bower%dca-ems@sri-unix.UUCP (03/10/84)
From: Maj Bower (HQ USEUCOM) <bower@dca-ems> 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