AppleWin/source/Z80/z80io.h

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/*** Z80Em: Portable Z80 emulator *******************************************/
/*** ***/
/*** Z80IO.h ***/
/*** ***/
/*** This file contains the prototypes for the functions accessing memory ***/
/*** and I/O ***/
/*** ***/
/*** Copyright (C) Marcel de Kogel 1996,1997 ***/
/*** You are not allowed to distribute this software commercially ***/
/*** Please, notify me, if you make any changes to this file ***/
/****************************************************************************/
/****************************************************************************/
/* Input a byte from given I/O port */
/****************************************************************************/
byte Z80_In (BYTE Port);
/****************************************************************************/
/* Output a byte to given I/O port */
/****************************************************************************/
void Z80_Out (BYTE Port,BYTE Value);
/****************************************************************************/
/* Read a byte from given memory location */
/****************************************************************************/
unsigned Z80_RDMEM(DWORD A);
/****************************************************************************/
/* Write a byte to given memory location */
/****************************************************************************/
void Z80_WRMEM(DWORD A,BYTE V);
/****************************************************************************/
/* Just to show you can actually use macros as well */
/****************************************************************************/
/*
extern byte *ReadPage[256];
extern byte *WritePage[256];
#define Z80_RDMEM(a) ReadPage[(a)>>8][(a)&0xFF]
#define Z80_WRMEM(a,v) WritePage[(a)>>8][(a)&0xFF]=v
*/
/****************************************************************************/
/* Z80_RDOP() is identical to Z80_RDMEM() except it is used for reading */
/* opcodes. In case of system with memory mapped I/O, this function can be */
/* used to greatly speed up emulation */
/****************************************************************************/
#define Z80_RDOP(A) Z80_RDMEM(A)
/****************************************************************************/
/* Z80_RDOP_ARG() is identical to Z80_RDOP() except it is used for reading */
/* opcode arguments. This difference can be used to support systems that */
/* use different encoding mechanisms for opcodes and opcode arguments */
/****************************************************************************/
#define Z80_RDOP_ARG(A) Z80_RDOP(A)
/****************************************************************************/
/* Z80_RDSTACK() is identical to Z80_RDMEM() except it is used for reading */
/* stack variables. In case of system with memory mapped I/O, this function */
/* can be used to slightly speed up emulation */
/****************************************************************************/
#define Z80_RDSTACK(A) Z80_RDMEM(A)
/****************************************************************************/
/* Z80_WRSTACK() is identical to Z80_WRMEM() except it is used for writing */
/* stack variables. In case of system with memory mapped I/O, this function */
/* can be used to slightly speed up emulation */
/****************************************************************************/
#define Z80_WRSTACK(A,V) Z80_WRMEM(A,V)