diff --git a/A2Mac/Base.lproj/Main.storyboard b/A2Mac/Base.lproj/Main.storyboard
index 2c199ce..6b555a0 100644
--- a/A2Mac/Base.lproj/Main.storyboard
+++ b/A2Mac/Base.lproj/Main.storyboard
@@ -795,7 +795,7 @@
                         <subviews>
                             <textField canDrawConcurrently="YES" verticalHuggingPriority="750" horizontalCompressionResistancePriority="250" mirrorLayoutDirectionWhenInternationalizing="never" textCompletion="NO" translatesAutoresizingMaskIntoConstraints="NO" id="iIF-Q5-Onc">
                                 <rect key="frame" x="0.0" y="0.0" width="1152" height="800"/>
-                                <textFieldCell key="cell" lineBreakMode="truncatingTail" enabled="NO" allowsUndo="NO" sendsActionOnEndEditing="YES" state="on" baseWritingDirection="leftToRight" title="Display Background" drawsBackground="YES" id="cIa-Sd-4OZ">
+                                <textFieldCell key="cell" lineBreakMode="truncatingTail" enabled="NO" refusesFirstResponder="YES" allowsUndo="NO" sendsActionOnEndEditing="YES" state="on" baseWritingDirection="leftToRight" title="Display Background" drawsBackground="YES" id="cIa-Sd-4OZ">
                                     <font key="font" metaFont="system"/>
                                     <color key="textColor" red="0.078431372549019607" green="0.10980392156862745" blue="0.078431372549019607" alpha="1" colorSpace="custom" customColorSpace="sRGB"/>
                                     <color key="backgroundColor" red="0.078431372549019607" green="0.10980392156862745" blue="0.078431372549019607" alpha="1" colorSpace="custom" customColorSpace="sRGB"/>
@@ -859,7 +859,7 @@
                                                 <constraints>
                                                     <constraint firstAttribute="height" constant="21" id="t2i-0h-wau"/>
                                                 </constraints>
-                                                <buttonCell key="cell" type="push" title="Power" bezelStyle="rounded" alignment="center" borderStyle="border" imageScaling="proportionallyDown" inset="2" id="hmD-vF-EXJ">
+                                                <buttonCell key="cell" type="push" title="Power" bezelStyle="rounded" alignment="center" refusesFirstResponder="YES" borderStyle="border" imageScaling="proportionallyDown" inset="2" id="hmD-vF-EXJ">
                                                     <behavior key="behavior" pushIn="YES" lightByBackground="YES" lightByGray="YES"/>
                                                     <font key="font" metaFont="system"/>
                                                 </buttonCell>
@@ -872,7 +872,7 @@
                                                 <constraints>
                                                     <constraint firstAttribute="height" constant="21" id="sbX-nh-SV3"/>
                                                 </constraints>
-                                                <buttonCell key="cell" type="push" title="Reset" bezelStyle="rounded" alignment="center" borderStyle="border" imageScaling="proportionallyDown" inset="2" id="LHj-7W-LwD">
+                                                <buttonCell key="cell" type="push" title="Reset" bezelStyle="rounded" alignment="center" refusesFirstResponder="YES" borderStyle="border" imageScaling="proportionallyDown" inset="2" id="LHj-7W-LwD">
                                                     <behavior key="behavior" pushIn="YES" lightByBackground="YES" lightByGray="YES"/>
                                                     <font key="font" metaFont="system"/>
                                                     <connections>
@@ -902,7 +902,7 @@
                                                 <constraints>
                                                     <constraint firstAttribute="height" constant="17" id="ai1-6C-5tW"/>
                                                 </constraints>
-                                                <textFieldCell key="cell" lineBreakMode="clipping" alignment="center" title="Label" id="FBZ-dh-6Fs">
+                                                <textFieldCell key="cell" lineBreakMode="clipping" refusesFirstResponder="YES" alignment="center" title="Label" id="FBZ-dh-6Fs">
                                                     <font key="font" metaFont="system"/>
                                                     <color key="textColor" name="labelColor" catalog="System" colorSpace="catalog"/>
                                                     <color key="backgroundColor" name="textBackgroundColor" catalog="System" colorSpace="catalog"/>
@@ -913,7 +913,7 @@
                                                 <constraints>
                                                     <constraint firstAttribute="height" constant="17" id="xCE-LE-hVy"/>
                                                 </constraints>
-                                                <textFieldCell key="cell" lineBreakMode="clipping" alignment="left" title="CPU Speed" id="b3T-0k-ama">
+                                                <textFieldCell key="cell" lineBreakMode="clipping" refusesFirstResponder="YES" alignment="left" title="CPU Speed" id="b3T-0k-ama">
                                                     <font key="font" metaFont="system"/>
                                                     <color key="textColor" name="labelColor" catalog="System" colorSpace="catalog"/>
                                                     <color key="backgroundColor" name="textBackgroundColor" catalog="System" colorSpace="catalog"/>
@@ -921,7 +921,7 @@
                                             </textField>
                                             <button verticalHuggingPriority="750" translatesAutoresizingMaskIntoConstraints="NO" id="7Pw-e8-92m">
                                                 <rect key="frame" x="-1" y="119" width="55" height="18"/>
-                                                <buttonCell key="cell" type="radio" title="1.023" bezelStyle="regularSquare" imagePosition="left" alignment="left" state="on" inset="2" id="AgQ-Np-TYQ">
