Sped up Z80 emulation

7 files changed, 311 insertions, 334 deletions

diff --git a/include/spec.h b/include/spec.h
index 85fb5e7..8171a4f 100644
--- a/include/spec.h
+++ b/include/spec.h
@@ -67,13 +67,9 @@ void	SPECReconfigure(void);
 
 /* Interfaces for the Z80
 */
-Z80Byte	SPECReadMem(Z80 *z80, Z80Word addr);
-void	SPECWriteMem(Z80 *z80, Z80Word addr, Z80Byte val);
 Z80Byte	SPECReadPort(Z80 *z80, Z80Word port);
 void	SPECWritePort(Z80 *z80, Z80Word port, Z80Byte val);
 
-#define	SPECReadDisassem SPECReadMem
-
 /* Interface for snap
 */
 void    SPECWriteMemSNAP(Z80Word addr, Z80Byte val);
diff --git a/include/z80.h b/include/z80.h
index ab095d8..c9bd107 100644
--- a/include/z80.h
+++ b/include/z80.h
@@ -56,20 +56,30 @@ typedef signed char Z80Relative;
 typedef unsigned short Z80Word;
 
 
-/* A Z80 16-bit register.  To access the HI/LO component use the indexes
-   Z80_HI_WORD and Z80_LO_WORD which will be initialised once Z80Init has been
-   called.
+/* A Z80 16-bit register made up of 2 8-bit registers.
 */
+#ifdef Z80_LITTLE_ENDIAN
+typedef struct
+{
+    Z80Byte             lo;
+    Z80Byte             hi;
+} Z80RegPair;
+#endif
+
+#ifdef Z80_BIG_ENDIAN
+typedef struct
+{
+    Z80Byte             hi;
+    Z80Byte             lo;
+} Z80RegPair;
+#endif
+
 typedef union
 {
     Z80Word		w;
-    Z80Byte		b[2];
+    Z80RegPair          b;
 } Z80Reg;
 
-extern int Z80_HI_WORD;
-extern int Z80_LO_WORD;
-
-
 /* The processor
 */
 struct Z80Private;
diff --git a/include/z80_config.h b/include/z80_config.h
index 8d9ee79..2a56cb1 100644
--- a/include/z80_config.h
+++ b/include/z80_config.h
@@ -36,6 +36,11 @@
 */
 #define ENABLE_DISASSEM
 
+/* Pick one of these as appropriate for your real CPU
+#define Z80_BIG_ENDIAN
+*/
+#define Z80_LITTLE_ENDIAN
+
 
 /* Define this to enable the array-based memory model.  In this mode
    an externally visible Z80Byte array called Z80_MEMORY must be
@@ -44,11 +49,11 @@
 
    In this mode the signature of Z80Init changes so that the memory functions
    are not passed.  ALL processor instances share the same memory.
-#define ENABLE_ARRAY_MEMORY
 */
+#define ENABLE_ARRAY_MEMORY
 
 #ifdef ENABLE_ARRAY_MEMORY
-#define RAMBOT 0x0000
+#define RAMBOT 0x4000
 #define RAMTOP 0xffff
 #endif
 
diff --git a/include/z80_private.h b/include/z80_private.h
index e0b3381..a7022d8 100644
--- a/include/z80_private.h
+++ b/include/z80_private.h
@@ -121,13 +121,15 @@ extern Z80Byte	Z80_MEMORY[];
 #define SET(v,b)		(v)|=b
 #define CLR(v,b)		(v)&=~(b)
 
-#define SETFLAG(f)		SET(cpu->AF.b[LO],f)
-#define CLRFLAG(f)		CLR(cpu->AF.b[LO],f)
+#define SETFLAG(f)		SET(cpu->AF.b.lo,f)
+#define CLRFLAG(f)		CLR(cpu->AF.b.lo,f)
 
 #ifdef ENABLE_ARRAY_MEMORY
 
 #define PEEK(addr)		Z80_MEMORY[addr]
 
+/* This can't be a macro as the macro is used as PEEKW(FETCH_WORD)
+*/
 static inline Z80Word PEEKW(Z80Word addr)
 {
     return (PEEK(addr) | (Z80Word)PEEK(addr+1)<<8);
@@ -168,12 +170,12 @@ static inline Z80Word PEEKW(Z80Word addr)
 #endif
 
 
-#define IS_C			(cpu->AF.b[LO]&C_Z80)
-#define IS_N			(cpu->AF.b[LO]&N_Z80)
-#define IS_P			(cpu->AF.b[LO]&P_Z80)
-#define IS_H			(cpu->AF.b[LO]&H_Z80)
-#define IS_Z			(cpu->AF.b[LO]&Z_Z80)
-#define IS_S			(cpu->AF.b[LO]&S_Z80)
+#define IS_C			(cpu->AF.b.lo&C_Z80)
+#define IS_N			(cpu->AF.b.lo&N_Z80)
+#define IS_P			(cpu->AF.b.lo&P_Z80)
+#define IS_H			(cpu->AF.b.lo&H_Z80)
+#define IS_Z			(cpu->AF.b.lo&Z_Z80)
+#define IS_S			(cpu->AF.b.lo&S_Z80)
 
 #define CARRY			IS_C
 
@@ -219,7 +221,7 @@ static inline Z80Word PEEKW(Z80Word addr)
 				    cpu->SP+=2;				\
 				} while(0)
 
-#define SETHIDDEN(res)		cpu->AF.b[LO]=(cpu->AF.b[LO]&~(B3_Z80|B5_Z80))|\
+#define SETHIDDEN(res)		cpu->AF.b.lo=(cpu->AF.b.lo&~(B3_Z80|B5_Z80))|\
 					((res)&(B3_Z80|B5_Z80))
 
 #define CALL			do				\
diff --git a/source/main.c b/source/main.c
index b7d3318..d78a910 100644
--- a/source/main.c
+++ b/source/main.c
@@ -248,11 +248,7 @@ int main(int argc, char *argv[])
 
     FB_Init();
 
-    z80 = Z80Init(SPECReadMem,
-		  SPECWriteMem,
-		  SPECReadPort,
-		  SPECWritePort,
-		  SPECReadDisassem);
+    z80 = Z80Init(SPECReadPort, SPECWritePort);
 
     if (!z80)
     {
diff --git a/source/spec.c b/source/spec.c
index ef132d4..1a5eba2 100644
--- a/source/spec.c
+++ b/source/spec.c
@@ -78,9 +78,9 @@
 #define OFF_X           ((GFX_W-SCR_W)/2)
 #define OFF_Y           ((GFX_H-SCR_H)/2)
 
-#define	ATTR_AT(x,y)	mem[ATTR+(x)+((y)/8)*32]
+#define	ATTR_AT(x,y)	Z80_MEMORY[ATTR+(x)+((y)/8)*32]
 
-Z80Byte			mem[0x10000];
+Z80Byte			Z80_MEMORY[0x10000];
 
 static int              border;
 static int              scanline;
@@ -189,12 +189,12 @@ static void RomPatch(void)
 
     for(f=0;save[f]!=0xff;f++)
     {
-	mem[ROM_SAVE+f]=save[f];
+	Z80_MEMORY[ROM_SAVE+f]=save[f];
     }
 
     for(f=0;load[f]!=0xff;f++)
     {
-	mem[ROM_LOAD+f]=load[f];
+	Z80_MEMORY[ROM_LOAD+f]=load[f];
     }
 }
 
@@ -337,21 +337,21 @@ static int EDCallback(Z80 *z80, Z80Val data)
     switch((Z80Byte)data)
     {
     	case ED_SAVE:
-	    z80->AF.b[Z80_LO_WORD] &= ~eZ80_Carry;
+	    z80->AF.b.lo &= ~eZ80_Carry;
 	    break;
 
     	case ED_LOAD:
-	    if (TAPLoad(z80->AF.b[Z80_HI_WORD],
+	    if (TAPLoad(z80->AF.b.hi,
 			&z80->IX.w,
 			&z80->DE.w,
 			SPECWriteMemSNAP))
 	    {
-		z80->AF.b[Z80_LO_WORD] |= eZ80_Carry;
+		z80->AF.b.lo |= eZ80_Carry;
 		z80->BC.w=0xb001;
 	    }
 	    else
 	    {
-		z80->AF.b[Z80_LO_WORD] &= ~eZ80_Carry;
+		z80->AF.b.lo &= ~eZ80_Carry;
 		z80->BC.w = 0xff01;
 	    }
 	    break;
@@ -379,7 +379,7 @@ void SPECInit(Z80 *z80)
 
     /* Load the ROM
     */
-    memcpy(mem,spec48_bin,ROMLEN);
+    memcpy(Z80_MEMORY,spec48_bin,ROMLEN);
 
     /* Patch the ROM
     */
@@ -429,26 +429,11 @@ void SPECHandleKey(SoftKey key, int is_pressed)
 }
 
 
-Z80Byte SPECReadMem(Z80 *z80, Z80Word addr)
-{
-    return mem[addr];
-}
-
-
-void SPECWriteMem(Z80 *z80, Z80Word addr, Z80Byte val)
-{
-    if (addr>=ROMLEN)
-    {
-	mem[addr]=val;
-    }
-}
-
-
 void SPECWriteMemSNAP(Z80Word addr, Z80Byte val)
 {
     if (addr>=ROMLEN)
     {
-	mem[addr]=val;
+	Z80_MEMORY[addr]=val;
     }
 }
 
