It looks like marco has it.
https://www.marcospecialties.com/pinball-parts/5432-12726-00
(Topic ID: 327130)
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I don't have time to do the comparison right now, but at a glance the two chips to appear to be similar. Datasheets:
I always assumed it was the MPU's RAM where the volume level was saved, since all other RAM chips were volatile RAM since there was no battery to back them up.
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