UK Vintage Radio Repair and Restoration Discussion Forum - View Single Post - Non-working Commodore PET 3016

SiriusHardware · 11th Mar 2021, 9:37 pm

Are you really sure there is no R/W signal on UA10 pin 4? Because the input to UA3 13->12 comes from UA10 pin 4, and you say you do have a signal on UA3 pin 12.

Regarding there only being R/W activity for a second or so, can you check the CPU A0 pin (9) to see if the CPU is still running continually, or if it is stopping after a second or so.

11th Mar 2021, 9:37 pm	#949
SiriusHardware Dekatron Join Date: Aug 2011 Location: Newcastle, Tyne and Wear, UK. Posts: 11,560	Re: Non-working Commodore PET 3016 Are you really sure there is no R/W signal on UA10 pin 4? Because the input to UA3 13->12 comes from UA10 pin 4, and you say you do have a signal on UA3 pin 12. Regarding there only being R/W activity for a second or so, can you check the CPU A0 pin (9) to see if the CPU is still running continually, or if it is stopping after a second or so. Last edited by SiriusHardware; 11th Mar 2021 at 9:44 pm.