diff --git a/A2Mac.xcodeproj/project.pbxproj b/A2Mac.xcodeproj/project.pbxproj
index bfeda85..281dabc 100644
--- a/A2Mac.xcodeproj/project.pbxproj
+++ b/A2Mac.xcodeproj/project.pbxproj
@@ -11,7 +11,7 @@
 		320B3FC424AD88B0005EA133 /* power.png in Copy Image Files */ = {isa = PBXBuildFile; fileRef = 320B3FC324AD88B0005EA133 /* power.png */; };
 		320B4FC124B182DE00070038 /* Apple Disk II.png in Copy Image Files */ = {isa = PBXBuildFile; fileRef = 320B4FC024B182DD00070038 /* Apple Disk II.png */; };
 		320F2A8824CFD74100671B35 /* Steve2Icon.icns in Resources */ = {isa = PBXBuildFile; fileRef = 320F2A8724CFD74000671B35 /* Steve2Icon.icns */; };
-		320F2A8D24D0FB9200671B35 /* 6502.c in Sources */ = {isa = PBXBuildFile; fileRef = 32439F7422ECD8AD0077AAE0 /* 6502.c */; };
+		320F2AAD24D53B4100671B35 /* 6502.c in Sources */ = {isa = PBXBuildFile; fileRef = 32439F7422ECD8AD0077AAE0 /* 6502.c */; };
 		3213936624079C30007F5C4A /* Main.storyboard in Resources */ = {isa = PBXBuildFile; fileRef = 32BFFB6022EACC660003B53F /* Main.storyboard */; };
 		323D042E248980600086A901 /* Preferences.storyboard in Resources */ = {isa = PBXBuildFile; fileRef = 323D042D248980600086A901 /* Preferences.storyboard */; };
 		323D043024898AB70086A901 /* PreferencesViewController.swift in Sources */ = {isa = PBXBuildFile; fileRef = 323D042F24898AB70086A901 /* PreferencesViewController.swift */; };
@@ -313,6 +313,7 @@
 		320F2A8924CFFBE300671B35 /* 6502_std.h */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.h; path = 6502_std.h; sourceTree = "<group>"; };
 		320F2A8A24D0001600671B35 /* 6502_und.h */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.h; path = 6502_und.h; sourceTree = "<group>"; };
 		320F2A8B24D0828600671B35 /* 6502_C.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; path = 6502_C.h; sourceTree = "<group>"; };
+		320F2A9924D4DE8400671B35 /* 6502_C_Rockwell.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; path = 6502_C_Rockwell.h; sourceTree = "<group>"; };
 		323D042D248980600086A901 /* Preferences.storyboard */ = {isa = PBXFileReference; lastKnownFileType = file.storyboard; path = Preferences.storyboard; sourceTree = "<group>"; };
 		323D042F24898AB70086A901 /* PreferencesViewController.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = PreferencesViewController.swift; sourceTree = "<group>"; };
 		323D04312489BFD80086A901 /* PreferencesWindowController.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = PreferencesWindowController.swift; sourceTree = "<group>"; };
@@ -681,6 +682,7 @@
 				320F2A8924CFFBE300671B35 /* 6502_std.h */,
 				320F2A8A24D0001600671B35 /* 6502_und.h */,
 				320F2A8B24D0828600671B35 /* 6502_C.h */,
+				320F2A9924D4DE8400671B35 /* 6502_C_Rockwell.h */,
 				32440B69247CA1CE000F9DA1 /* 65C02.c */,
 				32440B67247CA1AF000F9DA1 /* 6502_vanilla.c */,
 			);
@@ -1206,11 +1208,11 @@
 			isa = PBXSourcesBuildPhase;
 			buildActionMask = 2147483647;
 			files = (
+				320F2AAD24D53B4100671B35 /* 6502.c in Sources */,
 				32BFFB5B22EACC630003B53F /* AppDelegate.swift in Sources */,
 				32E3126D24AC033A00E61891 /* ToolBarController.swift in Sources */,
 				323D043024898AB70086A901 /* PreferencesViewController.swift in Sources */,
 				323D04332489BFD80086A901 /* PreferencesWindowController.swift in Sources */,
-				320F2A8D24D0FB9200671B35 /* 6502.c in Sources */,
 				32E3126924A98B9300E61891 /* dsk2woz.c in Sources */,
 				325EB63623F8F78300C6B4A4 /* disk.c in Sources */,
 				325EB62F23F8856F00C6B4A4 /* woz.c in Sources */,
diff --git a/A2Mac.xcodeproj/project.xcworkspace/xcuserdata/trudnai.xcuserdatad/xcdebugger/Expressions.xcexplist b/A2Mac.xcodeproj/project.xcworkspace/xcuserdata/trudnai.xcuserdatad/xcdebugger/Expressions.xcexplist
index 4657d5b..73d371a 100644
--- a/A2Mac.xcodeproj/project.xcworkspace/xcuserdata/trudnai.xcuserdatad/xcdebugger/Expressions.xcexplist
+++ b/A2Mac.xcodeproj/project.xcworkspace/xcuserdata/trudnai.xcuserdatad/xcdebugger/Expressions.xcexplist
@@ -14,13 +14,10 @@
          </PersistentStrings>
       </ContextState>
       <ContextState
-         contextName = "BRA:6502_instr_branch.h">
+         contextName = "specialized closure #1 in ViewController.Update():ViewController.swift">
          <PersistentStrings>
             <PersistentString
-               value = "">
-            </PersistentString>
-            <PersistentString
-               value = "RAM[0x346f]">
+               value = "self.HiRes.frame">
             </PersistentString>
          </PersistentStrings>
       </ContextState>
@@ -67,7 +64,7 @@
          contextName = "closure #1 in ViewController.Update():ViewController.swift">
          <PersistentStrings>
             <PersistentString
-               value = "MEMcfg.is_80STORE">
+               value = "txtArr">
             </PersistentString>
             <PersistentString
                value = "self.shadowTxt">
@@ -76,10 +73,10 @@
                value = "txt">
             </PersistentString>
             <PersistentString
-               value = "MEMcfg.txt_page_2">
+               value = "MEMcfg.is_80STORE">
             </PersistentString>
             <PersistentString
-               value = "txtArr">
+               value = "MEMcfg.txt_page_2">
             </PersistentString>
          </PersistentStrings>
       </ContextState>
@@ -220,27 +217,27 @@
       <ContextState
          contextName = "spkr_update:speaker.c">
          <PersistentStrings>
-            <PersistentString
-               value = "(uint8_t)spkr_samples[452]">
-            </PersistentString>
             <PersistentString
                value = "clk_6502_per_frm_max">
             </PersistentString>
             <PersistentString
-               value = "clkfrm">
-            </PersistentString>
-            <PersistentString
-               value = "(uint8_t)spkr_samples[451]">
+               value = "(uint8_t)spkr_samples[452]">
             </PersistentString>
             <PersistentString
                value = "spkr_sample_idx">
             </PersistentString>
             <PersistentString
-               value = "(uint8_t)spkr_samples[455]">
+               value = "(uint8_t)spkr_samples[451]">
             </PersistentString>
             <PersistentString
                value = "clk_6502_per_frm">
             </PersistentString>
+            <PersistentString
+               value = "(uint8_t)spkr_samples[455]">
+            </PersistentString>
+            <PersistentString
+               value = "clkfrm">
+            </PersistentString>
          </PersistentStrings>
       </ContextState>
       <ContextState
@@ -295,7 +292,7 @@
                value = "pdl_value[pdl]">
             </PersistentString>
             <PersistentString
-               value = "normalized_time">
+               value = "normalized_time &gt;= pdl_value[pdl] ? 255 : 0">
             </PersistentString>
             <PersistentString
                value = "(3300 * 255/3300)">
@@ -307,7 +304,7 @@
                value = "1 * 512 * (1  - ( 3300 / 3300.0  ))">
             </PersistentString>
             <PersistentString
-               value = "normalized_time &gt;= pdl_value[pdl] ? 255 : 0">
+               value = "normalized_time">
             </PersistentString>
          </PersistentStrings>
       </ContextState>
@@ -324,13 +321,13 @@
                value = "textLines">
             </PersistentString>
             <PersistentString
-               value = "hires.frame">
+               value = "hires.layer">
             </PersistentString>
             <PersistentString
                value = "view">
             </PersistentString>
             <PersistentString
-               value = "hires.layer">
+               value = "hires.frame">
             </PersistentString>
          </PersistentStrings>
       </ContextState>
@@ -346,7 +343,7 @@
          contextName = "LoRes.Update():LoRes.swift">
          <PersistentStrings>
             <PersistentString
-               value = "UInt8( (block &gt;&gt; 4) &amp; 0x0F )">