@@ -538,7 +523,7 @@ void SPECReset(Z80 *z80)
     r=0;
     for(f=0;f<SCRL;f++)
     {
-    	line[f]=mem+SCRDATA+(c*8*TXT_W)+(r*TXT_W);
+    	line[f]=Z80_MEMORY+SCRDATA+(c*8*TXT_W)+(r*TXT_W);
 
 	c++;
 
@@ -562,9 +547,9 @@ void SPECSaveSnapshot(FILE *fp)
 {
     int f;
 
-    for(f=0; f<sizeof mem; f++)
+    for(f=0; f<sizeof Z80_MEMORY; f++)
     {
-	PUT_Byte(fp, mem[f]);
+	PUT_Byte(fp, Z80_MEMORY[f]);
     }
 
     for(f=0; f<sizeof matrix; f++)
@@ -580,9 +565,9 @@ void SPECLoadSnapshot(FILE *fp)
 {
     int f;
 
-    for(f=0; f<sizeof mem; f++)
+    for(f=0; f<sizeof Z80_MEMORY; f++)
     {
-	mem[f] = GET_Byte(fp);
+	Z80_MEMORY[f] = GET_Byte(fp);
     }
 
     for(f=0; f<sizeof matrix; f++)
diff --git a/source/z80_decode.c b/source/z80_decode.c
index 614f384..f5c7352 100644
--- a/source/z80_decode.c
+++ b/source/z80_decode.c
@@ -36,13 +36,6 @@ static Z80Byte		Ptable[512];
 static Z80Byte		Stable[512];
 static Z80Byte		Ztable[512];
 
-
-int Z80_HI_WORD;
-int Z80_LO_WORD;
-
-#define HI Z80_HI_WORD
-#define LO Z80_LO_WORD
-
 /* ---------------------------------------- MISC FUNCTIONS
 */
 void Z80_InitialiseInternals(void)
@@ -54,17 +47,7 @@ void Z80_InitialiseInternals(void)
     */
     r.w=0x1234;
 
-    if (r.b[0] == 0x12)
-    {
-    	HI=0;
-	LO=1;
-    }
-    else if (r.b[1] == 0x12)
-    {
-    	HI=1;
-	LO=0;
-    }
-    else
+    if (r.b.hi != 0x12 || r.b.lo != 0x34)
     {
     	exit(1);
     }
@@ -150,12 +133,12 @@ do { \
 do { \
     Z80Byte VAL=ONCE; \
     unsigned w; \
-    w=cpu->AF.b[HI]+(unsigned)VAL; \
-    cpu->AF.b[LO]=SZtable[w]; \
-    if ((cpu->AF.b[HI]^w^VAL)&H_Z80) cpu->AF.b[LO]|=H_Z80; \
-    if ((VAL^cpu->AF.b[HI]^0x80)&(VAL^w)&0x80) cpu->AF.b[LO]|=P_Z80; \
+    w=cpu->AF.b.hi+(unsigned)VAL; \
+    cpu->AF.b.lo=SZtable[w]; \
+    if ((cpu->AF.b.hi^w^VAL)&H_Z80) cpu->AF.b.lo|=H_Z80; \
+    if ((VAL^cpu->AF.b.hi^0x80)&(VAL^w)&0x80) cpu->AF.b.lo|=P_Z80; \
     SETHIDDEN(w); \
-    cpu->AF.b[HI]=w; \
+    cpu->AF.b.hi=w; \
 } while(0)
 
 
@@ -163,12 +146,12 @@ do { \
 do { \
     Z80Byte VAL=ONCE; \
     unsigned w; \
-    w=(cpu->AF.b[HI]+(unsigned)VAL+CARRY)&0x1ff; \
-    cpu->AF.b[LO]=SZtable[w]; \
-    if ((cpu->AF.b[HI]^w^VAL)&H_Z80) cpu->AF.b[LO]|=H_Z80; \
-    if ((VAL^cpu->AF.b[HI]^0x80)&(VAL^w)&0x80) cpu->AF.b[LO]|=P_Z80; \
+    w=(cpu->AF.b.hi+(unsigned)VAL+CARRY)&0x1ff; \
+    cpu->AF.b.lo=SZtable[w]; \
+    if ((cpu->AF.b.hi^w^VAL)&H_Z80) cpu->AF.b.lo|=H_Z80; \
+    if ((VAL^cpu->AF.b.hi^0x80)&(VAL^w)&0x80) cpu->AF.b.lo|=P_Z80; \
     SETHIDDEN(w); \
-    cpu->AF.b[HI]=w; \
+    cpu->AF.b.hi=w; \
 } while(0)
 
 
@@ -176,12 +159,12 @@ do { \
 do { \
     Z80Byte VAL=ONCE; \
     unsigned w; \
-    w=(cpu->AF.b[HI]-(unsigned)VAL)&0x1ff; \
-    cpu->AF.b[LO]=SZtable[w]|N_Z80; \
-    if ((cpu->AF.b[HI]^w^VAL)&H_Z80) cpu->AF.b[LO]|=H_Z80; \
-    if ((VAL^cpu->AF.b[HI])&(cpu->AF.b[HI]^w)&0x80) cpu->AF.b[LO]|=P_Z80; \
+    w=(cpu->AF.b.hi-(unsigned)VAL)&0x1ff; \
+    cpu->AF.b.lo=SZtable[w]|N_Z80; \
+    if ((cpu->AF.b.hi^w^VAL)&H_Z80) cpu->AF.b.lo|=H_Z80; \
+    if ((VAL^cpu->AF.b.hi)&(cpu->AF.b.hi^w)&0x80) cpu->AF.b.lo|=P_Z80; \
     SETHIDDEN(w); \
-    cpu->AF.b[HI]=w; \
+    cpu->AF.b.hi=w; \
 } while(0)
 
 
@@ -189,10 +172,10 @@ do { \
 do { \
     Z80Byte VAL=ONCE; \
     unsigned w; \
-    w=(cpu->AF.b[HI]-(unsigned)VAL)&0x1ff; \
-    cpu->AF.b[LO]=SZtable[w]|N_Z80; \
-    if ((cpu->AF.b[HI]^w^VAL)&H_Z80) cpu->AF.b[LO]|=H_Z80; \
-    if ((VAL^cpu->AF.b[HI])&(cpu->AF.b[HI]^w)&0x80) cpu->AF.b[LO]|=P_Z80; \
+    w=(cpu->AF.b.hi-(unsigned)VAL)&0x1ff; \
+    cpu->AF.b.lo=SZtable[w]|N_Z80; \
+    if ((cpu->AF.b.hi^w^VAL)&H_Z80) cpu->AF.b.lo|=H_Z80; \
+    if ((VAL^cpu->AF.b.hi)&(cpu->AF.b.hi^w)&0x80) cpu->AF.b.lo|=P_Z80; \
     SETHIDDEN(VAL); \
 } while(0)
 
@@ -201,12 +184,12 @@ do { \
 do { \
     Z80Byte VAL=ONCE; \
     unsigned w; \
-    w=(cpu->AF.b[HI]-(unsigned)VAL-CARRY)&0x1ff; \
-    cpu->AF.b[LO]=SZtable[w]|N_Z80; \
-    if ((cpu->AF.b[HI]^w^VAL)&H_Z80) cpu->AF.b[LO]|=H_Z80; \
-    if ((VAL^cpu->AF.b[HI])&(cpu->AF.b[HI]^w)&0x80) cpu->AF.b[LO]|=P_Z80; \
+    w=(cpu->AF.b.hi-(unsigned)VAL-CARRY)&0x1ff; \
+    cpu->AF.b.lo=SZtable[w]|N_Z80; \
+    if ((cpu->AF.b.hi^w^VAL)&H_Z80) cpu->AF.b.lo|=H_Z80; \
+    if ((VAL^cpu->AF.b.hi)&(cpu->AF.b.hi^w)&0x80) cpu->AF.b.lo|=P_Z80; \
     SETHIDDEN(w); \
-    cpu->AF.b[HI]=w; \
+    cpu->AF.b.hi=w; \
 } while(0)
 
