[Coco] CoCo 2 with Random Characters on Screen at Power Up

[Danny Amborn]

On Sun, 26 Jan 2014 21:45:38 -0500, Arthur Flexser <flexser at fiu.edu>
wrote:

>I would now try putting the 6847 back into your previously working CoCo and
>seeing if it still functions okay.  It sounds possible that the bad CoCo
>may be damaging 6847s that were previously okay.  This is particularly
>possible if you tried the previously working 6847 in the bad computer
>while that computer still had the bad 6809 in it.  Or you had the bad 6809
>swapped into the good computer and the presence of the bad 6809 maybe
>damaged its 6847 when you turned that computer on.  You may now need to
>order one 6809 and two 6847s to put things right, if I'm surmising
>correctly that the bad 6809 may be a 6847-killer.
>
>Art


I was actually worried about that too so I did put the 6847 back into
the original computer and it works like a charm.  I also took the CPU
that I originally dropped into the non-working computer, a 6309, into
the working computer and it also works just fine.  At least in the
short time I had those chips in there it hasn't damaged them.

--

Dan Amborn
slackware64 at embarqmail.com