Hi everyone,
A friend suggested that you guys may be able to help with my Commodore PET. It currently just boots to a junk screen. I used a Romulator to bypass the ROM/RAM and no luck. Then, I swapped out the video RAM with some of the other RAM chips from the board and, while the random characters did change a bit, it still didn't work. I then tested the CPU by swapping in a known-to-be-working 6502, but that did not change anything either. I then tested the reset circuit with a logic probe and it's working fine. I'm unsure of what to try next. I could clean all the chips with deoxit, but I'm wondering what you guys suggest.
Thanks!
Sam
Current Screen Image (file size too large to attach):
A friend suggested that you guys may be able to help with my Commodore PET. It currently just boots to a junk screen. I used a Romulator to bypass the ROM/RAM and no luck. Then, I swapped out the video RAM with some of the other RAM chips from the board and, while the random characters did change a bit, it still didn't work. I then tested the CPU by swapping in a known-to-be-working 6502, but that did not change anything either. I then tested the reset circuit with a logic probe and it's working fine. I'm unsure of what to try next. I could clean all the chips with deoxit, but I'm wondering what you guys suggest.
Thanks!
Sam
Current Screen Image (file size too large to attach):