From 7cf56b55a89c28ef5f1e98faa35b4289e19d4223 Mon Sep 17 00:00:00 2001
From: Steven Hugg <hugg@fasterlight.com>
Date: Sun, 26 Aug 2018 09:19:09 -0400
Subject: [PATCH] fixed VCS macro/loadROM; download all files menu option;
 error on build exception fix; PAL preset; 262 for VCS presets

---
 index.html                           |  4 +-
 presets/vcs/examples/bigsprite.a     |  2 +-
 presets/vcs/examples/bitmap.a        |  2 +-
 presets/vcs/examples/brickgame.a     | 16 +++---
 presets/vcs/examples/collisions.a    |  6 +--
 presets/vcs/examples/complexscene.a  |  3 +-
 presets/vcs/examples/complexscene2.a |  6 ++-
 presets/vcs/examples/fracpitch.a     |  8 +--
 presets/vcs/examples/lines.a         |  5 +-
 presets/vcs/examples/missiles.a      |  4 +-
 presets/vcs/examples/multisprite3.a  | 23 +++++---
 presets/vcs/examples/musicplayer.a   |  2 +-
 presets/vcs/examples/pal.a           | 78 ++++++++++++++++++++++++++++
 presets/vcs/examples/playfield.a     |  6 +--
 presets/vcs/examples/procgen1.a      |  5 +-
 presets/vcs/examples/retrigger.a     |  2 +-
 presets/vcs/examples/road.a          |  7 ++-
 presets/vcs/examples/score6.a        |  2 +-
 presets/vcs/examples/scoreboard.a    |  2 +-
 presets/vcs/examples/sprite.a        |  6 +--
 presets/vcs/examples/timing2.a       |  8 +--
 presets/vcs/examples/tinyfonts2.a    |  2 +-
 presets/vcs/xmacro.h                 | 16 ++++--
 src/platform/vcs.ts                  |  5 ++
 src/ui.ts                            | 34 +++++++++++-
 src/windows.ts                       |  4 +-
 26 files changed, 191 insertions(+), 67 deletions(-)
 create mode 100644 presets/vcs/examples/pal.a

diff --git a/index.html b/index.html
index 5f6c0587..76b0afde 100644
--- a/index.html
+++ b/index.html
@@ -54,7 +54,8 @@ if (window.location.host.endsWith('8bitworkshop.com')) {
         <ul class="dropdown-menu">
           <li><a class="dropdown-item" href="#" id="item_download_file">Download Source File</a></li>
           <li><a class="dropdown-item" href="#" id="item_download_rom">Download ROM Image</a></li>
-          <li><a class="dropdown-item" href="#" id="item_download_zip">Download ZIP Archive</a></li>
+          <li><a class="dropdown-item" href="#" id="item_download_zip">Download Project as ZIP</a></li>
+          <li><a class="dropdown-item" href="#" id="item_download_allzip">Download All Changes as ZIP</a></li>
         </ul>
       </li>
       <li class="dropdown dropdown-submenu">
@@ -274,7 +275,6 @@ if (window.location.host.endsWith('8bitworkshop.com')) {
 <script src="codemirror/addon/dialog/dialog.js"></script>
 <script src="codemirror/addon/selection/active-line.js"></script>
 <link rel="stylesheet" href="codemirror/addon/dialog/dialog.css">
-
 <script src="javatari.js/release/javatari/javatari.js"></script>
 <!--
 <script src="javatari.js/src/main/Javatari.js"></script>
diff --git a/presets/vcs/examples/bigsprite.a b/presets/vcs/examples/bigsprite.a
index 5cba4ced..a78ffca7 100644
--- a/presets/vcs/examples/bigsprite.a
+++ b/presets/vcs/examples/bigsprite.a
@@ -75,7 +75,7 @@ BigLoop
 
         TIMER_WAIT
 
-	TIMER_SETUP 30
+	TIMER_SETUP 29
         TIMER_WAIT
         jmp NextFrame
 
diff --git a/presets/vcs/examples/bitmap.a b/presets/vcs/examples/bitmap.a
index 9d0317b6..ef45aa0c 100644
--- a/presets/vcs/examples/bitmap.a
+++ b/presets/vcs/examples/bitmap.a
@@ -57,7 +57,7 @@ ScanLoop
         sta PF1
         sta PF2		; clear playfield
 
-	TIMER_SETUP 29
+	TIMER_SETUP 28
         TIMER_WAIT
         jmp NextFrame
 
diff --git a/presets/vcs/examples/brickgame.a b/presets/vcs/examples/brickgame.a
index 72b30e96..d876769f 100644
--- a/presets/vcs/examples/brickgame.a
+++ b/presets/vcs/examples/brickgame.a
@@ -1,4 +1,4 @@
-
+j
 	processor 6502
         include "vcs.h"
         include "macro.h"
@@ -227,7 +227,7 @@ ScanLoop3b
         sta Temp		; 'brickheight' scan lines for each row
         cpy #NBrickRows		; done drawing all brick rows?
         bcc ScanSkipSync	; no -- but don't have time to draw ball!
-        jmp DoneBrickDraw	; exit outer loop
+        bcs DoneBrickDraw	; exit outer loop
 ScanLoop3a
 ; These instructions are skipped on lines after the brick row changes.
 ; We need the extra cycles.
@@ -260,7 +260,7 @@ ScanSkipSync
         bne ScanLoop3a	; branch always taken
 ; Clear playfield from bricks loop
 DoneBrickDraw
-	SLEEP 6
+	sta WSYNC
 	lda #0
         sta PF0
         sta PF1
@@ -310,7 +310,7 @@ ScanLoop5
         lda #0
         sta GRP0
         inx
-        cpx #192
+        cpx #190
         bne ScanLoop5
 
 ; Disable ball
@@ -319,11 +319,11 @@ ScanLoop5
 
 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
 
-; 30 lines of overscan needed, but we have lots of logic to do.
+; 29 lines of overscan needed, but we have lots of logic to do.
 ; So we're going to use the PIA timer to let us know when
-; almost 30 lines of overscan have passed.
+; almost 29 lines of overscan have passed.
 ; This handy macro does a WSYNC and then sets up the timer.
-	TIMER_SETUP 30
+	TIMER_SETUP 29
 
 ; Check for collisions
         lda #%01000000
@@ -507,7 +507,7 @@ SkipMoveRight
 NoAudio
 
 ; Wait until our timer expires and then WSYNC, so then we'll have
-; passed 30 scanlines. This handy macro does this.
+; passed 29 scanlines. This handy macro does this.
 	TIMER_WAIT
 ; Goto next frame
         jmp NextFrame
diff --git a/presets/vcs/examples/collisions.a b/presets/vcs/examples/collisions.a
index a824c560..1886c87b 100644
--- a/presets/vcs/examples/collisions.a
+++ b/presets/vcs/examples/collisions.a
@@ -199,11 +199,11 @@ ScanLoop5
 	lda #0
         sta ENABL
 
-; 30 lines of overscan needed, but we have lots of logic to do.
+; 29 lines of overscan needed, but we have lots of logic to do.
 ; So we're going to use the PIA timer to let us know when
-; almost 30 lines of overscan have passed.
+; almost 29 lines of overscan have passed.
 ; This handy macro does a WSYNC and then sets up the timer.
-	TIMER_SETUP 30
+	TIMER_SETUP 29
 
 ; Check for collisions
         lda #%01000000
diff --git a/presets/vcs/examples/complexscene.a b/presets/vcs/examples/complexscene.a
index edc11604..e8f3dc8e 100644
--- a/presets/vcs/examples/complexscene.a
+++ b/presets/vcs/examples/complexscene.a
@@ -74,7 +74,6 @@ NextFrame
         sta HMOVE	; gotta apply HMOVE
 ; Wait for end of VBLANK
 	TIMER_WAIT
-        sta WSYNC
         lda #0
         sta VBLANK
 
@@ -153,7 +152,7 @@ NoMoreSegs
         TIMER_WAIT
 
 ; Set up overscan timer
-	TIMER_SETUP 30
+	TIMER_SETUP 29
 	lda #2
         sta VBLANK
         jsr MoveJoystick
diff --git a/presets/vcs/examples/complexscene2.a b/presets/vcs/examples/complexscene2.a
index 4a9ee18c..76defb66 100644
--- a/presets/vcs/examples/complexscene2.a
+++ b/presets/vcs/examples/complexscene2.a
@@ -42,7 +42,9 @@ SpriteHeight	equ 16
 