+               value = "blockChanged[ screenIdx ]">
             </PersistentString>
             <PersistentString
                value = "UInt8(block)">
@@ -355,7 +352,7 @@
                value = "UInt8(block &amp; 4)">
             </PersistentString>
             <PersistentString
-               value = "blockChanged[ screenIdx ]">
+               value = "UInt8( (block &gt;&gt; 4) &amp; 0x0F )">
             </PersistentString>
          </PersistentStrings>
       </ContextState>
@@ -390,10 +387,10 @@
          contextName = "set_flags_NZC:common.h">
          <PersistentStrings>
             <PersistentString
-               value = "(unsigned)0xFF">
+               value = "(unsigned)test ">
             </PersistentString>
             <PersistentString
-               value = "(unsigned)test ">
+               value = "(unsigned)0xFF">
             </PersistentString>
          </PersistentStrings>
       </ContextState>
@@ -543,10 +540,10 @@
          contextName = "HiRes.draw(_:):HiRes.swift">
          <PersistentStrings>
             <PersistentString
-               value = "ctx?.bitsPerComponent">
+               value = "linAddr">
             </PersistentString>
             <PersistentString
-               value = "ctx?.data">
+               value = "ctx?.height">
             </PersistentString>
             <PersistentString
                value = "ctx?.width">
@@ -569,14 +566,14 @@
             <PersistentString
                value = "HiRes.blockCols">
             </PersistentString>
+            <PersistentString
+               value = "ctx?.bitsPerComponent">
+            </PersistentString>
             <PersistentString
                value = "shadowScreen">
             </PersistentString>
             <PersistentString
-               value = "linAddr">
-            </PersistentString>
-            <PersistentString
-               value = "ctx?.height">
+               value = "ctx?.data">
             </PersistentString>
          </PersistentStrings>
       </ContextState>
@@ -592,13 +589,13 @@
          contextName = "HiRes.compute():HiRes.swift">
          <PersistentStrings>
             <PersistentString
-               value = "UnsafeRawBufferPointer(result)">
+               value = "computePipelineState.maxTotalThreadsPerThreadgroup">
             </PersistentString>
             <PersistentString
                value = "result[2]">
             </PersistentString>
             <PersistentString
-               value = "computePipelineState.maxTotalThreadsPerThreadgroup">
+               value = "UnsafeRawBufferPointer(result)">
             </PersistentString>
          </PersistentStrings>
       </ContextState>
@@ -640,6 +637,9 @@
             <PersistentString
                value = "m6502">
             </PersistentString>
+            <PersistentString
+               value = "(void*)Apple2_64K_RAM">
+            </PersistentString>
             <PersistentString
                value = "Apple2_64K_AUX + 0x3600">
             </PersistentString>
@@ -649,9 +649,6 @@
             <PersistentString
                value = "Apple2_64K_RAM + 0x3600">
             </PersistentString>
-            <PersistentString
-               value = "(void*)Apple2_64K_RAM">
-            </PersistentString>
          </PersistentStrings>
       </ContextState>
       <ContextState
@@ -706,7 +703,7 @@
                value = "new">
             </PersistentString>
             <PersistentString
-               value = "WOZtmp.shift16">
+               value = "WOZwrite.shift16">
             </PersistentString>
             <PersistentString
                value = "WOZwrite.shift">
@@ -718,7 +715,21 @@
                value = "(1 &lt;&lt; i) - 1">
             </PersistentString>
             <PersistentString
-               value = "WOZwrite.shift16">
+               value = "WOZtmp.shift16">
+            </PersistentString>
+         </PersistentStrings>
+      </ContextState>
+      <ContextState
+         contextName = "io_RAM_EXP:mmio.h">
+         <PersistentStrings>
+            <PersistentString
+               value = "m6502.clktime + clkfrm">
+            </PersistentString>
+            <PersistentString
+               value = "m6502.clktime + clkfrm - wram1_clk">
+            </PersistentString>
+            <PersistentString
+               value = "wram1_clk">
             </PersistentString>
          </PersistentStrings>
       </ContextState>
@@ -740,10 +751,10 @@
                value = "Apple2_64K_AUX + 0xC600">
             </PersistentString>
             <PersistentString
-               value = "Apple2_64K_RAM + 0xC600">
+               value = "(void*)rom">
             </PersistentString>
             <PersistentString
-               value = "(void*)rom">
+               value = "Apple2_64K_RAM + 0xC600">
             </PersistentString>
             <PersistentString
                value = "strlen(fullPath)">
@@ -768,10 +779,13 @@
          </PersistentStrings>
       </ContextState>
       <ContextState
-         contextName = "specialized closure #1 in ViewController.Update():ViewController.swift">
+         contextName = "BRA:6502_instr_branch.h">
          <PersistentStrings>
             <PersistentString
-               value = "self.HiRes.frame">
+               value = "">
+            </PersistentString>
+            <PersistentString
+               value = "RAM[0x346f]">
             </PersistentString>
          </PersistentStrings>
       </ContextState>
diff --git a/A2Mac/Base.lproj/Main.storyboard b/A2Mac/Base.lproj/Main.storyboard
index dfc9eb0..6da4379 100644
--- a/A2Mac/Base.lproj/Main.storyboard
+++ b/A2Mac/Base.lproj/Main.storyboard
@@ -1317,7 +1317,7 @@
                                     <popUpButton key="view" id="Ktw-L6-kEz">
                                         <rect key="frame" x="0.0" y="14" width="43" height="30"/>
                                         <autoresizingMask key="autoresizingMask" flexibleMaxX="YES" flexibleMinY="YES"/>
-                                        <popUpButtonCell key="cell" type="bevel" bezelStyle="regularSquare" image="Joystick" imagePosition="only" alignment="right" lineBreakMode="truncatingTail" refusesFirstResponder="YES" imageScaling="proportionallyUpOrDown" inset="2" pullsDown="YES" arrowPosition="noArrow" id="A4p-LJ-svz">
+                                        <popUpButtonCell key="cell" type="bevel" bezelStyle="regularSquare" image="popUpButtonCell:A4p-LJ-svz:image" imagePosition="only" alignment="right" lineBreakMode="truncatingTail" refusesFirstResponder="YES" imageScaling="proportionallyUpOrDown" inset="2" pullsDown="YES" arrowPosition="noArrow" id="A4p-LJ-svz">
                                             <behavior key="behavior" pushIn="YES" lightByBackground="YES" lightByGray="YES"/>
                                             <font key="font" metaFont="menu"/>
                                             <menu key="menu" id="q8R-kX-3jc">
@@ -1343,7 +1343,7 @@
                                     <popUpButton key="view" id="rfS-6q-EKe">
                                         <rect key="frame" x="0.0" y="14" width="43" height="30"/>
                                         <autoresizingMask key="autoresizingMask" flexibleMaxX="YES" flexibleMinY="YES"/>
-                                        <popUpButtonCell key="cell" type="bevel" bezelStyle="regularSquare" image="Quick Disk" imagePosition="only" alignment="right" lineBreakMode="truncatingTail" refusesFirstResponder="YES" imageScaling="proportionallyUpOrDown" inset="2" pullsDown="YES" arrowPosition="noArrow" id="8bV-Aa-zHf">
+                                        <popUpButtonCell key="cell" type="bevel" bezelStyle="regularSquare" image="popUpButtonCell:A4p-LJ-svz:image" imagePosition="only" alignment="right" lineBreakMode="truncatingTail" refusesFirstResponder="YES" imageScaling="proportionallyUpOrDown" inset="2" pullsDown="YES" arrowPosition="noArrow" id="8bV-Aa-zHf">
                                             <behavior key="behavior" pushIn="YES" lightByBackground="YES" lightByGray="YES"/>
