Great disassembly job. There's yet another branch of the rabbit hole that Tom almost fell down:
... the multiplier is based on a classic form,
having a translinear core, supported by three
(X, Y, and Z) linearized voltage-to-current
converters, and the load driving output amplifier.
I have no clue how the thing works!
The 'translinear' school of design was founded (or at least popularized) by Barrie Gilbert at Analog Devices (https://en.wikipedia.org/wiki/Translinear_circuit , https://en.wikipedia.org/wiki/Barrie_Gilbert ). Gilbert was one of the undisputed GOATs in the analog field and a full-fledged Renaissance man in his own right. It's worth reading more about him if/when you have the time and inclination.
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