+                                                <buttonCell key="cell" type="radio" title="1.023" bezelStyle="regularSquare" imagePosition="left" alignment="left" refusesFirstResponder="YES" state="on" inset="2" id="AgQ-Np-TYQ">
                                                     <behavior key="behavior" changeContents="YES" doesNotDimImage="YES" lightByContents="YES"/>
                                                     <font key="font" metaFont="system"/>
                                                 </buttonCell>
@@ -931,7 +931,7 @@
                                             </button>
                                             <button verticalHuggingPriority="750" translatesAutoresizingMaskIntoConstraints="NO" id="hU1-g7-CCX">
                                                 <rect key="frame" x="-1" y="95" width="30" height="18"/>
-                                                <buttonCell key="cell" type="radio" title="2" bezelStyle="regularSquare" imagePosition="left" alignment="left" inset="2" id="nfH-ww-Ofp">
+                                                <buttonCell key="cell" type="radio" title="2" bezelStyle="regularSquare" imagePosition="left" alignment="left" refusesFirstResponder="YES" inset="2" id="nfH-ww-Ofp">
                                                     <behavior key="behavior" changeContents="YES" doesNotDimImage="YES" lightByContents="YES"/>
                                                     <font key="font" metaFont="system"/>
                                                 </buttonCell>
@@ -941,7 +941,7 @@
                                             </button>
                                             <button verticalHuggingPriority="750" translatesAutoresizingMaskIntoConstraints="NO" id="Hfg-DD-meM">
                                                 <rect key="frame" x="-1" y="71" width="31" height="18"/>
-                                                <buttonCell key="cell" type="radio" title="4" bezelStyle="regularSquare" imagePosition="left" alignment="left" inset="2" id="dqL-yg-qaX">
+                                                <buttonCell key="cell" type="radio" title="4" bezelStyle="regularSquare" imagePosition="left" alignment="left" refusesFirstResponder="YES" inset="2" id="dqL-yg-qaX">
                                                     <behavior key="behavior" changeContents="YES" doesNotDimImage="YES" lightByContents="YES"/>
                                                     <font key="font" metaFont="system"/>
                                                 </buttonCell>
@@ -951,7 +951,7 @@
                                             </button>
                                             <button verticalHuggingPriority="750" translatesAutoresizingMaskIntoConstraints="NO" id="OsQ-RW-v8K">
                                                 <rect key="frame" x="-1" y="47" width="37" height="18"/>
-                                                <buttonCell key="cell" type="radio" title="10" bezelStyle="regularSquare" imagePosition="left" alignment="left" inset="2" id="3Ve-WW-CIS">
+                                                <buttonCell key="cell" type="radio" title="10" bezelStyle="regularSquare" imagePosition="left" alignment="left" refusesFirstResponder="YES" inset="2" id="3Ve-WW-CIS">
                                                     <behavior key="behavior" changeContents="YES" doesNotDimImage="YES" lightByContents="YES"/>
                                                     <font key="font" metaFont="system"/>
                                                 </buttonCell>
@@ -961,7 +961,7 @@
                                             </button>
                                             <button verticalHuggingPriority="750" translatesAutoresizingMaskIntoConstraints="NO" id="vGb-dz-KHi">
                                                 <rect key="frame" x="-1" y="23" width="45" height="18"/>
-                                                <buttonCell key="cell" type="radio" title="100" bezelStyle="regularSquare" imagePosition="left" alignment="left" inset="2" id="BUX-kX-vwG">
+                                                <buttonCell key="cell" type="radio" title="100" bezelStyle="regularSquare" imagePosition="left" alignment="left" refusesFirstResponder="YES" inset="2" id="BUX-kX-vwG">
                                                     <behavior key="behavior" changeContents="YES" doesNotDimImage="YES" lightByContents="YES"/>
                                                     <font key="font" metaFont="system"/>
                                                 </buttonCell>
@@ -971,7 +971,7 @@
                                             </button>
                                             <button verticalHuggingPriority="750" translatesAutoresizingMaskIntoConstraints="NO" id="umb-DW-vGc">
                                                 <rect key="frame" x="-1" y="-1" width="47" height="18"/>
-                                                <buttonCell key="cell" type="radio" title="666" bezelStyle="regularSquare" imagePosition="left" alignment="left" inset="2" id="8VU-4B-7Pe">
+                                                <buttonCell key="cell" type="radio" title="666" bezelStyle="regularSquare" imagePosition="left" alignment="left" refusesFirstResponder="YES" inset="2" id="8VU-4B-7Pe">
                                                     <behavior key="behavior" changeContents="YES" doesNotDimImage="YES" lightByContents="YES"/>
                                                     <font key="font" metaFont="system"/>
                                                 </buttonCell>
diff --git a/A2Mac/HiRes.swift b/A2Mac/HiRes.swift
index 93291be..eefc6cd 100644
--- a/A2Mac/HiRes.swift
+++ b/A2Mac/HiRes.swift
@@ -678,7 +678,7 @@ class HiRes: NSView {
             if videoMode.mixed == 1 {
                 height = HiRes.MixedHeight
             }
-            if videoMode.page == 1 {
+            if videoMode.page2 == 1 {
                 HiResBufferPointer = HiResBuffer2
             }
             else {
diff --git a/A2Mac/ViewController.swift b/A2Mac/ViewController.swift
index 23490c5..993f6ca 100644
--- a/A2Mac/ViewController.swift
+++ b/A2Mac/ViewController.swift
@@ -44,7 +44,7 @@ func spk_dn_play() {
 import Metal
 #endif
 
-class ViewController: NSViewController {
+class ViewController: NSViewController  {
 
     @IBOutlet weak var displayField: NSTextField!
     @IBOutlet weak var display: NSTextFieldCell!
@@ -139,21 +139,32 @@ class ViewController: NSViewController {
     
     static let textBaseAddr = 0x400
     static let textBufferSize = 0x400
-    let textLines = 24
-    let textCols = 40
-    let lineEndChars = 1
-    
+
+    // static only needed to be able to initialize things
+    static let textLines = 24
+    static let textCols = 40
+    static let lineEndChars = 1
+
+    // these are needed to be able to easy access to these constants from instances
+    let textLines = ViewController.textLines
+    let textCols = ViewController.textCols
+    let lineEndChars = ViewController.lineEndChars
+
     var frameCnt = 0
 //    let spaceChar : Character = "\u{E17F}"
 //    let blockChar : Character = "\u{E07F}"
-    let spaceChar : Character = " "
-    let blockChar : Character = "░"
-    var flashingSpace : Character = " "
+//    static let spaceChar : Character = " "
+//    static let blockChar : Character = "░"
+//    static var flashingSpace : Character = " "
     
     let ramBufferPointer = UnsafeRawBufferPointer(start: RAM, count: 64 * 1024)
     let textBufferPointer = UnsafeRawBufferPointer(start: RAM + textBaseAddr, count: textBufferSize)
-    var txtClear = [Character](repeating: " ", count: textBufferSize)
-    var txtArr = [Character](repeating: " ", count: textBufferSize)
+    let textAuxBufferPointer = UnsafeRawBufferPointer(start: AUX_VID_RAM, count: textBufferSize * 2)
+
+    static let textArraySize = textLines * (textCols + lineEndChars) + textCols * 2
+
+    var txtClear = [Character](repeating: " ", count: textArraySize * 2)
+    var txtArr = [Character](repeating: " ", count: textArraySize * 2)
 
     var s = String()
     
@@ -185,6 +196,10 @@ class ViewController: NSViewController {
     
     var ddd = 9;
 
+    override var acceptsFirstResponder: Bool {
+        return true
+    }
+    
     override func keyDown(with event: NSEvent) {
         print("KBD Event")
         
@@ -262,6 +277,7 @@ class ViewController: NSViewController {
             }
             #endif
         }
+        
     }
     
     override func keyUp(with event: NSEvent) {
@@ -351,6 +367,8 @@ class ViewController: NSViewController {
     
     var was = 0;
     
+    var currentVideoMode = videoMode
+    
     func Update() {
 
         #if SPEEDTEST
@@ -396,20 +414,45 @@ class ViewController: NSViewController {
                 let byte = textBufferPointer[ textLineOfs[y] + x ]
                 let idx = Int(byte);
                 let chr = ViewController.charConvTbl[idx]
+                
+                if videoMode.col80 == 0 {
+                    txtArr[ y * (textCols + lineEndChars) + x ] = chr
+                }
+                else {
+                    txtArr[ y * (textCols * 2 + lineEndChars) + x * 2 + 1] = chr
 
-                // is it a cursor? (slashing space)
-//                if ( chr == "blockChar" ) {
-//                    chr = flashingSpace
-//                }
-
-                txtArr[ y * (textCols + lineEndChars) + x ] = chr
+                    let byte = textAuxBufferPointer[ textLineOfs[y] + x ]
+                    let idx = Int(byte);
+                    let chr = ViewController.charConvTbl[idx]
+                    
+                    txtArr[ y * (textCols * 2 + lineEndChars) + x * 2] = chr
+                }
+            }
+            
+            if videoMode.col80 == 0 {
+                txtArr[ y * (textCols + lineEndChars) + textCols ] = "\n"
+            }
+            else {
+                txtArr[ y * (textCols * 2 + lineEndChars) + textCols * 2] = "\n"
             }
-            txtArr[ y * (textCols + lineEndChars) + textCols ] = "\n"
         }
 
         txt = String(txtArr)
 
         DispatchQueue.main.async {
+            if videoMode.col80 != self.currentVideoMode.col80 {
+                self.currentVideoMode.col80 = videoMode.col80
+                
+                if let fontSize = self.display.font?.pointSize {
+                    if videoMode.col80 == 1 {
+                        self.display.font = NSFont(name: "PRNumber3", size: fontSize)
+                    }
+                    else {
+                        self.display.font = NSFont(name: "PrintChar21", size: fontSize)
+                    }
+                }
+            }
+            
             self.display.stringValue = txt
 //            self.display.stringValue = "testing\nit\nout"
 
@@ -456,9 +499,9 @@ class ViewController: NSViewController {
     override func viewDidLoad() {
         super.viewDidLoad()
         