 Start
 	CLEAN_START
+
 Data0        
+; set up pointers to playfield and sprites
         lda #<Data0
         sta PFPtr
         lda #>Data0
@@ -63,6 +65,7 @@ Data0
         sta ColorPtr1
         lda #>ColorFrame0
         sta ColorPtr1+1
+; set up initial positions
         lda #242
         sta YPos0
         lda #200
@@ -103,7 +106,6 @@ NextFrame
         sta HMOVE	; gotta apply HMOVE
 ; Wait for end of VBLANK
 	TIMER_WAIT
-        sta WSYNC
         lda #0
         sta VBLANK
         SLEEP 31	; so timing analysis works out
@@ -144,7 +146,7 @@ KernelLoop
 
 NoMoreLines
 ; Set up overscan timer
-	TIMER_SETUP 30
+	TIMER_SETUP 27
 	lda #2
         sta VBLANK
         jsr MoveJoystick
diff --git a/presets/vcs/examples/fracpitch.a b/presets/vcs/examples/fracpitch.a
index d1559bd9..9402dc04 100644
--- a/presets/vcs/examples/fracpitch.a
+++ b/presets/vcs/examples/fracpitch.a
@@ -51,20 +51,20 @@ BitmapY		equ	$f0	; next line of bitmap
 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
 
 	MAC PULSE
-        TIMER_SETUP 35
+        TIMER_SETUP 33
         jsr DutyCycle	; cycle notes
         jsr Pulse	; decrement duration timer
         lda Chan0note
         sta COLUBK
         lda Chan1note
         sta COLUPF
-        jsr DrawBitmap	; draw ~34 lines of bitmap
+        jsr DrawBitmap	; draw ~33 lines of bitmap
         ENDM
 
 	MAC DUTYCYCLE
-        TIMER_SETUP 34
+        TIMER_SETUP 32
         jsr DutyCycle	; cycle notes
-        jsr DrawBitmap	; draw ~33 lines of bitmap
+        jsr DrawBitmap	; draw ~32 lines of bitmap
         ENDM
 
 Start
diff --git a/presets/vcs/examples/lines.a b/presets/vcs/examples/lines.a
index 1dc3013b..c245faf8 100644
--- a/presets/vcs/examples/lines.a
+++ b/presets/vcs/examples/lines.a
@@ -43,11 +43,8 @@ NextFrame
 	jsr SetHorizPos
         sta WSYNC
         sta HMOVE
-
 	TIMER_WAIT
 
-	TIMER_SETUP 192
-
         lda #$54
         sta COLUP0
         ldy #0
@@ -87,7 +84,7 @@ NoLine
         jmp NextScan
 DoneLine
 
-	TIMER_SETUP 30
+	TIMER_SETUP 29
 
 ; Change slope of line
         lda Slope
diff --git a/presets/vcs/examples/missiles.a b/presets/vcs/examples/missiles.a
index 14b98997..87fd8a28 100644
--- a/presets/vcs/examples/missiles.a
+++ b/presets/vcs/examples/missiles.a
@@ -48,8 +48,8 @@ start	CLEAN_START
 nextframe
 	VERTICAL_SYNC
 	
-; 37 lines of VBLANK
-	ldx #37
+; 36 lines of VBLANK
+	ldx #36
 lvblank	sta WSYNC
 	dex
 	bne lvblank
diff --git a/presets/vcs/examples/multisprite3.a b/presets/vcs/examples/multisprite3.a
index 03476027..fff20c8d 100644
--- a/presets/vcs/examples/multisprite3.a
+++ b/presets/vcs/examples/multisprite3.a
@@ -77,6 +77,15 @@ MinYDist	equ 7	; min. Y distance to consider sprite
 .Ok
         ENDM
 
+; Set the timer value to $FF.
+; Use this at the beginning of a region to start
+; using timer table routines.
+	MAC TIMER_TABLE_SETUP
+    	lda #$FF
+        sta WSYNC
+        sta TIM64T
+	ENDM
+
 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
 
 	seg Code
@@ -115,7 +124,7 @@ InitLoop2
 NextFrame
 ; VSYNC and VBLANK periods
 	VERTICAL_SYNC
-	TIMER_SETUP 24
+	TIMER_SETUP 27
 ; Do joystick movement
         jsr MoveJoystick
 ; Do one iteration of bubble sort on sprite indices
@@ -135,9 +144,9 @@ SortLoop
 ; end of VBLANK
 
