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PCHWIO.C
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C/C++ Source or Header
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1997-07-05
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73 lines
/* +++Date last modified: 05-Jul-1997 */
/*
** PCHWIO.C - SNIPPETS portable hardware I/O access under DOS
**
** public domain by Bob Stout
*/
#include "pchwio.h"
#include "mk_fp.h"
#if defined(__ZTC__) && !defined(__SC__)
void FAR * getvect(unsigned intnum)
{
unsigned seg, off;
int_getvector(intnum, &off, &seg);
return MK_FP(seg, off);
}
void setvect(unsigned intnum, void (INTERRUPT FAR *handler)())
{
unsigned seg = FP_SEG(handler), off = FP_OFF(handler);
int_setvector(intnum, off, seg);
}
#endif /* ZTC getvect(), setvect() */
#if defined(_MSC_VER) || defined(__WATCOMC__) || \
defined(__ZTC__) || defined(__SC__)
#if !defined(MK_FP)
#define MK_FP(seg,off) ((void far *)(((long)(seg) << 16)|(unsigned)(off)))
#endif
unsigned char Peekb(unsigned seg, unsigned ofs)
{
unsigned char FAR *ptr;
ptr = MK_FP(seg, ofs);
return *ptr;
}
unsigned short Peekw(unsigned seg, unsigned ofs)
{
unsigned FAR *ptr;
ptr = MK_FP(seg, ofs);
return *ptr;
}
void Pokeb(unsigned seg, unsigned ofs, unsigned char ch)
{
unsigned char FAR *ptr;
ptr = MK_FP(seg, ofs);
*ptr = ch;
}
void Pokew(unsigned seg, unsigned ofs, unsigned short num)
{
unsigned FAR *ptr;
ptr = MK_FP(seg, ofs);
*ptr = num;
}
#endif /* MSC/ZTC/WC Peek(), poke() */