diff --git a/help/CommandLine.html b/help/CommandLine.html
index 9945171e..760e5438 100644
--- a/help/CommandLine.html
+++ b/help/CommandLine.html
@@ -48,6 +48,8 @@
 		Remove the SSC card from slot 2.<br><br>
 		-s3 empty<br>
 		Remove the Uthernet card from slot 3.<br><br>
+		-s3 vidhd<br>
+		Insert a VidHD card into slot 3.<br><br>
 		-s5 diskii<br>
 		Insert a 2nd Disk II controller card into slot 5.<br><br>
 		-s6 empty<br>
diff --git a/help/cfg-config.html b/help/cfg-config.html
index df364682..69a9d549 100644
--- a/help/cfg-config.html
+++ b/help/cfg-config.html
@@ -8,7 +8,7 @@
 		link="#008000" vlink="#008000">
 		<h2 style="COLOR: rgb(0,128,0)">Configuration Settings</h2>
 		<hr size="4">
-		<img style="FLOAT: right; WIDTH: 354px; HEIGHT: 460px" src="img/config.png" alt="Configuration settings"
+		<img style="FLOAT: right; WIDTH: 354px; HEIGHT: 497px" src="img/config.png" alt="Configuration settings"
 			hspace="5" vspace="5">
 	
 		<strong>Model:</strong><br>
@@ -64,6 +64,13 @@
 		When in full-screen mode, show floppy (activity and track) and harddisk status (activity); keyboard caps-lock status and if emulation is paused.<br>
 		<br>
 
+		<strong>VidHD in slot 3</strong><br>
+		Insert a VidHD card into slot 3 (which can co-exist with an 80-column card in the Apple //e's AUX slot).<br>
+		Allows all Apple II models to support the IIgs' Super Hi-Res (SHR) video modes and is supported by eg. <a href="https://archive.org/details/TotalReplay">Total Replay</a>.<br>
+		<br>
+
+		<hr>
+
 		<strong>Serial Port:</strong><br>
 		This option will remap the emulated Apple's serial port to your PC's serial port (or TCP port 1977).<br>
 		See <a href="card-ssc.html">Super Serial Card</a> for more details.<br>
diff --git a/help/cfg-input.html b/help/cfg-input.html
index fa12e146..4503cff3 100644
--- a/help/cfg-input.html
+++ b/help/cfg-input.html
@@ -42,7 +42,7 @@ then you should leave these values at 0.</li>
 On real hardware this card allows up to 4 Atari 9-pin joysticks to be connected.<br>
 Under emulation, the first 2 Windows-detected controllers will be used, and then for joysticks 3 and 4, use keys: ESDF+ZX and IJKL+NM. Note these keys will also be readable from the keyboard.<br>
 <li>The card can be configured in slots 3, 4 or 5.
-<li>Since it only uses the slot's DEVICE SELECT space ($C0Bx for slot 3) then it can co-exist with 80-column cards in the Apple //e's AUX slot. NB. For a real PAL Apple //e, then a slot riser card is required for it to fit.<br>
+<li>Since it only uses the slot's DEVICE SELECT space ($C0Bx for slot 3) then it can co-exist with an 80-column card in the Apple //e's AUX slot. NB. For a real PAL Apple //e, then a slot riser card is required for it to fit.<br>
 See Lukazi's <a href="https://lukazi.blogspot.com/2016/04/apple-ii-4play-joystick-card.html">4Play card</a> and <a href="https://lukazi.blogspot.com/2017/08/apple-ii-4play-joystick-card-software.html">4Play card software</a> blogs for more information.<br>
 <br>
 
