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Yes, I'm sure the UDC works with Unidisk 3.5 drives, and Apple 3.5 drives.
I'm using a Apple 3.5 superdrive controller with my Unidisk 3.5 drives at
the moment because I consider it a more reliable controller.  I use 2 Laser
3.5 drives on one of my UDC's, 2 clone Mac external drives on another, and
2 Apple 400K Mac external drives (O L D y, but moldy?) on my third UDC.

All those drives work on a Mac, so I venture other Mac compatible drives
do too!  

No, a IIc requires a true Apple Unidisk 3.5 drive.  I'm not sure anyone
else ever produced a Unidisk 3.5 compatible.  The Unidisk 3.5 was considered
a 'smart' drive, with an embedded 6502 processor in its innards.  The Mac's
never supported such.  It is possible to 'lobotomize' a Unidisk 3.5 to work
on a Mac however.

You have peaked my curiosity about the UDC and Unidisks though.  I 'remember'
them working together, but now I'm wondering if I'm 'mis-remembering'?  I
need to try again. Uhm, the Unidisks are at work, and the UDC's are at home.
How shall they ever meet?  

Have you tried the Unidisk on the UDC?  I don't think it will hurt.  I tried
a Unidisk on a UDC we suspected was bad (it was), but it didn't hurt it.

  --Steven Nelson          steven-nelson@uiowa.edu