 ; Scanline loop
-        TIMER_SETUP 216	; timer <- #$ff
         lda #$90
         sta COLUBK
+        TIMER_TABLE_SETUP
 NextFindSprite
 ; Try to schedule sprites to both players
 	jsr FindAnotherSprite
@@ -163,8 +172,8 @@ NoMoreScanlines
 	stx COLUP0
 	stx COLUP1
 	stx COLUPF
-; 30-2 lines of overscan
-	TIMER_SETUP 28
+; 29 lines of overscan
+	TIMER_SETUP 29
         TIMER_WAIT
 ; Go to next frame
 	jmp NextFrame
@@ -381,7 +390,7 @@ MoveJoystick subroutine
 	lda #%00010000	;Up?
 	bit SWCHA
 	bne .SkipMoveUp
-        cpx #8
+        cpx #10
         bcc .SkipMoveUp
         dex
 .SkipMoveUp
@@ -420,9 +429,7 @@ MoveJoystick subroutine
 ;  X=2: missile 0
 ;  X=3: missile 1
 ;  X=4: ball
-; NOTE: This version of the routine does a NEWLINE after executing
-; because when the beam is at the far right side of the screen
-; there is little time to do so before wrapping to the next line.
+; NOTE: This version of the routine does a NEWLINE before executing.
 ; It does NOT do a HMOVE and HCLR.
 SetHorizPos subroutine
 	sta WSYNC	; start a new line
diff --git a/presets/vcs/examples/musicplayer.a b/presets/vcs/examples/musicplayer.a
index d41b24ac..11de0e9d 100644
--- a/presets/vcs/examples/musicplayer.a
+++ b/presets/vcs/examples/musicplayer.a
@@ -84,7 +84,7 @@ NextFrame
         TIMER_WAIT
 	TIMER_SETUP 192
         TIMER_WAIT
-	TIMER_SETUP 30
+	TIMER_SETUP 29
         TIMER_WAIT
         jmp NextFrame
 
diff --git a/presets/vcs/examples/pal.a b/presets/vcs/examples/pal.a
new file mode 100644
index 00000000..d682bb55
--- /dev/null
+++ b/presets/vcs/examples/pal.a
@@ -0,0 +1,78 @@
+
+	processor 6502
+	include "vcs.h"
+	include "macro.h"
+	include "xmacro.h"
+
+	org  $f000
+
+; To output a PAL signal, you need the following:
+;
+; - 3 scanlines of VSYNC
+; - 45 blank lines
+; - 228 visible scanlines
+; - 36 blank lines
+;
+; Total = 312 lines (vs 262 for NTSC)
+
+; PAL runs at 50 Hz (vs 60 Hz for NTSC)
+; so your game will run more slowly.
+; Since you have extra cycles to play with, you could just
+; call your position update routine twice every five frames.
+
+; Note also that PAL has different colors than NTSC.
+; (See http://www.randomterrain.com/atari-2600-memories-tia-color-charts.html)
+
+; The TIMER_SETUP macro only goes up to 215 lines,
+; so for the PAL visible frame you would need to use
+; multiple sections (say 215 + 13 = 228) or count manually
+; like we do in this example.
+
+; Many VCS games use conditional defines
+; (IFCONST and IFNCONST in DASM)
+; to switch between NTSC and PAL constants.
+
+; background color
+BGColor	equ $81
+
+; Start of program, init registers and clear memory
+Start	CLEAN_START
+
+NextFrame
+; 01 + 3 lines of VSYNC
+	VERTICAL_SYNC
+; Now we need 44 lines of VBLANK...
+	TIMER_SETUP 44
+        TIMER_WAIT
+; Re-enable output (disable VBLANK)
+	lda #0
+        sta VBLANK
+; 228 PAL scanlines are visible
+; We'll draw some rainbows
+	ldx #228
+	lda BGColor	; load the background color out of RAM
+ScanLoop
+	adc #1		; add 1 to the current background color in A
+	sta COLUBK	; set the background color
+	sta WSYNC	; WSYNC doesn't care what value is stored
+	dex
+	bne ScanLoop
+
+; 36 lines of overscan to complete the frame
+	TIMER_SETUP 36
+; Enable VBLANK again
+	lda #2
+        sta VBLANK
+        TIMER_WAIT
+	
+; The next frame will start with current color value - 1
+; to get a downwards scrolling effect
+	dec BGColor
+
+; Go back and do another frame
+	jmp NextFrame
+
+; 6502 vectors
+	org $fffc
+	.word Start
+	.word Start
diff --git a/presets/vcs/examples/playfield.a b/presets/vcs/examples/playfield.a
index c077272b..71b9f5c8 100644
--- a/presets/vcs/examples/playfield.a
+++ b/presets/vcs/examples/playfield.a
@@ -15,11 +15,11 @@ Counter	equ $81
 Start	CLEAN_START
 
