprites to handle in this case.
+
+   Arguments:
+     A: TileData/TileMask address
+     B: code field bank
+     Y: address of the tile in the code bank
+     X: TileStore offset
+
+   Return:
+     None
+
+   If additional TileStore properties are needed for the renderer, they can be read using the X
+   register.
+
+2. K_TS_SPRITE_TILE_DISP
+
+   Selects the top-level handler for rendering a tile with a sprite.  Currently, this is used to
+   select between rendering a sprite above the tile, or under the tile based on the value of the
+   TILE_PRIORITY_BIT.
+
+    Arguments:
+     A: TileStore+TS_SPRITE_FLAG
+     X: TileStore offset
+
+    Return:
+     Y: TileStore offset
+     sprite_ptrX dirct page values set to the sprite VBuff addresses
+
+   The handler routine is responsible for examining the TS_SPRITE_FLAG value and dispatching
+   to an appropriate routine to handle the number of sprites intersecting the tile.
+
+3. K_TS_ONE_SPRITE
+
+   A specialized routine when K_TS_SPRITE_TILE_DISP determines there is only one sprite to render
+   it MUST dispatch to this function.  The K_TS_ONE_SPRITE routine MAY make use of the K_TS_COPY_TILE_DATA
+   and K_TS_APPLY_TILE_DATA functions, but is not required to do so.
+
+4. K_TS_COPY_TILE_DATA & K_TS_APPLY_TILE_DATA
+
+   A pair of function that copye tile data (and possible mask information) into a temporary
+   direct page space and then render that workspace into the code field.
+
+   These functions are used as building blocks by the generic Over/Under multi-sprite
+   rendering code.
+
+   K_TS_COPY_TILE_DATA
+     Arguments:
+      B: Set to the TileData bank
+      Y: Set to the tile address
+     Return:
+      X: preserve the X register
+
+   K_TS_APPLY_TILE_DATA
+     Arguments:
+        B: code field bank
+        Y: address of the tile in the code bank
+     Return:
+        None
+
+
+
+Generic Flow
+
+  1. Is there a sprite?
+     No -> Call K_TS_BASE_TILE_DISP to render a tile into the code field
+
+     Yes -> Call K_TS_SPRITE_TILE_DISP
+
+      Over  : Copy tile data + mask to DP, Copy sprite data + mask to DP, render tile to code field
+      Under : Copy sprite data to DP, 
\ No newline at end of file
diff --git a/src/render/Render.s b/src/render/Render.s
new file mode 100644
index 0000000..82f311a
--- /dev/null
+++ b/src/render/Render.s
@@ -0,0 +1,86 @@
+; If there are no sprites, then we copy the tile data into the code field as fast as possible.
+; If there are sprites, then additional work is required
+_RenderTile
+            lda   TileStore+TS_SPRITE_FLAG,x       ; any sprites on this line?
+            bne   :sprites
+
+            lda   TileStore+TS_CODE_ADDR_HIGH,x    ; load the bank of the target code field line
+            pha                                    ; and put on the stack for later. Has TileStore bank in high byte.
+            ldy   TileStore+TS_CODE_ADDR_LOW,x     ; load the address of the code field
+            lda   TileStore+TS_TILE_ADDR,x         ; load the address of this tile's data (pre-calculated)
+            plb                                    ; set the code field bank
+            jmp   (K_TS_BASE_TILE_DISP,x)          ; go to the tile copy routine
+
+; Execute the sprite tree.  If there is only one sprite, control will immediately be passed to
+; the routine at K_TS_ONE_SPRITE.  Otherwise, the control passed to the routines with a different
+; number of sprites.  These routines need to copy the flattened sprite data and mask into the
+; direct page workspace to be used by the K_TS_SPRITE_TILE_DISP routine
+:sprites    txy
+            SpriteBitsToVBuffAddrs $0000;TwoSprites;ThreeSprites;FourSprites
+
+; Dispatch vectors for the two, three and four sprite functions.  These just
+; flatten the sprite data into the direct page workspace and then pass control
+; to the configurable routine which is set in SetTile and knows what to do
+; based on the tile properties (over/under, engine mode, etc.)
+;
+; NOTE: Could pull the CopyXXXSprites function inline and same the 3 cycles for the JMP,
+;       - or - put the TYX into the macro and jump directly from there.
+TwoSprites  tyx
+            jmp   CopyTwoSpritesDataAndMaskToDP
+
+ThreeSprites tyx
+            jmp   CopyThreeSpritesDataAndMaskToDP
+
+FourSprites tyx
+            jmp   CopyFourSpritesDataAndMaskToDP
+
+; Now, implement the generic Two, Three and Four sprite routines for both Over and Under rendering. These
+; are fairly involved, so we try to only have a single implementation of them for now without excessve
+; specialization.
+
+
+FourSpriteLine mac
+;            and   [sprite_ptr3],y
+            db    $37,sprite_ptr3
+            ora   (sprite_ptr3),y
+;            and   [sprite_ptr2],y
+            db    $37,sprite_ptr2
+            ora   (sprite_ptr2),y
+;            and   [sprite_ptr1],y
+            db    $37,sprite_ptr1
+            ora   (sprite_ptr1),y
+;            and   [sprite_ptr0],y
+            db    $37,sprite_ptr0
+            ora   (sprite_ptr0),y
+            <<<
+
+FourSpritesFast
+            tyx                                    ; save for after compositing the sprites
+
+            ldy   TileStore+TS_TILE_ADDR,x
+            pei   DP2_TILEDATA_AND_TILESTORE_BANKS
+            plb
+            jsr   (K_TS_COPY_TILE_DATA,x)
+            plb
+
+            pei   DP2_SPRITEDATA_AND_TILESTORE_BANKS 
+            plb                                    ; set the sprite data bank
+
+]line       equ   0
+            lup   8
+            ldy   #{]line*SPRITE_PLANE_SPAN}
+            lda   tmp_tile_data+{]line*4}
+            FourSpriteLine
+            sta   tmp_tile_data+{]line*4}
+
+            ldy   #{]line*SPRITE_PLANE_SPAN}+2
+            lda   tmp_tile_data+{]line*4}+2
+            FourSpriteLine
+            sta   tmp_tile_data+{]line*4}+2
+]line       equ   ]line+1
+            --^
+
+            plb
+            jmp   (K_TS_APPLY_TILE_DATA,x)
+
+
diff --git a/src/render/Slow.s b/src/render/Slow.s
new file mode 100644
index 0000000..ff833f1
--- /dev/null
+++ b/src/render/Slow.s
@@ -0,0 +1,86 @@
+; Identical routines to those in Fast.s, but also set the opcode.  Used to render solid
+; tiles when the engine mode has other capabilities turned on
+;
+; The following functions are defined here
+;
+; GenericOverSlow  : Places data from tmp_sprite_data on top of the TileStore's tile
+; GenericUnderSlow : Places the TileStore's tile on top of tmp_sprite_data
+
+ConstTile0Slow
+            jsr   FillPEAOpcode
+            jmp   ConstTile0Fast
+
+SpriteOverASlow
+            lda   TileStore+TS_CODE_ADDR_HIGH,x    ; load the bank of the target code field line
+            pha                                    ; and put on the stack for later. Has TileStore bank in high byte.
+            ldy   TileStore+TS_CODE_ADDR_LOW,x     ; load the address of the code field
+            lda   TileStore+TS_TILE_ADDR,x
+            tax
+            plb
+            jsr   FillPEAOpcode
+            jmp   _SpriteOverAFast
+
+SpriteOverVSlow
+            lda   TileStore+TS_CODE_ADDR_HIGH,x    ; load the bank of the target code field line
+            pha                                    ; and put on the stack for later. Has TileStore bank in high byte.
+            ldy   TileStore+TS_CODE_ADDR_LOW,x     ; load the address of the code field
+            lda   TileStore+TS_TILE_ADDR,x
+            tax
+            plb
+            jsr   FillPEAOpcode
+            jmp   _SpriteOverVFast
+
+SpriteOver0Slow
+            lda   TileStore+TS_CODE_ADDR_HIGH,x    ; load the bank of the target code field line
+            pha                                    ; and put on the stack for later. Has TileStore bank in high byte.
+            ldy   TileStore+TS_CODE_ADDR_LOW,x     ; load the address of the code field
+            plb
+            jsr   FillPEAOpcode
+            jmp   _SpriteOver0Fast
+
+SpriteUnderASlow
+            lda   TileStore+TS_CODE_ADDR_HIGH,x    ; load the bank of the target code field line
+            pha                                    ; and put on the stack for later. Has TileStore bank in high byte.
+            ldy   TileStore+TS_CODE_ADDR_LOW,x     ; load the address of the code field
+            lda   TileStore+TS_TILE_ADDR,x
+            tax
+            plb
+            jsr   FillPEAOpcode
+            jmp   _SpriteUnderAFast
+
+SpriteUnderVSlow
+            lda   TileStore+TS_CODE_ADDR_HIGH,x    ; load the bank of the target code field line
+            pha                                    ; and put on the stack for later. Has TileStore bank in high byte.
+            ldy   TileStore+TS_CODE_ADDR_LOW,x     ; load the address of the code field
+            lda   TileStore+TS_TILE_ADDR,x
+            tax
+            plb
+            jsr   FillPEAOpcode
+            jmp   _SpriteUnderVFast
+
+SpriteUnder0Slow
+            lda   TileStore+TS_CODE_ADDR_HIGH,x    ; load the bank of the target code field line
+            pha                                    ; and put on the stack for later. Has TileStore bank in high byte.
+            ldy   TileStore+TS_CODE_ADDR_LOW,x     ; load the address of the code field
+            plb
+            jsr   FillPEAOpcode
+            jmp   _SpriteUnder0Fast
+
+; Helper function; no stack manipulation
+FillPEAOpcode
+            sep   #$20
+            lda   #$F4
+]line       equ   0
+            lup   8
+            sta:  $0000+{]line*$1000},y
