ard at p850ug1.demon.co.uk
Fri Nov 4 14:56:10 CDT 2016
> Crashed after a while, and only shows 128K (512k is populated),
It appears that there's a DIP shunt block on the CPU board where each shunt
corespond to a row of DRAMs. You should check all 4 positions are shorted.
I think that the power-on test checks the first 128K RAM, then sees if the top
location (? first location) of the next 128K works if so, it tests that RAM, and
repeats 128K at a time to work out how much RAM it has. So you may have
defective RAMs in the second 128K.
I wonder if the crashing is due to RAM problems in the first 128K.
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