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My public cryptographic key

Member of

Kabarett Störfall

Green Party, Lerthe

NABU Burgdorf, Lehrte, Uetze

Swing Low Gospel Chiore of Markus Parish, Lehrte

Society for the Preservation of Classic Computers

PET Care: Key Issues

Ingredients of a successful PET keyboard repair: an eraser and isopropanol

It was somewhat annoying that even after the PET's successful repair many keys didn't work properly or even not at all. This could be resolved by applying an incredible and incredibly simple, yet proven procedure, involving both an eraser and some alcohol (like isopropanol).

Disassembly

Removing and disassembling the keyboard turned out to be rather simple (at least in comparison to the Sharp MZ-80A's keyboard) -- iff one is lucky enough to find a 1/4 inch spanner in a metric workshop... Also, one must bring oneself to desolder or even cut the two wires connected to the [SHIFT LOCK] key.

Commodore PET with opened "engine lid" — The PET with its "engine lid" opened

Commodore PET keyboard at its original location — The keyboard at its original location

Removed Commodore PET keyboard, top view — Removed, top view

Removed Commodore PET keyboard, bottom view — Removed, bottom view

Disassembled Commodore PET keyboard — Disassembled -- both the contact plates on the PCB and the black thingies underneath the keys required cleaning with the eraser and isopropanol

Commodore PET keyboard, SHIFT-LOCK key with lustre terminal — The SHIFT LOCK wires were "repaired" using a lustre terminal

Back on duty

Commodore PET: Screenshot of the game "Pernix", from Andreas Dripke's "CBM-Spiele-Buch" (= "CBM games book")

With all number pad keys back in working condition, games like Pernix (sort of Simon says on steroids) are fun to play again!