                                             <font key="font" metaFont="menu"/>
                                             <menu key="menu" id="7Vp-Rc-UbT">
@@ -1366,7 +1366,7 @@
                                     <popUpButton key="view" id="MAv-S5-diZ">
                                         <rect key="frame" x="0.0" y="14" width="43" height="30"/>
                                         <autoresizingMask key="autoresizingMask" flexibleMaxX="YES" flexibleMinY="YES"/>
-                                        <popUpButtonCell key="cell" type="bevel" bezelStyle="regularSquare" image="Chip" imagePosition="only" alignment="right" lineBreakMode="truncatingTail" refusesFirstResponder="YES" imageScaling="proportionallyUpOrDown" inset="2" pullsDown="YES" arrowPosition="noArrow" id="WVW-Wo-mc9">
+                                        <popUpButtonCell key="cell" type="bevel" bezelStyle="regularSquare" image="popUpButtonCell:A4p-LJ-svz:image" imagePosition="only" alignment="right" lineBreakMode="truncatingTail" refusesFirstResponder="YES" imageScaling="proportionallyUpOrDown" inset="2" pullsDown="YES" arrowPosition="noArrow" id="WVW-Wo-mc9">
                                             <behavior key="behavior" pushIn="YES" lightByBackground="YES" lightByGray="YES"/>
                                             <font key="font" metaFont="menu"/>
                                             <menu key="menu" id="Gc4-Or-LMB">
@@ -1611,7 +1611,66 @@
                                     </allowedInputSourceLocales>
                                 </textFieldCell>
                             </textField>
-                            <textField identifier="DisplayField" canDrawConcurrently="YES" focusRingType="none" verticalHuggingPriority="750" horizontalCompressionResistancePriority="250" alphaValue="0.0" mirrorLayoutDirectionWhenInternationalizing="never" textCompletion="NO" translatesAutoresizingMaskIntoConstraints="NO" id="SEL-hl-0c0">
+                            <scrollView hidden="YES" canDrawConcurrently="YES" borderType="none" horizontalLineScroll="4" horizontalPageScroll="24" verticalLineScroll="1" verticalPageScroll="24" hasHorizontalScroller="NO" hasVerticalScroller="NO" translatesAutoresizingMaskIntoConstraints="NO" id="ss1-M1-nGn" userLabel="Scroll View - Display View">
+                                <rect key="frame" x="11" y="16" width="1130" height="768"/>
+                                <clipView key="contentView" drawsBackground="NO" copiesOnScroll="NO" id="1wa-ZE-lex">
+                                    <rect key="frame" x="0.0" y="0.0" width="1130" height="768"/>
+                                    <autoresizingMask key="autoresizingMask" widthSizable="YES" heightSizable="YES"/>
+                                    <subviews>
+                                        <textView canDrawConcurrently="YES" editable="NO" drawsBackground="NO" importsGraphics="NO" richText="NO" horizontallyResizable="YES" verticallyResizable="YES" baseWritingDirection="leftToRight" findStyle="bar" allowsCharacterPickerTouchBarItem="NO" textCompletion="NO" id="ccC-Wu-3za" userLabel="Display">
+                                            <rect key="frame" x="0.0" y="0.0" width="1130" height="768"/>
+                                            <autoresizingMask key="autoresizingMask" widthSizable="YES" heightSizable="YES"/>
+                                            <color key="textColor" name="labelColor" catalog="System" colorSpace="catalog"/>
+                                            <color key="backgroundColor" name="textBackgroundColor" catalog="System" colorSpace="catalog"/>
+                                            <size key="minSize" width="1130" height="768"/>
+                                            <size key="maxSize" width="1152" height="10000000"/>
+                                            <attributedString key="textStorage">
+                                                <fragment>
+                                                    <mutableString key="content">1234567890123456789012345678901234567890@@@@@@@@@1@@@@@@@@@2@@@@@@@@@3@@@@@@@@@4
+@@@@@@@@@@@@@@@@@@@3@@@@@@@@@@@@@@@@@@@@
+@@@@@@@@@@@@@@@@@@@4@@@@@@@@@@@@@@@@@@@@
+@@@@@@@@@@@@@@@@@@@5@@@@@@@@@@@@@@@@@@@@
+@@@@@@@@@@@@@@@@@@@6@@@@@@@@@@@@@@@@@@@@
+@@@@@@@@@@@@@@@@@@@7@@@@@@@@@@@@@@@@@@@@
+@@@@@@@@@@@@@@@@@@@8@@@@@@@@@@@@@@@@@@@@
+@@@@@@@@@@@@@@@@@@@9@@@@@@@@@@@@@@@@@@@@
+@@@@@@@@@@@@@@@@@@10@@@@@@@@@@@@@@@@@@@@
+@@@@@@@@@@@@@@@@@@11@@@@@@@@@@@@@@@@@@@@
+@@@@@@@@@@@@@@@@@@12@@@@@@@@@@@@@@@@@@@@
+@@@@@@@@@@@@@@@@@@13@@@@@@@@@@@@@@@@@@@@
+@@@@@@@@@@@@@@@@@@14@@@@@@@@@@@@@@@@@@@@
+@@@@@@@@@@@@@@@@@@15@@@@@@@@@@@@@@@@@@@@
+@@@@@@@@@@@@@@@@@@16@@@@@@@@@@@@@@@@@@@@
+@@@@@@@@@@@@@@@@@@17@@@@@@@@@@@@@@@@@@@@
+@@@@@@@@@@@@@@@@@@18@@@@@@@@@@@@@@@@@@@@
+@@@@@@@@@@@@@@@@@@19@@@@@@@@@@@@@@@@@@@@
+@@@@@@@@@@@@@@@@@@20@@@@@@@@@@@@@@@@@@@@
+@@@@@@@@@@@@@@@@@@21@@@@@@@@@@@@@@@@@@@@
+@@@@@@@@@@@@@@@@@@22@@@@@@@@@@@@@@@@@@@@
+@@@@@@@@@@@@@@@@@@23@@@@@@@@@@@@@@@@@@@@
+@@@@@@@@@@@@@@@@@@24@@@@@@@@@@@@@@@@@@@@</mutableString>
+                                                    <attributes>
+                                                        <color key="NSColor" name="labelColor" catalog="System" colorSpace="catalog"/>
+                                                        <font key="NSFont" size="32" name="PrintChar21"/>
+                                                        <paragraphStyle key="NSParagraphStyle" alignment="natural" lineBreakMode="wordWrapping" baseWritingDirection="leftToRight" tighteningFactorForTruncation="0.0"/>
+                                                    </attributes>
+                                                </fragment>
+                                            </attributedString>
+                                            <color key="insertionPointColor" name="textColor" catalog="System" colorSpace="catalog"/>
+                                        </textView>
+                                    </subviews>
+                                    <edgeInsets key="contentInsets" left="0.0" right="0.0" top="0.0" bottom="0.0"/>
+                                </clipView>
+                                <scroller key="horizontalScroller" hidden="YES" verticalHuggingPriority="750" horizontal="YES" id="nV1-lT-ewY">
+                                    <rect key="frame" x="-100" y="-100" width="225" height="15"/>
+                                    <autoresizingMask key="autoresizingMask"/>
+                                </scroller>
+                                <scroller key="verticalScroller" hidden="YES" verticalHuggingPriority="750" horizontal="NO" id="cfR-PX-LW3">
+                                    <rect key="frame" x="-100" y="-100" width="15" height="135"/>
+                                    <autoresizingMask key="autoresizingMask"/>
+                                </scroller>
+                            </scrollView>
+                            <textField identifier="DisplayField" hidden="YES" canDrawConcurrently="YES" focusRingType="none" verticalHuggingPriority="750" horizontalCompressionResistancePriority="250" alphaValue="0.0" mirrorLayoutDirectionWhenInternationalizing="never" textCompletion="NO" translatesAutoresizingMaskIntoConstraints="NO" id="SEL-hl-0c0">
                                 <rect key="frame" x="14" y="16" width="1124" height="768"/>
                                 <constraints>
                                     <constraint firstAttribute="width" secondItem="SEL-hl-0c0" secondAttribute="height" multiplier="35:24" id="4LP-hK-Xit"/>
@@ -1745,7 +1804,7 @@
                                         <subviews>
                                             <popUpButton translatesAutoresizingMaskIntoConstraints="NO" id="49f-8R-QCc">
                                                 <rect key="frame" x="0.0" y="83" width="120" height="103"/>
