Commodore VIC-20

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Commodore VIC-20
Branding Commodore
Manufacturer Mitsumi (keyboard)
Keycaps Spherical double-shot
Interface Integrated

Keyboards

At least three different types of keyboard have been discovered.

PET-derived Mitsumi hybrid

This appears to be the original keyboard, using the guide shaft plate, sliders and keystem adapters from a PET keyboard (like that of the Commodore 8032-SK), but a revised keyboard matrix. The shift lock switch is likely to be Futaba lock the same as in the later keyboards. Black tape covers up the unused holes for switch positions not used.[1][2]

Discrete rubber domes

Found in a 1983 Revision D VIC-20, from below this has the same general design as the later keyboard (and that of the Commodore 64), but instead of using "hybrid" switches, it has sliders over discrete rubber domes that appear to be glued to the PCB. The shift lock switch is still Futaba lock.[3]

Mitsumi hybrid

This has an identical arrangement to the Commodore 64, with cruciform mount conductive foot Mitsumi hybrid switches, and a non-keyboard switch for shift lock.[4]

References

  1. The Future was 8bit — Silver VIC20
  2. Tynemouth Software — Commodore 4032 Editor ROM for Business keyboard
  3. The Liberator — Commodore VIC-20 Disassembled
  4. Oldcomputr.com — Cleaning the keyboard of a VIC 20