-        for y in 0 ... textLines - 1 {
-            txtClear[ y * (textCols + lineEndChars) + textCols ] = "\n"
-        }
+//        for y in 0 ... textLines - 1 {
+//            txtClear[ y * (textCols + lineEndChars) + textCols * 2 + 1 ] = "\n"
+//        }
 
         woz_loadFile( Bundle.main.resourcePath, "Apple DOS 3.3 January 1983.woz" )
 
@@ -496,13 +539,20 @@ class ViewController: NSViewController {
 //            return $0
 //        }
 
-//        //        NSEvent.removeMonitor(NSEvent.EventType.keyDown)
-//        NSEvent.addLocalMonitorForEvents(matching: .keyDown) {
-////            print("keyDown event")
-//            self.keyDown(with: $0)
+        //        NSEvent.removeMonitor(NSEvent.EventType.keyDown)
+        NSEvent.addLocalMonitorForEvents(matching: .keyDown) {
+//            print("keyDown event")
+            self.keyDown(with: $0)
+            return nil
 //            return $0
-//        }
-        
+        }
+        NSEvent.addLocalMonitorForEvents(matching: .keyUp) {
+//            print("keyUp event")
+            self.keyUp(with: $0)
+            return nil
+//            return $0
+        }
+
         displayField.maximumNumberOfLines = textLines
         displayField.preferredMaxLayoutWidth = displayField.frame.width
 
diff --git a/A2iOS/ViewController.swift b/A2iOS/ViewController.swift
index 7f15472..9ce7d62 100644
--- a/A2iOS/ViewController.swift
+++ b/A2iOS/ViewController.swift
@@ -239,8 +239,8 @@ class ViewController: UIViewController {
     var flashingSpace : Character = " "
     
     let ramBufferPointer = UnsafeRawBufferPointer(start: RAM, count: 64 * 1024)
-    let textBufferPointer = UnsafeRawBufferPointer(start: RAM + textBaseAddr, count: textBufferSize)
-    let txtClear = [Character](repeating: " ", count: textBufferSize)
+    let textBufferPointer = UnsafeRawBufferPointer(start: RAM + textBaseAddr, count: textBufferSize * 2)
+    let txtClear = [Character](repeating: " ", count: textBufferSize * 2)
     var txtArr = txtClear
     
     var s = String()
diff --git a/src/cpu/6502.c b/src/cpu/6502.c
index 86106bc..4355562 100644
--- a/src/cpu/6502.c
+++ b/src/cpu/6502.c
@@ -881,6 +881,8 @@ void rom_loadFile( const char * bundlePath, const char * filename ) {
         read_rom( bundlePath, filename, Apple2_16K_ROM, 0);
         memcpy(Apple2_12K_ROM + 0x0000, Apple2_16K_ROM + 0x1000, sizeof(Apple2_12K_ROM));
         memcpy(Apple2_64K_RAM + 0xC000, Apple2_16K_ROM, 0x1000);
+        
+        SWITCH_CX_ROM( RAM_PG_RD_TBL, 0xC0, Apple2_16K_ROM, 0x00);
     }
     
     else if ( flen == 12 * KB ) {
diff --git a/src/cpu/6502.h b/src/cpu/6502.h
index 547c643..b461834 100644
--- a/src/cpu/6502.h
+++ b/src/cpu/6502.h
@@ -99,7 +99,9 @@ typedef union videoMode_u {
         uint8_t altChr : 1;     // 0: normal   1: alternate character set
         uint8_t mixed : 1;      // 0: no mix   1: mixed graphics and text when in graphics mode
         uint8_t hires : 1;      // 0: loRes    1: hiRes
-        uint8_t page : 1;       // 0: page 1   1: page 2 (aux video memory)
+        uint8_t page2 : 1;       // 0: page 1   1: page 2 (aux video memory)
+        uint8_t intCxROM : 1;   // 0: Slot Cx ROM   1: Internal Cx ROM
+        uint8_t slotC3ROM : 1;  // 0: Internal ROM  1: Slot 3 ROM
     };
     uint8_t mode;
 } videoMode_t;
@@ -109,6 +111,7 @@ extern videoMode_t videoMode;
 
 extern m6502_t m6502;
 extern uint8_t * RAM;
+extern uint8_t * AUX_VID_RAM;
 extern uint32_t * videoMemPtr;
 
 extern void hires_Update(void);
diff --git a/src/cpu/instructions/6502_instr_load_store.h b/src/cpu/instructions/6502_instr_load_store.h
index 2b57264..53acbbc 100644
--- a/src/cpu/instructions/6502_instr_load_store.h
+++ b/src/cpu/instructions/6502_instr_load_store.h
@@ -118,6 +118,20 @@ INLINE void STR( uint8_t * dst, uint8_t src ) {
             return;
         }
     }
+//    else if ( ( addr >= 0x400 ) && ( addr < 0x800 ) ) {
+//        // Peripheral-card scratchpad RAM locations should be available on both memory
+//        if ( ( ( addr >= 0x478 ) && ( addr <= 0x47F ) )
+//          || ( ( addr >= 0x4F8 ) && ( addr <= 0x4FF ) )
+//          || ( ( addr >= 0x578 ) && ( addr <= 0x57F ) )
+//          || ( ( addr >= 0x5F8 ) && ( addr <= 0x5FF ) )
+//          || ( ( addr >= 0x678 ) && ( addr <= 0x67F ) )
+//          || ( ( addr >= 0x6F8 ) && ( addr <= 0x6FF ) )
+//          || ( ( addr >= 0x778 ) && ( addr <= 0x77F ) )
+//          || ( ( addr >= 0x7F8 ) && ( addr <= 0x7FF ) )
+//        ) {
+//            AUX_VID_RAM[ addr - 0x400 ] = src;
+//        }
+//    }
     