-                                                <popUpButtonCell key="cell" type="bevel" bezelStyle="regularSquare" image="popUpButtonCell:CNs-lh-urM:image" imagePosition="only" alignment="left" lineBreakMode="truncatingTail" refusesFirstResponder="YES" imageScaling="proportionallyUpOrDown" inset="2" pullsDown="YES" arrowPosition="noArrow" altersStateOfSelectedItem="NO" id="CNs-lh-urM">
+                                                <popUpButtonCell key="cell" type="bevel" bezelStyle="regularSquare" image="popUpButtonCell:A4p-LJ-svz:image" imagePosition="only" alignment="left" lineBreakMode="truncatingTail" refusesFirstResponder="YES" imageScaling="proportionallyUpOrDown" inset="2" pullsDown="YES" arrowPosition="noArrow" altersStateOfSelectedItem="NO" id="CNs-lh-urM">
                                                     <behavior key="behavior" pushIn="YES" lightByBackground="YES" lightByGray="YES"/>
                                                     <font key="font" metaFont="menu"/>
                                                     <menu key="menu" id="N33-K0-nba">
@@ -1779,7 +1838,7 @@
                                             </popUpButton>
                                             <popUpButton translatesAutoresizingMaskIntoConstraints="NO" id="QDr-Cp-9QQ">
                                                 <rect key="frame" x="0.0" y="0.0" width="120" height="103"/>
-                                                <popUpButtonCell key="cell" type="bevel" bezelStyle="regularSquare" image="popUpButtonCell:CNs-lh-urM:image" imagePosition="only" alignment="left" lineBreakMode="truncatingTail" refusesFirstResponder="YES" imageScaling="proportionallyUpOrDown" inset="2" pullsDown="YES" arrowPosition="noArrow" altersStateOfSelectedItem="NO" selectedItem="vmR-CG-qdv" id="8FA-1D-k8p">
+                                                <popUpButtonCell key="cell" type="bevel" bezelStyle="regularSquare" image="popUpButtonCell:A4p-LJ-svz:image" imagePosition="only" alignment="left" lineBreakMode="truncatingTail" refusesFirstResponder="YES" imageScaling="proportionallyUpOrDown" inset="2" pullsDown="YES" arrowPosition="noArrow" altersStateOfSelectedItem="NO" selectedItem="vmR-CG-qdv" id="8FA-1D-k8p">
                                                     <behavior key="behavior" pushIn="YES" lightByBackground="YES" lightByGray="YES"/>
                                                     <font key="font" metaFont="menu"/>
                                                     <menu key="menu" id="8He-mk-LVI">
@@ -1903,9 +1962,11 @@
                             <constraint firstItem="D0w-YC-YlJ" firstAttribute="trailing" secondItem="SEL-hl-0c0" secondAttribute="trailing" id="5wF-ul-W4h"/>
                             <constraint firstItem="D0w-YC-YlJ" firstAttribute="top" secondItem="SEL-hl-0c0" secondAttribute="top" id="8bz-WZ-Szj"/>
                             <constraint firstItem="dGn-a4-c1t" firstAttribute="top" secondItem="SEL-hl-0c0" secondAttribute="top" id="8g8-nm-CxE"/>
+                            <constraint firstItem="ss1-M1-nGn" firstAttribute="trailing" secondItem="iIF-Q5-Onc" secondAttribute="trailing" constant="-11" id="AYX-tI-fE9"/>
                             <constraint firstItem="Ghs-c1-ZkA" firstAttribute="bottom" secondItem="SEL-hl-0c0" secondAttribute="bottom" id="DgS-2W-eVa"/>
                             <constraint firstItem="dGn-a4-c1t" firstAttribute="bottom" secondItem="SEL-hl-0c0" secondAttribute="bottom" id="EBM-Pm-MJ8"/>
                             <constraint firstItem="Gqh-qw-fjy" firstAttribute="top" secondItem="SEL-hl-0c0" secondAttribute="top" id="FF5-Ke-cOk"/>
+                            <constraint firstItem="ss1-M1-nGn" firstAttribute="bottom" secondItem="iIF-Q5-Onc" secondAttribute="bottom" constant="-16" id="Gk9-mO-8Dz"/>
                             <constraint firstAttribute="bottom" secondItem="Fdf-pv-iEw" secondAttribute="bottom" constant="8" id="H1Q-Vj-rPM"/>
                             <constraint firstItem="Ghs-c1-ZkA" firstAttribute="trailing" secondItem="SEL-hl-0c0" secondAttribute="trailing" id="HPu-Oe-CBl"/>
                             <constraint firstItem="iIF-Q5-Onc" firstAttribute="leading" secondItem="m2S-Jp-Qdl" secondAttribute="leading" id="LGA-tZ-gFh"/>
@@ -1916,6 +1977,7 @@
                             <constraint firstItem="D0w-YC-YlJ" firstAttribute="leading" secondItem="SEL-hl-0c0" secondAttribute="leading" id="SVU-d6-DH1"/>
                             <constraint firstItem="Fdf-pv-iEw" firstAttribute="top" secondItem="m2S-Jp-Qdl" secondAttribute="top" constant="8" id="Umg-3A-zmv"/>
                             <constraint firstItem="Gqh-qw-fjy" firstAttribute="leading" secondItem="SEL-hl-0c0" secondAttribute="leading" id="VcW-Wh-wiF"/>
+                            <constraint firstItem="ss1-M1-nGn" firstAttribute="top" secondItem="iIF-Q5-Onc" secondAttribute="top" constant="16" id="VdT-jM-SRU"/>
                             <constraint firstItem="dGn-a4-c1t" firstAttribute="trailing" secondItem="SEL-hl-0c0" secondAttribute="trailing" id="XM9-i5-GOP"/>
                             <constraint firstItem="Fdf-pv-iEw" firstAttribute="leading" secondItem="iIF-Q5-Onc" secondAttribute="trailing" constant="8" id="Xbh-Ub-1Ng"/>
                             <constraint firstItem="SEL-hl-0c0" firstAttribute="top" secondItem="iIF-Q5-Onc" secondAttribute="top" constant="16" id="aWz-Ad-PIM"/>
@@ -1925,6 +1987,7 @@
                             <constraint firstItem="LlM-EV-ruZ" firstAttribute="bottom" secondItem="SEL-hl-0c0" secondAttribute="bottom" id="ltj-Ea-Vtb"/>
                             <constraint firstItem="iIF-Q5-Onc" firstAttribute="top" secondItem="m2S-Jp-Qdl" secondAttribute="top" id="m3e-ww-N7S"/>
                             <constraint firstItem="LlM-EV-ruZ" firstAttribute="trailing" secondItem="SEL-hl-0c0" secondAttribute="trailing" id="nAy-xD-Y3s"/>
+                            <constraint firstItem="ss1-M1-nGn" firstAttribute="leading" secondItem="iIF-Q5-Onc" secondAttribute="leading" constant="11" id="nue-HB-5Zo"/>
                             <constraint firstItem="D0w-YC-YlJ" firstAttribute="bottom" secondItem="SEL-hl-0c0" secondAttribute="bottom" id="qTc-wn-Sqn"/>
                             <constraint firstItem="dGn-a4-c1t" firstAttribute="leading" secondItem="SEL-hl-0c0" secondAttribute="leading" id="xqX-cb-8Hz"/>
                             <constraint firstAttribute="trailing" secondItem="Fdf-pv-iEw" secondAttribute="trailing" constant="8" id="yy6-NU-JJX"/>
@@ -1944,6 +2007,8 @@
                         <outlet property="scanLines" destination="dGn-a4-c1t" id="3Xy-Ku-95P"/>
                         <outlet property="speedometer" destination="FBZ-dh-6Fs" id="L0v-RY-xwB"/>
                         <outlet property="splashScreen" destination="D0w-YC-YlJ" id="WJB-BH-5EP"/>
+                        <outlet property="textDisplay" destination="ccC-Wu-3za" id="2AD-aQ-x6x"/>
+                        <outlet property="textDisplayScroller" destination="ss1-M1-nGn" id="Bbp-M9-REy"/>
                     </connections>
                 </viewController>
                 <customObject id="rPt-NT-nkU" userLabel="First Responder" customClass="NSResponder" sceneMemberID="firstResponder"/>
@@ -1974,7 +2039,7 @@
         <image name="White" width="64" height="64"/>
         <image name="apple_original_logo_design" width="384" height="307.20001220703125"/>
         <image name="dotmatrix_effect" width="268.79998779296875" height="184.32000732421875"/>
-        <image name="popUpButtonCell:CNs-lh-urM:image" width="1" height="1">
+        <image name="popUpButtonCell:A4p-LJ-svz:image" width="1" height="1">
             <mutableData key="keyedArchiveRepresentation">
 YnBsaXN0MDDUAQIDBAUGVVZYJHZlcnNpb25YJG9iamVjdHNZJGFyY2hpdmVyVCR0b3ASAAGGoK8QEgcI
 ExQZHh8jJCsuMTtDR0tPUlUkbnVsbNUJCgsMDQ4PEBESVk5TU2l6ZVYkY2xhc3NcTlNJbWFnZUZsYWdz
diff --git a/A2Mac/HiRes.swift b/A2Mac/HiRes.swift
index 06fbf9b..a24f49b 100644
--- a/A2Mac/HiRes.swift
+++ b/A2Mac/HiRes.swift
@@ -171,19 +171,19 @@ class HiRes: NSView {
     //    let color_orange    : UInt32 = 0xFFEE2211;
     
