ID Number: Q40359
5.x 6.00 6.00a 6.00ax 7.00
MS-DOS
Summary:
The following code illustrates how to turn the SCROLL LOCK key on in
your program. Note: This code is only for use with MS-DOS. Running it
with OS/2 will cause a protection violation. Use the OS/2 FAPI
function KbdSetStatus() to set the status of shift flags when writing
programs that will run with OS/2 or be bound to run with both MS-DOS
and OS/2.
Sample Code
-----------
/* Compile options needed: none
*/
#include <stdio.h>
main()
{
/* Get the address of the keyboard status byte */
char far *kbdstat = (char far *) 0x00000417;
char scrollmask = 0x10;
/* OR *kbdstat with scrollmask to set bit 4 in the
keyboard status byte to 1 */
*kbdstat = *kbdstat | scrollmask;
}
Additional information on keyboard status can be found in the Peter
Norton "Programmer's Guide to the IBM PC and PS/2." The above
information also applies to QuickC.
Additional reference words: 5.00 5.10 6.00 6.00a 6.00ax 5.0 5.1 6.0
6.0a 6.0ax 7.00 7.0