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# SEAGATE TECHNOLOGY INC.
ST22M, ST22R
+------------------------------------------------------------+
+------------------------------------------------------------+
Data bus: 16-bit, ISA
Size: Half-length, full-height card
Hard drives supported: ST22M: Two MFM ST506/412 drives
ST22R: Two RLL ST412 drives
Floppy drives supported: Two 360KB, 720KB, 1.2MB, or 1.44MB
(IMG) IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Function | Location |
|----------------------------------------------+-------------|
| 34-pin control cable connector- floppy drive | J1 |
|----------------------------------------------+-------------|
| 34-pin control cable connector-hard drive | J2 |
|----------------------------------------------+-------------|
| 20-pin data cable connector-drive 0 | J3 |
|----------------------------------------------+-------------|
| 20-pin data cable connector-drive 1 | J4 |
|----------------------------------------------+-------------|
| 4-pin connector-drive active LED | J5 |
|----------------------------------------------+-------------|
| 5-pin connector-DC power | J6 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Location | Setting |
|-------------------------------+--------------+-------------|
| » | BIOS enabled | JP3 | open |
|---+---------------------------+--------------+-------------|
| | BIOS disabled | JP3 | closed |
|---+---------------------------+--------------+-------------|
| » | Floppy drive enabled | JP4 | closed |
|---+---------------------------+--------------+-------------|
| | Floppy drive disabled | JP4 | open |
+------------------------------------------------------------+
+------------------------------------------------------------+
| I/O AND BIOS ADDRESS |
|------------------------------------------------------------|
| HD Port Address | FD Port | BIOS | JP1 | JP2 |
| | Address | Address | | |
|------------------+----------+------------+--------+--------|
| » | 1F0-1F7, | 3F0-3F5, | C800-CBFF | open | open |
| | 3FF-3F7 | 3F7 | | | |
|---+--------------+----------+------------+--------+--------|
| | 1F0-1F7, | 3F0-3F5, | CC00-CFFF | open | closed |
| | 3F6-3F7 | 3F7 | | | |
|---+--------------+----------+------------+--------+--------|
| | 170-177, | 370-375, | D800-DBFF | closed | open |
| | 376-377 | 377 | | | |
|---+--------------+----------+------------+--------+--------|
| | 170-177, | 370-375, | DC00-DFFF | closed | closed |
| | 376-377 | 377 | | | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRIVE PARAMETERS SUPPORTED BY THE ST22M |
|------------------------------------------------------------|
| Capacity | Heads | Cylinders | SPT |
|---------------+---------------+---------------+------------|
| 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 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRIVE PARAMETERS SUPPORTED BY THE ST22R |
|------------------------------------------------------------|
| Capacity | Heads | Cylinders | SPT |
|---------------+---------------+---------------+------------|
| 21.1 | 2 | 667 | 31 |
|---------------+---------------+---------------+------------|
| 32.7 | 4 | 615 | 26 |
|---------------+---------------+---------------+------------|
| 42.9 | 4 | 667 | 31 |
|---------------+---------------+---------------+------------|
| 49.1 | 6 | 615 | 26 |
|---------------+---------------+---------------+------------|
| 65.5 | 6 | 820 | 26 |
|---------------+---------------+---------------+------------|
| 122.7 | 9 | 1024 | 26 |
+------------------------------------------------------------+