diff --git a/.gitignore b/.gitignore
index ec8f081..dfd6d07 100644
--- a/.gitignore
+++ b/.gitignore
@@ -353,3 +353,4 @@ make/oscar64
 *.mapd
 *.idb
 oscar64/Releasex64/oscar64.vcxproj.FileListAbsolute.txt
+/oscar64/Debugx64
diff --git a/oscar64/DiskImage.cpp b/oscar64/DiskImage.cpp
index 0bbe7f4..d8d4b4c 100644
--- a/oscar64/DiskImage.cpp
+++ b/oscar64/DiskImage.cpp
@@ -31,6 +31,8 @@ static char A2P(char ch)
 
 DiskImage::DiskImage(const char* fname)
 {
+	mInterleave = 10;
+
 	for (int i = 0; i < 41; i++)
 		for (int j = 0; j < 21; j++)
 			memset(mSectors[i][j], 0, 256);
@@ -104,7 +106,7 @@ int DiskImage::AllocBAMSector(int track, int sector)
 
 	if (dp[0] > 0)
 	{
-		sector += 4;
+		sector += mInterleave;
 		if (sector >= SectorsPerTrack[track])
 			sector -= SectorsPerTrack[track];
 
@@ -228,8 +230,10 @@ void DiskImage::CloseFile(void)
 }
 
 
-bool DiskImage::WriteFile(const char* fname, bool compressed)
+bool DiskImage::WriteFile(const char* fname, bool compressed, int interleave)
 {
+	mInterleave = interleave;
+
 	FILE* file;
 	fopen_s(&file, fname, "rb");
 	if (file)
diff --git a/oscar64/DiskImage.h b/oscar64/DiskImage.h
index 6541630..19ed9d0 100644
--- a/oscar64/DiskImage.h
+++ b/oscar64/DiskImage.h
@@ -14,7 +14,7 @@ public:
 	void CloseFile(void);
 
 	int WriteBytes(const uint8* data, ptrdiff_t size);
-	bool WriteFile(const char* fname, bool compressed);
+	bool WriteFile(const char* fname, bool compressed, int interleave);
 
 protected:
 	uint8		mSectors[41][21][256];
@@ -24,6 +24,6 @@ protected:
 	int AllocBAMTrack(int track);
 
 	uint8	*	mDirEntry;
-	int			mTrack, mSector, mBytes;
+	int			mTrack, mSector, mBytes, mInterleave;
 
 };
diff --git a/oscar64/NativeCodeGenerator.cpp b/oscar64/NativeCodeGenerator.cpp
index 65e669c..51ec116 100644
--- a/oscar64/NativeCodeGenerator.cpp
+++ b/oscar64/NativeCodeGenerator.cpp
@@ -21752,6 +21752,8 @@ bool NativeCodeBasicBlock::PropagateSinglePath(void)
 				live |= LIVE_CPU_REG_X;
 			if (mExitRequiredRegs[CPU_REG_Y])
 				live |= LIVE_CPU_REG_Y;
+			if (mExitRequiredRegs[CPU_REG_C])
+				live |= LIVE_CPU_REG_C;
 
 			int i = 0;
 			while (i < mIns.Size())
@@ -31250,7 +31252,7 @@ bool NativeCodeBasicBlock::MoveStoreXUp(int at)
 
 			if (mIns[at - 1].mMode == ASMIM_ABSOLUTE_X && inc)
 			{
-				if (mIns[at - 1].mLinkerObject && mIns[at - 1].mLinkerObject->mSize > 255)
+				if (!mIns[at - 1].mLinkerObject || mIns[at - 1].mLinkerObject->mSize > 255)
 					return done;
 			}
 
@@ -34888,16 +34890,24 @@ bool NativeCodeBasicBlock::OptimizeSimpleLoopInvariant(NativeCodeProcedure* proc
 						else
 							t = ASMIT_INX;
 
-						mIns[i].mType = ASMIT_NOP;
-						mIns[i].mMode = ASMIM_IMPLIED;
-
-						if (needRecheck)
+						if (i < ei)
 						{
-							mIns[ei].mLive |= LIVE_CPU_REG_A;
-							mIns.Insert(ei + 1, NativeCodeInstruction(mIns[ei].mIns, ASMIT_ORA, ASMIM_IMMEDIATE, 0));
-						}
+							mIns[i].mType = ASMIT_NOP;
+							mIns[i].mMode = ASMIM_IMPLIED;
 
-						mIns.Insert(ei + 1, NativeCodeInstruction(mIns[i].mIns, t));
+							if (needRecheck)
+							{
+								mIns[ei].mLive |= LIVE_CPU_REG_A;
+								mIns.Insert(ei + 1, NativeCodeInstruction(mIns[ei].mIns, ASMIT_ORA, ASMIM_IMMEDIATE, 0));
+							}
+
+							mIns.Insert(ei + 1, NativeCodeInstruction(mIns[i].mIns, t));
+						}
+						else
+						{
+							mIns[i].mType = t;
+							mIns[i].mMode = ASMIM_IMPLIED;
+						}
 
 						for (int i = 0; i < mIns.Size(); i++)
 							mIns[i].mLive |= LIVE_CPU_REG_X;
@@ -42402,10 +42412,10 @@ bool NativeCodeBasicBlock::PeepHoleOptimizer(NativeCodeProcedure* proc, int pass
 						progress = true;
 					}
 					else if (
-						mIns[i + 0].mType == ASMIT_STA && 
+						mIns[i + 0].mType == ASMIT_STA &&
 						mIns[i + 1].IsShiftOrInc() &&
-						mIns[i + 2].mType == ASMIT_LDA && mIns[i + 2].SameEffectiveAddress(mIns[i + 0]) && 
-						!mIns[i + 2].SameEffectiveAddress(mIns[i + 1]) && 
+						mIns[i + 2].mType == ASMIT_LDA && mIns[i + 2].SameEffectiveAddress(mIns[i + 0]) &&
+						!mIns[i + 2].SameEffectiveAddress(mIns[i + 1]) &&
 						!(mIns[i + 2].mMode == ASMIM_INDIRECT_Y && mIns[i + 1].mMode == ASMIM_ZERO_PAGE && (mIns[i + 1].mAddress == mIns[i + 2].mAddress || mIns[i + 1].mAddress == mIns[i + 2].mAddress + 1)) &&
 						!(mIns[i + 2].mLive & LIVE_CPU_REG_Z))
 					{
@@ -42509,7 +42519,7 @@ bool NativeCodeBasicBlock::PeepHoleOptimizer(NativeCodeProcedure* proc, int pass
 					}
 					else if (
 						mIns[i + 0].ChangesAccuAndFlag() && (mIns[i + 0].mMode == ASMIM_IMMEDIATE || mIns[i + 0].mMode == ASMIM_ZERO_PAGE) &&
-						mIns[i + 1].mType == ASMIT_LDY && 
+						mIns[i + 1].mType == ASMIT_LDY &&
 						mIns[i + 2].mType == ASMIT_ORA && mIns[i + 2].mMode == ASMIM_IMMEDIATE && mIns[i + 2].mAddress == 0)
 					{
 						mIns[i + 2] = mIns[i + 0];
@@ -43236,7 +43246,26 @@ bool NativeCodeBasicBlock::PeepHoleOptimizer(NativeCodeProcedure* proc, int pass
 						mIns[i + 2].mType = ASMIT_NOP; mIns[i + 2].mMode = ASMIM_IMPLIED;
 						progress = true;
 					}
-
+					else if (
+						mIns[i + 2].mType == ASMIT_TXA && !(mIns[i + 2].mLive & LIVE_CPU_REG_A) &&
+						(mIns[i + 0].mType == ASMIT_INX || mIns[i + 0].mType == ASMIT_DEX) &&
+						!mIns[i + 1].ChangesXReg() && !mIns[i + 1].ChangesZFlag())
+					{
+						mIns[i + 0].mLive |= LIVE_CPU_REG_Z;
+						mIns[i + 1].mLive |= LIVE_CPU_REG_Z;
+						mIns[i + 2].mType = ASMIT_NOP; mIns[i + 2].mMode = ASMIM_IMPLIED;
+						progress = true;
+					}
+					else if (
+						mIns[i + 2].mType == ASMIT_TYA && !(mIns[i + 2].mLive & LIVE_CPU_REG_A) &&
+						(mIns[i + 0].mType == ASMIT_INY || mIns[i + 0].mType == ASMIT_DEY) &&
+						!mIns[i + 1].ChangesYReg() && !mIns[i + 1].ChangesZFlag())
+					{
+						mIns[i + 0].mLive |= LIVE_CPU_REG_Z;
+						mIns[i + 1].mLive |= LIVE_CPU_REG_Z;
+						mIns[i + 2].mType = ASMIT_NOP; mIns[i + 2].mMode = ASMIM_IMPLIED;
+						progress = true;
+					}
 					else if (
 						mIns[i + 0].mType == ASMIT_STA && mIns[i + 0].mMode == ASMIM_ZERO_PAGE &&
 						mIns[i + 1].mType == ASMIT_LDA && mIns[i + 1].mMode == ASMIM_ZERO_PAGE &&
@@ -44717,6 +44746,21 @@ bool NativeCodeBasicBlock::PeepHoleOptimizer(NativeCodeProcedure* proc, int pass
 						progress = true;
 					}
 #endif
+#if 1
+					else if (
+						mIns[i + 0].mType == ASMIT_LDX && 
+						mIns[i + 1].mType == ASMIT_DEX &&
+						mIns[i + 2].mType == ASMIT_STX && mIns[i + 2].SameEffectiveAddress(mIns[i + 0]) && HasAsmInstructionMode(ASMIT_DEC, mIns[i + 0].mMode) &&
+						mIns[i + 3].mType == ASMIT_TXA && !(mIns[i + 3].mLive & LIVE_CPU_REG_X))
+					{
+						mIns[i + 0].mType = ASMIT_DEC;
+						mIns[i + 1].mType = ASMIT_NOP; mIns[i + 1].mMode = ASMIM_IMPLIED;
+						mIns[i + 2].mType = ASMIT_LDA; mIns[i + 2].mLive = mIns[i + 3].mLive;
+						mIns[i + 3].mType = ASMIT_NOP; mIns[i + 3].mMode = ASMIM_IMPLIED;
+
+						progress = true;
+					}
+#endif
 #if 1
 					else if (
 						mIns[i + 0].mType == ASMIT_LDA && mIns[i + 0].mMode == ASMIM_IMMEDIATE &&
@@ -48249,7 +48293,7 @@ void NativeCodeProcedure::Compile(InterCodeProcedure* proc)
 	mInterProc = proc;
 	mInterProc->mLinkerObject->mNativeProc = this;
 
