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My board is once again presenting a simasimac pattern on boot. Poking around the board with a scope I can see activity on address lines and data lines, but I noticed that the CPU never addresses into VRAM (pin 8 of UJ6 never goes low) and I'm guessing that's why the /WE pin on the VRAMs never go...

I recently picked up my first vintage Macintosh, an SE/30 sold as-is and received it today. To my dismay, the board was swapped at some point with an SE board. I want to try and pick up a loose SE/30 board soon, but now that I know the board has been swapped I'm not sure how much the rest of the...