 
@@ -215,9 +198,9 @@ do { \
     Z80Word VAL=ONCE; \
     Z80Val w; \
     w=(REG)+(Z80Val)VAL; \
-    cpu->AF.b[LO]&=(S_Z80|Z_Z80|V_Z80); \
-    if (w>0xffff) cpu->AF.b[LO]|=C_Z80; \
-    if (((REG)^w^VAL)&0x1000) cpu->AF.b[LO]|=H_Z80; \
+    cpu->AF.b.lo&=(S_Z80|Z_Z80|V_Z80); \
+    if (w>0xffff) cpu->AF.b.lo|=C_Z80; \
+    if (((REG)^w^VAL)&0x1000) cpu->AF.b.lo|=H_Z80; \
     SETHIDDEN(w>>8); \
     (REG)=w; \
 } while(0) 
@@ -228,12 +211,12 @@ do { \
     Z80Word VAL=ONCE; \
     Z80Val w; \
     w=(REG)+(Z80Val)VAL+CARRY; \
-    cpu->AF.b[LO]=0; \
-    if ((w&0xffff)==0) cpu->AF.b[LO]=Z_Z80; \
-    if (w&0x8000) cpu->AF.b[LO]|=S_Z80; \
-    if (w>0xffff) cpu->AF.b[LO]|=C_Z80; \
-    if ((VAL^(REG)^0x8000)&((REG)^w)&0x8000) cpu->AF.b[LO]|=P_Z80; \
-    if (((REG)^w^VAL)&0x1000) cpu->AF.b[LO]|=H_Z80; \
+    cpu->AF.b.lo=0; \
+    if ((w&0xffff)==0) cpu->AF.b.lo=Z_Z80; \
+    if (w&0x8000) cpu->AF.b.lo|=S_Z80; \
+    if (w>0xffff) cpu->AF.b.lo|=C_Z80; \
+    if ((VAL^(REG)^0x8000)&((REG)^w)&0x8000) cpu->AF.b.lo|=P_Z80; \
+    if (((REG)^w^VAL)&0x1000) cpu->AF.b.lo|=H_Z80; \
     SETHIDDEN(w>>8); \
     (REG)=w; \
 } while(0) 
@@ -244,12 +227,12 @@ do { \
     Z80Word VAL=ONCE; \
     Z80Val w; \
     w=(REG)-(Z80Val)VAL-CARRY; \
-    cpu->AF.b[LO]=N_Z80; \
-    if (w&0x8000) cpu->AF.b[LO]|=S_Z80; \
-    if ((w&0xffff)==0) cpu->AF.b[LO]|=Z_Z80; \
-    if (w>0xffff) cpu->AF.b[LO]|=C_Z80; \
-    if ((VAL^(REG))&((REG)^w)&0x8000) cpu->AF.b[LO]|=P_Z80; \
-    if (((REG)^w^VAL)&0x1000) cpu->AF.b[LO]|=H_Z80; \
+    cpu->AF.b.lo=N_Z80; \
+    if (w&0x8000) cpu->AF.b.lo|=S_Z80; \
+    if ((w&0xffff)==0) cpu->AF.b.lo|=Z_Z80; \
+    if (w>0xffff) cpu->AF.b.lo|=C_Z80; \
+    if ((VAL^(REG))&((REG)^w)&0x8000) cpu->AF.b.lo|=P_Z80; \
+    if (((REG)^w^VAL)&0x1000) cpu->AF.b.lo|=H_Z80; \
     SETHIDDEN(w>>8); \
     (REG)=w; \
 } while(0)
@@ -258,19 +241,19 @@ do { \
 #define INC8(REG) \
 do { \
     (REG)++; \
-    cpu->AF.b[LO]=CARRY|SZtable[(REG)]; \
-    if ((REG)==0x80) cpu->AF.b[LO]|=P_Z80; \
-    if (((REG)&0x0f)==0) cpu->AF.b[LO]|=H_Z80; \
+    cpu->AF.b.lo=CARRY|SZtable[(REG)]; \
+    if ((REG)==0x80) cpu->AF.b.lo|=P_Z80; \
+    if (((REG)&0x0f)==0) cpu->AF.b.lo|=H_Z80; \
 } while(0) 
 
 
 #define DEC8(REG) \
 do { \
     (REG)--; \
-    cpu->AF.b[LO]=N_Z80|CARRY; \
-    if ((REG)==0x7f) cpu->AF.b[LO]|=P_Z80; \
-    if (((REG)&0x0f)==0x0f) cpu->AF.b[LO]|=H_Z80; \
-    cpu->AF.b[LO]|=SZtable[(REG)]; \
+    cpu->AF.b.lo=N_Z80|CARRY; \
+    if ((REG)==0x7f) cpu->AF.b.lo|=P_Z80; \
+    if (((REG)&0x0f)==0x0f) cpu->AF.b.lo|=H_Z80; \
+    cpu->AF.b.lo|=SZtable[(REG)]; \
 } while(0)
 
 
@@ -312,9 +295,9 @@ do { \
 */
 #define RRCA \
 do { \
-    cpu->AF.b[LO]=(cpu->AF.b[LO]&(S_Z80|Z_Z80|P_Z80))|(cpu->AF.b[HI]&C_Z80); \
-    cpu->AF.b[HI]=(cpu->AF.b[HI]>>1)|(cpu->AF.b[HI]<<7); \
-    SETHIDDEN(cpu->AF.b[HI]); \
+    cpu->AF.b.lo=(cpu->AF.b.lo&(S_Z80|Z_Z80|P_Z80))|(cpu->AF.b.hi&C_Z80); \
+    cpu->AF.b.hi=(cpu->AF.b.hi>>1)|(cpu->AF.b.hi<<7); \
+    SETHIDDEN(cpu->AF.b.hi); \
 } while(0)
 
 
@@ -322,9 +305,9 @@ do { \
 do { \
     Z80Byte c; \
     c=CARRY; \
-    cpu->AF.b[LO]=(cpu->AF.b[LO]&(S_Z80|Z_Z80|P_Z80))|(cpu->AF.b[HI]&C_Z80); \
-    cpu->AF.b[HI]=(cpu->AF.b[HI]>>1)|(c<<7); \
-    SETHIDDEN(cpu->AF.b[HI]); \
+    cpu->AF.b.lo=(cpu->AF.b.lo&(S_Z80|Z_Z80|P_Z80))|(cpu->AF.b.hi&C_Z80); \
+    cpu->AF.b.hi=(cpu->AF.b.hi>>1)|(c<<7); \
+    SETHIDDEN(cpu->AF.b.hi); \
 } while(0)
 
 
@@ -333,7 +316,7 @@ do { \
     Z80Byte c; \
     c=(REG)&C_Z80; \
     (REG)=((REG)>>1)|((REG)<<7); \
-    cpu->AF.b[LO]=PSZtable[(REG)]|c; \
+    cpu->AF.b.lo=PSZtable[(REG)]|c; \
     SETHIDDEN(REG); \
 } while(0) 
 
@@ -343,16 +326,16 @@ do { \
     Z80Byte c; \
     c=(REG)&C_Z80; \
     (REG)=((REG)>>1)|(CARRY<<7); \
-    cpu->AF.b[LO]=PSZtable[(REG)]|c; \
+    cpu->AF.b.lo=PSZtable[(REG)]|c; \
     SETHIDDEN(REG); \
 } while(0)
 
 
 #define RLCA \
 do { \
-    cpu->AF.b[LO]=(cpu->AF.b[LO]&(S_Z80|Z_Z80|P_Z80))|(cpu->AF.b[HI]>>7); \
-    cpu->AF.b[HI]=(cpu->AF.b[HI]<<1)|(cpu->AF.b[HI]>>7); \
-    SETHIDDEN(cpu->AF.b[HI]); \
+    cpu->AF.b.lo=(cpu->AF.b.lo&(S_Z80|Z_Z80|P_Z80))|(cpu->AF.b.hi>>7); \
+    cpu->AF.b.hi=(cpu->AF.b.hi<<1)|(cpu->AF.b.hi>>7); \
+    SETHIDDEN(cpu->AF.b.hi); \
 } while(0)
 
 
@@ -360,9 +343,9 @@ do { \
 do { \
     Z80Byte c; \
     c=CARRY; \
-    cpu->AF.b[LO]=(cpu->AF.b[LO]&(S_Z80|Z_Z80|P_Z80))|(cpu->AF.b[HI]>>7); \
-    cpu->AF.b[HI]=(cpu->AF.b[HI]<<1)|c; \
-    SETHIDDEN(cpu->AF.b[HI]); \
+    cpu->AF.b.lo=(cpu->AF.b.lo&(S_Z80|Z_Z80|P_Z80))|(cpu->AF.b.hi>>7); \
+    cpu->AF.b.hi=(cpu->AF.b.hi<<1)|c; \
+    SETHIDDEN(cpu->AF.b.hi); \
 } while(0)
 
 
@@ -371,7 +354,7 @@ do { \
     Z80Byte c; \
     c=(REG)>>7; \
     (REG)=((REG)<<1)|c; \
-    cpu->AF.b[LO]=PSZtable[(REG)]|c; \
+    cpu->AF.b.lo=PSZtable[(REG)]|c; \
     SETHIDDEN(REG); \
 } while(0)
 
@@ -381,7 +364,7 @@ do { \
     Z80Byte c; \
     c=(REG)>>7; \
     (REG)=((REG)<<1)|CARRY; \
-    cpu->AF.b[LO]=PSZtable[(REG)]|c; \
+    cpu->AF.b.lo=PSZtable[(REG)]|c; \
     SETHIDDEN(REG); \
 } while(0)
 
@@ -391,7 +374,7 @@ do { \
     Z80Byte c; \
     c=(REG)&C_Z80; \
     (REG)>>=1; \
-    cpu->AF.b[LO]=PSZtable[(REG)]|c; \
+    cpu->AF.b.lo=PSZtable[(REG)]|c; \
     SETHIDDEN(REG); \
 } while(0)
 
@@ -401,7 +384,7 @@ do { \
     Z80Byte c; \
     c=(REG)&C_Z80; \
     (REG)=((REG)>>1)|((REG)&0x80); \
-    cpu->AF.b[LO]=PSZtable[(REG)]|c; \
+    cpu->AF.b.lo=PSZtable[(REG)]|c; \
     SETHIDDEN(REG); \
 } while(0)
 
@@ -411,7 +394,7 @@ do { \
     Z80Byte c; \
     c=(REG)>>7; \
     (REG)=((REG)<<1)|1; \
-    cpu->AF.b[LO]=PSZtable[(REG)]|c; \
+    cpu->AF.b.lo=PSZtable[(REG)]|c; \
     SETHIDDEN(REG); \
 } while(0)
 
@@ -421,7 +404,7 @@ do { \
     Z80Byte c; \
     c=(REG)>>7; \
     (REG)=(REG)<<1; \
-    cpu->AF.b[LO]=PSZtable[(REG)]|c; \
+    cpu->AF.b.lo=PSZtable[(REG)]|c; \
     SETHIDDEN(REG); \
 } while(0)
 