-	CheckFunc = !strcmp(mInterProc->mIdent->mString, "longor");
+	CheckFunc = !strcmp(mInterProc->mIdent->mString, "read_decompress");
 
 	int	nblocks = proc->mBlocks.Size();
 	tblocks = new NativeCodeBasicBlock * [nblocks];
diff --git a/oscar64/oscar64.cpp b/oscar64/oscar64.cpp
index 5e2f9d4..2f147c0 100644
--- a/oscar64/oscar64.cpp
+++ b/oscar64/oscar64.cpp
@@ -67,6 +67,7 @@ int main2(int argc, const char** argv)
 	{
 		char	basePath[200], crtPath[200], includePath[200], targetPath[200], diskPath[200];
 		char	strProductName[100], strProductVersion[200];
+		int		dataFileInterleave = 10;
 
 #ifdef _WIN32
 			GetProductAndVersion(strProductName, strProductVersion);
@@ -152,6 +153,10 @@ int main2(int argc, const char** argv)
 					dataFiles.Push(arg + 4);
 					dataFileCompressed.Push(true);
 				}
+				else if (arg[1] == 'f' && arg[2] == 'i' && arg[3] == '=')
+				{
+					dataFileInterleave = atoi(arg + 4);
+				}
 				else if (arg[1] == 'o' && arg[2] == '=')
 				{
 					strcpy_s(targetPath, arg + 3);
@@ -512,7 +517,7 @@ int main2(int argc, const char** argv)
 				{
 					for (int i = 0; i < dataFiles.Size(); i++)
 					{
-						if (!d64->WriteFile(dataFiles[i], dataFileCompressed[i]))
+						if (!d64->WriteFile(dataFiles[i], dataFileCompressed[i], dataFileInterleave))
 						{
 							printf("Could not embed disk file %s\n", dataFiles[i]);
 							return 20;