By the way, it has a WD FD1771B floppy
 controller chip.  I've looked at the chip
 directory, Western Digital's web site and
 SMC's web site...  No luck. 
The 1771 is a single density only controller and not suitable for use with
3.5" disks.  You want a board with a 765 (compupro) or 1793 CCS and a raft
of others.
Allison