@@ -50,7 +50,7 @@ See Lukazi's <a href="https://lukazi.blogspot.com/2016/04/apple-ii-4play-joystic
 On real hardware this card allows up to 2 SNES controllers to be connected and all 12 buttons can be read.<br>
 Under emulation, the first 2 Windows-detected controllers will be used, ideally with 12 (or more) buttons eg. Logitech F310, PlayStation Dualshock 4, DualSense. Note that for some controllers (eg. 8BitDo NES30 Pro) the buttons need remapping, so use the command line switches -snes-max-alt-joy1 or -snes-max-alt-joy2 to remap.<br>
 <li>The card can be configured in slots 3, 4 or 5.
-<li>Since it only uses the slot's DEVICE SELECT space ($C0Bx for slot 3) then it can co-exist with 80-column cards in the Apple //e's AUX slot. NB. This card is small, so no slot riser card is required.<br>
+<li>Since it only uses the slot's DEVICE SELECT space ($C0Bx for slot 3) then it can co-exist with an 80-column card in the Apple //e's AUX slot. NB. This card is small, so no slot riser card is required.<br>
 See Lukazi's <a href="https://lukazi.blogspot.com/2021/06/game-controller-snes-max-snes.html">SNES MAX</a> blog for more information.<br>
 <br>
 <br>
diff --git a/help/img/config.png b/help/img/config.png
index d35785ca..ef045c36 100644
Binary files a/help/img/config.png and b/help/img/config.png differ
diff --git a/help/savestate.html b/help/savestate.html
index ae8035bc..4b5c35e3 100644
--- a/help/savestate.html
+++ b/help/savestate.html
@@ -34,6 +34,7 @@
 		        <li>No-Slot clock</li>
 		        <li>Uthernet card</li>
 		        <li>4Play & SNES MAX joystick cards</li>
+		        <li>VidHD card</li>
 		    </ul>
 		    The following are not yet persisted to the file:
 		    <ul>
diff --git a/source/CPU/cpu_general.inl b/source/CPU/cpu_general.inl
index 451ba476..bc9586d2 100644
--- a/source/CPU/cpu_general.inl
+++ b/source/CPU/cpu_general.inl
@@ -87,8 +87,11 @@ Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 			else {																		\
 				memdirty[addr >> 8] = 0xFF;												\
 				LPBYTE page = memwrite[addr >> 8];										\
-				if (page)																\
+				if (page) {																\
 					*(page+(addr & 0xFF)) = (BYTE)(a);									\
+					if (memVidHD)											/* GH#997 */\
+						*(memVidHD + addr) = (BYTE)(a);									\
+				}																		\
 				else if ((addr & 0xF000) == 0xC000)										\
 					IOWrite[(addr>>4) & 0xFF](regs.pc,addr,1,(BYTE)(a),uExecutedCycles);\
 			}																			\
diff --git a/source/Memory.cpp b/source/Memory.cpp
index 79c914e0..d74d19ef 100644
--- a/source/Memory.cpp
+++ b/source/Memory.cpp
@@ -56,6 +56,7 @@ Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 #include "Tape.h"
 #include "Tfe/tfe.h"
 #include "RGBMonitor.h"
+#include "VidHD.h"
 
 #include "z80emu.h"
 #include "Z80VICE/z80.h"
@@ -142,7 +143,7 @@ SOFT SWITCH STATUS FLAGS
  $C011   R7      BSRBANK2        1=bank2 available    0=bank1 available
  $C012   R7      BSRREADRAM      1=BSR active for read   0=$D000-$FFFF active (BSR = Bank Switch RAM)
  $C013   R7      RAMRD           0=main $0200-$BFFF active reads  1=aux active
- $C014   R7      RAMWRT          0=main $0200-$BFFF active writes 1=aux writes
+ $C014   R7      RAMWRT          0=main $0200-$BFFF active writes 1=aux active
  $C015   R7      INTCXROM        1=main $C100-$CFFF ROM active   0=slot active
  $C016   R7      ALTZP           1=aux $0000-$1FF+auxBSR    0=main available
  $C017   R7      SLOTC3ROM       1=slot $C3 ROM active   0=main $C3 ROM active
@@ -238,6 +239,8 @@ static BOOL    modechanging = 0;				// An Optimisation: means delay calling Upda
 
 static UINT    memrompages = 1;
 
+LPBYTE  memVidHD = NULL;	// For Apple II/II+ writes to aux mem (on VidHD card). memVidHD = memaux or NULL (depends on //e soft-switches)
+
 static CNoSlotClock* g_NoSlotClock = new CNoSlotClock;
 