     // HiRes Colors for the SRGB color space
-    let color_black     : UInt32 = 0x00000000;
-    let color_white     : UInt32 = 0xFFEEEEEE;
-    let color_purple    : UInt32 = 0xFFDD55FF;
-    let color_green     : UInt32 = 0xFF2BD84A;
-    let color_blue      : UInt32 = 0xFF5599FF;
-    let color_orange    : UInt32 = 0xFFFF6302;
+    let color_black     : UInt32 = 0x00000000
+    let color_white     : UInt32 = 0xFFEEEEEE
+    let color_purple    : UInt32 = 0xFFDD55FF
+    let color_green     : UInt32 = 0xFF2BD84A
+    let color_blue      : UInt32 = 0xFF5599FF
+    let color_orange    : UInt32 = 0xFFFF6302
     
     // for debugging only:
-    let color_turquis   : UInt32 = 0xFF11BBBB;
-    let color_yellow    : UInt32 = 0xFFBBBB11;
+    let color_turquis   : UInt32 = 0xFF11BBBB
+    let color_yellow    : UInt32 = 0xFFBBBB11
     
     // default is green
-    var monoColor       : UInt32 = 0xFF2BD84A;
+    var monoColor       : UInt32 = 0xFF2BD84A
     
     
     func refreshChanged( blockSize : Int ) {
diff --git a/A2Mac/ViewController.swift b/A2Mac/ViewController.swift
index b871eb9..fe4e3a7 100644
--- a/A2Mac/ViewController.swift
+++ b/A2Mac/ViewController.swift
@@ -67,6 +67,8 @@ func spk_dn_play() {
 
 class ViewController: NSViewController  {
 
+    @IBOutlet weak var textDisplayScroller: NSScrollView!
+    @IBOutlet var textDisplay: NSTextView!
     @IBOutlet weak var displayField: NSTextField!
     @IBOutlet weak var display: NSTextFieldCell!
     @IBOutlet weak var speedometer: NSTextFieldCell!
@@ -176,8 +178,10 @@ class ViewController: NSViewController  {
         // Animated Splash Screen fade out and (Text) Monitor fade in
         
         hires.isHidden = true
-        displayField.alphaValue = 0
-        displayField.isHidden = false
+//        displayField.alphaValue = 0
+//        displayField.isHidden = false
+        textDisplayScroller.alphaValue = 0
+        textDisplayScroller.isHidden = false
         splashScreen.alphaValue = 1
         splashScreen.isHidden = false
 
@@ -185,11 +189,11 @@ class ViewController: NSViewController  {
             NSAnimationContext.runAnimationGroup({ (context) in
                 context.duration = 0.5
                 // Use the value you want to animate to (NOT the starting value)
-                self.displayField.animator().alphaValue = 1
+                self.textDisplayScroller.animator().alphaValue = 1
                 self.splashScreen.animator().alphaValue = 0
             },
             completionHandler:{ () -> Void in
-                self.displayField.alphaValue = 1
+                self.textDisplayScroller.alphaValue = 1
                 self.splashScreen.isHidden = true
             })
             
@@ -232,8 +236,8 @@ class ViewController: NSViewController  {
         // Animated Splash Screen fade out and (Text) Monitor fade in
         
         hires.isHidden = true
-        displayField.alphaValue = 0
-        displayField.isHidden = false
+        textDisplayScroller.alphaValue = 0
+//        textDisplayScroller.isHidden = false
         splashScreen.alphaValue = 1
         splashScreen.isHidden = false
         
@@ -314,7 +318,7 @@ class ViewController: NSViewController  {
     static let textArraySize = textLines * (textCols + lineEndChars) + textCols * 2
 
     var txtClear = [Character](repeating: " ", count: textArraySize * 2)
-    var txtArr = [Character](repeating: " ", count: textArraySize * 2)
+    var unicodeTextArray = [Character](repeating: " ", count: textArraySize * 2)
 
     var s = String()
     
@@ -354,7 +358,7 @@ class ViewController: NSViewController  {
 
     
     func SelectAll() {
-//        displayField.currentEditor()?.selectAll(nil)
+//        textDisplayScroller.currentEditor()?.selectAll(nil)
         displayField.selectText(nil)
     }
     
@@ -393,21 +397,21 @@ class ViewController: NSViewController  {
         
         if ( Mouse2Joystick ) {
             pdl_prevarr[0] = pdl_valarr[0]
-            pdl_valarr[0] = Double(mouseLocation.x / (displayField.frame.width) )
+            pdl_valarr[0] = Double(mouseLocation.x / (textDisplayScroller.frame.width) )
             pdl_diffarr[0] = pdl_valarr[0] - pdl_prevarr[0]
             
             pdl_prevarr[1] = pdl_valarr[1]
-            pdl_valarr[1] = 1 - Double(mouseLocation.y / (displayField.frame.height) )
+            pdl_valarr[1] = 1 - Double(mouseLocation.y / (textDisplayScroller.frame.height) )
             pdl_diffarr[1] = pdl_valarr[1] - pdl_prevarr[1]
         }
         
         if ( MouseInterface ) {
             pdl_prevarr[2] = pdl_valarr[2]
-            pdl_valarr[2] = Double(mouseLocation.x / (displayField.frame.width) )
+            pdl_valarr[2] = Double(mouseLocation.x / (textDisplayScroller.frame.width) )
             pdl_diffarr[2] = pdl_valarr[2] - pdl_prevarr[2]
             
             pdl_prevarr[3] = pdl_valarr[3]
-            pdl_valarr[3] = 1 - Double(mouseLocation.y / (displayField.frame.height) )
+            pdl_valarr[3] = 1 - Double(mouseLocation.y / (textDisplayScroller.frame.height) )
             pdl_diffarr[3] = pdl_valarr[3] - pdl_prevarr[3]
         }
     }
@@ -658,7 +662,6 @@ class ViewController: NSViewController  {
     
     var shadowTxt : String = ""
     
-    
     func Render() {
         
         frameCnt += 1
@@ -675,7 +678,7 @@ class ViewController: NSViewController  {
         //   1. We can update UI elements
         //   2. it is independent of the simulation, de that is running in the background thread while we are busy with rendering...
         DispatchQueue.main.sync {
-            var txt : String = ""
+            var unicodeTextString : String = ""
             
             var fromLines = 0
             var toLines = self.textLines
@@ -689,12 +692,12 @@ class ViewController: NSViewController  {
                 }
             }
             
-            self.txtArr = self.txtClear
+            self.unicodeTextArray = self.txtClear
             
             // render an empty space to eiminate displaying text portion of the screen covered by graphics
             let charDisposition = videoMode.col80 == 0 ? 1 : 2
             for y in 0 ..< fromLines {
-                self.txtArr[ y * (self.textCols * charDisposition + self.lineEndChars) + self.textCols * charDisposition] = "\n"
+                self.unicodeTextArray[ y * (self.textCols * charDisposition + self.lineEndChars) + self.textCols * charDisposition] = "\n"
             }
             
             // 40 col
@@ -712,10 +715,10 @@ class ViewController: NSViewController  {
                         let idx = Int(byte);
                         let chr = ViewController.charConvTbl[idx]
                         
-                        self.txtArr[ y * (self.textCols + self.lineEndChars) + x ] = chr
+                        self.unicodeTextArray[ y * (self.textCols + self.lineEndChars) + x ] = chr
                     }
                     
-                    self.txtArr[ y * (self.textCols + self.lineEndChars) + self.textCols ] = "\n"
+                    self.unicodeTextArray[ y * (self.textCols + self.lineEndChars) + self.textCols ] = "\n"
                 }
             }
             // 80 col
@@ -732,21 +735,21 @@ class ViewController: NSViewController  {
                         let idx = Int(byte);
                         let chr = ViewController.charConvTbl[idx]
                         
-                        self.txtArr[ y * (self.textCols * 2 + self.lineEndChars) + x * 2 + 1] = chr
+                        self.unicodeTextArray[ y * (self.textCols * 2 + self.lineEndChars) + x * 2 + 1] = chr
                         
                         let byte2 = textAuxBuffer[ ViewController.textLineOfs[y] + x ]
                         let idx2 = Int(byte2);
                         let chr2 = ViewController.charConvTbl[idx2]
                         