 NextFrame
-; This macro efficiently gives us 3 lines of VSYNC
+; This macro efficiently gives us 1 + 3 lines of VSYNC
 	VERTICAL_SYNC
 	
-; 37 lines of VBLANK
-	ldx #37
+; 36 lines of VBLANK
+	ldx #36
 LVBlank	sta WSYNC
 	dex
 	bne LVBlank
diff --git a/presets/vcs/examples/procgen1.a b/presets/vcs/examples/procgen1.a
index 0d4d4d97..26d08c2b 100644
--- a/presets/vcs/examples/procgen1.a
+++ b/presets/vcs/examples/procgen1.a
@@ -79,7 +79,7 @@ NextFrame
 ; Set up VBLANK timer
 ; We'll do four fewer lines than usual, so we can
 ; load the playfield registers in the first four lines.
-	TIMER_SETUP 33
+	TIMER_SETUP 37-4
         lda #$68
         sta COLUP0	; player color
         lda #1
@@ -102,7 +102,6 @@ NextFrame
         sta CXCLR	; clear collisions
 ; Wait for end of VBLANK
 	TIMER_WAIT
-        sta WSYNC
 
 KernelLoop
 ; Phase 0: Fetch PF0 byte
@@ -133,7 +132,7 @@ NoMoreLines
 
 ; Set up overscan timer
 ; We'll take back those four lines we skipped earlier.
-	TIMER_SETUP 34
+	TIMER_SETUP 30+4
         lda #0
         sta PF0
         sta PF1
diff --git a/presets/vcs/examples/retrigger.a b/presets/vcs/examples/retrigger.a
index b8b621c1..cf7549fa 100644
--- a/presets/vcs/examples/retrigger.a
+++ b/presets/vcs/examples/retrigger.a
@@ -80,7 +80,7 @@ NextFrame
         sta ENABL
         sta ENAM1	; turn off missile and ball
 ; Overscan
-	TIMER_SETUP 30
+	TIMER_SETUP 29
         TIMER_WAIT
         lda #0
         sta COLUBK	; clear ground color
diff --git a/presets/vcs/examples/road.a b/presets/vcs/examples/road.a
index 2f923a43..b02e32fd 100644
--- a/presets/vcs/examples/road.a
+++ b/presets/vcs/examples/road.a
@@ -1,4 +1,3 @@
-
 	processor 6502
         include "vcs.h"
         include "macro.h"
@@ -74,9 +73,9 @@ NextFrame
         lda #10		; initial lookahead
         sta TrackLookahead
 
-; VSYNC+36+198+24 = 4+258 = 262 lines
+; VSYNC+37+198+23 = 4+258 = 262 lines
 
-	TIMER_SETUP 36
+	TIMER_SETUP 37
 
 ; Initialize array with X road positions
         jsr PreprocessCurve
@@ -92,7 +91,7 @@ NextFrame
         
         TIMER_WAIT
         
-	TIMER_SETUP 24
+	TIMER_SETUP 23
 ; Advance position on track
 ; TrackFrac += Speed
 	lda TrackFrac
diff --git a/presets/vcs/examples/score6.a b/presets/vcs/examples/score6.a
index a0dc3e70..4595e0f4 100644
--- a/presets/vcs/examples/score6.a
+++ b/presets/vcs/examples/score6.a
@@ -64,7 +64,7 @@ NextFrame
 
         TIMER_WAIT
 
-	TIMER_SETUP 30
+	TIMER_SETUP 29
         lda #$01
         ldx #$00
         ldy #$00
diff --git a/presets/vcs/examples/scoreboard.a b/presets/vcs/examples/scoreboard.a
index e817a1ff..e4f1e53c 100644
--- a/presets/vcs/examples/scoreboard.a
+++ b/presets/vcs/examples/scoreboard.a
@@ -74,7 +74,7 @@ ScanLoop1a
         sta CTRLPF
 