 #ifdef RAMWORKS
@@ -1494,7 +1497,7 @@ bool MemIsAddrCodeMemory(const USHORT addr)
 void MemInitialize()
 {
 	// ALLOCATE MEMORY FOR THE APPLE MEMORY IMAGE AND ASSOCIATED DATA STRUCTURES
-	memaux   = ALIGNED_ALLOC(_6502_MEM_LEN);
+	memaux   = ALIGNED_ALLOC(_6502_MEM_LEN);	// NB. alloc even if model is Apple II/II+, since it's used by VidHD card
 	memmain  = ALIGNED_ALLOC(_6502_MEM_LEN);
 	memimage = ALIGNED_ALLOC(_6502_MEM_LEN);
 
@@ -1973,7 +1976,7 @@ BYTE __stdcall MemSetPaging(WORD programcounter, WORD address, BYTE write, BYTE
 #endif
 
 	// DETERMINE THE NEW MEMORY PAGING MODE.
-	if (!IS_APPLE2)
+	if (IsAppleIIeOrAbove(GetApple2Type()))
 	{
 		switch (address)
 		{
@@ -2006,6 +2009,15 @@ BYTE __stdcall MemSetPaging(WORD programcounter, WORD address, BYTE write, BYTE
 #endif
 		}
 	}
+	else // Apple ][,][+,][J-Plus or clone ][,][+
+	{
+		if (GetCardMgr().QuerySlot(SLOT3) == CT_VidHD)
+		{
+			VidHDCard* vidHD = dynamic_cast<VidHDCard*>(GetCardMgr().GetObj(SLOT3));
+			vidHD->VideoIOWrite(programcounter, address, write, value, nExecutedCycles);
+			memVidHD = vidHD->IsWriteAux() ? memaux : NULL;
+		}
+	}
 
 	if (IsCopamBase64A(GetApple2Type()))
 	{
diff --git a/source/Memory.h b/source/Memory.h
index 996a5afc..65030d9b 100644
--- a/source/Memory.h
+++ b/source/Memory.h
@@ -25,6 +25,8 @@
 enum
 {
 	// Note: All are in bytes!
+	TEXT_PAGE1_BEGIN         = 0x0400,
+
 	APPLE_SLOT_SIZE          = 0x0100, // 1 page  = $Cx00 .. $CxFF (slot 1 .. 7)
 	APPLE_IO_BEGIN           = 0xC000,
 	APPLE_SLOT_BEGIN         = 0xC100, // each slot has 1 page reserved for it
@@ -57,6 +59,7 @@ extern iofunction IOWrite[256];
 extern LPBYTE     memwrite[0x100];
 extern LPBYTE     mem;
 extern LPBYTE     memdirty;
+extern LPBYTE     memVidHD;
 
 #ifdef RAMWORKS
 const UINT kMaxExMemoryBanks = 127;	// 127 * aux mem(64K) + main mem(64K) = 8MB
diff --git a/source/VidHD.cpp b/source/VidHD.cpp
index 9f987cad..1eb8e758 100644
--- a/source/VidHD.cpp
+++ b/source/VidHD.cpp
@@ -22,15 +22,33 @@
 */
 /*
   Emulate a VidHD card (Blue Shift Inc)
+  * Partial support only *
 
   Allows any Apple II to support the IIgs' 320x200 and 640x200 256-colour Super High-Res video modes.
-  Currently only a //e with 64K aux memory supports SHR mode.
 
-  NB. The extended text modes 80x45, 120x67, 240x135 (and setting FG/BG colours) are not supported yet.
+  NB. Not supported yet:
+  . Apple II/II+ support for //e video modes (TEXT80, DGR, DHGR).
+  . IIgs SCREEN & BORDER COLOR.
+  . IIgs B&W DHGR.
+  . The VidHD extended text modes 80x45, 120x67, 240x135 (and setting FG/BG colours).
+  . Enable/disable VidHD soft-switch.
+
+  Implementation notes:
+  . II/II+
+    . Mirrors the 80STORE/PAGE2/AUXREAD/AUXWRITE switches to VidHD.
+    . Reuses 'memaux' that's for the //e models.
+    . AUXWRITE=1: writes occur to both main & memaux.
+    . 80STORE=1 && PAGE2=1: same as AUXWRITE=1 (but should be changed to *only* allow writes to aux's TEXT1 & HGR2 areas).
+    . Only 6502 (not 65C02) emulation supports this dual write to main & memaux (via the 'memVidHD' pointer):
+      - So a II/II+ with a 65C02 won't correctly support VidHD cards.
+      - And a //e with a 6502 will incur a slight overhead to test 'memVidHD' pointer (which is always NULL for //e's).
+    . VidHD card's save-state includes VidHD's aux mem ($400-$9FFF).
+  . //e with 1KiB 80-Col card: AppleWin doesn't support this - so currently out of scope.
 */
 
