DATA TECHNOLOGY CORPORATION
===========================

   DTC5280I, DTC7280

   +------------------------------------------------------------+
   +------------------------------------------------------------+

   Data bus: 16-bit, ISA

   Size: Full-length, full-height card

   Hard drives supported:  Two MFM ST506/412 drives

   Floppy drives supported: Two 360KB, 720KB, 1.2MB, or 1.44MB

   Interface: DTC5280i: 2:1

   DTC7280: 1:1

<gopher://bitreich.org/I/th99/c/C-D/20071-1.png>
   

   +------------------------------------------------------------+
   |                        CONNECTIONS                         |
   |------------------------------------------------------------|
   |                  Function                   |   Location   |
   |---------------------------------------------+--------------|
   | 34-pin control cable connector-floppy drive |      J1      |
   |---------------------------------------------+--------------|
   | 34-pin data cable connector-hard drive      |      J2      |
   |---------------------------------------------+--------------|
   | 20-pin data cable connector-drive 0         |      J3      |
   |---------------------------------------------+--------------|
   | 20-pin data cable connector-drive 1         |      J4      |
   |---------------------------------------------+--------------|
   | 5-pin connector-drive active LED            |      J5      |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                 USER CONFIGURABLE SETTINGS                 |
   |------------------------------------------------------------|
   |               Function                | Location | Setting |
   |---------------------------------------+----------+---------|
   |>> | Initial floppy data transfer rate |    W4    |  open   |
   |   | is 500KHz                         |          |         |
   |---+-----------------------------------+----------+---------|
   |   | Initial floppy data transfer rate |    W4    | closed  |
   |   | is 250KHz                         |          |         |
   |---+-----------------------------------+----------+---------|
   |>> | Hardware drive select mode        |    W5    | closed  |
   |   | enabled                           |          |         |
   |---+-----------------------------------+----------+---------|
   |   | Firmware drive select mode        |    W5    |  open   |
   |   | enabled                           |          |         |
   |---+-----------------------------------+----------+---------|
   |>> | Auto-deselect enabled             |    W6    | closed  |
   |---+-----------------------------------+----------+---------|
   |   | Auto-deselect disabled            |    W6    |  open   |
   |---+-----------------------------------+----------+---------|
   |>> | Floppy drive precompensation is   |    W7    |  open   |
   |   | scaled by data rate:              |          |         |
   |   |                                   |          |         |
   |   | 500KHz=125ns, 300KHz=208ns,       |          |         |
   |   | 250KHz=250ns                      |          |         |
   |---+-----------------------------------+----------+---------|
   |   | Floppy drive precompensation is   |    W7    | closed  |
   |   | 125ns                             |          |         |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                  HARD DRIVE PORT ADDRESS                   |
   |------------------------------------------------------------|
   |                Address                 |   W2    |   W3    |
   |----------------------------------------+---------+---------|
   |>> | Port addresses are 1F0-1F7 3F03F7h |  open   |  open   |
   |---+------------------------------------+---------+---------|
   |   | Port addresses are 170-177 370377h | closed  | closed  |
   +------------------------------------------------------------+