I/O functions

Functions which perform operations in I/O space. I/O functions include:

Function	Operation
inbyte	8-bit input operation
inhword	16-bit input operation
inword	32-bit input operation
outbyte	8-bit output operation
outhword	16-bit output operation
outword	32-bit output operation
blockinbyte	8-bit input string operation
blockinhword	16-bit input string operation
blockinword	32-bit input string operation
blockoutbyte	8-bit output string operation
blockouthword	16-bit output string operation
blockoutword	32-bit output string operation

#include <rt.h>
BYTE inbyte (WORD port);
WORD inhword (WORD port);
DWORD inword (WORD port);
void outbyte (WORD port, BYTE value);
void outhword (WORD port, WORD value);
void outword (WORD port, DWORD value);
void blockinbyte (WORD port, BYTE *buffer, unsigned int length);
void blockinhword (WORD port, WORD *buffer, unsigned int length);
void blockinword (WORD port, DWORD *buffer, unsigned int length);
void blockoutbyte (WORD port, BYTE *buffer, unsigned int length);
void blockouthword (WORD port, WORD *buffer, unsigned int length);
void blockoutword (WORD port, DWORD *buffer, unsigned int length);

Parameters

port: I/O port address.

value: Data value to write.

buffer: Pointer to data area for block moves.

length: Number of items to move in block move.