@@ -430,41 +413,41 @@ do { \
 */
 #define AND(VAL) \
 do { \
-    cpu->AF.b[HI]&=VAL; \
-    cpu->AF.b[LO]=PSZtable[cpu->AF.b[HI]]|H_Z80; \
-    SETHIDDEN(cpu->AF.b[HI]); \
+    cpu->AF.b.hi&=VAL; \
+    cpu->AF.b.lo=PSZtable[cpu->AF.b.hi]|H_Z80; \
+    SETHIDDEN(cpu->AF.b.hi); \
 } while(0)
 
 
 #define OR(VAL) \
 do { \
-    cpu->AF.b[HI]|=VAL; \
-    cpu->AF.b[LO]=PSZtable[cpu->AF.b[HI]]; \
-    SETHIDDEN(cpu->AF.b[HI]); \
+    cpu->AF.b.hi|=VAL; \
+    cpu->AF.b.lo=PSZtable[cpu->AF.b.hi]; \
+    SETHIDDEN(cpu->AF.b.hi); \
 } while(0)
 
 
 #define XOR(VAL) \
 do { \
-    cpu->AF.b[HI]^=VAL; \
-    cpu->AF.b[LO]=PSZtable[cpu->AF.b[HI]]; \
-    SETHIDDEN(cpu->AF.b[HI]); \
+    cpu->AF.b.hi^=VAL; \
+    cpu->AF.b.lo=PSZtable[cpu->AF.b.hi]; \
+    SETHIDDEN(cpu->AF.b.hi); \
 } while(0)
 
 
 #define BIT(REG,B) \
 do { \
-    cpu->AF.b[LO]=CARRY|H_Z80; \
+    cpu->AF.b.lo=CARRY|H_Z80; \
     if ((REG)&(1<<B)) \
     { \
-	if (B==7 && (REG&S_Z80)) cpu->AF.b[LO]|=S_Z80; \
-	if (B==5 && (REG&B5_Z80)) cpu->AF.b[LO]|=B5_Z80; \
-	if (B==3 && (REG&B3_Z80)) cpu->AF.b[LO]|=B3_Z80; \
+	if (B==7 && (REG&S_Z80)) cpu->AF.b.lo|=S_Z80; \
+	if (B==5 && (REG&B5_Z80)) cpu->AF.b.lo|=B5_Z80; \
+	if (B==3 && (REG&B3_Z80)) cpu->AF.b.lo|=B3_Z80; \
     } \
     else \
     { \
-	cpu->AF.b[LO]|=Z_Z80; \
-	cpu->AF.b[LO]|=P_Z80; \
+	cpu->AF.b.lo|=Z_Z80; \
+	cpu->AF.b.lo|=P_Z80; \
     } \
 } while(0)
 
@@ -557,7 +540,7 @@ do { \
     else \
 	CLRFLAG(P_Z80); \
  \
-    SETHIDDEN(cpu->AF.b[HI]+b); \
+    SETHIDDEN(cpu->AF.b.hi+b); \
 } while(0)
 
 #define LDD \
@@ -578,7 +561,7 @@ do { \
     else \
 	CLRFLAG(P_Z80); \
  \
-    SETHIDDEN(cpu->AF.b[HI]+b); \
+    SETHIDDEN(cpu->AF.b.hi+b); \
 } while(0)
 
 #define CPI \
@@ -635,13 +618,13 @@ do { \
     b=IN(cpu->BC.w); \
     POKE(cpu->HL.w,b); \
  \
-    cpu->BC.b[HI]--; \
+    cpu->BC.b.hi--; \
     cpu->HL.w++; \
  \
-    cpu->AF.b[LO]=SZtable[cpu->BC.b[HI]]; \
-    SETHIDDEN(cpu->BC.b[HI]); \
+    cpu->AF.b.lo=SZtable[cpu->BC.b.hi]; \
+    SETHIDDEN(cpu->BC.b.hi); \
  \
-    w=(((Z80Word)cpu->BC.b[LO])&0xff)+b; \
+    w=(((Z80Word)cpu->BC.b.lo)&0xff)+b; \
  \
     if (b&0x80) \
     	SETFLAG(N_Z80); \
@@ -666,13 +649,13 @@ do { \
     b=IN(cpu->BC.w); \
     POKE(cpu->HL.w,b); \
  \
-    cpu->BC.b[HI]--; \
+    cpu->BC.b.hi--; \
     cpu->HL.w--; \
  \
-    cpu->AF.b[LO]=SZtable[cpu->BC.b[HI]]; \
-    SETHIDDEN(cpu->BC.b[HI]); \
+    cpu->AF.b.lo=SZtable[cpu->BC.b.hi]; \
+    SETHIDDEN(cpu->BC.b.hi); \
  \
-    w=(((Z80Word)cpu->BC.b[LO])&0xff)+b; \
+    w=(((Z80Word)cpu->BC.b.lo)&0xff)+b; \
  \
     if (b&0x80) \
     	SETFLAG(N_Z80); \
@@ -694,10 +677,10 @@ do { \
     OUT(cpu->BC.w,PEEK(cpu->HL.w)); \
  \
     cpu->HL.w++; \
-    cpu->BC.b[HI]--; \
+    cpu->BC.b.hi--; \
  \
-    cpu->AF.b[LO]=SZtable[cpu->BC.b[HI]]; \
-    SETHIDDEN(cpu->BC.b[HI]); \
+    cpu->AF.b.lo=SZtable[cpu->BC.b.hi]; \
+    SETHIDDEN(cpu->BC.b.hi); \
 } while(0)
 
 #define OUTD \
@@ -705,11 +688,11 @@ do { \
     OUT(cpu->BC.w,PEEK(cpu->HL.w)); \
  \
     cpu->HL.w--; \
-    cpu->BC.b[HI]--; \
+    cpu->BC.b.hi--; \
  \
-    cpu->AF.b[LO]=SZtable[cpu->BC.b[HI]]; \
+    cpu->AF.b.lo=SZtable[cpu->BC.b.hi]; \
     SETFLAG(N_Z80); \
-    SETHIDDEN(cpu->BC.b[HI]); \
+    SETHIDDEN(cpu->BC.b.hi); \
 } while(0)
 
 
@@ -719,22 +702,22 @@ do { \
 #define LD_BLOCK(BASE,DEST,DEST2) \
     case BASE:		/* LD DEST,B */ \
 	TSTATE(4); \
-	DEST=cpu->BC.b[HI]; \
+	DEST=cpu->BC.b.hi; \
 	break; \
  \
     case BASE+1:	/* LD DEST,C */ \
 	TSTATE(4); \
-	DEST=cpu->BC.b[LO]; \
+	DEST=cpu->BC.b.lo; \
 	break; \
  \
     case BASE+2:	/* LD DEST,D */ \
 	TSTATE(4); \
-	DEST=cpu->DE.b[HI]; \
+	DEST=cpu->DE.b.hi; \
 	break; \
  \
     case BASE+3:	/* LD DEST,E */ \
 	TSTATE(4); \
-	DEST=cpu->DE.b[LO]; \
+	DEST=cpu->DE.b.lo; \
 	break; \
  \
     case BASE+4:	/* LD DEST,H */ \
@@ -755,28 +738,28 @@ do { \
  \
     case BASE+7:	/* LD DEST,A */ \
 	TSTATE(4); \
-	DEST=cpu->AF.b[HI]; \
+	DEST=cpu->AF.b.hi; \
 	break;
 
 #define ALU_BLOCK(BASE,OP) \
     case BASE:		/* OP A,B */ \
 	TSTATE(4); \
-	OP(cpu->BC.b[HI]); \
+	OP(cpu->BC.b.hi); \
 	break; \
  \
     case BASE+1:	/* OP A,C */ \
 	TSTATE(4); \
-	OP(cpu->BC.b[LO]); \
+	OP(cpu->BC.b.lo); \
 	break; \
  \
     case BASE+2:	/* OP A,D */ \
 	TSTATE(4); \
-	OP(cpu->DE.b[HI]); \
+	OP(cpu->DE.b.hi); \
 	break; \
  \
     case BASE+3:	/* OP A,E */ \
 	TSTATE(4); \
-	OP(cpu->DE.b[LO]); \
+	OP(cpu->DE.b.lo); \
 	break; \
  \
     case BASE+4:	/* OP A,H */ \
@@ -797,7 +780,7 @@ do { \
  \
     case BASE+7:	/* OP A,A */ \
 	TSTATE(4); \
-	OP(cpu->AF.b[HI]); \
+	OP(cpu->AF.b.hi); \
 	break;
 
 
@@ -807,32 +790,32 @@ do { \
 #define CB_ALU_BLOCK(BASE,OP) \
     case BASE:		/* OP B */ \
 	TSTATE(8); \
-	OP(cpu->BC.b[HI]); \
+	OP(cpu->BC.b.hi); \
 	break; \
  \
     case BASE+1:	/* OP C */ \
 	TSTATE(8); \
-	OP(cpu->BC.b[LO]); \
+	OP(cpu->BC.b.lo); \
 	break; \
  \
     case BASE+2:	/* OP D */ \
 	TSTATE(8); \
-	OP(cpu->DE.b[HI]); \
+	OP(cpu->DE.b.hi); \
 	break; \
  \
     case BASE+3:	/* OP E */ \
 	TSTATE(8); \
-	OP(cpu->DE.b[LO]); \
+	OP(cpu->DE.b.lo); \
 	break; \
  \
     case BASE+4:	/* OP H */ \
 	TSTATE(8); \
-	OP(cpu->HL.b[HI]); \
+	OP(cpu->HL.b.hi); \
 	break; \
  \
     case BASE+5:	/* OP L */ \
 	TSTATE(8); \
-	OP(cpu->HL.b[LO]); \
+	OP(cpu->HL.b.lo); \
 	break; \
  \
     case BASE+6:	/* OP (HL) */ \
@@ -842,38 +825,38 @@ do { \
  \
     case BASE+7:	/* OP A */ \
 	TSTATE(8); \
-	OP(cpu->AF.b[HI]); \
+	OP(cpu->AF.b.hi); \
 	break;
 
