This is an old post, preserved for reference.
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This is the first in a series of articles covering a project involving a Commodore PET. This PET has quite a life story, this first part covers how I what I did with it 10-12 years ago. The next articles will cover recent developments. Here it is, as it was in 2009 (ignore what's on the screen, more on that later).
Next, the keyboard. The PET has an 8x10 keyboard matrix, and the chosen motherboard had the old 5 pin DIN keyboard connector (AT style). I adapted an old PC keyboard to drive this matrix, with an adapter board to interface between the 20 pin Pet keyboard and the PC Keyboard controller board. It was a partial success, as the matrix was different, so I needed to remap them in software at the PC side. Some weren't mapped by the controller at the keyboard end, so weren't sent through, but most of the keys worked.
next week's thrilling instalment of The Pet Project!
Update: This Pet has now been fully restored
2022 Update: This PET still sits on my desk, although it now has a Mini PET 40/80D board installed.