Brilliant! Indeed it is a bad ram chip. I replaced all the RAM on bank 0 & 1, and my XT is alive again! Thanks a lot chris_nh for your suggestion. I...
Hi Chuck(G), finally found the problem. Previously I have been using the Sequential Run button when programming, which first erase, then blank check,...
I checked cabling to the host are all good. I also checked the clock line directly on the keyboard socket of the XT motherboard, and it is the same,...
I didn't get to trace down all the bad capacitors after replacing 2 bad ones, the resistance increase from 15ohm to 21ohm. The open trace on pin 2 of...
Today I did more comparison between the 2 motherboard by doing continuity test of the components. Something strange I found, with both board without...
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