+            sta:  $0003+{]line*$1000},y
+]line       equ   ]line+1
+            --^
+            rep   #$20
+            rts
+
+; This is a stub; will be removed eventually
+_FillPEAOpcode
+            jsr   FillPEAOpcode
+            plb                                    ; Restore the TileStore bank
+            rts
\ No newline at end of file
diff --git a/src/render/Sprite1.s b/src/render/Sprite1.s
new file mode 100644
index 0000000..e976865
--- /dev/null
+++ b/src/render/Sprite1.s
@@ -0,0 +1,265 @@
+; Specialized routines that can be assigned to K_TS_ONE_SPRITE for rendering a single sprite into
+; a tile. There are more variants of this function because having a single sprite in a tile is a very
+; common scenario, so we put additional effort into optimizing this case.
+
+;------------------------------
+; Section: Above Tile Renderers
+
+; The simplest implementation.  When drawing a sprite over Tile 0 in FAST mode, we can just copy the
+; sprite data into the coe field directly.
+
+OneSpriteFastOver0
+            ldy   TileStore+TS_CODE_ADDR_HIGH,x    ; load the bank of the target code field line
+            phy                                    ; and put on the stack for later. Has TileStore bank in high byte.
+            ldy   TileStore+TS_CODE_ADDR_LOW,x     ; load the address of the code field
+            tax                                    ; VBuff address from SpriteBitsToVBuffAddrs macro
+            plb                                    ; set to the code field bank
+
+_OneSpriteFastOver0
+]line       equ   0
+            lup   8
+            ldal  spritedata+{]line*SPRITE_PLANE_SPAN},x
+            sta:  $0004+{]line*$1000},y
+            ldal  spritedata+{]line*SPRITE_PLANE_SPAN}+2,x
+            sta:  $0001+{]line*$1000},y
+]line       equ   ]line+1
+            --^
+
+            plb                                    ; Restore the TileStore bank
+            rts
+
+; Next implementation; drawing a sprite onto a regular tile. The 1-sprite dispatch preserves the
+; X-register, so it already points to the TileStore
+
+OneSpriteFastOverV
+            jsr   FastCopyTileDataV
+            bra   _OneSpriteFastOver
+
+OneSpriteFastOverA
+            jsr   FastCopyTileDataA
+
+_OneSpriteFastOver
+            lda   TileStore+TS_CODE_ADDR_HIGH,x    ; load the bank of the target code field line
+            pha                                    ; and put on the stack for later. Has TileStore bank in high byte.
+            ldy   TileStore+TS_CODE_ADDR_LOW,x     ; load the address of the code field
+            ldx   sprite_ptr0
+            plb
+
+_OneSpriteFastOverA
+_OneSpriteFastOverV
+]line       equ   0
+            lup   8
+            lda   tmp_tile_data+{]line*4}
+            andl  spritemask+{]line*SPRITE_PLANE_SPAN},x
+            oral  spritedata+{]line*SPRITE_PLANE_SPAN},x
+            sta:  $0004+{]line*$1000},y
+
+            lda   tmp_tile_data+{]line*4}+2
+            andl  spritemask+{]line*SPRITE_PLANE_SPAN}+2,x
+            oral  spritedata+{]line*SPRITE_PLANE_SPAN}+2,x
+            sta:  $0001+{]line*$1000},y
+]line       equ   ]line+1
+            --^
+            plb
+            rts
+
+; This is the "SLOW" variant that fills in the PEA opcode specialized for Tile 0.
+
+OneSpriteSlowOver0
+            ldy   TileStore+TS_CODE_ADDR_HIGH,x    ; load the bank of the target code field line
+            phy                                    ; and put on the stack for later. Has TileStore bank in high byte.
+            ldy   TileStore+TS_CODE_ADDR_LOW,x     ; load the address of the code field
+            tax                                    ; VBuff address from SpriteBitsToVBuffAddrs macro
+            plb                                    ; set to the code field bank
+            jsr   FillPEAOpcode
+            jmp   _OneSpriteFastOver0
+
+; Slow variant for regular tile.
+OneSpriteSlowOverV
+            jsr   FastCopyTileDataV
+            lda   TileStore+TS_CODE_ADDR_HIGH,x    ; load the bank of the target code field line
+            pha                                    ; and put on the stack for later. Has TileStore bank in high byte.
+            ldy   TileStore+TS_CODE_ADDR_LOW,x     ; load the address of the code field
+            ldx   sprite_ptr0
+            plb
+            jsr   FillPEAOpcode
+            jmp   _OneSpriteFastOverV
+
+OneSpriteSlowOverA
+            jsr   FastCopyTileDataA
+            lda   TileStore+TS_CODE_ADDR_HIGH,x    ; load the bank of the target code field line
+            pha                                    ; and put on the stack for later. Has TileStore bank in high byte.
+            ldy   TileStore+TS_CODE_ADDR_LOW,x     ; load the address of the code field
+            ldx   sprite_ptr0
+            plb
+            jsr   FillPEAOpcode
+            jmp   _OneSpriteFastOverA
+
+;------------------------------
+; Section: Below Tile Renderers
+
+; Drawing under the zero tile is the same as not drawing a sprite fo both the fast and slow cases
+OneSpriteFastUnderA
+            jsr   FastCopyTileDataAndMaskA
+            bra   _OneSpriteFastUnder
+
+OneSpriteFastUnderV
+            jsr   FastCopyTileDataAndMaskV
+
+_OneSpriteFastUnder
+            lda   TileStore+TS_CODE_ADDR_HIGH,x    ; load the bank of the target code field line
+            pha                                    ; and put on the stack for later. Has TileStore bank in high byte.
+            ldy   TileStore+TS_CODE_ADDR_LOW,x     ; load the address of the code field
+            ldx   sprite_ptr0
+            plb
+
+_OneSpriteFastUnderA
+_OneSpriteFastUnderV
+]line       equ   0
+            lup   8
+            ldal  spritedata+{]line*SPRITE_PLANE_SPAN},x
+            and   tmp_tile_mask+{]line*4}
+            ora   tmp_tile_data+{]line*4}
+            sta:  $0004+{]line*$1000},y
+
+            ldal  spritedata+{]line*SPRITE_PLANE_SPAN}+2,x
+            and   tmp_tile_mask+{]line*4}+2
+            ora   tmp_tile_data+{]line*4}+2
+            sta:  $0001+{]line*$1000},y
+]line       equ   ]line+1
+            --^
+
+            plb
+            rts
+
+OneSpriteSlowUnderA
+            jsr   FastCopyTileDataAndMaskA
+            lda   TileStore+TS_CODE_ADDR_HIGH,x    ; load the bank of the target code field line
+            pha                                    ; and put on the stack for later. Has TileStore bank in high byte.
+            ldy   TileStore+TS_CODE_ADDR_LOW,x     ; load the address of the code field
+            ldx   sprite_ptr0
+            plb
+            jsr   FillPEAOpcode
+            jmp   _OneSpriteFastUnderA
+
+OneSpriteSlowUnderV
+            jsr   FastCopyTileDataAndMaskV
+            lda   TileStore+TS_CODE_ADDR_HIGH,x    ; load the bank of the target code field line
+            pha                                    ; and put on the stack for later. Has TileStore bank in high byte.
+            ldy   TileStore+TS_CODE_ADDR_LOW,x     ; load the address of the code field
+            ldx   sprite_ptr0
+            plb
+            jsr   FillPEAOpcode
+            jmp   _OneSpriteFastUnderV
+
+;-------------------------------
+; Dynamic tiles with one sprite.
+
+OneSpriteDynamicUnder
+            txy
+            tax
+            jsr   _CopySpriteDataToDP
+            tyx
+            jmp   DynamicUnder
+
+OneSpriteDynamicOver
+            txy
+            tax
+            jsr   _CopySpriteDataAndMaskToDP
+            tyx
+            jmp   DynamicOver
+
+
+;-------------------------------
+; Two Layer tiles with one sprite. Just copy the data and go through the generic sprite path
+OneSpriteOver0TwoLyr
+            txy
+            tax
+            jsr   _CopySpriteDataAndMaskToDP
+            tyx
+            jmp   SpriteOver0TwoLyr
+
+OneSpriteTwoLyrOverA
+            txy
+            tax
+            jsr   _CopySpriteDataAndMaskToDP
+            tyx
+            jmp   SpriteOverATwoLyr
+
+OneSpriteTwoLyrOverV
+            txy
+            tax
+            jsr   _CopySpriteDataAndMaskToDP
+            tyx
+            jmp   SpriteOverVTwoLyr
+
+OneSpriteTwoLyrUnderA
+            txy
+            tax
+            jsr   _CopySpriteDataAndMaskToDP
+            tyx
+            jmp   SpriteUnderATwoLyr
+
+OneSpriteTwoLyrUnderV
+            txy
+            tax
+            jsr   _CopySpriteDataAndMaskToDP
+            tyx
+            jmp   SpriteUnderVTwoLyr
+
+;-----------------------------------------
+; Dynamic two-layer tiles with one sprite.
+
+OneSpriteDynamicOverTwoLyr
+            txy
+            tax
+            jsr   _CopySpriteDataAndMaskToDP
+            tyx
+            jmp   DynamicOverTwoLyr
+
+OneSpriteDynamicUnderTwoLyr
+            txy
+            tax
+            jsr   _CopySpriteDataAndMaskToDP
+            tyx
+            jmp   DynamicUnderTwoLyr
+
+;-------------------------------------
+; Generic helpers
+_CopySpriteDataToDP
+]line       equ   0
+            lup   8
+            ldal  spritedata+{]line*SPRITE_PLANE_SPAN},x
+            sta   tmp_sprite_data+{]line*4}
+            ldal  spritedata+{]line*SPRITE_PLANE_SPAN}+2,x
+            sta   tmp_sprite_data+{]line*4}+2
+]line       equ   ]line+1
+            --^
+            rts
+
+_CopySpriteMaskToDP
+]line       equ   0
+            lup   8
+            ldal  spritemask+{]line*SPRITE_PLANE_SPAN},x
+            sta   tmp_sprite_mask+{]line*4}
+            ldal  spritemask+{]line*SPRITE_PLANE_SPAN}+2,x
