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# 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
(IMG) IMG 1
+------------------------------------------------------------+
| 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 & I/O PORT ADDRESS |
|------------------------------------------------------------|
| BIOS Address | I/O Port Address | JP1 | JP1A |
|---------------------+------------------+---------+---------|
| ยป | 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. |
+------------------------------------------------------------+