         TIMER_WAIT
-	TIMER_SETUP 30
+	TIMER_SETUP 29
         TIMER_WAIT
         jmp NextFrame
 
diff --git a/presets/vcs/examples/sprite.a b/presets/vcs/examples/sprite.a
index 2916757a..4c593f09 100644
--- a/presets/vcs/examples/sprite.a
+++ b/presets/vcs/examples/sprite.a
@@ -20,11 +20,11 @@ Counter	equ $81
 Start	CLEAN_START
 
 NextFrame
-; This macro efficiently gives us 3 lines of VSYNC
+; This macro efficiently gives us 1 + 3 lines of VSYNC
 	VERTICAL_SYNC
 	
-; 37 lines of VBLANK
-	ldx #37
+; 36 lines of VBLANK
+	ldx #36
 LVBlank	sta WSYNC
 	dex
 	bne LVBlank
diff --git a/presets/vcs/examples/timing2.a b/presets/vcs/examples/timing2.a
index d1f93498..86692236 100644
--- a/presets/vcs/examples/timing2.a
+++ b/presets/vcs/examples/timing2.a
@@ -20,8 +20,8 @@ start	CLEAN_START
 nextframe
 	VERTICAL_SYNC
 	
-; 37 lines of VBLANK
-	ldx #35
+; 34 lines of VBLANK
+	ldx #34
 lvblank	sta WSYNC
 	dex
 	bne lvblank
@@ -36,7 +36,7 @@ lvblank	sta WSYNC
 ; The easy way on the 6502 is to subtract in a loop.
 ; Note that this also conveniently adds 5 CPU cycles
 ; (15 TIA clocks) per iteration.
-	sta WSYNC	; 36th line
+	sta WSYNC	; 35th line
 	sta HMCLR	; reset the old horizontal position
 DivideLoop
 	sbc #15		; subtract 15
@@ -56,7 +56,7 @@ DivideLoop
 ; previous instructions, position 0 won't be exactly on the left side.
 	sta RESP0
 ; Finally we'll do a WSYNC followed by HMOVE to apply the fine offset.
-	sta WSYNC	; 37th line
+	sta WSYNC	; 36th line
 	sta HMOVE	; apply offset
 
 ; We'll see this method again, and it can be made into a subroutine
diff --git a/presets/vcs/examples/tinyfonts2.a b/presets/vcs/examples/tinyfonts2.a
index 5b838033..fb80aae1 100644
--- a/presets/vcs/examples/tinyfonts2.a
+++ b/presets/vcs/examples/tinyfonts2.a
@@ -76,7 +76,7 @@ NextFrame
 
         TIMER_WAIT
 
-	TIMER_SETUP 30
+	TIMER_SETUP 29
         TIMER_WAIT
         jmp NextFrame
 
diff --git a/presets/vcs/xmacro.h b/presets/vcs/xmacro.h
index dffb20a5..3529db53 100644
--- a/presets/vcs/xmacro.h
+++ b/presets/vcs/xmacro.h
@@ -7,18 +7,26 @@
 
     MAC TIMER_SETUP
 .lines  SET {1}
-        lda #(((.lines-1)*76-14)/64)
-        sta WSYNC
+.cycles SET ((.lines * 76) - 13)
+; special case for when we have two timer events in a line
+; and our 2nd event straddles the WSYNC boundary
+	if (.cycles % 64) < 12
+		lda #(.cycles / 64) - 1
+		sta WSYNC
+        else
+		lda #(.cycles / 64)
+		sta WSYNC
+        endif
         sta TIM64T
     ENDM
 
 ;-------------------------------------------------------
 ; Use with TIMER_SETUP to wait for timer to complete.
-; You may want to do a WSYNC afterwards, since the timer
-; is not accurate to the beginning/end of a scanline.
+; Performs a WSYNC afterwards.
 