     *dst = src;
 
diff --git a/src/dev/mem/mmio.h b/src/dev/mem/mmio.h
index 0204ddc..ef9cc36 100644
--- a/src/dev/mem/mmio.h
+++ b/src/dev/mem/mmio.h
@@ -30,10 +30,13 @@ videoMode_t videoMode = { 1 }; // 40 col text, page 1
 uint8_t Apple2_Dummy_Page[ 1 * PG ];        // Dummy Page for discarding data
 uint8_t Apple2_Dummy_RAM[ 4 * KB ];         // Dummy RAM for discarding data
 uint8_t Apple2_512_AUX[  2 * PG ] = {0};    // Auxiliary bank for page 0 and 1
+uint8_t Apple2_VID_AUX[  2 * KB ] = {0};    // Auxiliary RAM for video page 2
 uint8_t Apple2_12K_ROM[ 12 * KB ] = {0};    // ROM D0, D8, E0, E8, F0, F8
 uint8_t Apple2_16K_ROM[ 16 * KB ] = {0};    // ROM C0, C8, D0, D8, E0, E8, F0, F8
 uint8_t Apple2_16K_RAM[ 16 * KB ] = {0};    // 16K Memory Expansion Card
 uint8_t Apple2_64K_RAM[ 64 * KB ] = {0};    // Main Memory
+
+uint8_t * AUX_VID_RAM = Apple2_VID_AUX;     // Pointer to Auxiliary Video Memory
 uint8_t * RAM = Apple2_64K_RAM;             // Pointer to the main memory so we can use this from Swift
 
 
@@ -58,6 +61,38 @@ uint8_t * RAM = Apple2_64K_RAM;             // Pointer to the main memory so we
     DEF_RAM_PAGE(mem, (pg) + 0x0E), \
     DEF_RAM_PAGE(mem, (pg) + 0x0F)
 
+
+#define SWITCH_VIDEO_RAM( tbl,tpg, mem,mpg ) \
+    (tbl)[ (tpg) + 0x00 ] = DEF_RAM_PAGE(mem, (mpg) + 0x00); \
+    (tbl)[ (tpg) + 0x01 ] = DEF_RAM_PAGE(mem, (mpg) + 0x01); \
+    (tbl)[ (tpg) + 0x02 ] = DEF_RAM_PAGE(mem, (mpg) + 0x02); \
+    (tbl)[ (tpg) + 0x03 ] = DEF_RAM_PAGE(mem, (mpg) + 0x03);
+//    (tbl)[ (tpg) + 0x04 ] = DEF_RAM_PAGE(mem, (mpg) + 0x04); \
+//    (tbl)[ (tpg) + 0x05 ] = DEF_RAM_PAGE(mem, (mpg) + 0x05); \
+//    (tbl)[ (tpg) + 0x06 ] = DEF_RAM_PAGE(mem, (mpg) + 0x06); \
+//    (tbl)[ (tpg) + 0x07 ] = DEF_RAM_PAGE(mem, (mpg) + 0x07);
+
+
+#define SWITCH_ROM_PAGE( tbl,tpg, mem,mpg ) \
+    (tbl)[ (tpg) ] = DEF_RAM_PAGE( mem, (mpg) );
+
+#define SWITCH_CX_ROM( tbl,tpg, mem,mpg ) \
+    (tbl)[ (tpg) + 0x01 ] = DEF_RAM_PAGE(mem, (mpg) + 0x01); \
+    (tbl)[ (tpg) + 0x02 ] = DEF_RAM_PAGE(mem, (mpg) + 0x02); \
+    (tbl)[ (tpg) + 0x03 ] = DEF_RAM_PAGE(mem, (mpg) + 0x03); \
+    (tbl)[ (tpg) + 0x04 ] = DEF_RAM_PAGE(mem, (mpg) + 0x04); \
+    (tbl)[ (tpg) + 0x05 ] = DEF_RAM_PAGE(mem, (mpg) + 0x05); \
+    (tbl)[ (tpg) + 0x06 ] = DEF_RAM_PAGE(mem, (mpg) + 0x06); \
+    (tbl)[ (tpg) + 0x07 ] = DEF_RAM_PAGE(mem, (mpg) + 0x07); \
+    (tbl)[ (tpg) + 0x08 ] = DEF_RAM_PAGE(mem, (mpg) + 0x08); \
+    (tbl)[ (tpg) + 0x09 ] = DEF_RAM_PAGE(mem, (mpg) + 0x09); \
+    (tbl)[ (tpg) + 0x0A ] = DEF_RAM_PAGE(mem, (mpg) + 0x0A); \
+    (tbl)[ (tpg) + 0x0B ] = DEF_RAM_PAGE(mem, (mpg) + 0x0B); \
+    (tbl)[ (tpg) + 0x0C ] = DEF_RAM_PAGE(mem, (mpg) + 0x0C); \
+    (tbl)[ (tpg) + 0x0D ] = DEF_RAM_PAGE(mem, (mpg) + 0x0D); \
+    (tbl)[ (tpg) + 0x0E ] = DEF_RAM_PAGE(mem, (mpg) + 0x0E); \
+    (tbl)[ (tpg) + 0x0F ] = DEF_RAM_PAGE(mem, (mpg) + 0x0F);
+
 #define SWITCH_RAM_PAGE16( tbl,tpg, mem,mpg ) \
     (tbl)[ (tpg) + 0x00 ] = DEF_RAM_PAGE(mem, (mpg) + 0x00); \
     (tbl)[ (tpg) + 0x01 ] = DEF_RAM_PAGE(mem, (mpg) + 0x01); \
@@ -150,7 +185,28 @@ uint8_t * RAM_PG_WR_TBL[256] = {
     DEF_RAM_PAGE16( Apple2_64K_RAM, 0xA0),
     DEF_RAM_PAGE16( Apple2_64K_RAM, 0xB0),
     // I/O Addresses
+//    DEF_RAM_DUMMY16,
+    
     DEF_RAM_PAGE16( Apple2_64K_RAM, 0xC0),
+
+//    DEF_RAM_PAGE(Apple2_64K_RAM, 0xC0),
+//    // SLOT ROM is non-writeable
+//    DEF_RAM_PAGE(Apple2_Dummy_Page, 0), // 01
+//    DEF_RAM_PAGE(Apple2_Dummy_Page, 0), // 02
+//    DEF_RAM_PAGE(Apple2_Dummy_Page, 0), // 03
+//    DEF_RAM_PAGE(Apple2_Dummy_Page, 0), // 04
+//    DEF_RAM_PAGE(Apple2_Dummy_Page, 0), // 05
+//    DEF_RAM_PAGE(Apple2_Dummy_Page, 0), // 06
+//    DEF_RAM_PAGE(Apple2_Dummy_Page, 0), // 07
+//    DEF_RAM_PAGE(Apple2_Dummy_Page, 0), // 08
+//    DEF_RAM_PAGE(Apple2_Dummy_Page, 0), // 09
+//    DEF_RAM_PAGE(Apple2_Dummy_Page, 0), // 0A
+//    DEF_RAM_PAGE(Apple2_Dummy_Page, 0), // 0B
+//    DEF_RAM_PAGE(Apple2_Dummy_Page, 0), // 0C
+//    DEF_RAM_PAGE(Apple2_Dummy_Page, 0), // 0D
+//    DEF_RAM_PAGE(Apple2_Dummy_Page, 0), // 0E
+//    DEF_RAM_PAGE(Apple2_Dummy_Page, 0), // 0F
+
     // NO Writing to the ROM
     DEF_RAM_DUMMY16,
     DEF_RAM_DUMMY16,
@@ -179,31 +235,45 @@ typedef struct MEMcfg_s {
     uint8_t WR_RAM      : 1;
     uint8_t RAM_BANK_2  : 1;
     uint8_t AUX_BANK    : 1;
+    uint8_t is80STORE  : 1;
 } MEMcfg_t;
 