 #include "StdAfx.h"
 
+#include "Core.h"
 #include "Memory.h"
 #include "NTSC.h"
 #include "Video.h"
@@ -65,23 +83,28 @@ void VidHDCard::VideoIOWrite(WORD pc, WORD addr, BYTE bWrite, BYTE value, ULONG
 {
 	switch (addr & 0xff)
 	{
-	case 0x22:	// SCREENCOLOR
-		m_SCREENCOLOR = value;
-		break;
-	case 0x29:	// NEWVIDEO
-		m_NEWVIDEO = value;
-		break;
-	case 0x34:	// BORDERCOLOR
-		m_BORDERCOLOR = value;
-		break;
-	case 0x35:	// SHADOW
-		m_SHADOW = value;
-		break;
-	default:
-		_ASSERT(0);
+	case 0x00: m_memMode &= ~MF_80STORE;	break;
+	case 0x01: m_memMode |= MF_80STORE;		break;
+	case 0x02: m_memMode &= ~MF_AUXREAD;	break;
+	case 0x03: m_memMode |= MF_AUXREAD;		break;
+	case 0x04: m_memMode &= ~MF_AUXWRITE;	break;
+	case 0x05: m_memMode |= MF_AUXWRITE;	break;
+	case 0x54: m_memMode &= ~MF_PAGE2;		break;
+	case 0x55: m_memMode |= MF_PAGE2;		break;
+	// IIgs registers
+	case 0x22: m_SCREENCOLOR = value;		break;
+	case 0x29: m_NEWVIDEO = value;			break;
+	case 0x34: m_BORDERCOLOR = value;		break;
+	case 0x35: m_SHADOW = value;			break;
 	}
 }
 
+bool VidHDCard::IsWriteAux(void)
+{
+	return (m_memMode & MF_AUXWRITE) ||							// Write to aux: $200-$BFFF
+		((m_memMode & MF_80STORE) && (m_memMode & MF_PAGE2));	// Write to aux: $400-$7FF and $2000-$3FFF
+}
+
 //===========================================================================
 
 #pragma pack(push)
@@ -154,6 +177,7 @@ void VidHDCard::UpdateSHRCell(bool is640Mode, bool isColorFillMode, uint16_t add
 
 static const UINT kUNIT_VERSION = 1;
 
+#define SS_YAML_KEY_MEMORYMODE "Memory Mode"
 #define SS_YAML_KEY_SCREEN_COLOR "Screen Color"
 #define SS_YAML_KEY_NEW_VIDEO "New Video"
 #define SS_YAML_KEY_BORDER_COLOR "Border Color"
@@ -165,15 +189,31 @@ std::string VidHDCard::GetSnapshotCardName(void)
 	return name;
 }
 
+static std::string MemGetSnapshotAuxMemStructName(void)
+{
+	static const std::string name("Auxiliary Memory Bank");
+	return name;
+}
+
 void VidHDCard::SaveSnapshot(YamlSaveHelper& yamlSaveHelper)
 {
 	YamlSaveHelper::Slot slot(yamlSaveHelper, GetSnapshotCardName(), m_slot, kUNIT_VERSION);
 
 	YamlSaveHelper::Label unit(yamlSaveHelper, "%s:\n", SS_YAML_KEY_STATE);
+	yamlSaveHelper.SaveHexUint32(SS_YAML_KEY_MEMORYMODE, m_memMode);
 	yamlSaveHelper.SaveHexUint8(SS_YAML_KEY_SCREEN_COLOR, m_SCREENCOLOR);
 	yamlSaveHelper.SaveHexUint8(SS_YAML_KEY_NEW_VIDEO, m_NEWVIDEO);
 	yamlSaveHelper.SaveHexUint8(SS_YAML_KEY_BORDER_COLOR, m_BORDERCOLOR);
 	yamlSaveHelper.SaveHexUint8(SS_YAML_KEY_SHADOW, m_SHADOW);
+
+	if (IsApple2PlusOrClone(GetApple2Type()))	// Save aux mem for II/II+
+	{
+		// Save [$400-$9FFF]
+		YamlSaveHelper::Label state(yamlSaveHelper, "%s:\n", MemGetSnapshotAuxMemStructName().c_str());
+
+		LPBYTE pMemBase = MemGetBankPtr(1);
+		yamlSaveHelper.SaveMemory(pMemBase, (SHR_MEMORY_END + 1) - TEXT_PAGE1_BEGIN, TEXT_PAGE1_BEGIN);
+	}
 }
 
