From: Steve Judd (sjudd_at_ffd2.com)
Date: 2004-05-03 17:33:39
Hola Spiro,
On Mon, 3 May 2004, Spiro Trikaliotis wrote:
>
> Yes, but it's more work than using an existing chip for this. If only
> the 6522/6526 would have counters instead of timers.
Forgive the intrusion of this thorough hardware ignoramus, but... why
can't you couple a 6522/26 to a logic inverter, i.e. use the inverter when
you want to count up, and don't use it when you want to count down? (A
2's complement thingie would be better if they exist, but I figure an
inverter is close enough?)
Again, the above is asked out of ignorance.
-S
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