This is an old post, preserved for reference.
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Following on from the repair work on my Commodore PET 4032 earlier in the year, I've got a few more PET board repairs coming up. This first one is from a blog reader in the States.
8032-SK), this one is 80 column only.
ROM / RAM replacement board to bypass the onboard RAM and ROM chips. Optimistically connecting a keyboard and the video to the 4032 monitor via an extension lead.
10 print chr$(142)
20 print chr$(205.5+RND(1));
30 GOTO 20
This just generates a random maze from / and \ graphics characters (line 10 puts it into graphics mode).
converted the board in my 4032 back to 40 columns.
Revial Studios do work, but just use the left hand side of the screen. Still very playable and Down is quite addictive. All in the name of testing of course.