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Guess I should add some photos so it's clear what hardware I'm talking about. First, a WARNING! label on top, which identifies it as the "SAYETT DATASHOW HR/M Video adapter": The connector on the back: Turns out that warning isn't even applicable since they actually used the SE's expansion...

Ah nice, thanks. Another fun bit: This PCB is three layers. never seen that before

On the adapter board, the white wire is labeled “dot clock” Pin 19 of the GLU is, unsurprisingly, a clock line, but I don’t know precisely what it should be called. It’s the same signal used as FCLK by the IWM. Is there no complete schematic of the SE out there? I know SE Reloaded exists, but...

I also acquired a Mac SE with one of these inside. The clip was attached to the GLU chip, pin 19

Sometimes they have WIMA MP-3 capacitors - these are metallized paper, and will fail exactly like the RIFA caps do.