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Last friday I started debugging the ZIP RAM bank.

Someone on the Acill Classics repair chat suggested running ziptest, an awesome tool probes each ZIP slot to debug issues like mine:
https://aminet.net/package/util/misc/ZIPTest-1.1

I populated the first 4MB of ZIP slots populated, and booted OS 3.2.2, which didn't recognize any Fast RAM in the expected range, $07000000-$07FFFFFF.

The output of ziptest makes me think that the entire bus is busted. Perhaps I have a broken Ramsey?