+            sta   tmp_sprite_mask+{]line*4}+2
+]line       equ   ]line+1
+            --^
+            rts
+
+_CopySpriteDataAndMaskToDP
+]line       equ   0
+            lup   8
+            ldal  spritedata+{]line*SPRITE_PLANE_SPAN},x
+            sta   tmp_sprite_data+{]line*4}
+            ldal  spritedata+{]line*SPRITE_PLANE_SPAN}+2,x
+            sta   tmp_sprite_data+{]line*4}+2
+
+            ldal  spritemask+{]line*SPRITE_PLANE_SPAN},x
+            sta   tmp_sprite_mask+{]line*4}
+            ldal  spritemask+{]line*SPRITE_PLANE_SPAN}+2,x
+            sta   tmp_sprite_mask+{]line*4}+2
+]line       equ   ]line+1
+            --^
+            rts
diff --git a/src/render/Sprite2.s b/src/render/Sprite2.s
new file mode 100644
index 0000000..452beec
--- /dev/null
+++ b/src/render/Sprite2.s
@@ -0,0 +1,37 @@
+; Specialize routines for handling two sprites.
+TwoSpriteData mac
+            lda   (sprite_ptr1),y
+            db    $37,sprite_ptr0                  ; and   [sprite_ptr0],y
+            ora   (sprite_ptr0),y
+            <<<
+
+TwoSpriteMask mac
+            db    $B7,sprite_ptr1                  ; lda   [sprite_ptr1],y
+            db    $37,sprite_ptr0                  ; and   [sprite_ptr0],y
+            <<<
+
+CopyFourSpritesDataAndMaskToDP
+CopyThreeSpritesDataAndMaskToDP
+CopyTwoSpritesDataAndMaskToDP
+            pei   DP2_SPRITEDATA_AND_TILESTORE_BANKS
+            plb
+
+]line       equ   0
+            lup   8
+            ldy   #{]line*SPRITE_PLANE_SPAN}
+            TwoSpriteData
+            sta   tmp_sprite_data+{]line*4}
+            TwoSpriteMask
+            sta   tmp_sprite_mask+{]line*4}
+
+            ldy   #{]line*SPRITE_PLANE_SPAN}+2
+            TwoSpriteData
+            sta   tmp_sprite_data+{]line*4}+2
+            TwoSpriteMask
+            sta   tmp_sprite_mask+{]line*4}+2
+]line       equ   ]line+1
+            --^
+
+            plb
+            jmp   (K_TS_SPRITE_TILE_DISP,x)
+
diff --git a/src/render/Sprite3.s b/src/render/Sprite3.s
new file mode 100644
index 0000000..e69de29
diff --git a/src/render/Sprite4.s b/src/render/Sprite4.s
new file mode 100644
index 0000000..e69de29
diff --git a/src/render/TwoLayer.s b/src/render/TwoLayer.s
new file mode 100644
index 0000000..8ca2df6
--- /dev/null
+++ b/src/render/TwoLayer.s
@@ -0,0 +1,376 @@
+; Collection of render function used when the engine is in "Two Layer" mode. Other than the Tile 0
+; routines, there's nothing in here that is particularly well optimized.
+
+Tile0TwoLyr
+            ldal  TileStore+TS_WORD_OFFSET,x
+            and   #$00FF
+            ora   #$4800
+            sta:  $0004,y
+            sta   $1004,y
+            sta   $2004,y
+            sta   $3004,y
+            sta   $4004,y
+            sta   $5004,y
+            sta   $6004,y
+            sta   $7004,y
+            inc
+            inc
+            sta:  $0001,y
+            sta   $1001,y
+            sta   $2001,y
+            sta   $3001,y
+            sta   $4001,y
+            sta   $5001,y
+            sta   $6001,y
+            sta   $7001,y
+
+            sep   #$20
+            lda   #$B1          ; This is a special case where we can set all the words to LDA (DP),y
+            sta:  $0000,y
+            sta:  $0003,y
+            sta   $1000,y
+            sta   $1003,y
+            sta   $2000,y
+            sta   $2003,y
+            sta   $3000,y
+            sta   $3003,y
+            sta   $4000,y
+            sta   $4003,y
+            sta   $5000,y
+            sta   $5003,y
+            sta   $6000,y
+            sta   $6003,y
+            sta   $7000,y
+            sta   $7003,y
+            rep   #$20
+            plb
+            rts
+
+; Draw from the sprite buffer into a fully transparent tile
+SpriteOver0TwoLyr
+
+            lda   TileStore+TS_JMP_ADDR,x      ; Get the address of the exception handler
+            sta   _JTBL_CACHE
+
+            lda   TileStore+TS_WORD_OFFSET,x   ; Load the word offset of this tile (0 to 82 in steps of 2)
+            ora   #$B100                       ; Pre-calc the LDA (dp),y opcode + operand
+            xba
+            sta   _OP_CACHE
+
+            lda   TileStore+TS_CODE_ADDR_HIGH,x
+            pha
+            ldy   TileStore+TS_CODE_ADDR_LOW,x
+            plb
+
+            CopyTwoLayerOver  tmp_sprite_data+0;$0003
+            CopyTwoLayerOver  tmp_sprite_data+4;$1003
+            CopyTwoLayerOver  tmp_sprite_data+8;$2003
+            CopyTwoLayerOver  tmp_sprite_data+12;$3003
+            CopyTwoLayerOver  tmp_sprite_data+16;$4003
+            CopyTwoLayerOver  tmp_sprite_data+20;$5003
+            CopyTwoLayerOver  tmp_sprite_data+24;$6003
+            CopyTwoLayerOver  tmp_sprite_data+28;$7003
+
+            sec
+            lda     _JTBL_CACHE
+            sbc     #SNIPPET_SIZE      ; Advance to the next snippet (Reverse indexing)
+            sta     _JTBL_CACHE
+
+            clc
+            lda     _OP_CACHE
+            adc     #$0200             ; Advance to the next word
+            sta     _OP_CACHE
+
+            CopyTwoLayerOver  tmp_sprite_data+2;$0000
+            CopyTwoLayerOver  tmp_sprite_data+6;$1000
+            CopyTwoLayerOver  tmp_sprite_data+10;$2000
+            CopyTwoLayerOver  tmp_sprite_data+14;$3000
+            CopyTwoLayerOver  tmp_sprite_data+18;$4000
+            CopyTwoLayerOver  tmp_sprite_data+22;$5000
+            CopyTwoLayerOver  tmp_sprite_data+26;$6000
+            CopyTwoLayerOver  tmp_sprite_data+30;$7000
+
+            plb
+            rts
+
+TmpTileDataToCodeField
+            lda   TileStore+TS_JMP_ADDR,x      ; Get the address of the exception handler
+            sta   _JTBL_CACHE
+
+            lda   TileStore+TS_WORD_OFFSET,x   ; Load the word offset of this tile (0 to 82 in steps of 2)
+            ora   #$B100                       ; Pre-calc the LDA (dp),y opcode + operand
+            xba
+            sta   _OP_CACHE
+
+            lda   TileStore+TS_CODE_ADDR_HIGH,x
+            pha
+            ldy   TileStore+TS_CODE_ADDR_LOW,x
+            plb
+
+_TmpTileDataToCodeField
+
+            CopyTwoLayerOver  tmp_tile_data+0;$0003
+            CopyTwoLayerOver  tmp_tile_data+4;$1003
+            CopyTwoLayerOver  tmp_tile_data+8;$2003
+            CopyTwoLayerOver  tmp_tile_data+12;$3003
+            CopyTwoLayerOver  tmp_tile_data+16;$4003
+            CopyTwoLayerOver  tmp_tile_data+20;$5003
+            CopyTwoLayerOver  tmp_tile_data+24;$6003
+            CopyTwoLayerOver  tmp_tile_data+28;$7003
+
+            sec
+            lda     _JTBL_CACHE
+            sbc     #SNIPPET_SIZE      ; Advance to the next snippet (Reverse indexing)
+            sta     _JTBL_CACHE
+
+            clc
+            lda     _OP_CACHE
+            adc     #$0200             ; Advance to the next word
+            sta     _OP_CACHE
+
+            CopyTwoLayerOver  tmp_tile_data+2;$0000
+            CopyTwoLayerOver  tmp_tile_data+6;$1000
+            CopyTwoLayerOver  tmp_tile_data+10;$2000
+            CopyTwoLayerOver  tmp_tile_data+14;$3000
+            CopyTwoLayerOver  tmp_tile_data+18;$4000
+            CopyTwoLayerOver  tmp_tile_data+22;$5000
+            CopyTwoLayerOver  tmp_tile_data+26;$6000
+            CopyTwoLayerOver  tmp_tile_data+30;$7000
+
+            plb
+            rts
+
+; Copy a tile into the tile data buffer and then render to the code field
+CopyTileATwoLyr
+            ldal  TileStore+TS_JMP_ADDR,x      ; Get the address of the exception handler
+            sta   _JTBL_CACHE
+
+            ldal  TileStore+TS_WORD_OFFSET,x   ; Load the word offset of this tile (0 to 82 in steps of 2)
+            ora   #$B100                       ; Pre-calc the LDA (dp),y opcode + operand
+            xba
+            sta   _OP_CACHE
+
+            ldal  TileStore+TS_TILE_ADDR,x
+            tax
+
+]line       equ   0
+            lup   8
+            ldal  tiledata+{]line*4},x
+            sta   tmp_tile_data+{]line*4}
+            ldal  tiledata+{]line*4}+32,x
+            sta   tmp_tile_mask+{]line*4}
+
+            ldal  tiledata+{]line*4}+2,x
+            sta   tmp_tile_data+{]line*4}+2
+            ldal  tiledata+{]line*4}+32+2,x
+            sta   tmp_tile_mask+{]line*4}+2
+]line       equ   ]line+1
+            --^
+            jmp   _TmpTileDataToCodeField
+
+CopyTileVTwoLyr
+            ldal  TileStore+TS_JMP_ADDR,x      ; Get the address of the exception handler
+            sta   _JTBL_CACHE
+
+            ldal  TileStore+TS_WORD_OFFSET,x   ; Load the word offset of this tile (0 to 82 in steps of 2)
+            ora   #$B100                       ; Pre-calc the LDA (dp),y opcode + operand
+            xba
+            sta   _OP_CACHE
+
+            ldal  TileStore+TS_TILE_ADDR,x
+            tax
+
+]src        equ   7
+]dest       equ   0
+            lup   8
+            ldal  tiledata+{]src*4},x
+            sta   tmp_tile_data+{]dest*4}
+            ldal  tiledata+{]src*4}+32,x
+            sta   tmp_tile_mask+{]dest*4}
+
+            ldal  tiledata+{]src*4}+2,x
+            sta   tmp_tile_data+{]dest*4}+2
+            ldal  tiledata+{]src*4}+32+2,x
+            sta   tmp_tile_mask+{]dest*4}+2
+]src        equ   ]src-1
+]dest       equ   ]dest+1
+            --^
+            jmp   _TmpTileDataToCodeField
+
+; Handle sprites + tiles.  Strategy is to merge the sprite and tile data and write it to the
+; temporary space an defer the actual work to the _TmpTileDataToCodeField helper
