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

SiriusHardware · 5th Mar 2021, 8:50 pm

Most of those outputs may be subject to / enabled by the states of the [PULLUP_2], [BA13 / BA14] and [NEXT] lines all of which come from off-sheet.

If we all agree that UH6 appears dead, it might save time to order

3 x 74LS107 (UH6, UH7, UH8)
1 x 74LS93 (UH9)
2x 74LS08 (UH10, UF1)
1 x 74LS74 (UG9)

Subject to their all being cheap enough, that is. At least they are all common 'LS' and not 'plain original' TTL.

If you just want to go slow and steady, then it certainly looks as though UH6 is dead, so I think you are going to have to replace that.

5th Mar 2021, 8:50 pm	#807
SiriusHardware Dekatron Join Date: Aug 2011 Location: Newcastle, Tyne and Wear, UK. Posts: 11,560	Re: Non-working Commodore PET 3016 Most of those outputs may be subject to / enabled by the states of the [PULLUP_2], [BA13 / BA14] and [NEXT] lines all of which come from off-sheet. If we all agree that UH6 appears dead, it might save time to order 3 x 74LS107 (UH6, UH7, UH8) 1 x 74LS93 (UH9) 2x 74LS08 (UH10, UF1) 1 x 74LS74 (UG9) Subject to their all being cheap enough, that is. At least they are all common 'LS' and not 'plain original' TTL. If you just want to go slow and steady, then it certainly looks as though UH6 is dead, so I think you are going to have to replace that. Last edited by SiriusHardware; 5th Mar 2021 at 9:01 pm.