On Wed, 11 Dec 2002, Tony Duell wrote:
> > > Chip swapping can only be of use if you _know_ all the chips you're
> > > swapping in are good..
> > Sure, but chances are it will work.
>
> I've not repaired many C64s, but I was under the impression that the
> 82S100 PLA was a common failure. If that's failed in both the 'to be
> repaired' machine and the 'parts' machine, you're not going to get anywhere.
The PLA is the most common chip to fail on a Commodore 64.
The most common thing to fail in the whole C64 setup is the black power
bricks, which are generally considered a piece of garbage.
I'm currently in the process of repairing a SX-64 from a donor C64, and
have managed to get the machine "working" - but there's a break in the
Luma/Chroma lines to the CRT pack.
However the first issue WAS a bad PLA.
Resources I used, aside from a couple C= geeks I know:
ftp://ftp.funet.fi/pub/cbm
In particular, in my case:
ftp://ftp.funet.fi/pub/cbm/documents/repair/troubleshooting-c64.txt
funet.fi has schematics, software, ROM dumps, everything.
JP
Received on Tue Dec 10 2002 - 19:55:00 GMT