+SpriteOverATwoLyr
+            ldy   TileStore+TS_TILE_ADDR,x
+            pei   DP2_TILEDATA_AND_TILESTORE_BANKS
+            plb
+
+]line       equ   0
+            lup   8
+            lda   tiledata+{]line*4},y
+            and   tmp_sprite_mask+{]line*4}
+            ora   tmp_sprite_data+{]line*4}
+            sta   tmp_tile_data+{]line*4}
+
+            lda   tiledata+{]line*4}+32,y
+            and   tmp_sprite_mask+{]line*4}
+            sta   tmp_tile_mask+{]line*4}
+
+            lda   tiledata+{]line*4}+2,y
+            and   tmp_sprite_mask+{]line*4}+2
+            ora   tmp_sprite_data+{]line*4}+2
+            sta   tmp_tile_data+{]line*4}+2
+
+            lda   tiledata+{]line*4}+32+2,y
+            and   tmp_sprite_mask+{]line*4}+2
+            sta   tmp_tile_mask+{]line*4}+2
+]line       equ   ]line+1
+            --^
+            plb
+            jmp   TmpTileDataToCodeField
+
+SpriteOverVTwoLyr
+            ldy   TileStore+TS_TILE_ADDR,x
+            pei   DP2_TILEDATA_AND_TILESTORE_BANKS
+            plb
+
+]src        equ   7
+]dest       equ   0
+            lup   8
+            lda   tiledata+{]src*4},y
+            and   tmp_sprite_mask+{]dest*4}
+            ora   tmp_sprite_data+{]dest*4}
+            sta   tmp_tile_data+{]dest*4}
+
+            lda   tiledata+{]src*4}+32,y
+            and   tmp_sprite_mask+{]dest*4}
+            sta   tmp_tile_mask+{]dest*4}
+
+            lda   tiledata+{]src*4}+2,y
+            and   tmp_sprite_mask+{]dest*4}+2
+            ora   tmp_sprite_data+{]dest*4}+2
+            sta   tmp_tile_data+{]dest*4}+2
+
+            lda   tiledata+{]src*4}+32+2,y
+            and   tmp_sprite_mask+{]dest*4}+2
+            sta   tmp_tile_mask+{]dest*4}+2
+
+]src        equ   ]src-1
+]dest       equ   ]dest+1
+            --^
+            plb
+            jmp   TmpTileDataToCodeField
+
+SpriteUnderATwoLyr
+            ldy   TileStore+TS_TILE_ADDR,x
+            pei   DP2_TILEDATA_AND_TILESTORE_BANKS
+            plb
+
+]line       equ   0
+            lup   8
+            lda   tmp_sprite_data+{]line*4}
+            and   tiledata+{]line*4}+32,y
+            ora   tiledata+{]line*4},y
+            sta   tmp_tile_data+{]line*4}
+
+            lda   tiledata+{]line*4}+32,y
+            and   tmp_sprite_mask+{]line*4}
+            sta   tmp_tile_mask+{]line*4}
+
+            lda   tmp_sprite_data+{]line*4}+2
+            and   tiledata+{]line*4}+32+2,y
+            ora   tiledata+{]line*4}+2,y
+            sta   tmp_tile_data+{]line*4}+2
+
+            lda   tiledata+{]line*4}+32+2,y
+            and   tmp_sprite_mask+{]line*4}+2
+            sta   tmp_tile_mask+{]line*4}+2
+]line       equ   ]line+1
+            --^
+            plb
+            jmp   TmpTileDataToCodeField
+
+SpriteUnderVTwoLyr
+            ldy   TileStore+TS_TILE_ADDR,x
+            pei   DP2_TILEDATA_AND_TILESTORE_BANKS
+            plb
+
+]src        equ   7
+]dest       equ   0
+            lup   8
+            lda   tmp_sprite_data+{]dest*4}
+            and   tiledata+{]src*4}+32,y
+            ora   tiledata+{]src*4},y
+            sta   tmp_tile_data+{]dest*4}
+
+            lda   tiledata+{]src*4}+32,y
+            and   tmp_sprite_mask+{]dest*4}
+            sta   tmp_tile_mask+{]dest*4}
+
+            lda   tmp_sprite_data+{]dest*4}+2
+            and   tiledata+{]src*4}+32+2,y
+            ora   tiledata+{]src*4}+2,y
+            sta   tmp_tile_data+{]dest*4}+2
+
+            lda   tiledata+{]src*4}+32+2,y
+            and   tmp_sprite_mask+{]dest*4}+2
+            sta   tmp_tile_mask+{]dest*4}+2
+
+]src        equ   ]src-1
+]dest       equ   ]dest+1
+            --^
+            plb
+            jmp   TmpTileDataToCodeField
+
+; Macro to fill in the code field from a direct page temporary buffer
+;
+; ]1 : direct page address with data, the mask direct page address is data + 32
+; ]2 : code field offset
+;
+; Y is the code field address
+CopyTwoLayerOver mac
+            lda   {]1}+32           ; load the mask value
+            bne   mixed             ; a non-zero value may be mixed
+
+; This is a solid word
+            lda   #$00F4            ; PEA instruction
+            sta:  ]2,y
+            lda   {]1}              ; load the tile data
+            sta:  ]2+1,y            ; PEA operand
+            bra   next
+
+mixed       cmp   #$FFFF            ; All 1's in the mask is fully transparent
+            beq   transparent
+
+            lda   #$004C            ; JMP instruction
+            sta:  {]2},y
+            lda   _JTBL_CACHE       ; Get the offset to the exception handler for this column
+            ora   #{]2&$7000}       ; adjust for the current row offset
+            sta:  {]2}+1,y
+            tax                     ; This becomes the new address that we use to patch in
+
+            lda   #$29
+            sta:  $0002,x         ; AND #$0000 opcode
+            lda   #$09
+            sta:  $0005,x         ; ORA #$0000 opcode
+
+            lda   _OP_CACHE       ; Get the LDA (dp),y instruction for this column
+            sta:  $0000,x
+
+            lda   {]1}+32           ; insert the tile mask and data into the exception
+            sta:  $0003,x         ; handler.
+            lda   {]1}
+            sta:  $0006,x
+
+            lda   #$0D80          ; branch to the prologue (BRA *+15)
+            sta:  $0008,x
+
+            bra   next
+
+; This is a transparent word, so just show the second background layer
+transparent
+            lda   #$4800          ; put a PHA after the offset
+            sta:  {]2}+1,y
+            lda   _OP_CACHE
+            sta:  {]2},y
+next
+            eom
\ No newline at end of file
diff --git a/src/sprites/DirtySpriteProcs.s b/src/sprites/DirtySpriteProcs.s
new file mode 100644
index 0000000..65c68e1
--- /dev/null
+++ b/src/sprites/DirtySpriteProcs.s
@@ -0,0 +1,92 @@
+; Functions to handle rendering sprites into 8x8 tile buffers for dirty tile rendering.  Because we
+; are rendering directly to the graphics screen instead of the code field, we can map the direct
+; page into Bank 01 and use that to avoid writing the merge sprite and tile data to an intermediate
+; buffer.
+
+;DirtyTileSpriteProcs dw  _TBDirtySpriteTile_00,_TBDirtySpriteTile_0H,_TBDirtySpriteTile_V0,_TBDirtySpriteTile_VH
+
+; Optimization Note: The single-sprite blitter seems like it could be made faster by taking advantage of
+;                    the fact that only a single set of sprite data needs to be read, but the extra overhead
+;                    of using the direct page and setting up and restoring registers wipes out the 2 cycle
+;                    per word advantage.
+;
+; A = screen address
+; X = address of sprite data
+; Y = address of tile data
+; B = tile data bank
+
+_OneDirtySprite_00
+_OneDirtySprite_0H
+
+                 phd
+                 sei
+                 clc
+                 tcd
+                 _R0W1
+
+                 _ODS_Line 0,0,$0
+                 _ODS_Line 1,1,$A0
+                 tdc
+                 adc   #320
+                 tcd
+                 _ODS_Line 2,2,$0
+                 _ODS_Line 3,3,$A0
+                 tdc
+                 adc   #320
+                 tcd
+                 _ODS_Line 4,4,$0
+                 _ODS_Line 5,5,$A0
+                 tdc
+                 adc   #320
+                 tcd
+                 _ODS_Line 6,6,$0
+                 _ODS_Line 7,7,$A0
+
+                 _R0W0
+                 cli
+                 pld
+                 rts
+
+
+_OneDirtySprite_V0
+_OneDirtySprite_VH
+                 phd
+                 sei
+                 clc
+                 tcd
+                 _R0W1
+
+                 _ODS_Line 0,7,$0
+                 _ODS_Line 1,6,$A0
+                 tdc
+                 adc   #320
+                 tcd
+                 _ODS_Line 2,5,$0
+                 _ODS_Line 3,4,$A0
+                 tdc
+                 adc   #320
+                 tcd
+                 _ODS_Line 4,3,$0
+                 _ODS_Line 5,2,$A0
+                 tdc
+                 adc   #320
+                 tcd
+                 _ODS_Line 6,1,$0
+                 _ODS_Line 7,0,$A0
+
+                 _R0W0
+                 cli
+                 pld
+                 rts
+
+
+; Build up from here
+_FourDirtySprites
+                 lda   TileStore+TS_VBUFF_ADDR_0,y
+                 sta   spriteIdx
+                 lda   TileStore+TS_VBUFF_ADDR_1,y
+                 sta   spriteIdx+4
+                 lda   TileStore+TS_VBUFF_ADDR_2,y
+                 sta   spriteIdx+8
+                 lda   TileStore+TS_VBUFF_ADDR_3,y
+                 sta   spriteIdx+12
\ No newline at end of file
diff --git a/src/sprites/SpriteProcs.s b/src/sprites/SpriteProcs.s
new file mode 100644
index 0000000..10d0fc5
--- /dev/null
+++ b/src/sprites/SpriteProcs.s
@@ -0,0 +1,150 @@
+; Functions to handle rendering sprite information into buffers for updates to the 
+; code field.  Due to lack of parallel structure, the sprites are combined with the
+; tile data and then written to a single direct page buffer.  The data is read from
+; this buffer and then applied to the code field
+
+; Merge a single block of sprite data with a tile
+_OneSprite_00
+_OneSprite_H0
+                 ldx   TileStore+TS_VBUFF_ADDR_0,y
+                 lda   TileStore+TS_TILE_ADDR,y
+                 tay
+
+]line            equ   0
+                 lup   8
