[Coco] 6821 PIA Chip Bad?

[Eric Keppel]

Thank you.  Yes, that is exactly the same situation here.  Different
symptoms when I switch the chips between sockets and when I cool the hot
chip with a small heat sink, it works just fine (except for flaky
graphics) and the machine actually stays running.

I will replace the bad 6821 with a new one and hopefully this beat up
machine will be salvageable to some extent.  The computer was actually
destined to become a wall 'decoration' for my office since it was the
exact model of my very first computer when I was about 7 years old.  16K
Coco 1 with the litte 16K badge and left justified trs-80 label.  Now
this one is too ugly to put on the wall, so I would rather get it
running and at least have some fun with it. :)

Thanks for the advice,
Eric

On Wed, 2011-04-27 at 16:01 -0400, Arthur Flexser wrote:
> I had an almost identical situation years ago with my dad's Commodore-64
> that crashed after a few seconds. Its PIA-equivalent chip was very hot,
> cooling it with some ice in a plastic bag delayed the machine's crashing,
> and swapping the chip with an identical one on the same board changed the
> symptoms of the crash.   A new chip cured it.
> 
> Art
> On Wed, Apr 27, 2011 at 3:38 PM, Steve Batson
> <steve at batsonphotography.com>wrote:
> 
> > Sounds like something is shorted.
> >
> >
> > Steve Batson
> > Batson Photography
> > "Today's Special Moments, Tomorrow's Priceless Treasures"
> >
> > Website: http://www.batsonphotography.com
> > Blog: http://www.batsonphotography.com/blog
> > Our Free Photography Site and Forum:
> > http://www.digitalphotographerzone.com
> >
> >
> >