esophagoose
The culprit. It's a 34-pin PCMCIA card (type I?). On inside is a few pull-ups and decoupling cap and a non-descript ROM
I ohm'd out power and ground and it didn't fit the standard pinouts for ROMs ICs or PC card / PCMCIA connectors. But after a bunch of digging and looking at old memory ICs, I found this:
Power and ground matched up and after ohm'ing out the rest of the pins, I'm fairly confident it's the right part:
- BYTE is hard-tied to ground means D8-D14 are high-Z and are not connected on the memory card
- Pull-ups are present on CE and OE
- A19 and A20 are not connected which makes sense, probably a lower capacity ROM
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