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KBK update for Sunday, 6th October

At the same time that Bitsavers uploaded the Electronic Engineer magazine keyboard guide, they also uploaded two Cherry data entry keyboard brochures from 1971, which are now the oldest documents to date on Cherry keyboards. These documents offer two very interesting findings:

  1. It was already known that Cherry filed a reed switch patent in 1970. These Cherry reed switches are now confirmed from official documentation. Only two models are known: 201-0100 (SPST-NO) and 202-0100 (DPST-NO).
  2. The documents also confirm that Cherry M6 started off with different part numbers. UncleFan already found a Cherry sample card demonstrating this, and this too is now confirmed from official literature. The reed switches were assigned 20x codes, while the gold crosspoint switches were assigned 26x codes, where x denotes the number of poles. Within two years, the “2” would change to “M” for the gold crosspoint switches, and the reed switches would disappear.

View within the updates for 2019

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