home
***
CD-ROM
|
disk
|
FTP
|
other
***
search
/
PsL Monthly 1993 December
/
PSL Monthly Shareware CD-ROM (December 1993).iso
/
prgmming
/
dos
/
c
/
pcpilot.exe
/
lha
/
KBD.C
< prev
next >
Wrap
Text File
|
1989-02-18
|
2KB
|
58 lines
/* ------------------------------------------------------------------------ */
/* KBD.C */
/* */
/* See pg. 79 of Systems Programming In Turbo C */
/* */
/* ------------------------------------------------------------------------ */
#pragma inline /* notify compiler of inline assembly language */
#include <dos.h>
#include "kbd.h"
void KbdFlush()
/*
This function flushes the keyboard buffer maintained by the BIOS
*/
{
a01:;
asm mov ah, 01; /* BIOS service 1: determine if key is ready */
asm int 16h; /* BIOS keyboard services */
asm jz a02; /* ZF = 1 means no key ready */
asm mov ah, 00; /* BIOS service 0: read key */
asm int 16h;
asm jmp a01; /* return for another key */
a02:;
}
int KbdGetShift()
/*
This function returns the BIOS shift status word
*/
{
return *((int far *)0x00400017);
}
void KbdSetShift(int ShiftStat)
/*
This function sets the BIOS shift status word
*/
{
*((int far *)0x00400017) = ShiftStat;
}
int KbdGetC()
/*
This function reads a key using the BIOS. The return value contains:
High-order byte: Extended code
Low-order byte: ASCII value
*/
{
_AH = 0; /* BIOS service 0: read keyboard */
geninterrupt (0x16); /* BIOS keyboard services */
return (_AX); /* Extended code/ASCII value returned in AH/AL */
}