testbios and the system timer

Richard Smith rsmith at bitworks.com
Thu Jun 3 16:01:01 CEST 2004

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.

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