If it has been sitting for a while, reseat all the chips on each board,
and then reseat all the boards. You can start by minimizing the number
of boards in the system, try just the boot, memory and cpu boards, and
see if the error goes away or changes.
Chips do go bad, but many a time it has been oxidation on the pins of
the DIP that go into the socket that makes a mess.
Joe Heck
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