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Old 11th Jul 2019, 6:35 am   #155
NealCrook
Triode
 
Join Date: May 2019
Location: Reading, Berkshire, UK.
Posts: 39
Default Re: Gemini 80-Bus System

This is puzzling. With the board powered down I suggest buzzing out the pin to look for a short to power/gnd and to look for a short on adjacent pins of the cpu or crtc.

Next step in desperation is to bend the cpu pin (about 45 degrees) so that you can insert it without it touching the socket pin then probe it like that. If it doesn't toggle then I might admit to being extremely puzzled.

(I am away on vacation and I didn't pack the schematics so that's my best guess for now)

Neal
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