-                        self.txtArr[ y * (self.textCols * 2 + self.lineEndChars) + x * 2] = chr2
+                        self.unicodeTextArray[ y * (self.textCols * 2 + self.lineEndChars) + x * 2] = chr2
                     }
                     
-                    self.txtArr[ y * (self.textCols * 2 + self.lineEndChars) + self.textCols * 2] = "\n"
+                    self.unicodeTextArray[ y * (self.textCols * 2 + self.lineEndChars) + self.textCols * 2] = "\n"
                 }
             }
             
             
-            txt = String(self.txtArr)
+            unicodeTextString = String(self.unicodeTextArray)
             
             // TODO: Render text Screen in native C
             //            txt = String(bytesNoCopy: ViewController.textScreen!, length: 10, encoding: .ascii, freeWhenDone: false) ?? "HMM"
@@ -764,9 +767,23 @@ class ViewController: NSViewController  {
                 }
             }
             
-            if ( self.shadowTxt != txt ) {
-                self.shadowTxt = txt
-                self.display.stringValue = txt
+            if ( self.shadowTxt != unicodeTextString ) {
+                self.shadowTxt = unicodeTextString
+//                self.display.stringValue = unicodeTextString
+                self.textDisplay.string = unicodeTextString
+
+//                let bold14 = NSFont.boldSystemFont(ofSize: 14.0)
+//                let textColor = NSColor.red
+//                let attribs = [NSAttributedString.Key.font:bold14,NSAttributedString.Key.foregroundColor:textColor,NSAttributedString.Key.paragraphStyle:textParagraph]
+                
+//                let textParagraph = NSMutableParagraphStyle()
+//                textParagraph.lineSpacing = 0
+//                textParagraph.minimumLineHeight = 32.0
+//                textParagraph.maximumLineHeight = 32.0
+//
+//                let attribs = [NSAttributedString.Key.paragraphStyle: textParagraph]
+//                let attrString:NSAttributedString = NSAttributedString.init(string: unicodeTextString, attributes: attribs)
+//                self.display.attributedStringValue = attrString
             }
             //            self.display.stringValue = "testing\nit\nout"
             
@@ -948,12 +965,13 @@ class ViewController: NSViewController  {
         self.display.font = NSFont(name: "PrintChar21", size: 32)
     }
     
-    
+        
     override func viewDidLoad() {
         super.viewDidLoad()
         
         ViewController.current = self
-        
+        openLog()
+
         hires.clearScreen();
         
         spkr_load_sfx( Bundle.main.resourcePath! + "/sfx" )
@@ -966,7 +984,7 @@ class ViewController: NSViewController  {
                 
 //        createHiRes()
         
-        self.displayField.scaleUnitSquare(to: NSSize(width: 1, height: 1))
+        self.textDisplayScroller.scaleUnitSquare(to: NSSize(width: 1, height: 1))
         
 //        NSEvent.removeMonitor(NSEvent.EventType.flagsChanged)
 //        NSEvent.addLocalMonitorForEvents(matching: .flagsChanged) {
@@ -1116,6 +1134,16 @@ class ViewController: NSViewController  {
     @IBAction func CRTMonitorOnOff(_ sender: NSButton) {
         CRTMonitor = sender.state == .on
         scanLines.isHidden = !CRTMonitor
+        
+        if ( CRTMonitor ) {
+            display.textColor = .white
+            // TODO: Adjust gamma so pixels are brighter
+        }
+        else {
+            display.textColor = colorWhite
+            // TODO: Adjust gamma so pixels are dimmer
+        }
+        
         hires.RenderFullScreen()
     }
     
diff --git a/src/cpu/6502.c b/src/cpu/6502.c
index a086b10..b56aee0 100644
--- a/src/cpu/6502.c
+++ b/src/cpu/6502.c
@@ -696,8 +696,8 @@ void rom_loadFile( const char * bundlePath, const char * filename ) {
 
 
 void openLog() {
-#ifdef DISASSEMBLY
-    outdev = fopen("/Users/trudnai/Library/Containers/com.gamealloy.A2Mac/Data/disassembly_new.log", "w+");
+#ifdef DISASSEMBLER
+    outdev = fopen("/Users/trudnai/Library/Containers/com.trudnai.steveii/Data/disassembly_new.log", "w+");
 #endif
     // for DEBUG ONLY!!! -- use stdout if could not create log file
 //    if (outdev == NULL) {
diff --git a/src/cpu/6502_C.h b/src/cpu/6502_C.h
index e4c1da0..1b4d0e1 100644
--- a/src/cpu/6502_C.h
+++ b/src/cpu/6502_C.h
@@ -3,7 +3,29 @@
 //  A2Mac
 //
 //  Created by Tamas Rudnai on 7/27/20.
-//  Copyright © 2020 GameAlloy. All rights reserved.
+//  Copyright © 2019, 2020 Tamas Rudnai. All rights reserved.
+//
+// This file is part of Steve ][ -- The Apple ][ Emulator.
+//
+// Steve ][ is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// Steve ][ is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with Steve ][.  If not, see <https://www.gnu.org/licenses/>.
+//
+// Documentations:
+//
+// http://nesdev.com/6502_cpu.txt
+// http://www.oxyron.de/html/opcodes02.html
+// https://macgui.com/kb/article/46
+// https://www.masswerk.at/6502/6502_instruction_set.html
 //
 
 #ifndef _6502_C_h
@@ -36,7 +58,7 @@
 // Additional instructions
 
     // BRA - BRanch Always
-        case 0x80: JMP( rel_addr() ); return 3;                         // BRA reladdr
+        case 0x80: BRA( rel_addr() ); return 3;                         // BRA reladdr
 
