Re: 1978 Commodore PET project
The keyboard is just a matrix of switches, all the electronics is on the main PCB. Therefore briefly connecting a wire betweem a 'row' pin and a 'column' pin on the keyboard connector will simulate pressing a key. I am sure the electrical layout of the keys is in some available documentation.
However you do of course require a working main PCB for this to be useful. So that video fault needs fixing first.
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