 #define CB_BITMANIP_BLOCK(BASE,OP,BIT_NO) \
     case BASE:		/* OP B */ \
 	TSTATE(8); \
-	OP(cpu->BC.b[HI],BIT_NO); \
+	OP(cpu->BC.b.hi,BIT_NO); \
 	break; \
  \
     case BASE+1:	/* OP C */ \
 	TSTATE(8); \
-	OP(cpu->BC.b[LO],BIT_NO); \
+	OP(cpu->BC.b.lo,BIT_NO); \
 	break; \
  \
     case BASE+2:	/* OP D */ \
 	TSTATE(8); \
-	OP(cpu->DE.b[HI],BIT_NO); \
+	OP(cpu->DE.b.hi,BIT_NO); \
 	break; \
  \
     case BASE+3:	/* OP E */ \
 	TSTATE(8); \
-	OP(cpu->DE.b[LO],BIT_NO); \
+	OP(cpu->DE.b.lo,BIT_NO); \
 	break; \
  \
     case BASE+4:	/* OP H */ \
 	TSTATE(8); \
-	OP(cpu->HL.b[HI],BIT_NO); \
+	OP(cpu->HL.b.hi,BIT_NO); \
 	break; \
  \
     case BASE+5:	/* OP L */ \
 	TSTATE(8); \
-	OP(cpu->HL.b[LO],BIT_NO); \
+	OP(cpu->HL.b.lo,BIT_NO); \
 	break; \
  \
     case BASE+6:	/* OP (HL) */ \
@@ -883,7 +866,7 @@ do { \
  \
     case BASE+7:	/* OP A */ \
 	TSTATE(8); \
-	OP(cpu->AF.b[HI],BIT_NO); \
+	OP(cpu->AF.b.hi,BIT_NO); \
 	break;
 
 /* ---------------------------------------- SHIFTED CB OPCODE SHORT-HAND BLOCKS
@@ -892,32 +875,32 @@ do { \
 #define SHIFTED_CB_ALU_BLOCK(BASE,OP) \
     case BASE:		/* OP B */ \
 	TSTATE(8); \
-	OP_ON_MEM_WITH_COPY(OP,addr,cpu->BC.b[HI]); \
+	OP_ON_MEM_WITH_COPY(OP,addr,cpu->BC.b.hi); \
 	break; \
  \
     case BASE+1:	/* OP C */ \
 	TSTATE(8); \
-	OP_ON_MEM_WITH_COPY(OP,addr,cpu->BC.b[LO]); \
+	OP_ON_MEM_WITH_COPY(OP,addr,cpu->BC.b.lo); \
 	break; \
  \
     case BASE+2:	/* OP D */ \
 	TSTATE(8); \
-	OP_ON_MEM_WITH_COPY(OP,addr,cpu->DE.b[HI]); \
+	OP_ON_MEM_WITH_COPY(OP,addr,cpu->DE.b.hi); \
 	break; \
  \
     case BASE+3:	/* OP E */ \
 	TSTATE(8); \
-	OP_ON_MEM_WITH_COPY(OP,addr,cpu->DE.b[LO]); \
+	OP_ON_MEM_WITH_COPY(OP,addr,cpu->DE.b.lo); \
 	break; \
  \
     case BASE+4:	/* OP H */ \
 	TSTATE(8); \
-	OP_ON_MEM_WITH_COPY(OP,addr,cpu->HL.b[HI]); \
+	OP_ON_MEM_WITH_COPY(OP,addr,cpu->HL.b.hi); \
 	break; \
  \
     case BASE+5:	/* OP L */ \
 	TSTATE(8); \
-	OP_ON_MEM_WITH_COPY(OP,addr,cpu->HL.b[LO]); \
+	OP_ON_MEM_WITH_COPY(OP,addr,cpu->HL.b.lo); \
 	break; \
  \
     case BASE+6:	/* OP (HL) */ \
@@ -927,38 +910,38 @@ do { \
  \
     case BASE+7:	/* OP A */ \
 	TSTATE(8); \
-	OP_ON_MEM_WITH_COPY(OP,addr,cpu->AF.b[HI]); \
+	OP_ON_MEM_WITH_COPY(OP,addr,cpu->AF.b.hi); \
 	break;
 
 #define SHIFTED_CB_BITMANIP_BLOCK(BASE,OP,BIT_NO) \
     case BASE:		/* OP B */ \
 	TSTATE(8); \
-	OP_ON_MEM_WITH_ARG_AND_COPY(OP,addr,BIT_NO,cpu->BC.b[HI]); \
+	OP_ON_MEM_WITH_ARG_AND_COPY(OP,addr,BIT_NO,cpu->BC.b.hi); \
 	break; \
  \
     case BASE+1:	/* OP C */ \
 	TSTATE(8); \
-	OP_ON_MEM_WITH_ARG_AND_COPY(OP,addr,BIT_NO,cpu->BC.b[LO]); \
+	OP_ON_MEM_WITH_ARG_AND_COPY(OP,addr,BIT_NO,cpu->BC.b.lo); \
 	break; \
  \
     case BASE+2:	/* OP D */ \
 	TSTATE(8); \
-	OP_ON_MEM_WITH_ARG_AND_COPY(OP,addr,BIT_NO,cpu->DE.b[HI]); \
+	OP_ON_MEM_WITH_ARG_AND_COPY(OP,addr,BIT_NO,cpu->DE.b.hi); \
 	break; \
  \
     case BASE+3:	/* OP E */ \
 	TSTATE(8); \
-	OP_ON_MEM_WITH_ARG_AND_COPY(OP,addr,BIT_NO,cpu->DE.b[LO]); \
+	OP_ON_MEM_WITH_ARG_AND_COPY(OP,addr,BIT_NO,cpu->DE.b.lo); \
 	break; \
  \
     case BASE+4:	/* OP H */ \
 	TSTATE(8); \
-	OP_ON_MEM_WITH_ARG_AND_COPY(OP,addr,BIT_NO,cpu->HL.b[HI]); \
+	OP_ON_MEM_WITH_ARG_AND_COPY(OP,addr,BIT_NO,cpu->HL.b.hi); \
 	break; \
  \
     case BASE+5:	/* OP L */ \
 	TSTATE(8); \
-	OP_ON_MEM_WITH_ARG_AND_COPY(OP,addr,BIT_NO,cpu->HL.b[LO]); \
+	OP_ON_MEM_WITH_ARG_AND_COPY(OP,addr,BIT_NO,cpu->HL.b.lo); \
 	break; \
  \
     case BASE+6:	/* OP (HL) */ \
@@ -968,7 +951,7 @@ do { \
  \
     case BASE+7:	/* OP A */ \
 	TSTATE(8); \
-	OP_ON_MEM_WITH_ARG_AND_COPY(OP,addr,BIT_NO,cpu->AF.b[HI]); \
+	OP_ON_MEM_WITH_ARG_AND_COPY(OP,addr,BIT_NO,cpu->AF.b.hi); \
 	break;
 
 /* ---------------------------------------- DAA
@@ -981,8 +964,8 @@ static void DAA (Z80 *cpu)
 {
     Z80Byte add=0;
     Z80Byte carry=0;
-    Z80Byte nf=cpu->AF.b[LO]&N_Z80;
-    Z80Byte acc=cpu->AF.b[HI];
+    Z80Byte nf=cpu->AF.b.lo&N_Z80;
+    Z80Byte acc=cpu->AF.b.hi;
 
     if (acc>0x99 || IS_C)
     {
@@ -997,18 +980,18 @@ static void DAA (Z80 *cpu)
 
     if (nf)
     {
-    	cpu->AF.b[HI]-=add;
+    	cpu->AF.b.hi-=add;
     }
     else
     {
-    	cpu->AF.b[HI]+=add;
+    	cpu->AF.b.hi+=add;
     }
 
-    cpu->AF.b[LO]=PSZtable[cpu->AF.b[HI]]
+    cpu->AF.b.lo=PSZtable[cpu->AF.b.hi]
 		    | carry
 		    | nf
-		    | ((acc^cpu->AF.b[HI])&H_Z80)
-		    | (cpu->AF.b[HI]&(B3_Z80|B5_Z80));
+		    | ((acc^cpu->AF.b.hi)&H_Z80)
+		    | (cpu->AF.b.hi&(B3_Z80|B5_Z80));
 }
 
 /* ---------------------------------------- HANDLERS FOR ED OPCODES
@@ -1022,20 +1005,20 @@ static void DecodeED(Z80 *cpu, Z80Byte opcode)
 
 	    if (PRIV->pread)
 	    {
-		cpu->BC.b[HI]=PRIV->pread(cpu,cpu->BC.w);
+		cpu->BC.b.hi=PRIV->pread(cpu,cpu->BC.w);
 	    }
 	    else
 	    {
-	    	cpu->BC.b[HI]=0;
+	    	cpu->BC.b.hi=0;
 	    }
 