     MAC TIMER_WAIT
 .waittimer
         lda INTIM
         bne .waittimer
+        sta WSYNC
     ENDM
diff --git a/src/platform/vcs.ts b/src/platform/vcs.ts
index 548c2d8c..bd140cc7 100644
--- a/src/platform/vcs.ts
+++ b/src/platform/vcs.ts
@@ -37,6 +37,7 @@ const VCS_PRESETS = [
   {id:'examples/bankswitching', chapter:35, name:'Bankswitching'},
   {id:'examples/wavetable', chapter:36, name:'Wavetable Sound'},
   {id:'examples/fracpitch', name:'Fractional Pitch'},
+  {id:'examples/pal', name:'PAL Video Output'},
 //  {id:'examples/music2', name:'Pitch-Accurate Music'},
 //  {id:'examples/fullgame', name:'Thru Hike: The Game', title:'Thru Hike'},
 ];
@@ -66,8 +67,12 @@ class VCSPlatform {
   }
 
   loadROM(title, data) {
+    if (data.length == 0 || ((data.length & 0x3ff) != 0))
+      throw Error("Invalid ROM length: " + data.length);
+    // TODO: parse Log messages from Javatari?
     var wasrunning = this.isRunning();
     Javatari.loadROM(title, data);
+    if (!this.isRunning()) throw Error("Could not load ROM");
     if (!wasrunning) this.pause();
   }
 
diff --git a/src/ui.ts b/src/ui.ts
index fb5f87f4..a3ffb1d3 100644
--- a/src/ui.ts
+++ b/src/ui.ts
@@ -352,8 +352,14 @@ function _shareEmbedLink(e) {
   return true;
 }
 
+function fixFilename(fn : string) : string {
+  if (platform_id.startsWith('vcs') && fn.indexOf('.') <= 0)
+    fn += ".a"; // legacy stuff
+  return fn;
+}
+
 function _revertFile(e) {
-  var fn = getCurrentEditorFilename();
+  var fn = fixFilename(projectWindows.getActiveID());
   $.get( "presets/"+platform_id+"/"+fn, function(text) {
     if (confirm("Reset '" + fn + "' to default?")) {
       projectWindows.getActive().setText(text);
@@ -394,6 +400,28 @@ function _downloadProjectZipFile(e) {
   });
 }
 
+function _downloadAllFilesZipFile(e) {
+  loadScript('lib/jszip.min.js', () => {
+    var zip = new JSZip();
+    var count = 0;
+    store.keys( (err, keys : string[]) => {
+      if (err) throw err;
+      keys.forEach((path) => {
+        store.getItem(path, (err, text) => {
+          if (text) {
+            zip.file(fixFilename(getFilenameForPath(path)), text);
+          }
+          if (++count == keys.length) {
+            zip.generateAsync({type:"blob"}).then( (content) => {
+              saveAs(content, platform_id + "-all.zip");
+            });
+          }
+        });
+      });
+    });
+  });
+}
+
 function populateExamples(sel) {
   // make sure to use callback so it follows other sections
   store.length(function(err, len) {
@@ -467,8 +495,9 @@ function setCompileOutput(data: WorkerResult) {
       } catch (e) {
         console.log(e);
         toolbar.addClass("has-errors");
-        projectWindows.setErrors([{line:1,msg:e+""}]); // TODO: doesn't work
+        projectWindows.setErrors([{line:1,msg:e+""}]); // TODO: doesn't work (use alert?)
         current_output = null;
+        return;
       }
     }
     // update all windows (listings)
@@ -816,6 +845,7 @@ function setupDebugControls(){
   $("#item_download_rom").click(_downloadROMImage);
   $("#item_download_file").click(_downloadSourceFile);
   $("#item_download_zip").click(_downloadProjectZipFile);
+  $("#item_download_allzip").click(_downloadAllFilesZipFile);
   $("#item_record_video").click(_recordVideo);
   if (platform.setFrameRate && platform.getFrameRate) {
     $("#speed_bar").show();
diff --git a/src/windows.ts b/src/windows.ts
index 21b9e443..de1ab784 100644
--- a/src/windows.ts
+++ b/src/windows.ts
@@ -72,10 +72,10 @@ export class ProjectWindows {
     this.refreshErrors();
   }
   
-  refreshErrors(embedlines?:boolean) {
+  refreshErrors() {
     if (this.activewnd && this.activewnd.markErrors) {
       if (this.lasterrors && this.lasterrors.length)
-        this.activewnd.markErrors(this.lasterrors); // TODO?, embedlines);
+        this.activewnd.markErrors(this.lasterrors);
       else
         this.activewnd.clearErrors();
     }