From: Spiro Trikaliotis (ml-cbmhackers_at_trikaliotis.net)
Date: 2004-05-03 18:41:14
Hello Steve,
* On Mon, May 03, 2004 at 09:33:39AM -0600 Steve Judd wrote:
> 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?)
I don't really understand what you mean.
The 6522/6526 timers are counters which count PHI2 pulses. I need to
count my own, "custom" pulses. Possibly, I could feed PHI2 with the
clock I need to count, but I'm not sure.
If the counter should count up or down depends on the status of another
input line. The is, whenever a clock pulse comes in, the states of the
other line determines if this clock pulse is meant to increment or
decrement the counter. I need the absolute value afterwards.
Unfortunately, I don't exactly understand what you suggest.
Kind regards,
Spiro.
--
Spiro R. Trikaliotis
http://www.trikaliotis.net/
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