I've had SCSI <-> ST506/412.
Do you know a source for a SCSI <-> SA400/800 ?
Some varients of the Omti 5000 boards had a floppy controller. There was
one that was SCSI to ST412 _and_ floppy, one that also had a QIC02 interface.
These boards were used in the PERQ 3a (AGW3300), and in Torch XXX/Quad-X
machines with ST412 hard drives. Torch workstations with SCSI hard drives
had a thing called a Manta board. This was a SCSI-floppy controller.
Don't ask me where to find a spare one, though.
-tony