testbios and the system timer

[Richard Smith]

ron minnich wrote:

> 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.
> 

Hold up.  I'm baked.  Gotta get more sleep.  The above is obviously 
wrong.  Its should be when they differ by 2.