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Old 18th Feb 2021, 8:49 pm   #603
SiriusHardware
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Join Date: Aug 2011
Location: Newcastle, Tyne and Wear, UK.
Posts: 6,743
Default Re: Non-working Commodore PET 3016

Duh, sorry, I meant UB3 and UC3, as you have probably guessed.

We may have to look at changing UE9 / UE10 next - same part, same age, similar function to the not very healthy ones which were being used as UB3 / UC3. Let's see if anyone wants to try something else first.

Although you could try scoping on both sides of the data buffers as you did with the address buffers it would be more difficult to draw a conclusion from what you find because the CPU will not keep running unless you disconnect some of the data bus pins.
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