Well… I figured out what the SCSI ID switch on the back of X68030 does, and uuuuuh.
I was a bit confused what the idea of that was, since there’s a SCSI_ID setting in SWITCH.X already which seems to select the SCSI ID of the computer.
So here’s the relevant part of the schematic of the SCSI IO board.
So it’s connected to pin 1-3 on the HC connector… what does that map to on the motherboard?
Absolutely nothing apparently. Pretty weird. Turns out the switch is just chilling there, not hooked up to anything then.