-MEMcfg_t MEMcfg = { 1, 0, 0, 0, 0, 0 };
+MEMcfg_t MEMcfg = { 1, 0, 0, 0, 0, 0, 0 };
+
+// https://www.kreativekorp.com/miscpages/a2info/iomemory.shtml
+// Comp:  O = Apple II+  E = Apple IIe  C = Apple IIc  G = Apple IIgs
+// Act:   R = Read       W = Write      7 = Bit 7      V = Value
 
 enum mmio {
     // Keyboard
-    io_KBD              = 0xC000,
-    io_KBDSTRB          = 0xC010,
+    io_KBD              = 0xC000,   // OECG  R   Last Key Pressed + 128
+    io_KBDSTRB          = 0xC010,   // OECG WR   Keyboard Strobe
 
     // Audio
-    io_SPKR             = 0xC030,
+    io_SPKR             = 0xC030,   // OECG  R   Toggle Speaker
     
     // Video
-    io_VID_80col_OFF    = 0xC00C,
-    io_VID_80col_ON     = 0xC00D,
-    io_VID_AltChar_OFF  = 0xC00E,
-    io_VID_AltChar_ON   = 0xC00F,
+    io_80STOREOFF       = 0xC000,   //  ECG W    Use $C002-$C005 for Aux Memory
+    io_80STOREON        = 0xC001,   //  ECG W    Use PAGE2 for Aux Memory
+    io_RD80STORE        = 0xC018,   //  ECG  R7  Status of $C002-$C005/PAGE2 for Aux Mem
+    io_VID_CLR80VID     = 0xC00C,   //  ECG W    40 Columns
+    io_VID_SET80VID     = 0xC00D,   //  ECG W    80 Columns
+    io_VID_CLRALTCHAR   = 0xC00E,   //  ECG W    Primary Character Set
+    io_VID_SETALTCHAR   = 0xC00F,   //  ECG W    Alternate Character Set
+    io_VID_ALTCHAR      = 0xC01E,   //  ECG  R7  Status of Primary/Alternate Character Set
+    io_VID_RD80VID      = 0xC01F,   //  ECG  R7  Status of 40/80 Columns
     io_VID_Text_OFF     = 0xC050,
     io_VID_Text_ON      = 0xC051,
     io_VID_Mixed_OFF    = 0xC052,
     io_VID_Mixed_ON     = 0xC053,
-    io_VID_Page2_OFF    = 0xC054,
-    io_VID_Page2_ON     = 0xC055,
+    io_VID_TXTPAGE1     = 0xC054,   // OECG WR   Display Page 1
+    io_VID_TXTPAGE2     = 0xC055,   // OECG WR   If 80STORE Off: Display Page 2
+                                    //  ECG WR   If 80STORE On: Read/Write Aux Display Mem
     io_VID_Hires_OFF    = 0xC056,
     io_VID_Hires_ON     = 0xC057,
+    
+    io_TAPEIN           = 0xC060,   // OE    R7  Read Cassette Input
+                                    //   C   R7  Status of 80/40 Column Switch
 