+                 lda   tiledata+{]line*TILE_DATA_SPAN},y
+                 andl  spritemask+{]line*SPRITE_PLANE_SPAN},x
+                 oral  spritedata+{]line*SPRITE_PLANE_SPAN},x
+                 sta   tmp_sprite_data+{]line*4}
+
+                 lda   tiledata+{]line*TILE_DATA_SPAN}+2,y
+                 andl  spritemask+{]line*SPRITE_PLANE_SPAN}+2,x
+                 oral  spritedata+{]line*SPRITE_PLANE_SPAN}+2,x
+                 sta   tmp_sprite_data+{]line*4}+2
+]line            equ   ]line+1
+                 --^
+
+_OneSprite_V0
+_OneSprite_VH
+                 ldx   TileStore+TS_VBUFF_ADDR_0,y
+                 lda   TileStore+TS_TILE_ADDR,y
+                 tay
+
+]line            equ   7
+]dest            equ   0
+                 lup   8
+                 lda   tiledata+{]line*TILE_DATA_SPAN},y
+                 andl  spritemask+{]dest*SPRITE_PLANE_SPAN},x
+                 oral  spritedata+{]dest*SPRITE_PLANE_SPAN},x
+                 sta   tmp_sprite_data+{]dest*4}
+
+                 lda   tiledata+{]line*TILE_DATA_SPAN}+2,y
+                 andl  spritemask+{]dest*SPRITE_PLANE_SPAN}+2,x
+                 oral  spritedata+{]dest*SPRITE_PLANE_SPAN}+2,x
+                 sta   tmp_sprite_data+{]dest*4}+2
+]line            equ   ]line-1
+]dest            equ   ]dest+1
+                 --^
+                 rts
+
+
+; Merge two blocks of sprite data.  This is more involved because we need to use the
+; direct page pointers to stack the sprite information
+_TwoSprite_00
+_TwoSprite_H0
+                 lda   TileStore+TS_VBUFF_ADDR_0,y
+                 sta   sprite_0
+                 lda   TileStore+TS_VBUFF_ADDR_1,y
+                 sta   sprite_1
+                 ldx   TileStore+TS_TILE_ADDR,y
+
+; line 0
+                 lda   tiledata+{0*TILE_DATA_SPAN},x
+                 and   [sprite_1]
+                 ora   (sprite_1)
+                 and   [sprite_0]
+                 ora   (sprite_0)
+                 sta   tmp_sprite_data+{0*4}
+
+                 ldy   #{0*SPRITE_PLANE_SPAN}+2
+                 lda   tiledata+{0*TILE_DATA_SPAN}+2,x
+                 and   [sprite_1],y
+                 ora   (sprite_1),y
+                 and   [sprite_0],y
+                 ora   (sprite_0),y
+                 sta   tmp_sprite_data+{0*4}+2
+
+; line 1
+                 ldy   #{1*SPRITE_PLANE_SPAN}
+                 lda   tiledata+{1*TILE_DATA_SPAN},x
+                 and   [sprite_1],y
+                 ora   (sprite_1),y
+                 and   [sprite_0],y
+                 ora   (sprite_0),y
+                 sta   tmp_sprite_data+{1*4}
+
+                 ldy   #{1*SPRITE_PLANE_SPAN}+2
+                 lda   tiledata+{1*TILE_DATA_SPAN}+2,x
+                 and   [sprite_1],y
+                 ora   (sprite_1),y
+                 and   [sprite_0],y
+                 ora   (sprite_0),y
+                 sta   tmp_sprite_data+{1*4}+2
+
+                 rts
+
+
+; Merge three blocks of sprite data.  This is more involved because we need to use the
+; direct page pointers to stack the sprite information
+_ThreeSprite_00
+_ThreeSprite_H0
+                 lda   TileStore+TS_VBUFF_ADDR_0,y
+                 sta   sprite_0
+                 lda   TileStore+TS_VBUFF_ADDR_1,y
+                 sta   sprite_1
+                 lda   TileStore+TS_VBUFF_ADDR_2,y
+                 sta   sprite_2
+                 ldx   TileStore+TS_TILE_ADDR,y
+
+; line 0
+                 lda   tiledata+{0*TILE_DATA_SPAN},x
+                 and   [sprite_2]
+                 ora   (sprite_2)
+                 and   [sprite_1]
+                 ora   (sprite_1)
+                 and   [sprite_0]
+                 ora   (sprite_0)
+                 sta   tmp_sprite_data+{0*4}
+
+                 ldy   #{0*SPRITE_PLANE_SPAN}+2
+                 lda   tiledata+{0*TILE_DATA_SPAN}+2,x
+                 and   [sprite_2],y
+                 ora   (sprite_2),y
+                 and   [sprite_1],y
+                 ora   (sprite_1),y
+                 and   [sprite_0],y
+                 ora   (sprite_0),y
+                 sta   tmp_sprite_data+{0*4}+2
+
+; line 1
+                 ldy   #{1*SPRITE_PLANE_SPAN}
+                 lda   tiledata+{1*TILE_DATA_SPAN},x
+                 and   [sprite_2],y
+                 ora   (sprite_2),y
+                 and   [sprite_1],y
+                 ora   (sprite_1),y
+                 and   [sprite_0],y
+                 ora   (sprite_0),y
+                 sta   tmp_sprite_data+{1*4}
+
+                 ldy   #{1*SPRITE_PLANE_SPAN}+2
+                 lda   tiledata+{1*TILE_DATA_SPAN}+2,x
+                 and   [sprite_2],y
+                 ora   (sprite_2),y
+                 and   [sprite_1],y
+                 ora   (sprite_1),y
+                 and   [sprite_0],y
+                 ora   (sprite_0),y
+                 sta   tmp_sprite_data+{1*4}+2
+
+                 rts
\ No newline at end of file
diff --git a/src/static/SprData.s b/src/static/SprData.s
new file mode 100644
index 0000000..8c9150b
--- /dev/null
+++ b/src/static/SprData.s
@@ -0,0 +1,5 @@
+; sprite stamp pixel data
+spritedata ENT
+;           ds   65535
+           ds   65536
+
diff --git a/src/static/SprMask.s b/src/static/SprMask.s
new file mode 100644
index 0000000..d8e2f9b
--- /dev/null
+++ b/src/static/SprMask.s
@@ -0,0 +1,5 @@
+; sprite stamp masks
+spritemask ENT
+;           ds   65535
+           ds   65536
+
diff --git a/src/static/TileData.s b/src/static/TileData.s
new file mode 100644
index 0000000..aa77f32
--- /dev/null
+++ b/src/static/TileData.s
@@ -0,0 +1,5 @@
+; Bank of memory that holds the 8x8 tile data
+tiledata  ENT
+;           ds   65535
+           ds   65536
+
diff --git a/src/blitter/Tables.s b/src/static/TileStore.s
similarity index 52%
rename from src/blitter/Tables.s
rename to src/static/TileStore.s
index 8493199..06c218c 100644
--- a/src/blitter/Tables.s
+++ b/src/static/TileStore.s
@@ -1,5 +1,88 @@
-; Collection of data tables
+; Bank of memory that holds the core sprite and tile store data structures
+
+                put  ../Defs.s
+                put  TileStoreDefs.s
+
+;-------------------------------------------------------------------------------------
 ;
+                put  ../blitter/Template.s
+
+;-------------------------------------------------------------------------------------
+
+TileStore      ENT
+               ds   {TILE_STORE_SIZE*TILE_STORE_NUM}
+
+;-------------------------------------------------------------------------------------
+;
+; A list of dirty tiles that need to be updated in a given frame
+
+               ds    \,$00             ; pad to the next page boundary
+DirtyTileCount ENT
+               ds   2
+DirtyTiles     ENT
+               ds   TILE_STORE_SIZE    ; At most this many tiles can possibly be updated at once
+
+;-------------------------------------------------------------------------------------
+;
+
+               ds  \,$00             ; pad to the next page boundary
+_Sprites       ENT
+               ds  SPRITE_REC_SIZE*MAX_SPRITES
+
+;-------------------------------------------------------------------------------------
+;
+; A double-sized table of lookup values.  It is double-width and double-height so that,
+; if we know a tile's address position of (X + 41*Y), then any relative tile store address
+; can be looked up by adding a constant value.
+                      ds  \,$00             ; pad to the next page boundary
+TileStoreLookupYTable ENT
+]line                 equ  0
+                      lup  TS_LOOKUP_HEIGHT
+                      dw   ]line
+]line                 equ  ]line+{2*TS_LOOKUP_SPAN}
+                      --^
+
+; Width of tile store is 41 elements
+TileStoreData mac
+              dw  ]1+0,]1+2,]1+4,]1+6,]1+8,]1+10,]1+12,]1+14
+              dw  ]1+16,]1+18,]1+20,]1+22,]1+24,]1+26,]1+28,]1+30
+              dw  ]1+32,]1+34,]1+36,]1+38,]1+40,]1+42,]1+44,]1+46
+              dw  ]1+48,]1+50,]1+52,]1+54,]1+56,]1+58,]1+60,]1+62
+              dw  ]1+64,]1+66,]1+68,]1+70,]1+72,]1+74,]1+76,]1+78
+              dw  ]1+80
+              <<<
+; Create a lookup table with two runs of offsets, plus an overlap area on the end (41+41+1 = 83 = TS_LOOKUP_SPAN)
+TileStoreLookup       ENT
+
+; First copy
+]row                  equ  0
+                      lup  TILE_STORE_HEIGHT
+                      TileStoreData ]row*2*TILE_STORE_WIDTH
+                      TileStoreData ]row*2*TILE_STORE_WIDTH
+                      dw   ]row*2*TILE_STORE_WIDTH,]row*2*TILE_STORE_WIDTH+2
+]row                  equ  ]row+1
+                      --^
+
+; Second copy
+]row                  equ  0
+                      lup  TILE_STORE_HEIGHT
+                      TileStoreData ]row*2*TILE_STORE_WIDTH
+                      TileStoreData ]row*2*TILE_STORE_WIDTH
+                      dw   ]row*2*TILE_STORE_WIDTH,]row*2*TILE_STORE_WIDTH+2
+]row                  equ  ]row+1
+                      --^
+
+; Last two rows
+                      TileStoreData 0*2*TILE_STORE_WIDTH
+                      TileStoreData 0*2*TILE_STORE_WIDTH
+                      dw   0*2*TILE_STORE_WIDTH,0*2*TILE_STORE_WIDTH+2
+                      TileStoreData 1*2*TILE_STORE_WIDTH
+                      TileStoreData 1*2*TILE_STORE_WIDTH
+                      dw   1*2*TILE_STORE_WIDTH,1*2*TILE_STORE_WIDTH+2
+
+;-------------------------------------------------------------------------------------
+;
+; Other data tables
 
