7 Oct
2005
7 Oct
'05
2:25 p.m.
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."
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