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Old 25th Feb 2021, 4:22 pm   #668
Join Date: Aug 2011
Location: Newcastle, Tyne and Wear, UK.
Posts: 7,339
Default Re: Non-working Commodore PET 3016

OK, could you capture UD6 pin 20 (scope channel 1) against each of the other data lines DA1-DA7 (Scope channel 2) at the CPU mainboard socket.

Also check the voltage on pin 21 (CS3) of UD6 (should be high ~5V).

Mark, you were the one who originally suggested that scope - do you know if it has any kind of logic analyser capability? It came with an awful lot of test clips, which suggests that it might.
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