     // Game Controller
     io_PDL0             = 0xC064,
@@ -231,6 +301,14 @@ enum mmio {
     io_DISK_SHIFT       = 0xC08F,
 
     // Memory
+    io_SETSLOTCXROM     = 0xC006,   //  E G W    Disable Internal ROM / Enable Peripheral ROM ($C100-$CFFF)
+    io_SETINTCXROM      = 0xC007,   //  E G W    Enable Internal ROM ($C100-$CFFF)
+    io_RDCXROM          = 0xC015,   //  E G  R7  Read state of $C100-$CFFF soft switch -- Status of Periph/ROM Access
+    io_RSTXINT          = 0xC015,   //   C   R   Reset Mouse X0 Interrupt
+    io_SETINTC3ROM      = 0xC00A,   //  E G W    ROM in Slot 3
+    io_SETSLOTC3ROM     = 0xC00B,   //  E G W    ROM in Aux Slot
+    io_RDC3ROM          = 0xC017,   //  E G  R7  Status of Slot 3/Aux Slot ROM
+    io_RSTYINT          = 0xC017,   //   C   R   Reset Mouse Y0 Interrupt
     io_MEM_RDRAM_NOWR_2 = 0xC080,
     io_MEM_RDROM_WRAM_2 = 0xC081,
     io_MEM_RDROM_NOWR_2 = 0xC082,
@@ -294,7 +372,10 @@ void resetMemory() {
     MEMcfg.WR_RAM       = 0;
     MEMcfg.RAM_BANK_2   = 0;
     MEMcfg.AUX_BANK     = 0;
+    MEMcfg.is80STORE    = 0;
 
+    // Aux Video Memory
+    memset( Apple2_VID_AUX, 0xFF | 0x80, sizeof(Apple2_VID_AUX) );
     // 64K Main Memory Area
     memset( RAM, 0, sizeof(Apple2_64K_RAM) );
     // 16K Memory Expansion
@@ -329,20 +410,48 @@ INLINE uint8_t ioRead( uint16_t addr ) {
             
             return RAM[io_SPKR];
 
-        case io_VID_80col_OFF:
-            videoMode.col80 = 0;
+//        case io_VID_CLR80VID:
+//            videoMode.col80 = 0;
+//            break;
+//
+//        case io_VID_SET80VID:
+//            videoMode.col80 = 1;
+//            break;
+//
+        case io_VID_ALTCHAR:
+            return videoMode.altChr << 7;
+            
+        case io_VID_RD80VID:
+            return videoMode.col80 << 7;
+            
+        case io_TAPEIN:
+            return videoMode.page2 << 7;
+            
+        case io_RDCXROM:
+            return videoMode.intCxROM << 7;
+            
+        case io_RDC3ROM:
+            return videoMode.slotC3ROM << 7;
+            
+        case io_RD80STORE:
+            return MEMcfg.is80STORE << 7;
+            
+        case io_VID_TXTPAGE1:
+//            printf("io_VID_TXTPAGE1\n");
+            videoMode.page2 = 0;
+            if ( MEMcfg.is80STORE ) {
+                SWITCH_VIDEO_RAM( RAM_PG_RD_TBL, 0x04, Apple2_64K_RAM, 0x04)
+                SWITCH_VIDEO_RAM( RAM_PG_WR_TBL, 0x04, Apple2_64K_RAM, 0x04)
+            }
             break;
             
-        case io_VID_80col_ON:
-            videoMode.col80 = 1;
-            break;
-            
-        case io_VID_AltChar_OFF:
-            videoMode.altChr = 0;
-            break;
-            
-        case io_VID_AltChar_ON:
-            videoMode.altChr = 1;
+        case io_VID_TXTPAGE2:
+//            printf("io_VID_TXTPAGE2\n");
+            videoMode.page2 = 1;
+            if ( MEMcfg.is80STORE ) {
+                SWITCH_VIDEO_RAM( RAM_PG_RD_TBL, 0x04, Apple2_VID_AUX, 0x00)
+                SWITCH_VIDEO_RAM( RAM_PG_WR_TBL, 0x04, Apple2_VID_AUX, 0x00)
+            }
             break;
             
         case io_VID_Text_OFF:
@@ -361,14 +470,6 @@ INLINE uint8_t ioRead( uint16_t addr ) {
             videoMode.mixed = 1;
             break;
             
-        case io_VID_Page2_OFF:
-            videoMode.page = 0;
-            break;
-            
-        case io_VID_Page2_ON:
-            videoMode.page = 1;
-            break;
-            
         case io_VID_Hires_OFF:
             videoMode.hires = 0;
             break;
@@ -559,15 +660,97 @@ void kbdInput ( uint8_t code ) {
 
