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/*
this header file can be used to implement your own external devices for
emu8086 - 8086 microprocessor emulator.
devices can be written in borland turbo c, visual c++
(for visual basic use io.bas instead).
supported input / output addresses:
0 to 65535 (0x0 - 0xFFFF)
most recent version of emu8086 is required,
check this url for the latest version:
http://www.emu8086.com
you don't need to understand the code of this
module, just include this file (io.h) into your
project, and use these functions:
unsigned char READ_IO_BYTE(long lPORT_NUM)
short int READ_IO_WORD(long lPORT_NUM)
void WRITE_IO_BYTE(long lPORT_NUM, unsigned char uValue)
void WRITE_IO_WORD(long lPORT_NUM, short int iValue)
where:
lPORT_NUM - is a number in range: from 0 to 65535.
uValue - unsigned byte value to be written to a port.
iValue - signed word value to be written to a port.
*/
const char sIO_FILE[] = "C:\emu8086.io";
unsigned char READ_IO_BYTE(long lPORT_NUM)
{
unsigned char tb;
char buf[500];
unsigned int ch;
strcpy(buf, sIO_FILE);
FILE *fp;
fp = fopen(buf,"r+");
// Read byte from port:
fseek(fp, lPORT_NUM, SEEK_SET);
ch = fgetc(fp);
fclose(fp);
tb = ch;
return tb;
}
short int READ_IO_WORD(long lPORT_NUM)
{
short int ti;
unsigned char tb1;
unsigned char tb2;
tb1 = READ_IO_BYTE(lPORT_NUM);
tb2 = READ_IO_BYTE(lPORT_NUM + 1);
// Convert 2 bytes to a 16 bit word:
ti = tb2;
ti = ti << 8;
ti = ti + tb1;
return ti;
}
void WRITE_IO_BYTE(long lPORT_NUM, unsigned char uValue)
{
char buf[500];
unsigned int ch;
strcpy(buf, sIO_FILE);
FILE *fp;
fp = fopen(buf,"r+");
ch = uValue;
// Write byte to port:
fseek(fp, lPORT_NUM, SEEK_SET);
fputc(ch, fp);
fclose(fp);
}
void WRITE_IO_WORD(long lPORT_NUM, short int iValue)
{
WRITE_IO_BYTE (lPORT_NUM, iValue & 0x00FF);
WRITE_IO_BYTE (lPORT_NUM + 1, (iValue & 0xFF00) >> 8);
}
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