 ; Col2CodeOffset
 ;
@@ -19,21 +102,21 @@
 ;
 ; Remember, because the data is pushed on to the stack, the last instruction, which is
 ; in the highest memory location, pushed data that apepars on the left edge of the screen.
-PER_TILE_SIZE     equ   3
-]step             equ   0
 
+]step             equ   0
                   dw    CODE_TOP    ; There is a spot where we load Col2CodeOffet-2,x
-Col2CodeOffset    lup   82
+Col2CodeOffset    ENT
+                  lup   82
                   dw    CODE_TOP+{{81-]step}*PER_TILE_SIZE}
 ]step             equ   ]step+1
                   --^
                   dw    CODE_TOP+{81*PER_TILE_SIZE}
 
 ; A parallel table to Col2CodeOffset that holds the offset to the exception handler address for each column
-SNIPPET_SIZE      equ   32
 ]step             equ   0
                   dw    SNIPPET_BASE
-JTableOffset      lup   82
+JTableOffset      ENT
+                  lup   82
                   dw    SNIPPET_BASE+{{81-]step}*SNIPPET_SIZE}
 ]step             equ   ]step+1
                   --^
@@ -46,7 +129,7 @@ JTableOffset      lup   82
 ;
 ; These tables are reversed to be parallel with the JTableOffset and Col2CodeOffset tables above.  The
 ; physical word index that each instruction is intended to be placed at is in the comment.
-CodeFieldEvenBRA
+CodeFieldEvenBRA  ENT
                   bra   *+6         ; 81 -- need to skip over the JMP loop that passed control back
                   bra   *+9         ; 80
                   bra   *+12        ; 79
@@ -130,7 +213,7 @@ CodeFieldEvenBRA
                   bra   *-6         ; 1
                   bra   *-3         ; 0
 
