KBK update for Sunday, 4th July

Tentatively, the second production two-of-N encoded keyboard outside of Micro Switch has been identified: Bendix Flight Systems Division’s NASA control panel. With four binary encoders, double-pole switches with separately-wired poles and no matrix co-ordinate processing, it seems most likely that this is a two-of-N arrangement. This is also the first ever confirmed production mechanical two-of-N keyboard, although Maxi-Switch certainly designed such a keyboard.

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