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SiriusHardware · 11th Feb 2020, 11:15 am

OK, in that case can you try as suggested earlier, use your meter on its '200' Ohms range to find out which of the main board keyboard connector pins is pin 1?

It should be whichever pin is directly connected, ie, zero Ohms, to pin 1 of the 74LS145.

11th Feb 2020, 11:15 am	#74
SiriusHardware Dekatron Join Date: Aug 2011 Location: Newcastle, Tyne and Wear, UK. Posts: 11,586	Re: Commodore PET 3016 OK, in that case can you try as suggested earlier, use your meter on its '200' Ohms range to find out which of the main board keyboard connector pins is pin 1? It should be whichever pin is directly connected, ie, zero Ohms, to pin 1 of the 74LS145.