I was reminded of this by the recent post about "the Keyset". I read a review of one of these devices in a magazine ("Interface Age?" Byte?) back in the early days of microcomputers. It was a keyboard replacement that allowed the user to enter any ASCII code using binary chords. It had a button for each finger and eight for the thumb; if I remember correctly, the thumb buttons were effectively rocker switches. Set the four high bits with the thumb switches, enter characters via the four low bits entered with the finger buttons.
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[ 1.3 ms ] story [ 17.2 ms ] threadSomehow it didn't catch on.