I have an actual Shugart (brand name) 10-meg MFM drive sitting here.. The model number is SA712
Both the Adaptec ACB-4000A (MFM-SCSI BRIDGE) and ACB-4070 (RLL-SCSI BRIDGE) will work with SCSI or SASI. Just install a jumper on the "I-J" position on J5. You would normally leave this jumper off in a standard SCSI system, but if your interface is SASI, you install this jumper and the Adaptec board will recognize the addtional commands from the SASI command set that were different in SCSI.
Also, in addition to the XEBEC 1410 MFM-SCSI bridge, there was a later model called the XEBEC 11410A. Not sure what the difference/improvements were between these two models.
Also, evidently Phillip Price did not think much of XEBEC.. Maybe his blew up or something, while he was working on Alternate Reality: The City. He named it "The City of XEBEC's demise."
What about this Xebec Adapter?
eBay Auction -- Item Number: 140517518783
Holy crap that's a lot of money. I paid $75 for TWO Xebec boards not long after I made my original post in this thread and got a photocopied manual with them.