-	    cpu->AF.b[LO]=CARRY|PSZtable[cpu->BC.b[HI]];
-	    SETHIDDEN(cpu->BC.b[HI]);
+	    cpu->AF.b.lo=CARRY|PSZtable[cpu->BC.b.hi];
+	    SETHIDDEN(cpu->BC.b.hi);
 	    break;
 
 	case 0x41:	/* OUT (C),B */
 	    TSTATE(12);
-	    if (PRIV->pwrite) PRIV->pwrite(cpu,cpu->BC.w,cpu->BC.b[HI]);
+	    if (PRIV->pwrite) PRIV->pwrite(cpu,cpu->BC.w,cpu->BC.b.hi);
 	    break;
 
 	case 0x42:	/* SBC HL,BC */
@@ -1054,8 +1037,8 @@ static void DecodeED(Z80 *cpu, Z80Byte opcode)
 
 	    TSTATE(8);
 
-	    b=cpu->AF.b[HI];
-	    cpu->AF.b[HI]=0;
+	    b=cpu->AF.b.hi;
+	    cpu->AF.b.hi=0;
 	    SUB8(b);
 	    break;
 	    }
@@ -1073,7 +1056,7 @@ static void DecodeED(Z80 *cpu, Z80Byte opcode)
 
 	case 0x47:	/* LD I,A */
 	    TSTATE(9);
-	    cpu->I=cpu->AF.b[HI];
+	    cpu->I=cpu->AF.b.hi;
 	    break;
 
 	case 0x48:	/* IN C,(C) */
@@ -1081,20 +1064,20 @@ static void DecodeED(Z80 *cpu, Z80Byte opcode)
 
 	    if (PRIV->pread)
 	    {
-		cpu->BC.b[LO]=PRIV->pread(cpu,cpu->BC.w);
+		cpu->BC.b.lo=PRIV->pread(cpu,cpu->BC.w);
 	    }
 	    else
 	    {
-	    	cpu->BC.b[LO]=0;
+	    	cpu->BC.b.lo=0;
 	    }
 
-	    cpu->AF.b[LO]=CARRY|PSZtable[cpu->BC.b[LO]];
-	    SETHIDDEN(cpu->BC.b[LO]);
+	    cpu->AF.b.lo=CARRY|PSZtable[cpu->BC.b.lo];
+	    SETHIDDEN(cpu->BC.b.lo);
 	    break;
 
 	case 0x49:	/* OUT (C),C */
 	    TSTATE(12);
-	    if (PRIV->pwrite) PRIV->pwrite(cpu,cpu->BC.w,cpu->BC.b[LO]);
+	    if (PRIV->pwrite) PRIV->pwrite(cpu,cpu->BC.w,cpu->BC.b.lo);
 	    break;
 
 	case 0x4a:	/* ADC HL,BC */
@@ -1113,8 +1096,8 @@ static void DecodeED(Z80 *cpu, Z80Byte opcode)
 
 	    TSTATE(8);
 
-	    b=cpu->AF.b[HI];
-	    cpu->AF.b[HI]=0;
+	    b=cpu->AF.b.hi;
+	    cpu->AF.b.hi=0;
 	    SUB8(b);
 	    break;
 	    }
@@ -1133,7 +1116,7 @@ static void DecodeED(Z80 *cpu, Z80Byte opcode)
 
 	case 0x4f:	/* LD R,A */
 	    TSTATE(9);
-	    cpu->R=cpu->AF.b[HI];
+	    cpu->R=cpu->AF.b.hi;
 	    break;
 
 	case 0x50:	/* IN D,(C) */
@@ -1141,20 +1124,20 @@ static void DecodeED(Z80 *cpu, Z80Byte opcode)
 
 	    if (PRIV->pread)
 	    {
-		cpu->DE.b[HI]=PRIV->pread(cpu,cpu->BC.w);
+		cpu->DE.b.hi=PRIV->pread(cpu,cpu->BC.w);
 	    }
 	    else
 	    {
-	    	cpu->DE.b[HI]=0;
+	    	cpu->DE.b.hi=0;
 	    }
 
-	    cpu->AF.b[LO]=CARRY|PSZtable[cpu->DE.b[HI]];
-	    SETHIDDEN(cpu->BC.b[HI]);
+	    cpu->AF.b.lo=CARRY|PSZtable[cpu->DE.b.hi];
+	    SETHIDDEN(cpu->BC.b.hi);
 	    break;
 
 	case 0x51:	/* OUT (C),D */
 	    TSTATE(12);
-	    if (PRIV->pwrite) PRIV->pwrite(cpu,cpu->BC.w,cpu->DE.b[HI]);
+	    if (PRIV->pwrite) PRIV->pwrite(cpu,cpu->BC.w,cpu->DE.b.hi);
 	    break;
 
 	case 0x52:	/* SBC HL,DE */
@@ -1173,8 +1156,8 @@ static void DecodeED(Z80 *cpu, Z80Byte opcode)
 
 	    TSTATE(8);
 
-	    b=cpu->AF.b[HI];
-	    cpu->AF.b[HI]=0;
+	    b=cpu->AF.b.hi;
+	    cpu->AF.b.hi=0;
 	    SUB8(b);
 	    break;
 	    }
@@ -1192,7 +1175,7 @@ static void DecodeED(Z80 *cpu, Z80Byte opcode)
 
 	case 0x57:	/* LD A,I */
 	    TSTATE(9);
-	    cpu->AF.b[HI]=cpu->I;
+	    cpu->AF.b.hi=cpu->I;
 	    break;
 
 	case 0x58:	/* IN E,(C) */
@@ -1200,20 +1183,20 @@ static void DecodeED(Z80 *cpu, Z80Byte opcode)
 
 	    if (PRIV->pread)
 	    {
-		cpu->DE.b[LO]=PRIV->pread(cpu,cpu->BC.w);
+		cpu->DE.b.lo=PRIV->pread(cpu,cpu->BC.w);
 	    }
 	    else
 	    {
-	    	cpu->BC.b[LO]=0;
+	    	cpu->BC.b.lo=0;
 	    }
 
-	    cpu->AF.b[LO]=CARRY|PSZtable[cpu->DE.b[LO]];
-	    SETHIDDEN(cpu->DE.b[LO]);
+	    cpu->AF.b.lo=CARRY|PSZtable[cpu->DE.b.lo];
+	    SETHIDDEN(cpu->DE.b.lo);
 	    break;
 
 	case 0x59:	/* OUT (C),E */
 	    TSTATE(12);
-	    if (PRIV->pwrite) PRIV->pwrite(cpu,cpu->BC.w,cpu->DE.b[LO]);
+	    if (PRIV->pwrite) PRIV->pwrite(cpu,cpu->BC.w,cpu->DE.b.lo);
 	    break;
 
 	case 0x5a:	/* ADC HL,DE */
@@ -1232,8 +1215,8 @@ static void DecodeED(Z80 *cpu, Z80Byte opcode)
 
 	    TSTATE(8);
 
-	    b=cpu->AF.b[HI];
-	    cpu->AF.b[HI]=0;
+	    b=cpu->AF.b.hi;
+	    cpu->AF.b.hi=0;
 	    SUB8(b);
 	    break;
 	    }
@@ -1251,7 +1234,7 @@ static void DecodeED(Z80 *cpu, Z80Byte opcode)
 
 	case 0x5f:	/* LD A,R */
 	    TSTATE(9);
-	    cpu->AF.b[HI]=cpu->R;
+	    cpu->AF.b.hi=cpu->R;
 	    break;
 
 	case 0x60:	/* IN H,(C) */
@@ -1259,20 +1242,20 @@ static void DecodeED(Z80 *cpu, Z80Byte opcode)
 
 	    if (PRIV->pread)
 	    {
-		cpu->HL.b[HI]=PRIV->pread(cpu,cpu->BC.w);
+		cpu->HL.b.hi=PRIV->pread(cpu,cpu->BC.w);
 	    }
 	    else
 	    {
-	    	cpu->HL.b[HI]=0;
+	    	cpu->HL.b.hi=0;
 	    }
 
-	    cpu->AF.b[LO]=CARRY|PSZtable[cpu->HL.b[HI]];
-	    SETHIDDEN(cpu->HL.b[HI]);
+	    cpu->AF.b.lo=CARRY|PSZtable[cpu->HL.b.hi];
+	    SETHIDDEN(cpu->HL.b.hi);
 	    break;
 
 	case 0x61:	/* OUT (C),H */
 	    TSTATE(12);
-	    if (PRIV->pwrite) PRIV->pwrite(cpu,cpu->BC.w,cpu->HL.b[HI]);
+	    if (PRIV->pwrite) PRIV->pwrite(cpu,cpu->BC.w,cpu->HL.b.hi);
 	    break;
 
 	case 0x62:	/* SBC HL,HL */
@@ -1291,8 +1274,8 @@ static void DecodeED(Z80 *cpu, Z80Byte opcode)
 
 	    TSTATE(8);
 
-	    b=cpu->AF.b[HI];
-	    cpu->AF.b[HI]=0;
+	    b=cpu->AF.b.hi;
+	    cpu->AF.b.hi=0;
 	    SUB8(b);
 	    break;
 	    }
@@ -1316,11 +1299,11 @@ static void DecodeED(Z80 *cpu, Z80Byte opcode)
 
 	    b=PEEK(cpu->HL.w);
 
-	    POKE(cpu->HL.w,(b>>4)|(cpu->AF.b[HI]<<4));
-	    cpu->AF.b[HI]=(cpu->AF.b[HI]&0xf0)|(b&0x0f);
+	    POKE(cpu->HL.w,(b>>4)|(cpu->AF.b.hi<<4));
+	    cpu->AF.b.hi=(cpu->AF.b.hi&0xf0)|(b&0x0f);
 
