Macintosh Portable PSI RAM plus ??? Card

Sideburn

Tinkerer
Jun 16, 2023
255
84
28
California
youtube.com
Hey guys, I’ve acquired this RAM plus more expansion card for a portable. It’s showing 5MB in the finder.

but there’s 4 switches and two cards sandwiched together. Any idea what this card is and what all it can do?

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