KBK update for Sunday, 28th July

Micro Switch PB8* keyboard switches are starting to make sense now. The difference between 1PB877 and 1PB878 (as found in Univac keyboards) is now clear: the former is one-shot and the latter is continuous. This exactly corresponds to the use of pulse and level switches in SW and SD Hall effect keyboards. While some PB types are electronically one-shot using an attached PCB, one-shot PB8* keyboard switches mechanically release the internal microswitch immediately after operation. The reason is not known, but it may be the same as with the Hall effect keyboards: a way to achieve N-key rollover.

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