SVA (Sorrento Valley Associates) made an accessory
disk controller for
Apple ]['s. I don't remember whether it supported MFM, or just FM, but it
did support 8"
Many years ago I rememebr seeing a (commercial) add-on board for the
Apple ][ that contained a WD1771 and was linked to a pair of 8" drives
(standard Shugart interface from what I could tell). Of course that was
FM< (single density) only
I can;t rememerb who made it, my guess is there were several companines
making such boards.
-tony