It could be caused by bus contention, which
may also be the cause of the
resetting. Possibly some of the decode logic has failed, and is allowing
two
devices to drive the data bus at the same time.
I've seen this before,
and it
does cause spikes on the 5V rails.
That is interesting, I hadn't considered that. Given that it gets a fair way
into the boot sequence it would have to be an intermittent failure.
I?d be interested in putting my diagnostic ROM on that just to see what it throws up. In
the absence of having it in front of me so I can do that is the ROM socketed? You can
easily burn your own if so.
?
Adrian/Witchy
Binary Dinosaurs - Celebrating Computing History from 1972 onwards
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