 
 INLINE void ioWrite( uint16_t addr, uint8_t val ) {
-    //    printf("mmio:%04X\n", addr);
+    // printf("ioWrite:%04X (A:%02X)\n", addr, m6502.A);
     switch (addr) {
-        case io_KBD:
-            break;
-            
         case io_KBDSTRB:
             RAM[io_KBD] &= 0x7F;
             break;
+            
+        case io_SETSLOTCXROM:
+//            printf("io_SETSLOTCXROM\n");
+            videoMode.intCxROM = 0;
+//            SWITCH_RAM_PAGE16( RAM_PG_RD_TBL, 0xC0, Apple2_64K_RAM, 0xC0);
+            SWITCH_CX_ROM( RAM_PG_RD_TBL, 0xC0, Apple2_64K_RAM, 0xC0);
+//            RAM_PG_RD_TBL[ 0xC0 ] = DEF_RAM_PAGE(Apple2_64K_RAM, 0xC0);
+            break;
 
+        case io_SETINTCXROM:
+//            printf("io_SETINTCXROM\n");
+            videoMode.intCxROM = 1;
+//            SWITCH_RAM_PAGE16( RAM_PG_RD_TBL, 0xC0, Apple2_16K_ROM, 0x00);
+            SWITCH_CX_ROM( RAM_PG_RD_TBL, 0xC0, Apple2_16K_ROM, 0x00);
+//            RAM_PG_RD_TBL[ 0xC0 ] = DEF_RAM_PAGE(Apple2_16K_ROM, 0x00);
+            break;
+
+        case io_SETSLOTC3ROM:
+//            printf("io_SETSLOTC3ROM\n");
+            videoMode.slotC3ROM = 1;
+            SWITCH_ROM_PAGE( RAM_PG_RD_TBL, 0xC3, Apple2_64K_RAM, 0xC3);
+//            RAM_PG_RD_TBL[ 0xC3 ] = DEF_RAM_PAGE(Apple2_64K_RAM, 0xC3);
+            break;
+
+        case io_SETINTC3ROM:
+//            printf("io_SETINTC3ROM\n");
+            videoMode.slotC3ROM = 0;
+            SWITCH_ROM_PAGE( RAM_PG_RD_TBL, 0xC3, Apple2_16K_ROM, 0x03);
+//            RAM_PG_RD_TBL[ 0xC3 ] = DEF_RAM_PAGE(Apple2_16K_ROM, 0x03);
+            break;
+
+        case io_VID_CLR80VID:
+//            printf("io_VID_CLR80VID\n");
+            videoMode.col80 = 0;
+            break;
+            
+        case io_VID_SET80VID:
+            videoMode.col80 = 1;
+            break;
+            
+        case io_VID_CLRALTCHAR:
+            videoMode.altChr = 0;
+            break;
+            
+        case io_VID_SETALTCHAR:
+            videoMode.altChr = 1;
+            break;
+            
+        case io_80STOREOFF:
+//            printf("io_80STOREOFF\n");
+            MEMcfg.is80STORE = 0;
+            SWITCH_VIDEO_RAM( RAM_PG_RD_TBL, 0x04, Apple2_64K_RAM, 0x04)
+            SWITCH_VIDEO_RAM( RAM_PG_WR_TBL, 0x04, Apple2_64K_RAM, 0x04)
+            break;
+            
+        case io_80STOREON:
+//            printf("io_80STOREON\n");
+            MEMcfg.is80STORE = 1;
+            if ( videoMode.page2 ) {
+                SWITCH_VIDEO_RAM( RAM_PG_RD_TBL, 0x04, Apple2_VID_AUX, 0x00)
+                SWITCH_VIDEO_RAM( RAM_PG_WR_TBL, 0x04, Apple2_VID_AUX, 0x00)
+            }
+            else {
+                SWITCH_VIDEO_RAM( RAM_PG_RD_TBL, 0x04, Apple2_64K_RAM, 0x04)
+                SWITCH_VIDEO_RAM( RAM_PG_WR_TBL, 0x04, Apple2_64K_RAM, 0x04)
+            }
+            break;
+            
+        case io_VID_TXTPAGE1:
+//            printf("io_VID_TXTPAGE1\n");
+            videoMode.page2 = 0;
+            if ( MEMcfg.is80STORE ) {
+                SWITCH_VIDEO_RAM( RAM_PG_RD_TBL, 0x04, Apple2_64K_RAM, 0x04)
+                SWITCH_VIDEO_RAM( RAM_PG_WR_TBL, 0x04, Apple2_64K_RAM, 0x04)
+            }
+            break;
+            
+        case io_VID_TXTPAGE2:
+//            printf("io_VID_TXTPAGE2\n");
+            videoMode.page2 = 1;
+            if ( MEMcfg.is80STORE ) {
+                SWITCH_VIDEO_RAM( RAM_PG_RD_TBL, 0x04, Apple2_VID_AUX, 0x00)
+                SWITCH_VIDEO_RAM( RAM_PG_WR_TBL, 0x04, Apple2_VID_AUX, 0x00)
+            }
+            break;
+            
         default:
             break;
     }