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