-CodeFieldOddBRA
+CodeFieldOddBRA   ENT
                   bra   *+9         ; 81 -- need to skip over two JMP instructions
                   bra   *+12        ; 80
                   bra   *+15        ; 79
@@ -240,7 +323,7 @@ TileStoreYTable   ENT
 
 ; Create a table to look up the "next" column with modulo wraparound.  Basically a[i] = i
 ; and the table is double-length.  Use constant offsets to pick an amount to advance
-NextCol
+NextCol           ENT
 ]step             equ   0
                   lup   41
                   dw    ]step
@@ -252,16 +335,12 @@ NextCol
 ]step             =     ]step+2
                   --^
 
-; A double-sized table of lookup values.  This is basically the cross-product of TileStoreYTable and
-; NextCol.  If is double-width and double-height so that, if we know a tile's address position
-; of (X + 41*Y), then any relative tile store address can be looked up by adding a constan value.
-;TileStore2DLookup ds    {26*41*2}*4
-
 ; This is a double-length table that holds the right-edge adresses of the playfield on the physical
 ; screen.  At most, it needs to hold 200 addresses for a full height playfield.  It is double-length
 ; so that code can pick any offset and copy values without needing to check for a wrap-around. If the
 ; playfield is less than 200 lines tall, then any values after 2 * PLAYFIELD_HEIGHT are undefined.
-RTable            ds    400
+RTable            ENT
+                  ds    400
                   ds    400
 
 ; Array of addresses for the banks that hold the blitter. 
@@ -271,17 +350,22 @@ BlitBuff          ENT
 ; The blitter table (BTable) is a double-length table that holds the full 4-byte address of each
 ; line of the blit fields.  We decompose arrays of pointers into separate high and low words so
 ; that everything can use the same indexing offsets
-BTableHigh        ds    208*2*2
-BTableLow         ds    208*2*2
+BTableHigh        ENT
+                  ds    208*2*2
+BTableLow         ENT
+                  ds    208*2*2
 
 ; A shorter table that just holds the blitter row addresses
-BRowTableHigh     ds    26*2*2
-BRowTableLow      ds    26*2*2
+BRowTableHigh     ENT
+                  ds    26*2*2
+BRowTableLow      ENT
+                  ds    26*2*2
 
 ; A double-length table of addresses for the BG1 bank.  The BG1 buffer is 208 rows of 256 bytes each and
 ; the first row starts $1800 bytes in to center the buffer in the bank
 ]step             equ   $1800
-BG1YTable         lup   208
+BG1YTable         ENT
+                  lup   208
                   dw    ]step
 ]step             =     ]step+256
                   --^
@@ -292,11 +376,135 @@ BG1YTable         lup   208
                   --^
 
 ; Repeat
-BG1YOffsetTable   lup   26
+BG1YOffsetTable   ENT
+                  lup   26
                   dw    1,1,1,2,2,2,2,2,1,1,1,0,0,0,0,0
                   --^
 
+; Other Toolset variables
+OneSecondCounter  ENT
+                  dw        0
+OldOneSecVec      ENT
+                  ds        4
+Timers            ENT
+                  ds        TIMER_REC_SIZE*MAX_TIMERS
+Overlays          ENT
+                  dw        0     ; count
+                  ds        8     ; only support one or now (start_line, end_line, function call)
 
+; From the IIgs ref 
+DefaultPalette   ENT
+                 dw    $0000,$0777,$0841,$072C
+                 dw    $000F,$0080,$0F70,$0D00
+                 dw    $0FA9,$0FF0,$00E0,$04DF
+                 dw    $0DAF,$078F,$0CCC,$0FFF
 
+;  0. Full Screen           : 40 x 25   320 x 200 (32,000 bytes (100.0%)) 
+;  1. Sword of Sodan        : 34 x 24   272 x 192 (26,112 bytes ( 81.6%))
+;  2. ~NES                  : 32 x 25   256 x 200 (25,600 bytes ( 80.0%))
+;  3. Task Force            : 32 x 22   256 x 176 (22,528 bytes ( 70.4%))
+;  4. Defender of the World : 35 x 20   280 x 160 (22,400 bytes ( 70.0%))
+;  5. Rastan                : 32 x 20   256 x 160 (20,480 bytes ( 64.0%))
+;  6. Game Boy Advanced     : 30 x 20   240 x 160 (19,200 bytes ( 60.0%))
+;  7. Ancient Land of Y's   : 36 x 16   288 x 128 (18,432 bytes ( 57.6%))
+;  8. Game Boy Color        : 20 x 18   160 x 144 (11,520 bytes ( 36.0%))
+;  9. Agony (Amiga)         : 36 x 24   288 x 192 (27,648 bytes ( 86.4%))
+; 10. Atari Lynx            : 20 x 13   160 x 102 (8,160 bytes  ( 25.5%))
+ScreenModeWidth  ENT
+                 dw        320,272,256,256,280,256,240,288,160,288,160,320
+ScreenModeHeight ENT
+                 dw        200,192,200,176,160,160,160,128,144,192,102,1
 
+; VBuff arrays for each sprite. We need at least a 3x3 block for each sprite and the shape of the
+; array must match the TileStore structure.  The TileStore is 41 blocks wide. 
+;
+; It is *critical* that this array be placed in a memory location that is greater than the largest
+; TileStore offset because the engine maintaines a per-sprite pointer equal to the VBuff array
+; address minut the TileStore offset for the top-left corner of that sprite.  This allows all of
+; the sprites to share the same table, but the result of the subtraction has to be positive.
+;
+; Each block of data contains fixed offsets for the relative position of vbuff addresses.  There
+; are multiple copies of the array to handle cases where a sprite needs to transition across the
+; boundary.
+;
+; For example. If a sprite is drawn in the last column, but is two blocks wide, the TileIndex
+; value for the first column is $52 and the second column is $00.  Since the pointer to the
+; VBuffArray is pre-adjusted by the first column's size, the first offset value will be read
+; from (VBuffArray - $52)[$52] = VBuffArray[0], which is correct.  However, the second column will be
+; read from (VBuffArray - $52)[$00] which is one row off from the correct value's location.
+;
+; The wrapping also need to account for vertical wrapping. Consider a 16x16 sprite with its top-left
+; conder inside the physical tile that is the bottom-right-most tile in the Tile Store.  So, the
+; lookup index for this tile is (26*41*2)-2 = 2130.  When using the lookup table, each step to the
+; right or down will cause wrap-around.  So the lookup addresses look like this
+;
+;   +------+------+     +------+------+
+;   | $852 | $800 |     | $000 | $004 |
+;   +------+------+ --> +------+------+
+;   | $052 | $000 |     | $030 | $034 |
+;   +------+------+     +------+------+
+;
+; We need to maintain 9 different lookup table variations, which is equal to the number of tile
+; in the largest sprite (3x3 tiles = 9 different border cases)
 
