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

Timbucus · 31st Jan 2021, 7:26 pm

It also goes to a chip on the same sheet related to Chip Select - so actually that is driving 6 chips - I counted the ROMs' as 1 really which was silly.

We could really do with a scope of a similar arrangement on a working PET to understand what they look like - we know for example on the MK14 that stuff does not go fully low... whereas on my Triton I know the other sides of the Buffers are truly down at zero.

I am only half paying attention at the moment - do we know where the pullup for BA10 comes from?

31st Jan 2021, 7:26 pm	#409
Timbucus Octode Join Date: Mar 2019 Location: Barry, Vale of Glamorgan, Wales, UK. Posts: 1,364	Re: Non-working Commodore PET 3016 It also goes to a chip on the same sheet related to Chip Select - so actually that is driving 6 chips - I counted the ROMs' as 1 really which was silly. We could really do with a scope of a similar arrangement on a working PET to understand what they look like - we know for example on the MK14 that stuff does not go fully low... whereas on my Triton I know the other sides of the Buffers are truly down at zero. I am only half paying attention at the moment - do we know where the pullup for BA10 comes from?