(TXT) View Source
# SEAGATE TECHNOLOGY INC.
ST21M, ST21R
Data bus: 16-bit, ISA
Size: Half-length, full-height card
Hard drives supported: Two MFM ST506/ST412 drives (ST21M)
Two RLL ST412 drives (ST21R)
Floppy drives supported: None
(IMG) IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Function | Location |
|-------------------------------------------+----------------|
| 34-pin control cable connector-hard drive | J2 |
|-------------------------------------------+----------------|
| 20-pin data cable connector-drive 1 | J3 |
|-------------------------------------------+----------------|
| 20-pin data cable connector-drive 0 | J4 |
|-------------------------------------------+----------------|
| 4-pin connector-drive active LED | J5 |
|-------------------------------------------+----------------|
| 5-pin connector-DC power | J6 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| BIOS ENABLE |
|------------------------------------------------------------|
| Function | Location | