So I was able to salvage a GS from our local ewaste facility and I've been able to get it up and running with ADTPro (speediboot however doesn't work, and I seem to be only able to transfer over serial with pin 8 on the gs serial port empty). Trouble is it only had a 5.25" floppy drive, and I have no disks (and no money to buy them online). I do however have a couple Mac Pluses, a couple LCs, A Mac II, a Classic II, and an M0130 external drive (ewates has been good to me). So I'm flush with mac 3.5" floppy drives and I have a 20 pin ribbon to DB-19 adapter from the M0130.
From what I've read the original 3.5" floppy of the GS was the same model as the internal 800k floppy from the plus and that even later superdrives could be swapped in, though you couldn't use 1.44mb.
I've been reading the BMOW blog on the FloppyEMU. He goes into quite some detail on the signals on all 19 pins of the GS port and all 20 pins of the ribbon connector for the mac and Apple 3.5" drives. Now since I'm not trying to daisy chain anything, just connect the Mac Plus floppy to the GS, everything I read seems to indicate that I would just need to jumper pins 16 and 20 together to get it to work, however after doing that the drive doesn't spin on startup at all. The heads move slightly, but that's it. It isn't seen in ADTPro at all so I can't format anything
So what I'm wondering is what I have to do to connect a single 3.5" floppy drive to the GS. These drives are working, they have been tested in a Mac previously.