     // PHX PHY PLX PLY - PusH or PulL X or Y register
         case 0x5A: PHY(); return 3;                                     // PHY
diff --git a/src/cpu/6502_C_Rockwell.h b/src/cpu/6502_C_Rockwell.h
new file mode 100644
index 0000000..faf9a16
--- /dev/null
+++ b/src/cpu/6502_C_Rockwell.h
@@ -0,0 +1,78 @@
+//
+//  6502_und.h
+//  A2Mac
+//
+//  Created by Tamas Rudnai on 7/27/20.
+//  Copyright © 2019, 2020 Tamas Rudnai. All rights reserved.
+//
+// This file is part of Steve ][ -- The Apple ][ Emulator.
+//
+// Steve ][ is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// Steve ][ is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with Steve ][.  If not, see <https://www.gnu.org/licenses/>.
+//
+// Documentations:
+//
+// http://nesdev.com/6502_cpu.txt
+// http://www.oxyron.de/html/opcodes02.html
+// https://macgui.com/kb/article/46
+// https://www.masswerk.at/6502/6502_instruction_set.html
+//
+
+#ifndef _6502_C_Rockwell_h
+#define _6502_C_Rockwell_h
+
+// Additional Rockwell 65C02 and WDC 65C02 instructions
+// Four additional instructions and one additional addressing mode are available on 65C02s manufactured by Rockwell and WDC
+
+    // BBR BBS - Branch on Bit Reset or Set
+        case 0x0F: BBR0( src_zp(), rel_addr() ); return 5;              // BBR0 zpg, rel
+        case 0x1F: BBR1( src_zp(), rel_addr() ); return 5;              // BBR1 zpg, rel
+        case 0x2F: BBR2( src_zp(), rel_addr() ); return 5;              // BBR2 zpg, rel
+        case 0x3F: BBR3( src_zp(), rel_addr() ); return 5;              // BBR3 zpg, rel
+        case 0x4F: BBR4( src_zp(), rel_addr() ); return 5;              // BBR4 zpg, rel
+        case 0x5F: BBR5( src_zp(), rel_addr() ); return 5;              // BBR5 zpg, rel
+        case 0x6F: BBR6( src_zp(), rel_addr() ); return 5;              // BBR6 zpg, rel
+        case 0x7F: BBR7( src_zp(), rel_addr() ); return 5;              // BBR7 zpg, rel
+
+        case 0x8F: BBS0( src_zp(), rel_addr() ); return 5;              // BBS0 zpg, rel
+        case 0x9F: BBS1( src_zp(), rel_addr() ); return 5;              // BBS1 zpg, rel
+        case 0xAF: BBS2( src_zp(), rel_addr() ); return 5;              // BBS2 zpg, rel
+        case 0xBF: BBS3( src_zp(), rel_addr() ); return 5;              // BBS3 zpg, rel
+        case 0xCF: BBS4( src_zp(), rel_addr() ); return 5;              // BBS4 zpg, rel
+        case 0xDF: BBS5( src_zp(), rel_addr() ); return 5;              // BBS5 zpg, rel
+        case 0xEF: BBS6( src_zp(), rel_addr() ); return 5;              // BBS6 zpg, rel
+        case 0xFF: BBS7( src_zp(), rel_addr() ); return 5;              // BBS7 zpg, rel
+
+
+    // RMB SMB - Reset or Set Memory Bit
+        case 0x07: RMB0( src_zp() ); return 5;                          // RMB0 zpg, rel
+        case 0x17: RMB1( src_zp() ); return 5;                          // RMB1 zpg, rel
+        case 0x27: RMB2( src_zp() ); return 5;                          // RMB2 zpg, rel
+        case 0x37: RMB3( src_zp() ); return 5;                          // RMB3 zpg, rel
+        case 0x47: RMB4( src_zp() ); return 5;                          // RMB4 zpg, rel
+        case 0x57: RMB5( src_zp() ); return 5;                          // RMB5 zpg, rel
+        case 0x67: RMB6( src_zp() ); return 5;                          // RMB6 zpg, rel
+        case 0x77: RMB7( src_zp() ); return 5;                          // RMB7 zpg, rel
+
+        case 0x87: SMB0( src_zp() ); return 5;                          // SMB0 zpg, rel
+        case 0x97: SMB1( src_zp() ); return 5;                          // SMB1 zpg, rel
+        case 0xA7: SMB2( src_zp() ); return 5;                          // SMB2 zpg, rel
+        case 0xB7: SMB3( src_zp() ); return 5;                          // SMB3 zpg, rel
+        case 0xC7: SMB4( src_zp() ); return 5;                          // SMB4 zpg, rel
+        case 0xD7: SMB5( src_zp() ); return 5;                          // SMB5 zpg, rel
+        case 0xE7: SMB6( src_zp() ); return 5;                          // SMB6 zpg, rel
+        case 0xF7: SMB7( src_zp() ); return 5;                          // SMB7 zpg, rel
+
+
+
+#endif /* _6502_C_Rockwell_h */
diff --git a/src/cpu/6502_std.h b/src/cpu/6502_std.h
index c0cd280..df27827 100644
--- a/src/cpu/6502_std.h
+++ b/src/cpu/6502_std.h
@@ -3,7 +3,29 @@
 //  A2Mac
 //
 //  Created by Tamas Rudnai on 7/27/20.
-//  Copyright © 2020 GameAlloy. All rights reserved.
+//  Copyright © 2019, 2020 Tamas Rudnai. All rights reserved.
+//
+// This file is part of Steve ][ -- The Apple ][ Emulator.
+//
+// Steve ][ is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// Steve ][ is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with Steve ][.  If not, see <https://www.gnu.org/licenses/>.
+//
+// Documentations:
+//
+// http://nesdev.com/6502_cpu.txt
+// http://www.oxyron.de/html/opcodes02.html
+// https://macgui.com/kb/article/46
+// https://www.masswerk.at/6502/6502_instruction_set.html
 //
 
 #ifndef _6502_std_h
diff --git a/src/cpu/6502_und.h b/src/cpu/6502_und.h
index 3af46db..ec18133 100644
--- a/src/cpu/6502_und.h
+++ b/src/cpu/6502_und.h
@@ -3,7 +3,29 @@
 //  A2Mac
 //
 //  Created by Tamas Rudnai on 7/27/20.
-//  Copyright © 2020 GameAlloy. All rights reserved.
+//  Copyright © 2019, 2020 Tamas Rudnai. All rights reserved.
+//
+// This file is part of Steve ][ -- The Apple ][ Emulator.
+//
+// Steve ][ is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// Steve ][ is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with Steve ][.  If not, see <https://www.gnu.org/licenses/>.
+//
+// Documentations:
+//
+// http://nesdev.com/6502_cpu.txt
+// http://www.oxyron.de/html/opcodes02.html
+// https://macgui.com/kb/article/46
+// https://www.masswerk.at/6502/6502_instruction_set.html
 //
 
 #ifndef _6502_und_h
diff --git a/src/cpu/65C02.c b/src/cpu/65C02.c
index b95c4ad..9325bc1 100644
--- a/src/cpu/65C02.c
+++ b/src/cpu/65C02.c
@@ -253,7 +253,6 @@ INLINE int m6502_Step() {
             dbgPrintf("%04X: Unimplemented Instruction 0x%02X\n", m6502.PC -1, memread( m6502.PC -1 ));
             return 2;
     }
-    //    } // fetch16
     
     return 2;
 }
@@ -443,7 +442,7 @@ void rom_loadFile( const char * bundlePath, const char * filename ) {
 
 
 void openLog() {
-#ifdef DISASSEMBLY
+#ifdef DISASSEMBLER
     outdev = fopen("/Users/trudnai/Library/Containers/com.gamealloy.A2Mac/Data/disassembly_new.log", "w+");
 #endif
     // for DEBUG ONLY!!! -- use stdout if could not create log file
diff --git a/src/cpu/instructions/6502_instr_branch.h b/src/cpu/instructions/6502_instr_branch.h
index 2f05a4f..9a1131a 100644
--- a/src/cpu/instructions/6502_instr_branch.h
+++ b/src/cpu/instructions/6502_instr_branch.h
@@ -208,4 +208,79 @@ INLINE void BVS( int8_t reladdr ) {
     }
 }
 
+/**
+ BBR BBS - Branch on Bit Reset or Set
+ 
+ BBR and BBS test the specified zero page location and branch if the specified bit is clear (BBR) or set (BBS).
+ Note that as with TRB, the term reset in BBR is used to mean clear.
+ 
+ On the 6502 and 65C02, bit 7 is typically the most convenient bit to use for I/O and software flags because
+ it can be tested by several instructions, such as BIT and LDA. BBR and BBS can test any of the 8 bits without
+ affecting any flags or using any registers. Unlike other branch instructions, BBR and BBS always take the same
+ number of cycles (five) whether the branch is taken or not. It is often useful to test bit 0, for example, to test
+ whether a byte is even or odd. However, the usefulness of BBR and BBS is somewhat limited for a couple of reasons.
+ First, there is only a single addressing mode for these instructions -- no indexing by X or Y, for instance.
+ Second, they are restricted to zero page locations. For software flags this may be just fine, but it may not be very
+ convenient (or cost effective) to add any additional address decoding hardware that may be necessary to
+ map I/O locations to the zero page.
+ 
+ The addressing mode is a combination of zero page addressing and relative addressing -- really just a juxtaposition of the two.
+ The bit to test is typically specified as part of the instruction name rather than the operand, i.e.
+ 
+ Flags affected: none
+ 
+ OP LEN CYC MODE   FLAGS    SYNTAX
+ -- --- --- ----   -----    ------
+ 0F 3   5   zp,rel ........ BBR0 $12,LABEL
+ 1F 3   5   zp,rel ........ BBR1 $12,LABEL
+ 2F 3   5   zp,rel ........ BBR2 $12,LABEL
+ 3F 3   5   zp,rel ........ BBR3 $12,LABEL
+ 4F 3   5   zp,rel ........ BBR4 $12,LABEL
+ 5F 3   5   zp,rel ........ BBR5 $12,LABEL
+ 6F 3   5   zp,rel ........ BBR6 $12,LABEL
+ 7F 3   5   zp,rel ........ BBR7 $12,LABEL
+ 8F 3   5   zp,rel ........ BBS0 $12,LABEL
+ 9F 3   5   zp,rel ........ BBS1 $12,LABEL
+ AF 3   5   zp,rel ........ BBS2 $12,LABEL
+ BF 3   5   zp,rel ........ BBS3 $12,LABEL
+ CF 3   5   zp,rel ........ BBS4 $12,LABEL
+ DF 3   5   zp,rel ........ BBS5 $12,LABEL
+ EF 3   5   zp,rel ........ BBS6 $12,LABEL
+ FF 3   5   zp,rel ........ BBS7 $12,LABEL
+ 
+**/
+#define BBR(n) INLINE void BBR##n( uint8_t src, int8_t reladdr ) { \
+dbgPrintf("BBR"#n" "); \
+disPrintf(disassembly.inst, "BBR"#n); \
+    if ( ! (src & (1 << n) ) ) { \
+        BRA( reladdr ); \
+    } \
+}
+
+    BBR(0)
+    BBR(1)
+    BBR(2)
+    BBR(3)
+    BBR(4)
+    BBR(5)
+    BBR(6)
+    BBR(7)
+
+#define BBS(n) INLINE void BBS##n( uint8_t src, int8_t reladdr ) { \
+dbgPrintf("BBS"#n" "); \
+disPrintf(disassembly.inst, "BBS"#n); \
+    if ( (src & (1 << n) ) ) { \
+        BRA( reladdr ); \
+    } \
+}
+
+    BBS(0)
+    BBS(1)
+    BBS(2)
+    BBS(3)
+    BBS(4)
+    BBS(5)
+    BBS(6)
+    BBS(7)
+
 #endif // __6502_INSTR_BRANCH_H__
diff --git a/src/cpu/instructions/6502_instr_set_clr.h b/src/cpu/instructions/6502_instr_set_clr.h
index cfe23de..bd60917 100644
--- a/src/cpu/instructions/6502_instr_set_clr.h
+++ b/src/cpu/instructions/6502_instr_set_clr.h
@@ -136,5 +136,75 @@ INLINE void SEI() {
     m6502.I = 1;
 }
 
