diff --git a/README.md b/README.md
index acd1ecf..ee3e79d 100644
--- a/README.md
+++ b/README.md
@@ -120,6 +120,7 @@ The compiler is command line driven, and creates an executable .prg file.
 * -Os : optimize for size
 * -Oi : enable auto inline of small functions (part of O2/O3)
 * -Oa : optimize inline assembler (part of O2/O3)
+* -Oa : optimize inline assembler (part of O2/O3)
 * -Oz : enable auto placement of global variables in zero page (part of O3)
 * -Op : optimize constant parameters
 * -g : create source level debug info and add source line numbers to asm listing
@@ -133,6 +134,7 @@ The compiler is command line driven, and creates an executable .prg file.
 * -cid : cartridge type ID, used by vice emulator
 * -pp : compile in C++ mode
 * -psci : use PETSCII encoding for all strings without prefix
+* -rpt : generate error files .error.map, .error.asm when linker fails
 
 A list of source files can be provided.
 
diff --git a/include/string.c b/include/string.c
index 1ae6764..c711a98 100644
--- a/include/string.c
+++ b/include/string.c
@@ -223,8 +223,8 @@ void * memmove(void * dst, const void * src, int size)
 	int	sz = size;
 	if (sz > 0)
 	{
-		char		*	d = dst;
-		const char	*	s = src;
+		char		*	d = (char *)dst;
+		const char	*	s = (const char *)src;
 		if (d < s)
 		{
 			do {
@@ -245,7 +245,7 @@ void * memmove(void * dst, const void * src, int size)
 
 int memcmp(const void * ptr1, const void * ptr2, int size)
 {
-	const char	*	p = ptr1, * q = ptr2;
+	const char	*	p = (const char *)ptr1, * q = (const char *)ptr2;
 	char		c, d;
 
 	while (size--)
diff --git a/oscar64/Compiler.cpp b/oscar64/Compiler.cpp
index d976804..66675d4 100644
--- a/oscar64/Compiler.cpp
+++ b/oscar64/Compiler.cpp
@@ -1188,6 +1188,82 @@ bool Compiler::BuildLZO(const char* targetPath)
 	}
 }
 
+bool Compiler::RemoveErrorFile(const char* targetPath)
+{
+	char	prgPath[200], mapPath[200], asmPath[200], intPath[200];
+	char	basePath[200];
+
+	strcpy_s(basePath, targetPath);
+	ptrdiff_t	i = strlen(basePath);
+	while (i > 0 && basePath[i - 1] != '/' && basePath[i - 1] != '\\' && basePath[i - 1] != ':')
+		i--;
+	if (i > 0)
+		basePath[i] = 0;
+
+	strcpy_s(prgPath, targetPath);
+	i = strlen(prgPath);
+	while (i > 0 && prgPath[i - 1] != '.')
+		i--;
+	if (i > 0)
+		prgPath[i] = 0;
+
+	strcpy_s(mapPath, prgPath);
+	strcpy_s(asmPath, prgPath);
+	strcpy_s(intPath, prgPath);
+
+	strcat_s(mapPath, "error.map");
+	strcat_s(asmPath, "error.asm");
+	strcat_s(intPath, "error.int");
+
+	remove(mapPath);
+	remove(asmPath);
+	remove(intPath);
+
+	return true;
+}
+
+bool Compiler::WriteErrorFile(const char* targetPath)
+{
+	char	prgPath[200], mapPath[200], asmPath[200], intPath[200];
+	char	basePath[200];
+
+	strcpy_s(basePath, targetPath);
+	ptrdiff_t	i = strlen(basePath);
+	while (i > 0 && basePath[i - 1] != '/' && basePath[i - 1] != '\\' && basePath[i - 1] != ':')
+		i--;
+	if (i > 0)
+		basePath[i] = 0;
+
+	strcpy_s(prgPath, targetPath);
+	i = strlen(prgPath);
+	while (i > 0 && prgPath[i - 1] != '.')
+		i--;
+	if (i > 0)
+		prgPath[i] = 0;
+
+	strcpy_s(mapPath, prgPath);
+	strcpy_s(asmPath, prgPath);
+	strcpy_s(intPath, prgPath);
+
+	strcat_s(mapPath, "error.map");
+	strcat_s(asmPath, "error.asm");
+	strcat_s(intPath, "error.int");
+
+	if (mCompilerOptions & COPT_VERBOSE)
+		printf("Writing <%s>\n", mapPath);
+	mLinker->WriteMapFile(mapPath);
+
+	if (mCompilerOptions & COPT_VERBOSE)
+		printf("Writing <%s>\n", asmPath);
+	mLinker->WriteAsmFile(asmPath, mVersion);
+
+	if (mCompilerOptions & COPT_VERBOSE)
+		printf("Writing <%s>\n", intPath);
+	mInterCodeModule->Disassemble(intPath);
+
+	return true;
+}
+
 bool Compiler::WriteOutputFile(const char* targetPath, DiskImage * d64)
 {
 	char	prgPath[200], mapPath[200], asmPath[200], lblPath[200], intPath[200], bcsPath[200], dbjPath[200];
diff --git a/oscar64/Compiler.h b/oscar64/Compiler.h
index 6ecd3a6..3672991 100644
--- a/oscar64/Compiler.h
+++ b/oscar64/Compiler.h
@@ -48,6 +48,8 @@ public:
 	bool ParseSource(void);
 	bool GenerateCode(void);
 	bool WriteOutputFile(const char* targetPath, DiskImage * d64);
+	bool WriteErrorFile(const char* targetPath);
+	bool RemoveErrorFile(const char* targetPath);
 	int ExecuteCode(bool profile, int trace);
 
 	void AddDefine(const Ident* ident, const char* value);
diff --git a/oscar64/CompilerTypes.h b/oscar64/CompilerTypes.h
index 4c8d206..255c7f9 100644
--- a/oscar64/CompilerTypes.h
+++ b/oscar64/CompilerTypes.h
@@ -39,6 +39,7 @@ static const uint64 COPT_DEBUGINFO = 1ULL << 51;
 
 static const uint64 COPT_CPLUSPLUS = 1ULL << 52;
 static const uint64 COPT_PETSCII = 1ULL << 53;
+static const uint64 COPT_ERROR_FILES = 1ULL << 54;
 