 bool VidHDCard::LoadSnapshot(YamlLoadHelper& yamlLoadHelper, UINT version)
@@ -181,10 +221,23 @@ bool VidHDCard::LoadSnapshot(YamlLoadHelper& yamlLoadHelper, UINT version)
 	if (version < 1 || version > kUNIT_VERSION)
 		throw std::runtime_error("Card: wrong version");
 
+	m_memMode = yamlLoadHelper.LoadUint(SS_YAML_KEY_MEMORYMODE);
 	m_SCREENCOLOR = yamlLoadHelper.LoadUint(SS_YAML_KEY_SCREEN_COLOR);
 	m_NEWVIDEO = yamlLoadHelper.LoadUint(SS_YAML_KEY_NEW_VIDEO);
 	m_BORDERCOLOR = yamlLoadHelper.LoadUint(SS_YAML_KEY_BORDER_COLOR);
 	m_SHADOW = yamlLoadHelper.LoadUint(SS_YAML_KEY_SHADOW);
 
+	if (IsApple2PlusOrClone(GetApple2Type()))	// Load aux mem for II/II+
+	{
+		// Load [$400-$9FFF]
+		if (!yamlLoadHelper.GetSubMap(MemGetSnapshotAuxMemStructName()))
+			throw std::runtime_error("Memory: Missing map name: " + MemGetSnapshotAuxMemStructName());
+
+		LPBYTE pMemBase = MemGetBankPtr(1);
+		yamlLoadHelper.LoadMemory(pMemBase, (SHR_MEMORY_END + 1) - TEXT_PAGE1_BEGIN, TEXT_PAGE1_BEGIN);
+
+		yamlLoadHelper.PopMap();
+	}
+
 	return true;
 }
diff --git a/source/VidHD.h b/source/VidHD.h
index 8652c278..df512706 100644
--- a/source/VidHD.h
+++ b/source/VidHD.h
@@ -9,6 +9,7 @@ public:
 	VidHDCard(UINT slot) :
 		Card(CT_VidHD, slot)
 	{
+		m_memMode = 0;
 		m_SCREENCOLOR = 0;
 		m_NEWVIDEO = 0;
 		m_BORDERCOLOR = 0;
@@ -27,8 +28,9 @@ public:
 
 	void VideoIOWrite(WORD pc, WORD addr, BYTE bWrite, BYTE value, ULONG nExecutedCycles);
 
-	bool IsSHR(void) { return (m_NEWVIDEO & 0xC0) == 0xC0; }	// 11000001 = Enable SHR(b7) | Linearize SHR video memory(b6)
+	bool IsSHR(void) { return (m_NEWVIDEO & 0xC0) == 0xC0; }	// 11000000 = Enable SHR(b7) | Linearize SHR video memory(b6)
 	bool IsDHGRBlackAndWhite(void) { return (m_NEWVIDEO & (1 << 5)) ? true : false; }
+	bool IsWriteAux(void);
 
 	static void UpdateSHRCell(bool is640Mode, bool isColorFillMode, uint16_t addrPalette, bgra_t* pVideoAddress, uint32_t a);
 
@@ -37,6 +39,8 @@ public:
 	virtual bool LoadSnapshot(YamlLoadHelper& yamlLoadHelper, UINT version);
 
 private:
+	const UINT SHR_MEMORY_END = 0x9FFF;
+	UINT m_memMode;	// Only used by II/II+
 	BYTE m_SCREENCOLOR;
 	BYTE m_NEWVIDEO;
 	BYTE m_BORDERCOLOR;
diff --git a/source/YamlHelper.cpp b/source/YamlHelper.cpp
index d50d6583..e0f74966 100644
--- a/source/YamlHelper.cpp
+++ b/source/YamlHelper.cpp
@@ -198,7 +198,7 @@ std::string YamlHelper::GetMapValue(MapYaml& mapYaml, const std::string& key, bo
 	return value;
 }
 
