testbios and the system timer

[ron minnich]

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.

ron