Date   : Sat, 10 Mar 1984 05:50:34 EST (Saturday)
From   : Maj Bower (HQ USEUCOM) <bower@dca-ems>
Subject: UFDC-1 disk controller

I am sending this to the net since my cry for help went that-a-way.
   The UFDC-1 controller (mine purchased from Compu/time) DOES
work with the Siemens FDD-221-5 80 track double-sided drive.  The
problem in my system came from relying on the controller documentation
when writing a customized BIOS.  BE ADVISED...Bit 5 of the control
byte to the controller should be a zero for side zero...NOT a one
for side zero as listed in the documentation.
   With the correct bit inserted, the board is FANTASTIC!  The
board is now configured with:
       Drive A - Tabor 3.25" - SS/DD - 12 mS steps - 384K
       Drive B - Siemens FDD-221-5 - DS/DD - 6 mS steps - 784K
       Drive C - Siemens FDD-100-8D - SS/DD - 6 mS steps - 636K
   With only a jumper change and drive swap, Drive B can change to
a Shugart SA-400 SS/DD - 20 mS steps - 160K.  A great controller
board...if only the documentation were correct.
                                       Hal