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

SiriusHardware · 5th Apr 2021, 9:03 pm

While we ponder the mysteries of what's going on with the RAM, I wonder if we can ask yet another favour of Slothie, which is:

Slothie: Could you make us a bit of code (or a modified version of your existing code) which just tries, repeatedly, to write AA to Ram location 0000, attempts to read it, writes 55 to location 0000, attempts to read it, just that, over and over again?

We need this so that we can properly see what's happening with the RAM read / writes, system RAM chip selects (RAS / CAS etc), plus the data passing (or maybe not passing) through the buffers.

If you would be kind enough to do that, I'll pop it into another EPROM and whizz it up to Colin.

5th Apr 2021, 9:03 pm	#1363
SiriusHardware Dekatron Join Date: Aug 2011 Location: Newcastle, Tyne and Wear, UK. Posts: 11,556	Re: Non-working Commodore PET 3016 While we ponder the mysteries of what's going on with the RAM, I wonder if we can ask yet another favour of Slothie, which is: Slothie: Could you make us a bit of code (or a modified version of your existing code) which just tries, repeatedly, to write AA to Ram location 0000, attempts to read it, writes 55 to location 0000, attempts to read it, just that, over and over again? We need this so that we can properly see what's happening with the RAM read / writes, system RAM chip selects (RAS / CAS etc), plus the data passing (or maybe not passing) through the buffers. If you would be kind enough to do that, I'll pop it into another EPROM and whizz it up to Colin.