+;COL_BYTES        equ 4                                   ; VBUFF_TILE_COL_BYTES
+;ROW_BYTES        equ 384                                 ; VBUFF_TILE_ROW_BYTES
+
+; Define the offset values
+;___NA_NA___      equ 0
+;ROW_0_COL_0      equ {{0*COL_BYTES}+{0*ROW_BYTES}}
+;ROW_0_COL_1      equ {{1*COL_BYTES}+{0*ROW_BYTES}}
+;ROW_0_COL_2      equ {{2*COL_BYTES}+{0*ROW_BYTES}}
+;ROW_1_COL_0      equ {{0*COL_BYTES}+{1*ROW_BYTES}}
+;ROW_1_COL_1      equ {{1*COL_BYTES}+{1*ROW_BYTES}}
+;ROW_1_COL_2      equ {{2*COL_BYTES}+{1*ROW_BYTES}}
+;ROW_2_COL_0      equ {{0*COL_BYTES}+{2*ROW_BYTES}}
+;ROW_2_COL_1      equ {{1*COL_BYTES}+{2*ROW_BYTES}}
+;ROW_2_COL_2      equ {{2*COL_BYTES}+{2*ROW_BYTES}}
+
+; Allocate an amount of space equal to a TileStore block because we could have vertical wrap around.
+; The rest of the values are in just the first few rows following this block
+;
+; The first block of 4 values is the "normal" case, (X in [0, N-3], Y in [0, M-3]), so no wrap around is needed
+; The second block is (X = N-1, Y in [0, M-3])
+; The third block is (X = N-2, Y in [0, M-3])
+; The fourth block is (X in [0, N-3], Y = M-1)
+; The fifth block is (X = N-1, Y = M-1)
+; The sixth block is (X = N-2, Y = M-1)
+; The seventh block is (X in [0, N-3], Y = M-2)
+; The eighth block is (X = N-1, Y = M-2)
+; The ninth block is (X = N-2, Y = M-2)
+
+VBuffVertTableSelect ENT                            ; 51 entries
+                  dw 0,0,0,0,0,0,0,0,0,0
+                  dw 0,0,0,0,0,0,0,0,0,0
+                  dw 0,0,0,0,48,24
+                  dw 0,0,0,0,0,0,0,0,0,0
+                  dw 0,0,0,0,0,0,0,0,0,0
+                  dw 0,0,0,0,48,24
+VBuffHorzTableSelect ENT
+                  dw 0,0,0,0,0,0,0,0,0,0
+                  dw 0,0,0,0,0,0,0,0,0,0
+                  dw 0,0,0,0,0,0,0,0,0,0
+                  dw 0,0,0,0,0,0,0,0,0,16,8
+                  dw 0,0,0,0,0,0,0,0,0,0
+                  dw 0,0,0,0,0,0,0,0,0,0
+                  dw 0,0,0,0,0,0,0,0,0,0
+                  dw 0,0,0,0,0,0,0,0,0,16,8
+
+VBuffStart        ds  TILE_STORE_SIZE
+VBuffArray        ENT
+                  ds  {TILE_STORE_WIDTH*2}*3
+
+; Convert sprite index to a bit position
+_SpriteBits      ENT
+                 dw $0001,$0002,$0004,$0008,$0010,$0020,$0040,$0080,$0100,$0200,$0400,$0800,$1000,$2000,$4000,$8000
+_SpriteBitsNot   ENT
+                 dw $FFFE,$FFFD,$FFFB,$FFF7,$FFEF,$FFDF,$FFBF,$FF7F,$FEFF,$FDFF,$FBFF,$F7FF,$EFFF,$DFFF,$BFFF,$7FFF
+
+; Steps to the different sprite stamps
+_stamp_step      ENT
+                 dw  0,12,24,36
+
+blt_return
+stk_save
\ No newline at end of file
diff --git a/src/static/TileStoreDefs.s b/src/static/TileStoreDefs.s
new file mode 100644
index 0000000..8a5d3d1
--- /dev/null
+++ b/src/static/TileStoreDefs.s
@@ -0,0 +1,113 @@
+; Tile storage parameters
+TILE_DATA_SPAN        equ  4
+TILE_STORE_WIDTH      equ  41
+TILE_STORE_HEIGHT     equ  26
+MAX_TILES             equ  {26*41}                ; Number of tiles in the code field (41 columns * 26 rows)
+TILE_STORE_SIZE       equ  {MAX_TILES*2}          ; The tile store contains a tile descriptor in each slot
+
+TS_TILE_ID            equ  {TILE_STORE_SIZE*0}      ; tile descriptor for this location
+TS_DIRTY              equ  {TILE_STORE_SIZE*1}      ; Flag. Used to prevent a tile from being queued multiple times per frame
+TS_SPRITE_FLAG        equ  {TILE_STORE_SIZE*2}      ; Bitfield of all sprites that intersect this tile. 0 if no sprites.
+TS_TILE_ADDR          equ  {TILE_STORE_SIZE*3}      ; cached value, the address of the tiledata for this tile
+TS_CODE_ADDR_LOW      equ  {TILE_STORE_SIZE*4}      ; const value, address of this tile in the code fields
+TS_CODE_ADDR_HIGH     equ  {TILE_STORE_SIZE*5}
+TS_WORD_OFFSET        equ  {TILE_STORE_SIZE*6}      ; const value, word offset value for this tile if LDA (dp),y instructions re used
+;TS_BASE_ADDR          equ  {TILE_STORE_SIZE*7}      ; const value, because there are two rows of tiles per bank, this is set to $0000 or $8000.
+TS_JMP_ADDR           equ  {TILE_STORE_SIZE*7}      ; const value, address of the 32-byte snippet space for this tile
+TS_SCREEN_ADDR        equ  {TILE_STORE_SIZE*8}      ; cached value of on-screen location of tile. Used for DirtyRender.
+
+; TODO: Move these arrays into the K bank to support direct dispatch via jmp (abs,x)
+; TS_BASE_TILE_COPY     equ  {TILE_STORE_SIZE*9}      ; derived from TS_TILE_ID to optimize tile copy to support sprite rendering
+; TS_BASE_TILE_DISP     equ  {TILE_STORE_SIZE*10}     ; derived from TS_TILE_ID to optimize base (non-sprite) tile dispatch in the Render function
+; TS_DIRTY_TILE_DISP    equ  {TILE_STORE_SIZE*11}     ; derived from TS_TILE_ID to optimize dirty tile dispatch in the Render function
+
+TILE_STORE_NUM        equ  12                     ; Need this many parallel arrays
+
+; Sprite data structures.  We cache quite a few pieces of information about the sprite
+; to make calculations faster, so this is hidden from the caller.
+
+MAX_SPRITES            equ 16
+SPRITE_REC_SIZE        equ 42
+
+; Mark each sprite as ADDED, UPDATED, MOVED, REMOVED depending on the actions applied to it
+; on this frame.  Quick note, the same Sprite ID cannot be removed and added in the same frame.
+; A REMOVED sprite if removed from the sprite list during the Render call, so it's ID is not
+; available to the AddSprite function until the next frame.
+
+SPRITE_STATUS_EMPTY    equ $0000         ; If the status value is zero, this sprite slot is available
+SPRITE_STATUS_OCCUPIED equ $8000         ; Set the MSB to flag it as occupied
+SPRITE_STATUS_ADDED    equ $0001         ; Sprite was just added (new sprite)
+SPRITE_STATUS_MOVED    equ $0002         ; Sprite's position was changed
+SPRITE_STATUS_UPDATED  equ $0004         ; Sprite's non-position attributes were changed
+SPRITE_STATUS_REMOVED  equ $0008         ; Sprite has been removed.
+
+; These values are set by the user
+SPRITE_STATUS        equ {MAX_SPRITES*0}
+SPRITE_ID            equ {MAX_SPRITES*2}
+SPRITE_X             equ {MAX_SPRITES*4}
+SPRITE_Y             equ {MAX_SPRITES*6}
+VBUFF_ADDR           equ {MAX_SPRITES*8}         ; Base address of the sprite's stamp in the data/mask banks
+
+; These values are cached / calculated during the rendering process
+TS_LOOKUP_INDEX      equ {MAX_SPRITES*10}        ; The index from the TileStoreLookup table that corresponds to the top-left corner of the sprite
+TS_COVERAGE_SIZE     equ {MAX_SPRITES*12}        ; Representation of how many TileStore tiles (NxM) are covered by this sprite
+SPRITE_DISP          equ {MAX_SPRITES*14}        ; Cached address of the specific stamp based on sprite flags
+SPRITE_CLIP_LEFT     equ {MAX_SPRITES*16}
+SPRITE_CLIP_RIGHT    equ {MAX_SPRITES*18}
+SPRITE_CLIP_TOP      equ {MAX_SPRITES*20}
+SPRITE_CLIP_BOTTOM   equ {MAX_SPRITES*22}
+IS_OFF_SCREEN        equ {MAX_SPRITES*24}
+SPRITE_WIDTH         equ {MAX_SPRITES*26}
+SPRITE_HEIGHT        equ {MAX_SPRITES*28}
+SPRITE_CLIP_WIDTH    equ {MAX_SPRITES*30}
+SPRITE_CLIP_HEIGHT   equ {MAX_SPRITES*32}
+TS_VBUFF_BASE        equ {MAX_SPRITES*34}        ; Finalized VBUFF address based on the sprite position and tile offsets
+VBUFF_ARRAY_ADDR     equ {MAX_SPRITES*36}        ; Fixed address where this sprite's VBUFF addresses are stores. The array is the same shape as TileStore, but much smaller
+
+; 52 rows by 82 columns + 2 extra rows and columns for sprite sizes
+;
+; 53 rows = TILE_STORE_HEIGHT + TILE_STORE_HEIGHT + 1
+; 83 cols = TILE_STORE_WIDTH + TILE_STORE_WIDTH + 1
+;
+; TILE_STORE_WIDTH  equ  41
+; TILE_STORE_HEIGHT equ  26
+
+TS_LOOKUP_WIDTH   equ 82
+TS_LOOKUP_HEIGHT  equ 52
+TS_LOOKUP_BORDER  equ 2
+TS_LOOKUP_SPAN    equ {TS_LOOKUP_WIDTH+TS_LOOKUP_BORDER}
+TS_LOOKUP_ROWS    equ {TS_LOOKUP_HEIGHT+TS_LOOKUP_BORDER}
+
+; Blitter template constants
+PER_TILE_SIZE     equ   3
+SNIPPET_SIZE      equ   32
+
+;----------------------------------------------------------------------
+;
+; Timer implementation
+;
+; The engire provides four timer slot that can be used by one-shot or 
+; recurring timers.  Each timer is given an initial tick count, a 
+; reset tick count (0 = one-shot), and an action to perform.
+;
+; The timers handle overflow, so if a recurring timer has a tick count of 3
+; and 7 VBL ticks have passed, then the timer will be fired twice and
+; a tick count of 2 will be set.
+;
+; As such, the timers are appropriate to drive physical and other game
+; behaviors at a frame-independent rate.
+;
+; A collection of 4 timers that are triggered when their countdown
+; goes below zero.  Each timer takes up 16 bytes
+;
+; A timer can fire multiple times during a singular evaluation.  For example, if the
+; timer delay is set to 1 and 3 VBL ticks happen, then the timer delta is -2, will fire,
+; have the delay added and get -1, fire again, increment to zero, first again and then
+; finally reset to 1.
+;
+; +0 counter         decremented by the number of ticks since last run
+; +2 reset           copied into counter when triggered. 0 turns off the timer.
+; +4 addr            long address of timer routine
+; +8 user            8 bytes of user data space for timer state
+MAX_TIMERS      equ       4
+TIMER_REC_SIZE  equ       16
diff --git a/src/tiles/DirtyTileProcs.s b/src/tiles/DirtyTileProcs.s
new file mode 100644
index 0000000..f3ebe56
--- /dev/null
+++ b/src/tiles/DirtyTileProcs.s
@@ -0,0 +1,43 @@
+; A collection of tile blitters used in the dirty renderer.  These renderers copy data directly
+; to the graphics screen.  Also, because the dirty render assumes that the screen is not moving,
+; there is no support for two layer tiles.
+
+; Address table of the rendering functions
+DirtyTileProcs   dw    _TBDirtyTile_00,_TBDirtyTile_0H,_TBDirtyTile_V0,_TBDirtyTile_VH
+
+; Normal and horizontally flipped tiles.  The horizontal variant is selected by choosing
+; and appropriate value for the X register, so these can share the same code.
+;
+; B = Bank 01
+; X = address of tile data
+; Y = screen address
+_TBDirtyTile_00
+_TBDirtyTile_0H
+]line            equ             0
+                 lup             8
+                 ldal            tiledata+{]line*4},x
+                 sta:            $0000+{]line*160},y
+                 ldal            tiledata+{]line*4}+2,x
+                 sta:            $0002+{]line*160},y
+]line            equ             ]line+1
+                 --^
+                 rts
+
+; Vertically flipped tile renderers
+;
+; B = Bank 01
+; X = address of tile data
+; Y = screen address
+_TBDirtyTile_V0
+_TBDirtyTile_VH
+]line            equ             7
+]dest            equ             0
+                 lup             8
+                 ldal            tiledata+{]line*4},x
+                 sta:            $0000+{]dest*160},y
+                 ldal            tiledata+{]line*4}+2,x
+                 sta:            $0002+{]dest*160},y
+]line            equ             ]line-1
+]dest            equ             ]dest+1
+                 --^
+                 rts
\ No newline at end of file
diff --git a/src/tiles/DirtyTileQueue.s b/src/tiles/DirtyTileQueue.s
new file mode 100644
index 0000000..459c00e
--- /dev/null
+++ b/src/tiles/DirtyTileQueue.s
@@ -0,0 +1,181 @@
+_ClearDirtyTiles
+                 bra  :hop
+:loop
+                 jsr  _PopDirtyTile
+:hop
+                 lda  DirtyTileCount
+                 bne  :loop
+                 rts
+
+
+; Append a new dirty tile record 
+;
+;  A = result of _GetTileStoreOffset for X, Y
+;
+; The main purpose of this function is to
+;
+;  1. Avoid marking the same tile dirty multiple times, and
+;  2. Pre-calculating all of the information necessary to render the tile
+_PushDirtyTile
+                 tax
+
+; alternate entry point if the x-register is already set
+_PushDirtyTileX
+                 lda  TileStore+TS_DIRTY,x
+                 bne  :occupied2
+
+                 inc                                  ; any non-zero value will work
+                 sta  TileStore+TS_DIRTY,x            ; and is 1 cycle faster than loading a constant value
+
+                 txa
+                 ldx  DirtyTileCount ; 4
+                 sta  DirtyTiles,x   ; 6
+                 inx                 ; 2
+                 inx                 ; 2
+                 stx  DirtyTileCount ; 4 = 18
+                 rts
+:occupied2
+                 txa                                ; Make sure TileStore offset is returned in the accumulator
+                 rts
+
+; alternate entry point if the Y-register is already set
+_PushDirtyTileY
+                 lda  TileStore+TS_DIRTY,y
+                 bne  :occupied2
+
+                 inc                                  ; any non-zero value will work
+                 sta  TileStore+TS_DIRTY,y            ; and is 1 cycle faster than loading a constant value
+
+                 tya
+                 ldy  DirtyTileCount ; 4
+                 sta  DirtyTiles,y   ; 6
+                 iny                 ; 2
+                 iny                 ; 2
+                 sty  DirtyTileCount ; 4 = 18
+                 rts
+:occupied2
+                 tya                                ; Make sure TileStore offset is returned in the accumulator
+                 rts
+
+; Remove a dirty tile from the list and return it in state ready to be rendered.  It is important
+; that the core rendering functions *only* use _PopDirtyTile to get a list of tiles to update.
+_PopDirtyTile
+                 ldy  DirtyTileCount
+                 bne  _PopDirtyTile2
+                 rts
+
+_PopDirtyTile2                                       ; alternate entry point
+                 dey
+                 dey
+                 sty  DirtyTileCount                 ; remove last item from the list
+
+                 ldx  DirtyTiles,y                   ; load the offset into the Tile Store
+                 lda  #$FFFF
+                 stal TileStore+TS_DIRTY,x           ; clear the occupied backlink
+                 rts
+
+; An optimized subroutine that runs through the dirty tile list and executes a callback function
+; for each dirty tile.  This is an unrolled loop, so we avoid the need to track a register and
+; decrement on each iteration.
+;
+; Also, if we are handling less than 8 dirty tiles, we use a code path that does not
+; need to use an index register
+;
+; Bank = Tile Store
+; D    = Page 2
+_PopDirtyTilesFast
+                 ldx  DP2_DIRTY_TILE_COUNT        ; This is pre-multiplied by 2
+                 bne  pdtf_not_empty              ; If there are no items, exit
+at_exit          rts
+pdtf_not_empty
+                 cpx  #16                         ; If there are >= 8 elements, then
+                 bcs  full_chunk                  ; do a full chunk
+
+                 jmp  (at_table,x)
+at_table         da   at_exit,at_one,at_two,at_three
+                 da   at_four,at_five,at_six,at_seven
+
+full_chunk       txa
+                 sbc  #16                         ; carry set from branch
+                 sta  DP2_DIRTY_TILE_COUNT        ; fall through
+                 tay                              ; use the Y-register for the index
+
+; Because all of the registers get used in the subroutine, we
+; push the values from the DirtyTiles array onto the stack and then pop off
+; the values as we go
+
+                 ldx   DirtyTiles+14,y
+                 stz   TileStore+TS_DIRTY,x
+                 jsr   _RenderTile
+
+                 ldy   DP2_DIRTY_TILE_COUNT
+                 ldx   DirtyTiles+12,y
+                 stz   TileStore+TS_DIRTY,x
+                 jsr   _RenderTile
+
+                 ldy   DP2_DIRTY_TILE_COUNT
+                 ldx   DirtyTiles+10,y
+                 stz   TileStore+TS_DIRTY,x
+                 jsr   _RenderTile
+
+                 ldy   DP2_DIRTY_TILE_COUNT
+                 ldx   DirtyTiles+8,y
+                 stz   TileStore+TS_DIRTY,x
+                 jsr   _RenderTile
+
+                 ldy   DP2_DIRTY_TILE_COUNT
+                 ldx   DirtyTiles+6,y
+                 stz   TileStore+TS_DIRTY,x
+                 jsr   _RenderTile
+
+                 ldy   DP2_DIRTY_TILE_COUNT
+                 ldx   DirtyTiles+4,y
+                 stz   TileStore+TS_DIRTY,x
+                 jsr   _RenderTile
+
+                 ldy   DP2_DIRTY_TILE_COUNT
+                 ldx   DirtyTiles+2,y
+                 stz   TileStore+TS_DIRTY,x
+                 jsr   _RenderTile
+
+                 ldy   DP2_DIRTY_TILE_COUNT
+                 ldx   DirtyTiles+0,y
+                 stz   TileStore+TS_DIRTY,x
+                 jsr   _RenderTile
+                 jmp   _PopDirtyTilesFast
+
+; These routines just handle between 1 and 7 dirty tiles
+at_seven
+                 ldx   DirtyTiles+12
+                 stz   TileStore+TS_DIRTY,x
+                 jsr   _RenderTile
+
+at_six
+                 ldx   DirtyTiles+10
+                 stz   TileStore+TS_DIRTY,x
+                 jsr   _RenderTile
+
+at_five
+                 ldx   DirtyTiles+8
+                 stz   TileStore+TS_DIRTY,x
+                 jsr   _RenderTile
+
+at_four
+                 ldx   DirtyTiles+6
+                 stz   TileStore+TS_DIRTY,x
+                 jsr   _RenderTile
+
+at_three
+                 ldx   DirtyTiles+4
+                 stz   TileStore+TS_DIRTY,x
+                 jsr   _RenderTile
+
+at_two
+                 ldx   DirtyTiles+2
+                 stz   TileStore+TS_DIRTY,x
+                 jsr   _RenderTile
+
+at_one
+                 ldx   DirtyTiles+0
+                 stz   TileStore+TS_DIRTY,x
+                 jmp   _RenderTile