KIM-1 repair advice wanted

[Eric J Korpela]

At http://www.6502.org/oldmicro/buildkim/buildkim.htm you can find
schematics of the original KIM and one that can be built with a 6532. There
might be enough info there in order to replace the 6530 with a 6532+EPROM
daughter board.

On 10/6/05, Cameron Kaiser <spectre at floodgap.com> wrote:
>
> > Well, one of the supposedly-working exhibits is my KIM-1, but it died
> > this afternoon. I can't get it to do more than occasionally display a
> > single zero, on the leftmost 7-segment display. A cursory look with a
> > logic probe (and no docs to hand) shows the clock is running and at
> > least a few address lines are too. I bet it's a memory fault.
> >
> > What are the common faults? I'm hoping it's one of the 2102 RAMs,
> > because I stand a chance of having a suitable replacement. However, I
> > fear it's more likely a 6530, and I assume they're unobtanium. Has
> > anyone ever come up with a kludge to effectively use a 6532 (and are
> > they any easier to find?) with an EPROM? Or anything else?
>
> 6532s are definitely not pin-compatible, and I've never seen any means of
> converting them or integrating an EPROM for the mask ROM component. My own
> KIM-1 is a little flaky and after awhile will do something similar, but
> usually only after it's been running for some time or if there was a power
> fault (and RS usually sets it right).
>
> You could try replacing the RAM, but I don't think that explains your
> symptoms.
>
> --
> ---------------------------------- personal:
> http://www.armory.com/~spectre/ --
> Cameron Kaiser, Floodgap Systems Ltd * So. Calif., USA *
> ckaiser at floodgap.com
> -- "I'd love to go out with you, but my personalities each need therapy."
> -----
>