This board handles most of the front panel switching: COMPUTE, RESET and the like. Six push buttons, two are on / off toggles (FAST and ERROR HOLD), the remainder are radio button style in that you push one in and the others metaphorically pop out. Defaults to RESET on power up. In hindsight perhaps an overly ambitious amount of circuitry to fit on one (160 x 100 mm) board (13 chips, 14 transistors and nineteen diodes!). But it works!! Despite looking like the insides of a 1970s super Jap radio.
I'll put up the actual circuit diagrams for this stuff as I go along. Just need to draw it out first...
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