6502 CPU schematics

[Roy J. Tellason]

On Friday 07 March 2008 15:29, Philip Belben wrote:
> Roy J. Tellason wrote:
> > I have a bunch of 65xx parts on hand,  if anybody is looking for some...
>
> Well, I'm short of a 6520 PIA!  Have you any of those left?  If so,
> please contact me off list.
>
> When I was 13 (1980.  Ouch!) I was given a PET for my birthday.  A few
> years later I blew up an output buffer in one of the 6520s trying to use
> the Cassette 2 motor output as a controlled power supply.  We connected
> one of those two-tone doobells that uses the back emf from the "ding"
> solenoid when you open the switch to sound the "dong".  Said back emf
> killed the output buffer on that pin of the 6520.  It managed to do so
> without any noticeable damage to the intervening circuitry, too!
>
> I have other PETs, but (a) I want to preserve my "original" one and (b)
> it goes against the grain to scavenge chips from another working system.
>   My PET is useable, but I have to swap the 6520s around depending on
> what I/O function I need...

Them I don't seem to show in my list,  though I have lots of 6522 and 6526.  
Maybe I'll do some digging and see if I can't find one someplace,  but so far 
it's not looking good...

-- 
Member of the toughest, meanest, deadliest, most unrelenting -- and
ablest -- form of life in this section of space,  a critter that can
be killed but can't be tamed.  --Robert A. Heinlein, "The Puppet Masters"
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Information is more dangerous than cannon to a society ruled by lies. --James 
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