6 Sep
2016
6 Sep
'16
11:35 a.m.
On Tue, 6 Sep 2016, Brad H wrote:
My 6800 has been mostly working, but it seems to be
occasionally flaking
out. I don't know why. Sometimes you go to power it up, and there's no
response on terminal side. The 'fix' is sometimes to wiggle the memory/CPU
boards and then for some reason it's fine(ish). There are five cards
fix by wiggling implies a bad connection.
possibly due to oxidation or corrosion of connector?
Depending on how vigorous the wiggling is, it could even be bad connection
between a chip and socket, or even tiny damage to a trace on the board.
Today it flaked again and would not come back up, so I
pulled the MP-M board
and the MP-A board and swapped slots. It came up, but memory at $0100 was
missing. I tried powering up, swapping slots, etc.. same deal. Then I
left the machine for an hour, powered up again.. boom.. now $0100 is back.
Working later could be a thermal problem, or just random chance.