-bool YamlHelper::GetSubMap(MapYaml** mapYaml, const std::string& key, const bool canBeNull = false)
+bool YamlHelper::GetSubMap(MapYaml** mapYaml, const std::string& key, const bool canBeNull/*=false*/)
 {
 	MapYaml::const_iterator iter = (*mapYaml)->find(key);
 	if (iter == (*mapYaml)->end() || (!canBeNull && iter->second.subMap == NULL))
@@ -247,7 +247,7 @@ void YamlHelper::MakeAsciiToHexTable(void)
 		m_AsciiToHex[i] = i - 'a' + 0xA;
 }
 
-UINT YamlHelper::LoadMemory(MapYaml& mapYaml, const LPBYTE pMemBase, const size_t kAddrSpaceSize)
+UINT YamlHelper::LoadMemory(MapYaml& mapYaml, const LPBYTE pMemBase, const size_t kAddrSpaceSize, const UINT offset)
 {
 	UINT bytes = 0;
 
@@ -255,11 +255,11 @@ UINT YamlHelper::LoadMemory(MapYaml& mapYaml, const LPBYTE pMemBase, const size_
 	{
 		const char* pKey = it->first.c_str();
 		UINT addr = strtoul(pKey, NULL, 16);
-		if (addr >= kAddrSpaceSize)
+		if (addr >= (kAddrSpaceSize + offset))
 			throw std::runtime_error("Memory: line address too big: " + it->first);
 
 		LPBYTE pDst = (LPBYTE) (pMemBase + addr);
-		const LPBYTE pDstEnd = (LPBYTE) (pMemBase + kAddrSpaceSize);
+		const LPBYTE pDstEnd = (LPBYTE) (pMemBase + kAddrSpaceSize + offset);
 
 		if (it->second.subMap)
 			throw std::runtime_error("Memory: unexpected sub-map");
@@ -385,15 +385,15 @@ double YamlLoadHelper::LoadDouble(const std::string& key)
 	return strtod(value.c_str(), NULL);
 }
 
-void YamlLoadHelper::LoadMemory(const LPBYTE pMemBase, const size_t size)
+void YamlLoadHelper::LoadMemory(const LPBYTE pMemBase, const size_t size, const UINT offset/*=0*/)
 {
-	m_yamlHelper.LoadMemory(*m_pMapYaml, pMemBase, size);
+	m_yamlHelper.LoadMemory(*m_pMapYaml, pMemBase, size, offset);
 }
 
-void YamlLoadHelper::LoadMemory(std::vector<BYTE>& memory, const size_t size)
+void YamlLoadHelper::LoadMemory(std::vector<BYTE>& memory, const size_t size, const UINT offset/*=0*/)
 {
 	memory.reserve(size);	// expand (but don't shrink) vector's capacity (NB. vector's size doesn't change)
-	const UINT bytes = m_yamlHelper.LoadMemory(*m_pMapYaml, &memory[0], size);
+	const UINT bytes = m_yamlHelper.LoadMemory(*m_pMapYaml, &memory[0], size, offset);
 	memory.resize(bytes);	// resize so that vector contains /bytes/ elements - so that size() gives correct value.
 }
 
@@ -519,7 +519,7 @@ void YamlSaveHelper::SaveDouble(const char* key, double value)
 }
 
 // Pre: uMemSize must be multiple of 8
-void YamlSaveHelper::SaveMemory(const LPBYTE pMemBase, const UINT uMemSize)
+void YamlSaveHelper::SaveMemory(const LPBYTE pMemBase, const UINT uMemSize, const UINT offset/*=0*/)
 {
 	if (uMemSize & 7)
 		throw std::runtime_error("Memory: size must be multiple of 8");
@@ -532,23 +532,23 @@ void YamlSaveHelper::SaveMemory(const LPBYTE pMemBase, const UINT uMemSize)
 	size_t lineSize = kIndent+6+2*kStride+2;	// "AAAA: 00010203...3F\n\00" = 6+ 2*64 +2
 	char* const pLine = new char [lineSize];
 
