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Path: utzoo!watmath!clyde!burl!ulysses!mhuxl!ihnp4!zehntel!hplabs!sri-unix!bower@dca-ems
From: bower%dca-ems@sri-unix.UUCP
Newsgroups: net.micro.cpm
Subject: UFDC-1 disk controller
Message-ID: <17397@sri-arpa.UUCP>
Date: Sat, 10-Mar-84 05:50:34 EST
Article-I.D.: sri-arpa.17397
Posted: Sat Mar 10 05:50:34 1984
Date-Received: Tue, 13-Mar-84 07:57:35 EST
Lines: 18

From:  Maj Bower (HQ USEUCOM) 

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