diff --git a/src/burn/burnint.h b/src/burn/burnint.h
index 9d8e333b7..a86956c5d 100644
--- a/src/burn/burnint.h
+++ b/src/burn/burnint.h
@@ -8,6 +8,11 @@
 #include <assert.h>
 
 #include "tchar.h"
+
+// ---------------------------------------------------------------------------
+#define LSB_FIRST
+// ---------------------------------------------------------------------------
+
 #include "burn.h"
 
 // ---------------------------------------------------------------------------
@@ -19,6 +24,7 @@
 // zet.cpp
 #include "zet.h"
 
+#ifdef LSB_FIRST
 typedef union
 {
 	struct { UINT8 l,h,h2,h3; } b;
@@ -26,6 +32,15 @@ typedef union
 	UINT32 d;
 } PAIR;
 
+#define BURN_ENDIAN_SWAP_INT8(x)				x
+#define BURN_ENDIAN_SWAP_INT16(x)				x
+#define BURN_ENDIAN_SWAP_INT32(x)				x
+#define BURN_ENDIAN_SWAP_INT64(x)				x
+#else
+// define the above union and BURN_ENDIAN_SWAP macros in the following platform specific header
+#include "endian.h"
+#endif
+
 // ---------------------------------------------------------------------------
 // Driver information
 
diff --git a/src/cpu/sh2/sh2.cpp b/src/cpu/sh2/sh2.cpp
index a4aa0923c..3e507bc2f 100644
--- a/src/cpu/sh2/sh2.cpp
+++ b/src/cpu/sh2/sh2.cpp
@@ -579,7 +579,11 @@ void program_write_dword_32be(unsigned int /*A*/, unsigned int /*V*/)
 
 #if FAST_OP_FETCH
 
+#ifdef LSB_FIRST
 #define cpu_readop16(A)	*(unsigned short *)(pSh2Ext->opbase + ((A) ^ 0x02))
+#else
+#define cpu_readop16(A)	(*(unsigned short *)(pSh2Ext->opbase + ((A))))
+#endif
 
 #else
 
@@ -588,7 +592,9 @@ SH2_INLINE unsigned short cpu_readop16(unsigned int A)
 	unsigned char * pr;
 	pr = pSh2Ext->MemMap[ (A >> SH2_SHIFT) + SH2_WADD * 2 ];
 	if ( (unsigned int)pr >= SH2_MAXHANDLER ) {
+#ifdef LSB_FIRST
 		A ^= 2;
+#endif
 		return *((unsigned short *)(pr + (A & SH2_PAGEM)));
 	}
 	return pSh2Ext->ReadWord[(unsigned int)pr](A);
@@ -608,7 +614,9 @@ SH2_INLINE UINT8 RB(UINT32 A)
 	unsigned char * pr;
 	pr = pSh2Ext->MemMap[ A >> SH2_SHIFT ];
 	if ( (uintptr_t)pr >= SH2_MAXHANDLER ) {
+#ifdef LSB_FIRST
 		A ^= 3;
+#endif
 		return pr[A & SH2_PAGEM];
 	}
 	return pSh2Ext->ReadByte[(uintptr_t)pr](A);
@@ -624,7 +632,9 @@ SH2_INLINE UINT16 RW(UINT32 A)
 	unsigned char * pr;
 	pr = pSh2Ext->MemMap[ A >> SH2_SHIFT ];
 	if ( (uintptr_t)pr >= SH2_MAXHANDLER ) {
+#ifdef LSB_FIRST
 		A ^= 2;
+#endif
 		//return (pr[A & SH2_PAGEM] << 8) | pr[(A & SH2_PAGEM) + 1];
 		return *((unsigned short *)(pr + (A & SH2_PAGEM)));
 	}
@@ -637,7 +647,9 @@ SH2_INLINE UINT16 OPRW(UINT32 A)
 	unsigned char * pr;
 	pr = pSh2Ext->MemMap[ (A >> SH2_SHIFT) + SH2_WADD * 2 ];
 	if ( (uintptr_t)pr >= SH2_MAXHANDLER ) {
+#ifdef LSB_FIRST
 		A ^= 2;
+#endif
 		return *((unsigned short *)(pr + (A & SH2_PAGEM)));
 	}
 	
@@ -670,7 +682,9 @@ SH2_INLINE void WB(UINT32 A, UINT8 V)
 	unsigned char* pr;
 	pr = pSh2Ext->MemMap[(A >> SH2_SHIFT) + SH2_WADD];
 	if ((uintptr_t)pr >= SH2_MAXHANDLER) {
+#ifdef LSB_FIRST
 		A ^= 3;
+#endif
 		pr[A & SH2_PAGEM] = (unsigned char)V;
 		return;
 	}
@@ -687,7 +701,9 @@ SH2_INLINE void WW(UINT32 A, UINT16 V)
 	unsigned char * pr;
 	pr = pSh2Ext->MemMap[(A >> SH2_SHIFT) + SH2_WADD];
 	if ((uintptr_t)pr >= SH2_MAXHANDLER) {
+#ifdef LSB_FIRST
 		A ^= 2;
+#endif
 		*((unsigned short *)(pr + (A & SH2_PAGEM))) = (unsigned short)V;
 		return;
 	}
diff --git a/src/cpu/z80/z80.h b/src/cpu/z80/z80.h
index b6345c040..d45a84eeb 100644
--- a/src/cpu/z80/z80.h
+++ b/src/cpu/z80/z80.h
@@ -8,8 +8,13 @@
 
 typedef union
 {
+#ifdef LSB_FIRST
 	struct { UINT8 l,h,h2,h3; } b;
 	struct { UINT16 l,h; } w;
+#else
+	struct { UINT8 h3,h2,h,l; } b;
+	struct { UINT16 h,l; } w;
+#endif
 	UINT32 d;
 } Z80_PAIR;