layout	title	permalink
page	Q12131: Use Timer Interrupt to Maintain Time Independent of CPU Speed	/pubs/pc/reference/microsoft/kb/Q12131/

Q12131: Use Timer Interrupt to Maintain Time Independent of CPU Speed

Article: Q12131
Version(s): 3.00 4.00 5.00 5.10 6.00 6.00a
Operating System: MS-DOS
Flags: ENDUSER | s_quickc
Last Modified: 15-JAN-1991

Question:

Is there a way to set up a function that will pause for n units of
time without being altered on a faster or slower machine (for example,
from a PC to an AT).

Response:

Set up a routine to handle the timer tick interrupt. This will be the
same on all machines (about 18.2 times per second with interrupts
enabled). The timer tick is interrupt 1C and can be modified for
access by your own routine.