SEAGATE TECHNOLOGY, INC.
========================

   ST11M, ST11R

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

   Data bus: 8-bit, ISA

   Size: Half-length, full-height card

   Hard drives supported:  ST11M: Two MFM ST506/412 drives

   ST11R: Two RLL ST506/412 drives

   Floppy drives supported: None

<gopher://bitreich.org/I/th99/c/S-T/20196-1.png>
   

   +------------------------------------------------------------+
   |                        CONNECTIONS                         |
   |------------------------------------------------------------|
   |                 Function                  |    Location    |
   |-------------------------------------------+----------------|
   | 34-pin control cable connector-hard drive |       J2       |
   |-------------------------------------------+----------------|
   | 20-pin data cable connector-drive 0       |       J3       |
   |-------------------------------------------+----------------|
   | 20-pin data cable connector-drive 1       |       J4       |
   |-------------------------------------------+----------------|
   | 5-pin connector-DC power                  |       J5       |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                BIOS &AMP; I/O PORT ADDRESS                 |
   |------------------------------------------------------------|
   |    BIOS Address     | I/O Port Address |   JP1   |  JP1A   |
   |---------------------+------------------+---------+---------|
   |>> |      C800h      |     320-323h     |  open   |  open   |
   |---+-----------------+------------------+---------+---------|
   |   |      D000h      |     324-327h     | closed  |  open   |
   |---+-----------------+------------------+---------+---------|
   |   |      D800h      |     328-32Bh     |  open   | closed  |
   |---+-----------------+------------------+---------+---------|
   |   | E000h (XT only) |     32C-32Fh     | closed  | closed  |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |              ST11M SUPPORTED DISK PARAMETERS               |
   |------------------------------------------------------------|
   |   Capacity    |    Heads    |   Cylinders   |   Sectors    |
   |---------------+-------------+---------------+--------------|
   |     21.4      |      4      |      615      |      17      |
   |---------------+-------------+---------------+--------------|
   |     32.1      |      6      |      615      |      17      |
   |---------------+-------------+---------------+--------------|
   |     42.5      |      5      |      977      |      17      |
   |---------------+-------------+---------------+--------------|
   |     42.8      |      6      |      820      |      17      |
   |---------------+-------------+---------------+--------------|
   |     44.5      |      5      |     1024      |      17      |
   |---------------+-------------+---------------+--------------|
   |     80.2      |      9      |     1024      |      17      |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |              ST11R SUPPORTED DISK PARAMETERS               |
   |------------------------------------------------------------|
   |   Capacity    |    Heads    |   Cylinders   |   Sectors    |
   |---------------+-------------+---------------+--------------|
   |     32.7      |      4      |      615      |      26      |
   |---------------+-------------+---------------+--------------|
   |     49.1      |      6      |      615      |      26      |
   |---------------+-------------+---------------+--------------|
   |     21.1      |      2      |      667      |      31      |
   |---------------+-------------+---------------+--------------|
   |     32.7      |      4      |      615      |      26      |
   |---------------+-------------+---------------+--------------|
   |     42.9      |      4      |      667      |      31      |
   |---------------+-------------+---------------+--------------|
   |     65.5      |      6      |      820      |      26      |
   |---------------+-------------+---------------+--------------|
   |     122.7     |      9      |     1024      |      26      |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |               MISCELLANEOUS TECHNICAL NOTES                |
   |------------------------------------------------------------|
   |  This controller has a built-in low-level format program.  |
   |  To enter the program run the DEBUG utility supplied with  |
   |  DOS and at the prompt enter: G=C800:5. If the error BAD   |
   |  DRIVE!(4) comes up during low-level the controller will   |
   | stop the format and exit. This is a bug in the controller  |
   | that causes it to halt on bad sectors that are not flagged |
   | in the bad track table. In no way does this mean you have  |
   |  a bad drive! Simply write down the head and cylinder at   |
   | the point the controller stopped, start the low-level over |
   | again and add this to the bad track table. (You must watch |
   |   closely to catch the head and cylinder; the screen is    |
   | cleared right after the error is hit.) If it still returns |
   |   a BAD DRIVE!(4) message on the same head and cylinder,   |
   | then enter the head and cylinder into the bad track table  |
   |  twice. Once with the actual BFI and once with a BFI 2000  |
   | numbers apart from the first. The ST11R is one of the only |
   |  8-bit controllers that support 31 sectors per track. The  |
   |  Seagate ST225R hard drive uses 31 sectors per track and   |
   | thus must use this controller not a regular 26 sectors per |
   |                   track RLL controller.                    |
   +------------------------------------------------------------+