Hi!

A "super cap" may not last long in 1985 circuitry.

Dunno. I've got a Fisher tuner based on a Toshiba chipset (a 4-bit
microcontroller with integrated memory and a separate display driver)
that uses a supercap to keep the memory running.

It's been unplugged for weeks at a time between uses and somehow keeps
the stations memorized. I'm guessing the Toshiba microcontroller is
kept just barely alive, perhaps only a refresh current is applied to
the internal memory?

William