Cromemco WDI Controller
Good Luck!
If it's really a WDI (as opposed to a WDI-II), AFAIK the
only drives that it will control are 7700 series IMI drives
(the 8" drives in a Z2-H or HDD11/22). The WDI-II will
control the 5" IMI drives, but they're pretty scarce as well.
For MFM drives, Cromemco had an STDC controller.
mike