+/**
+ RMB SMB - Reset or Set Memory Bit
+ 
+ RMB and SMB clear (RMB) or set (SMB) the specified bit in the specified zero page location,
+ and can be used in conjuction with the BBR and BBS instructions. Again, note that as with BBR and TRB,
+ the term reset in RMB is used to mean clear.
+ 
+ The function of RMB and SMB is very similar to the function of TRB and TSB, except that RMB and SMB
+ can clear or set only one zero page bit, whereas TRB and TSB can clear or set any number of bits. Also,
+ only zero page addressing is available with RMB and SMB, whereas zero page and absolute addressing
+ are available for both TRB and TSB. As a result, RMB and SMB do not offer much that isn't already available
+ with TRB and TSB (which are available on 65C02s from all manufacturers). The main advantages are that
+ RMB and SMB, unlike TRB and TSB, do not use the accumulator, leaving it available, and do not affect any flags.
+ However, it is worth noting that it is rarely useful to preserve the value of the Z (zero) flag (the only flag affected by
+ TRB and TSB), unlike other flags (such as the carry).
+ 
+ Like BBR and BBS, the bit to test is typically specified as part of the instruction name rather than the operand, i.e.
+ 
+ Flags affected: none
+ 
+ OP LEN CYC MODE FLAGS    SYNTAX
+ -- --- --- ---- -----    ------
+ 07 2   5   zp   ........ RMB0 $12
+ 17 2   5   zp   ........ RMB1 $12
+ 27 2   5   zp   ........ RMB2 $12
+ 37 2   5   zp   ........ RMB3 $12
+ 47 2   5   zp   ........ RMB4 $12
+ 57 2   5   zp   ........ RMB5 $12
+ 67 2   5   zp   ........ RMB6 $12
+ 77 2   5   zp   ........ RMB7 $12
+ 87 2   5   zp   ........ SMB0 $12
+ 97 2   5   zp   ........ SMB1 $12
+ A7 2   5   zp   ........ SMB2 $12
+ B7 2   5   zp   ........ SMB3 $12
+ C7 2   5   zp   ........ SMB4 $12
+ D7 2   5   zp   ........ SMB5 $12
+ E7 2   5   zp   ........ SMB6 $12
+ F7 2   5   zp   ........ SMB7 $12
+**/
+#define RMB(n) INLINE void RMB##n( uint8_t zpg ) { \
+    dbgPrintf("RMB"#n" "); \
+    disPrintf(disassembly.inst, "RMB"#n); \
+    WRLOMEM[zpg] &= ~(1 << n); \
+}
+
+    RMB(0)
+    RMB(1)
+    RMB(2)
+    RMB(3)
+    RMB(4)
+    RMB(5)
+    RMB(6)
+    RMB(7)
+
+#define SMB(n) INLINE void SMB##n( uint8_t zpg ) { \
+    dbgPrintf("SMB"#n" "); \
+    disPrintf(disassembly.inst, "SMB"#n); \
+    WRLOMEM[zpg] |= (1 << n); \
+}
+
+    SMB(0)
+    SMB(1)
+    SMB(2)
+    SMB(3)
+    SMB(4)
+    SMB(5)
+    SMB(6)
+    SMB(7)
+
+
 #endif // __6502_INSTR_SET_CLR_H__
 
diff --git a/src/dev/mem/mmio.h b/src/dev/mem/mmio.h
index 0f7b96f..384a6e3 100644
--- a/src/dev/mem/mmio.h
+++ b/src/dev/mem/mmio.h
@@ -442,6 +442,23 @@ void auxMemorySelect( MEMcfg_t newMEMcfg ) {
     MEMcfg = newMEMcfg;
 }
 
+void CxMemorySelect( MEMcfg_t newMEMcfg ) {
+    
+    if ( newMEMcfg.int_Cx_ROM ) {
+        // load internal ROM to memory
+        memcpy(Apple2_64K_MEM + 0xC100, Apple2_16K_ROM + 0x100, 16 * KB - 0x100);
+    }
+    else {
+        // load peripheral ROM to memory
+//        memcpy(Apple2_64K_MEM + 0xC100, Apple2_64K_RAM + 0xC100, 16 * KB - 0x100);
+        memcpy(Apple2_64K_MEM + 0xC600, Apple2_64K_RAM + 0xC600, 0x100);
+    }
+    
+    
+    MEMcfg = newMEMcfg;
+}
+
+
 
 uint8_t * current_RAM_bank = Apple2_64K_AUX + 0xC000;
 
@@ -519,6 +536,10 @@ INLINE void io_RAM_EXP( uint16_t addr ) {
                 break;
         }
         
+        
+        // when was the last time changing LC memory?
+        static uint64_t wram1_clk = 0;
+        
         // is RAM Writeable?
         switch ((uint8_t)addr) {
             case (uint8_t)io_MEM_RDROM_WRAM_2:
@@ -526,8 +547,7 @@ INLINE void io_RAM_EXP( uint16_t addr ) {
                 
             case (uint8_t)io_MEM_RDROM_WRAM_2_:
             case (uint8_t)io_MEM_RDROM_WRAM_1_:
-                
-                //                        printf("RD_ROM + WR_AUX\n");
+//                printf("RD_ROM + WR_AUX\n");
                 
                 // will write directly to Auxiliary RAM, and mark it as NO need to commit from Shadow RAM
                 MEMcfg.WR_RAM = 0;
@@ -545,13 +565,20 @@ INLINE void io_RAM_EXP( uint16_t addr ) {
                 
             case (uint8_t)io_MEM_RDRAM_WRAM_2_:
             case (uint8_t)io_MEM_RDRAM_WRAM_1_:
-                
-                //                        printf("RD_RAM + WR_RAM\n");
-                
-                // will write to Shadow RAM, and mark it as need to commit from Shadow RAM
-                MEMcfg.WR_RAM = 1;
-                WRD0MEM = Apple2_64K_MEM;   // for Write $D000 - $DFFF (shadow memory) - BANK X
-                WRHIMEM = Apple2_64K_MEM;   // for Write $E000 - $FFFF (shadow memory)
+//                printf("RD_RAM + WR_RAM\n");
+                // was this a consequential read?
+                if ( m6502.clktime + clkfrm - wram1_clk < 10 ) {
+                    // will write to Shadow RAM, and mark it as need to commit from Shadow RAM
+                    MEMcfg.WR_RAM = 1;
+                    WRD0MEM = Apple2_64K_MEM;   // for Write $D000 - $DFFF (shadow memory) - BANK X
+                    WRHIMEM = Apple2_64K_MEM;   // for Write $E000 - $FFFF (shadow memory)
+                }
+                // it was too long ago, no write
+                else {
+                    WRD0MEM = Apple2_Dummy_RAM;
+                    WRHIMEM = Apple2_Dummy_RAM;
+                }
+                wram1_clk = m6502.clktime + clkfrm;
                 break;
                 
             default:
@@ -911,13 +938,13 @@ INLINE void ioWrite( uint16_t addr, uint8_t val ) {
         case (uint8_t)io_SETSLOTCXROM:
 //            printf("io_SETSLOTCXROM\n");
             MEMcfg.int_Cx_ROM = 0;
-            // TODO: set Cx00 ROM area table to SLOT
+            CxMemorySelect(MEMcfg);
             break;
 
         case (uint8_t)io_SETINTCXROM:
 //            printf("io_SETINTCXROM\n");
             MEMcfg.int_Cx_ROM = 1;
-            // TODO: set Cx00 ROM area table to INT
+            CxMemorySelect(MEMcfg);
             break;
 
         case (uint8_t)io_SETSLOTC3ROM: