Industrial Micro Systems -  FDC (930)
The model 930 Floppy Disk Controller board was slight an upgrade of the IMS 400 and 430 FDC boards. The board was used in their 5000 Series system.

The IMS FDC 930 board used the NEC 765 FDC controller chip rather than the WD 179x series. The board could be configured to work with 8" or 5" drives (Switch 1-6) and  in single and double density. An on board 8257 DMA controller provided for fast disk I/O. The board could control up to 4 drives.  The board had a jumper (JA)  to be wired differently depending on the IMS CPU board in the system so this board is probably not compatible with all early  S-100 CPU's and its unknown to me if its IEE 696 compatible. Stealing DMA cycles on the bus is tricky!
 
The very limited manual for this board can be obtained here. 
 
There is no schematic included but it if probably very closely related to the one for the 400 series board here.

Other IMS S-100 Boards
16K RAM   32K RAM    64K DRAM    80186 CPU    FDC 400    FDC 930    HDC    IO Board    Z80 CPU  
8K RAM   4 Line Serial     CPZ 4800   LANS100    CPS-Q6A   Other Boards