3 ms·
MS-DOS kinda expects the timer interrupt to only fire at around 18.2hz I think so it's too coarse for millisecond delays.
by 0x0 7y ago
MS-DOS kinda expects the timer interrupt to only fire at around 18.2hz I think so it's too coarse for millisecond delays.
- mailslot 7y agoI always assumed it was 16hz. Oh well. That was a long time ago.
- bonzini 7y agoYou can read the timer's countdown counter instead of relying solely on the tick; it runs at 1.2 MHz approximately.
- rasz 7y agoms dos compatible != IBM PC compatible. 80186 based PC will still run TP programs, despite Timer0 being mapped to port 30-36H instead of 40-43H, not to mention totally non 8253 compatible.