View Full Version : PET 4016 troubleshooting

August 30th, 2009, 01:55 PM
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?


August 30th, 2009, 02:27 PM
Just ordered the rubber keyboard repair kit noted in another PET repair thread. I might try that first.


August 30th, 2009, 06:41 PM
I have a few NOS keyboards for sale on my web site. They're retail price, but they're guaranteed to work.

August 31st, 2009, 01:52 PM
BD, what does NOS mean?

August 31st, 2009, 03:10 PM
I have a few "NOS" (New Old Stock) keyboards, still in the original plastic and cardboard supports from the shipping case. Never used. I bought them from an old Commodore dealer. I have used two myself to restore a 4016 and a 2001-N16, but I still have two or three left.