testbios and the system timer
rminnich at lanl.gov
Thu Jun 3 15:40:00 CEST 2004
On Thu, 3 Jun 2004, Richard Smith wrote:
> This will only skip the jump (and do the BX decrement) if ax is zero.
> For ax to be zero the result of the 2's complement subtraction must be
> zero or the when the 2 reads are the same number. But I just don't see
> how this would happen repeatably at .6us per ISA IO.
All I know is BIOS code sucks and it looks like VGA BIOS code is worse
than BIOS code. IT's amazing that any of it ever worked at all.
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