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Old 25th Feb 2021, 4:10 pm   #667
ScottishColin
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Join Date: May 2012
Location: Perth, Scotland
Posts: 695
Default Re: Non-working Commodore PET 3016

No - I went lower and tried to hit the pin of the socket soldered to the motherboard.

Colin.

Quote:
Originally Posted by SiriusHardware View Post
Can I just check - when we say look at DA0 (etc) at the CPU socket we mean on the pins of the socket which is soldered into the PCB - not the one the CPU is plugged into on top.

If you were looking at DA0 on the CPU itself then it would be understandable to see a constant low bit '0', as that bit is low in the NOP opcode (EA = 1110 1010).
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