 
 
diff --git a/oscar64/Linker.cpp b/oscar64/Linker.cpp
index eb1c118..1b466b3 100644
--- a/oscar64/Linker.cpp
+++ b/oscar64/Linker.cpp
@@ -1676,15 +1676,18 @@ bool Linker::WriteMapFile(const char* filename)
 
 			if (obj->mFlags & LOBJF_REFERENCED)
 			{
-				if (banked)
+				if (obj->mRegion)
 				{
-					int k = 0;
-					while (k < 64 && !(obj->mRegion->mCartridgeBanks & (1ull << k)))
-						k++;
-					if (k < 64)
-						fprintf(file, "%02x:", k);
-					else
-						fprintf(file, "--:");
+					if (banked)
+					{
+						int k = 0;
+						while (k < 64 && !(obj->mRegion->mCartridgeBanks & (1ull << k)))
+							k++;
+						if (k < 64)
+							fprintf(file, "%02x:", k);
+						else
+							fprintf(file, "--:");
+					}
 				}
 
 				if (obj->mIdent)
@@ -1728,15 +1731,18 @@ bool Linker::WriteMapFile(const char* filename)
 		{
 			const LinkerObject* obj = so[i];
 
-			if (banked)
+			if (obj->mRegion)
 			{
-				int k = 0;
-				while (k < 64 && !(obj->mRegion->mCartridgeBanks & (1ull << k)))
-					k++;
-				if (k < 64)
-					fprintf(file, "%02x:", k);
-				else
-					fprintf(file, "--:");
+				if (banked)
+				{
+					int k = 0;
+					while (k < 64 && !(obj->mRegion->mCartridgeBanks & (1ull << k)))
+						k++;
+					if (k < 64)
+						fprintf(file, "%02x:", k);
+					else
+						fprintf(file, "--:");
+				}
 			}
 
 			fprintf(file, "%04x (%04x) : %s, %s:%s\n", obj->mAddress, obj->mSize, obj->mIdent->mString, LinkerObjectTypeNames[obj->mType], obj->mSection->mIdent->mString);
@@ -1926,7 +1932,9 @@ bool Linker::WriteAsmFile(const char* filename, const char* version)
 					mByteCodeDisassembler.Disassemble(file, mMemory, -1, obj->mAddress, obj->mSize, obj->mProc, obj->mIdent, this);
 					break;
 				case LOT_NATIVE_CODE:
-					if (obj->mRegion->mCartridgeBanks)
+					if (!obj->mRegion)
+						mNativeDisassembler.Disassemble(file, obj->mData, -1, 0, obj->mSize, obj->mProc, obj->mIdent, this, obj->mFullIdent);
+					else if (obj->mRegion->mCartridgeBanks)
 					{
 						int i = 0;
 						while (!(obj->mRegion->mCartridgeBanks & (1ULL << i)))
@@ -1939,7 +1947,9 @@ bool Linker::WriteAsmFile(const char* filename, const char* version)
 						mNativeDisassembler.Disassemble(file, mMemory, -1, obj->mAddress, obj->mSize, obj->mProc, obj->mIdent, this, obj->mFullIdent);
 					break;
 				case LOT_DATA:
-					if (obj->mRegion->mCartridgeBanks)
+					if (!obj->mRegion)
+						mNativeDisassembler.DumpMemory(file, obj->mData, -1, 0, obj->mSize, obj->mProc, obj->mIdent, this, obj);
+					else if (obj->mRegion->mCartridgeBanks)
 					{
 						int i = 0;
 						while (!(obj->mRegion->mCartridgeBanks & (1ULL << i)))
diff --git a/oscar64/oscar64.cpp b/oscar64/oscar64.cpp
index b57a6de..939ff1e 100644
--- a/oscar64/oscar64.cpp
+++ b/oscar64/oscar64.cpp
@@ -312,6 +312,10 @@ int main2(int argc, const char** argv)
 					compiler->mCompilerOptions |= COPT_CPLUSPLUS;
 					compiler->AddDefine(Ident::Unique("__cplusplus"), "1");
 				}
+				else if (arg[1] == 'r' && arg[2] == 'm' && arg[3] == 'p')
+				{
+					compiler->mCompilerOptions |= COPT_ERROR_FILES;
+				}
 				else
 					compiler->mErrors->Error(loc, EERR_COMMAND_LINE, "Invalid command line argument", arg);
 			}
@@ -524,6 +528,8 @@ int main2(int argc, const char** argv)
 				printf("Starting %s %s\n", strProductName, strProductVersion);
 			}
 
+			compiler->WriteErrorFile(targetPath);
+
 			{
 				char dstring[100], tstring[100];
 				time_t now = time(NULL);
@@ -579,6 +585,10 @@ int main2(int argc, const char** argv)
 				if (emulate)
 					compiler->ExecuteCode(profile, trace);
 			}
+			else if (compiler->mCompilerOptions & COPT_ERROR_FILES)
+			{
+				compiler->WriteErrorFile(targetPath);
+			}
 		}
 
 		if (compiler->mErrors->mErrorCount != 0)