kyeakel
Experienced Member
I just bought a PET 4016 for $5.00, it came with a 2031 disk drive and 2 cassette tape drives. The unit powers up and displays the basic 4.0 and ready prompt. The only keys that work are the period, equals, and the run/stop. I've removed the keyboard and cleaned it, no improvement. I've scoped out the 6520 outputs to the bcd to decimal chaip and it is scanning. When a key is pressed I can see the wave form on the outputs of the decoder. I'm leaning tword replacing the 6520. Anyone have similar keyboard issues and resolve them?
Kipp
Kipp