-	for(DWORD dwOffset = 0x0000; dwOffset < uMemSize; dwOffset+=kStride)
+	for (DWORD addr = offset; addr < (uMemSize + offset); addr += kStride)
 	{
 		char* pDst = pLine;
 		for (UINT i=0; i<kIndent; i++)
 			*pDst++ = ' ';
-		*pDst++ = szHex[ (dwOffset>>12)&0xf ];
-		*pDst++ = szHex[ (dwOffset>>8)&0xf ];
-		*pDst++ = szHex[ (dwOffset>>4)&0xf ];
-		*pDst++ = szHex[  dwOffset&0xf ];
+		*pDst++ = szHex[ (addr>>12)&0xf ];
+		*pDst++ = szHex[ (addr>>8)&0xf ];
+		*pDst++ = szHex[ (addr>>4)&0xf ];
+		*pDst++ = szHex[  addr&0xf ];
 		*pDst++ = ':';
 		*pDst++ = ' ';
 
-		LPBYTE pMem = pMemBase + dwOffset;
+		LPBYTE pMem = pMemBase + addr;
 
 		for (UINT i=0; i<kStride; i+=8)
 		{
-			if (dwOffset + i >= uMemSize)	// Support short final line (still multiple of 8 bytes)
+			if (addr + i >= (uMemSize + offset))	// Support short final line (still multiple of 8 bytes)
 			{
 				lineSize = lineSize - 2*kStride + 2*i;
 				break;
diff --git a/source/YamlHelper.h b/source/YamlHelper.h
index 1049c437..f577dc4f 100644
--- a/source/YamlHelper.h
+++ b/source/YamlHelper.h
@@ -49,8 +49,8 @@ private:
 	void GetNextEvent(void);
 	int ParseMap(MapYaml& mapYaml);
 	std::string GetMapValue(MapYaml& mapYaml, const std::string &key, bool& bFound);
-	UINT LoadMemory(MapYaml& mapYaml, const LPBYTE pMemBase, const size_t kAddrSpaceSize);
-	bool GetSubMap(MapYaml** mapYaml, const std::string &key, const bool canBeNull /*= false*/);
+	UINT LoadMemory(MapYaml& mapYaml, const LPBYTE pMemBase, const size_t kAddrSpaceSize, const UINT offset);
+	bool GetSubMap(MapYaml** mapYaml, const std::string &key, const bool canBeNull=false);
 	void GetMapRemainder(std::string& mapName, MapYaml& mapYaml);
 
 	void MakeAsciiToHexTable(void);
@@ -100,8 +100,8 @@ public:
 	std::string LoadString(const std::string& key);
 	float LoadFloat(const std::string & key);
 	double LoadDouble(const std::string & key);
-	void LoadMemory(const LPBYTE pMemBase, const size_t size);
-	void LoadMemory(std::vector<BYTE>& memory, const size_t size);
+	void LoadMemory(const LPBYTE pMemBase, const size_t size, const UINT offset=0);
+	void LoadMemory(std::vector<BYTE>& memory, const size_t size, const UINT offset=0);
 
 	bool GetSubMap(const std::string & key, const bool canBeNull=false)
 	{
@@ -228,7 +228,7 @@ public:
 	void SaveString(const char* key, const std::string & value);
 	void SaveFloat(const char* key, float value);
 	void SaveDouble(const char* key, double value);
-	void SaveMemory(const LPBYTE pMemBase, const UINT uMemSize);
+	void SaveMemory(const LPBYTE pMemBase, const UINT uMemSize, const UINT offset=0);
 
 	class Label
 	{
diff --git a/test/TestCPU6502/TestCPU6502.cpp b/test/TestCPU6502/TestCPU6502.cpp
index 2258d80c..4354d900 100644
--- a/test/TestCPU6502/TestCPU6502.cpp
+++ b/test/TestCPU6502/TestCPU6502.cpp
@@ -14,6 +14,7 @@ SynchronousEventManager g_SynchronousEventMgr;
 LPBYTE         memwrite[0x100];		// TODO: Init
 LPBYTE         mem          = NULL;	// TODO: Init
 LPBYTE         memdirty     = NULL;	// TODO: Init
+LPBYTE         memVidHD     = NULL;	// TODO: Init
 iofunction		IORead[256] = {0};	// TODO: Init
 iofunction		IOWrite[256] = {0};	// TODO: Init