Helping LGR to restore a vintage Sanyo ICC-0082 calculator

LGR asked for help rescuing a gorgeous Dictaphone 1680 calculator, née Sanyo ICC-0082. We are happy to oblige. And while we are at it, Ken reverse engineers the enigmatic General Instrument chipset that makes it tick.

LGR's original video: https://youtu.be/Sq_GFKpPhnY

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