-	    cpu->AF.b[LO]=CARRY|PSZtable[cpu->AF.b[HI]];
-	    SETHIDDEN(cpu->AF.b[HI]);
+	    cpu->AF.b.lo=CARRY|PSZtable[cpu->AF.b.hi];
+	    SETHIDDEN(cpu->AF.b.hi);
 	    break;
 	    }
 
@@ -1329,20 +1312,20 @@ static void DecodeED(Z80 *cpu, Z80Byte opcode)
 
 	    if (PRIV->pread)
 	    {
-		cpu->HL.b[LO]=PRIV->pread(cpu,cpu->BC.w);
+		cpu->HL.b.lo=PRIV->pread(cpu,cpu->BC.w);
 	    }
 	    else
 	    {
-	    	cpu->HL.b[LO]=0;
+	    	cpu->HL.b.lo=0;
 	    }
 
-	    cpu->AF.b[LO]=CARRY|PSZtable[cpu->HL.b[LO]];
-	    SETHIDDEN(cpu->HL.b[LO]);
+	    cpu->AF.b.lo=CARRY|PSZtable[cpu->HL.b.lo];
+	    SETHIDDEN(cpu->HL.b.lo);
 	    break;
 
 	case 0x69:	/* OUT (C),L */
 	    TSTATE(12);
-	    if (PRIV->pwrite) PRIV->pwrite(cpu,cpu->BC.w,cpu->HL.b[LO]);
+	    if (PRIV->pwrite) PRIV->pwrite(cpu,cpu->BC.w,cpu->HL.b.lo);
 	    break;
 
 	case 0x6a:	/* ADC HL,HL */
@@ -1361,8 +1344,8 @@ static void DecodeED(Z80 *cpu, Z80Byte opcode)
 
 	    TSTATE(8);
 
-	    b=cpu->AF.b[HI];
-	    cpu->AF.b[HI]=0;
+	    b=cpu->AF.b.hi;
+	    cpu->AF.b.hi=0;
 	    SUB8(b);
 	    break;
 	    }
@@ -1386,11 +1369,11 @@ static void DecodeED(Z80 *cpu, Z80Byte opcode)
 
 	    b=PEEK(cpu->HL.w);
 
-	    POKE(cpu->HL.w,(b<<4)|(cpu->AF.b[HI]&0x0f));
-	    cpu->AF.b[HI]=(cpu->AF.b[HI]&0xf0)|(b>>4);
+	    POKE(cpu->HL.w,(b<<4)|(cpu->AF.b.hi&0x0f));
+	    cpu->AF.b.hi=(cpu->AF.b.hi&0xf0)|(b>>4);
 
-	    cpu->AF.b[LO]=CARRY|PSZtable[cpu->AF.b[HI]];
-	    SETHIDDEN(cpu->AF.b[HI]);
+	    cpu->AF.b.lo=CARRY|PSZtable[cpu->AF.b.hi];
+	    SETHIDDEN(cpu->AF.b.hi);
 	    break;
 	    }
 
@@ -1409,7 +1392,7 @@ static void DecodeED(Z80 *cpu, Z80Byte opcode)
 	    	b=0;
 	    }
 
-	    cpu->AF.b[LO]=CARRY|PSZtable[b];
+	    cpu->AF.b.lo=CARRY|PSZtable[b];
 	    SETHIDDEN(b);
 	    break;
 	    }
@@ -1435,8 +1418,8 @@ static void DecodeED(Z80 *cpu, Z80Byte opcode)
 
 	    TSTATE(8);
 
-	    b=cpu->AF.b[HI];
-	    cpu->AF.b[HI]=0;
+	    b=cpu->AF.b.hi;
+	    cpu->AF.b.hi=0;
 	    SUB8(b);
 	    break;
 	    }
@@ -1462,20 +1445,20 @@ static void DecodeED(Z80 *cpu, Z80Byte opcode)
 
 	    if (PRIV->pread)
 	    {
-		cpu->AF.b[HI]=PRIV->pread(cpu,cpu->BC.w);
+		cpu->AF.b.hi=PRIV->pread(cpu,cpu->BC.w);
 	    }
 	    else
 	    {
-	    	cpu->AF.b[HI]=0;
+	    	cpu->AF.b.hi=0;
 	    }
 
-	    cpu->AF.b[LO]=CARRY|PSZtable[cpu->AF.b[HI]];
-	    SETHIDDEN(cpu->AF.b[HI]);
+	    cpu->AF.b.lo=CARRY|PSZtable[cpu->AF.b.hi];
+	    SETHIDDEN(cpu->AF.b.hi);
 	    break;
 
 	case 0x79:	/* OUT (C),A */
 	    TSTATE(12);
-	    if (PRIV->pwrite) PRIV->pwrite(cpu,cpu->BC.w,cpu->AF.b[HI]);
+	    if (PRIV->pwrite) PRIV->pwrite(cpu,cpu->BC.w,cpu->AF.b.hi);
 	    break;
 
 	case 0x7a:	/* ADC HL,SP */
@@ -1494,8 +1477,8 @@ static void DecodeED(Z80 *cpu, Z80Byte opcode)
 
 	    TSTATE(8);
 
-	    b=cpu->AF.b[HI];
-	    cpu->AF.b[HI]=0;
+	    b=cpu->AF.b.hi;
+	    cpu->AF.b.hi=0;
 	    SUB8(b);
 	    break;
 	    }
@@ -1766,18 +1749,18 @@ void Z80_Decode(Z80 *cpu, Z80Byte opcode)
     {
     	case 0xdd:
 	    HL=&(cpu->IX.w);
-	    L=cpu->IX.b+LO;
-	    H=cpu->IX.b+HI;
+	    L=&(cpu->IX.b.lo);
+	    H=&(cpu->IX.b.hi);
 	    break;
     	case 0xfd:
 	    HL=&(cpu->IY.w);
-	    L=cpu->IY.b+LO;
-	    H=cpu->IY.b+HI;
+	    L=&(cpu->IY.b.lo);
+	    H=&(cpu->IY.b.hi);
 	    break;
 	default:
 	    HL=&(cpu->HL.w);
-	    L=cpu->HL.b+LO;
-	    H=cpu->HL.b+HI;
+	    L=&(cpu->HL.b.lo);
+	    H=&(cpu->HL.b.hi);
 	    break;
     }
 
@@ -1794,7 +1777,7 @@ void Z80_Decode(Z80 *cpu, Z80Byte opcode)
 
 	case 0x02:	/* LD (BC),A */
 	    TSTATE(7);
-	    POKE(cpu->BC.w,cpu->AF.b[HI]);
+	    POKE(cpu->BC.w,cpu->AF.b.hi);
 	    break;
 
 	case 0x03:	/* INC BC */
@@ -1804,17 +1787,17 @@ void Z80_Decode(Z80 *cpu, Z80Byte opcode)
 
 	case 0x04:	/* INC B */
 	    TSTATE(4);
-	    INC8(cpu->BC.b[HI]);
+	    INC8(cpu->BC.b.hi);
 	    break;
 
 	case 0x05:	/* DEC B */
 	    TSTATE(4);
-	    DEC8(cpu->BC.b[HI]);
+	    DEC8(cpu->BC.b.hi);
 	    break;
 
 	case 0x06:	/* LD B,n */
 	    TSTATE(7);
-	    cpu->BC.b[HI]=FETCH_BYTE;
+	    cpu->BC.b.hi=FETCH_BYTE;
 	    break;
 
 	case 0x07:	/* RLCA */
@@ -1834,7 +1817,7 @@ void Z80_Decode(Z80 *cpu, Z80Byte opcode)
 
 	case 0x0a:	/* LD A,(BC) */
 	    TSTATE(7);
-	    cpu->AF.b[HI]=PEEK(cpu->BC.w);
+	    cpu->AF.b.hi=PEEK(cpu->BC.w);
 	    break;
 
 	case 0x0b:	/* DEC BC */
@@ -1844,17 +1827,17 @@ void Z80_Decode(Z80 *cpu, Z80Byte opcode)
 
 	case 0x0c:	/* INC C */
 	    TSTATE(4);
-	    INC8(cpu->BC.b[LO]);
+	    INC8(cpu->BC.b.lo);
 	    break;
 
 	case 0x0d:	/* DEC C */
 	    TSTATE(4);
-	    DEC8(cpu->BC.b[LO]);
+	    DEC8(cpu->BC.b.lo);
 	    break;
 
 	case 0x0e:	/* LD C,n */
 	    TSTATE(7);
-	    cpu->BC.b[LO]=FETCH_BYTE;
+	    cpu->BC.b.lo=FETCH_BYTE;
 	    break;
 
 	case 0x0f:	/* RRCA */
@@ -1863,7 +1846,7 @@ void Z80_Decode(Z80 *cpu, Z80Byte opcode)
 	    break;
 
 	case 0x10:	/* DJNZ */
-	    if (--(cpu->BC.b[HI]))
+	    if (--(cpu->BC.b.hi))
 	    {
 		TSTATE(13);
 		JR;
@@ -1882,7 +1865,7 @@ void Z80_Decode(Z80 *cpu, Z80Byte opcode)
 
 	case 0x12:	/* LD (DE),A */
 	    TSTATE(7);
-	    POKE(cpu->DE.w,cpu->AF.b[HI]);
+	    POKE(cpu->DE.w,cpu->AF.b.hi);
 	    break;
 
 	case 0x13:	/* INC DE */
@@ -1892,17 +1875,17 @@ void Z80_Decode(Z80 *cpu, Z80Byte opcode)
 
