Floppy disk controller

I have a floppy controller and two dual-sided single density floppy drives. The floppy controller used the same bus as the Phunsy computer, but it is not listed on the Phunsy website. I do not know the origin of this board. Click on the pictures for a larger version.

FCon component side
Floppy controller, component side.
FCon solder side
Floppy controller, solder side.

I recreated the schematics for the controller by tracing the connections by hand.

Programming the controller is very similar to the descriptions in the FD1771 datasheet. In addition to the four ports described in the datasheet (addressed as extended IO-ports 80-83), the floppy controller uses extended IO-port 84 to read the interrupt status, or to select one of four disk drives. Drive 0 and 1 are on the first unit, side A and B; drive 2 and 3 are on the second unit, side A and B.

If you have any further information on this card, please let me know.