4 Nov
2016
4 Nov
'16
12:56 p.m.
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.
-tony