 	case 0x14:	/* INC D */
 	    TSTATE(4);
-	    INC8(cpu->DE.b[HI]);
+	    INC8(cpu->DE.b.hi);
 	    break;
 
 	case 0x15:	/* DEC D */
 	    TSTATE(4);
-	    DEC8(cpu->DE.b[HI]);
+	    DEC8(cpu->DE.b.hi);
 	    break;
 
 	case 0x16:	/* LD D,n */
 	    TSTATE(7);
-	    cpu->DE.b[HI]=FETCH_BYTE;
+	    cpu->DE.b.hi=FETCH_BYTE;
 	    break;
 
 	case 0x17:	/* RLA */
@@ -1922,7 +1905,7 @@ void Z80_Decode(Z80 *cpu, Z80Byte opcode)
 
 	case 0x1a:	/* LD A,(DE) */
 	    TSTATE(7);
-	    cpu->AF.b[HI]=PEEK(cpu->DE.w);
+	    cpu->AF.b.hi=PEEK(cpu->DE.w);
 	    break;
 
 	case 0x1b:	/* DEC DE */
@@ -1932,17 +1915,17 @@ void Z80_Decode(Z80 *cpu, Z80Byte opcode)
 
 	case 0x1c:	/* INC E */
 	    TSTATE(4);
-	    INC8(cpu->DE.b[LO]);
+	    INC8(cpu->DE.b.lo);
 	    break;
 
 	case 0x1d:	/* DEC E */
 	    TSTATE(4);
-	    DEC8(cpu->DE.b[LO]);
+	    DEC8(cpu->DE.b.lo);
 	    break;
 
 	case 0x1e:	/* LD E,n */
 	    TSTATE(7);
-	    cpu->DE.b[LO]=FETCH_BYTE;
+	    cpu->DE.b.lo=FETCH_BYTE;
 	    break;
 
 	case 0x1f:	/* RRA */
@@ -2025,10 +2008,10 @@ void Z80_Decode(Z80 *cpu, Z80Byte opcode)
 
 	case 0x2f:	/* CPL */
 	    TSTATE(4);
-	    cpu->AF.b[HI]^=0xff;
+	    cpu->AF.b.hi^=0xff;
 	    SETFLAG(H_Z80);
 	    SETFLAG(N_Z80);
-	    SETHIDDEN(cpu->AF.b[HI]);
+	    SETHIDDEN(cpu->AF.b.hi);
 	    break;
 
 	case 0x30:	/* JR NC,d */
@@ -2042,7 +2025,7 @@ void Z80_Decode(Z80 *cpu, Z80Byte opcode)
 
 	case 0x32:	/* LD (nnnn),A */
 	    TSTATE(13);
-	    POKE(FETCH_WORD,cpu->AF.b[HI]);
+	    POKE(FETCH_WORD,cpu->AF.b.hi);
 	    break;
 
 	case 0x33:	/* INC SP */
@@ -2070,9 +2053,9 @@ void Z80_Decode(Z80 *cpu, Z80Byte opcode)
 
 	case 0x37:	/* SCF */
 	    TSTATE(4);
-	    cpu->AF.b[LO]=(cpu->AF.b[LO]&(S_Z80|Z_Z80|P_Z80))
+	    cpu->AF.b.lo=(cpu->AF.b.lo&(S_Z80|Z_Z80|P_Z80))
 			  | C_Z80
-			  | (cpu->AF.b[HI]&(B3_Z80|B5_Z80));
+			  | (cpu->AF.b.hi&(B3_Z80|B5_Z80));
 	    break;
 
 	case 0x38:	/* JR C,d */
@@ -2086,7 +2069,7 @@ void Z80_Decode(Z80 *cpu, Z80Byte opcode)
 
 	case 0x3a:	/* LD A,(nnnn) */
 	    TSTATE(13);
-	    cpu->AF.b[HI]=PEEK(FETCH_WORD);
+	    cpu->AF.b.hi=PEEK(FETCH_WORD);
 	    break;
 
 	case 0x3b:	/* DEC SP */
@@ -2096,17 +2079,17 @@ void Z80_Decode(Z80 *cpu, Z80Byte opcode)
 
 	case 0x3c:	/* INC A */
 	    TSTATE(4);
-	    INC8(cpu->AF.b[HI]);
+	    INC8(cpu->AF.b.hi);
 	    break;
 
 	case 0x3d:	/* DEC A */
 	    TSTATE(4);
-	    DEC8(cpu->AF.b[HI]);
+	    DEC8(cpu->AF.b.hi);
 	    break;
 
 	case 0x3e:	/* LD A,n */
 	    TSTATE(7);
-	    cpu->AF.b[HI]=FETCH_BYTE;
+	    cpu->AF.b.hi=FETCH_BYTE;
 	    break;
 
 	case 0x3f:	/* CCF */
@@ -2117,51 +2100,51 @@ void Z80_Decode(Z80 *cpu, Z80Byte opcode)
 	    else
 	    	CLRFLAG(H_Z80);
 
-	    cpu->AF.b[LO]^=C_Z80;
-	    SETHIDDEN(cpu->AF.b[HI]);
+	    cpu->AF.b.lo^=C_Z80;
+	    SETHIDDEN(cpu->AF.b.hi);
 	    break;
 
-	LD_BLOCK(0x40,cpu->BC.b[HI],cpu->BC.b[HI])
-	LD_BLOCK(0x48,cpu->BC.b[LO],cpu->BC.b[LO])
-	LD_BLOCK(0x50,cpu->DE.b[HI],cpu->DE.b[HI])
-	LD_BLOCK(0x58,cpu->DE.b[LO],cpu->DE.b[LO])
-	LD_BLOCK(0x60,*H,cpu->HL.b[HI])
-	LD_BLOCK(0x68,*L,cpu->HL.b[LO])
+	LD_BLOCK(0x40,cpu->BC.b.hi,cpu->BC.b.hi)
+	LD_BLOCK(0x48,cpu->BC.b.lo,cpu->BC.b.lo)
+	LD_BLOCK(0x50,cpu->DE.b.hi,cpu->DE.b.hi)
+	LD_BLOCK(0x58,cpu->DE.b.lo,cpu->DE.b.lo)
+	LD_BLOCK(0x60,*H,cpu->HL.b.hi)
+	LD_BLOCK(0x68,*L,cpu->HL.b.lo)
 
 	case 0x70:	/* LD (HL),B */
 	    TSTATE(7);
 	    OFFSET(off);
-	    POKE(*HL+off,cpu->BC.b[HI]);
+	    POKE(*HL+off,cpu->BC.b.hi);
 	    break;
 
 	case 0x71:	/* LD (HL),C */
 	    TSTATE(7);
 	    OFFSET(off);
-	    POKE(*HL+off,cpu->BC.b[LO]);
+	    POKE(*HL+off,cpu->BC.b.lo);
 	    break;
 
 	case 0x72:	/* LD (HL),D */
 	    TSTATE(7);
 	    OFFSET(off);
-	    POKE(*HL+off,cpu->DE.b[HI]);
+	    POKE(*HL+off,cpu->DE.b.hi);
 	    break;
 
 	case 0x73:	/* LD (HL),E */
 	    TSTATE(7);
 	    OFFSET(off);
-	    POKE(*HL+off,cpu->DE.b[LO]);
+	    POKE(*HL+off,cpu->DE.b.lo);
 	    break;
 
 	case 0x74:	/* LD (HL),H */
 	    TSTATE(7);
 	    OFFSET(off);
-	    POKE(*HL+off,cpu->HL.b[HI]);
+	    POKE(*HL+off,cpu->HL.b.hi);
 	    break;
 
 	case 0x75:	/* LD (HL),L */
 	    TSTATE(7);
 	    OFFSET(off);
-	    POKE(*HL+off,cpu->HL.b[LO]);
+	    POKE(*HL+off,cpu->HL.b.lo);
 	    break;
 
 	case 0x76:	/* HALT */
@@ -2177,10 +2160,10 @@ void Z80_Decode(Z80 *cpu, Z80Byte opcode)
 	case 0x77:	/* LD (HL),A */
 	    TSTATE(7);
 	    OFFSET(off);
-	    POKE(*HL+off,cpu->AF.b[HI]);
+	    POKE(*HL+off,cpu->AF.b.hi);
 	    break;
 
-	LD_BLOCK(0x78,cpu->AF.b[HI],cpu->AF.b[HI])
+	LD_BLOCK(0x78,cpu->AF.b.hi,cpu->AF.b.hi)
 
 	ALU_BLOCK(0x80,ADD8)
 	ALU_BLOCK(0x88,ADC8)
@@ -2294,8 +2277,8 @@ void Z80_Decode(Z80 *cpu, Z80Byte opcode)
 		Z80Word port;
 
 		port=FETCH_BYTE;
-		port|=(Z80Word)cpu->AF.b[HI]<<8;
-	    	PRIV->pwrite(cpu,port,cpu->AF.b[HI]);
+		port|=(Z80Word)cpu->AF.b.hi<<8;
+	    	PRIV->pwrite(cpu,port,cpu->AF.b.hi);
 	    }
 	    else
 	    	cpu->PC++;
@@ -2341,8 +2324,8 @@ void Z80_Decode(Z80 *cpu, Z80Byte opcode)
 		Z80Word port;
 
 		port=FETCH_BYTE;
-		port|=(Z80Word)cpu->AF.b[HI]<<8;
-		cpu->AF.b[HI]=PRIV->pread(cpu,port);
+		port|=(Z80Word)cpu->AF.b.hi<<8;
+		cpu->AF.b.hi=PRIV->pread(cpu,port);
 	    }
 	    else
 	    	cpu->PC++;