Very cool! What brand is your card, hard to imagine Apple would uprovide a card that would be capable of upgrade, but the price of PSRAM in that time frame they might have? Full spec for the memory card is in that DevNote. I pulled all the documentation I could find together in this post:
PB100-PSRAM-Pinout PB100-ROM-TC531001CF-Pinout
68kmla.org
My bad. I though you were saying another thing (non native english speaker here)
No problem, I'm not very good at writing, between the two explanations the point might be clear. My last statement wasn't entirely clear, SE could be conflated with Macintosh_II architecture the way it was phrased.
The Mac II introduced Slot Manager method of addressing multiple expansion cards, while the SE PDS merely broke out the 68000 IC's pins to a buffered connector, that "slot" had been in use since the 128K.