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

Mark1960 · 5th Feb 2021, 4:57 am

The 6502 doesn’t need to receive correct instructions to show activity, it just needs to not receive the kil instructions due to the corruption.

I think the pin 10 of the buffer lack of ground is important to investigate. Then after that try again to measure the data bus on each side of the buffer.

I think this needs to be done before worrying about verifying the proms, which might require an eprom programmer or building an eprom reader.

5th Feb 2021, 4:57 am	#484
Mark1960 Octode Join Date: Mar 2020 Location: Kitchener, Ontario, Canada Posts: 1,294	Re: Non-working Commodore PET 3016 The 6502 doesn’t need to receive correct instructions to show activity, it just needs to not receive the kil instructions due to the corruption. I think the pin 10 of the buffer lack of ground is important to investigate. Then after that try again to measure the data bus on each side of the buffer. I think this needs to be done before worrying about verifying the proms, which might require an eprom programmer or building an eprom reader.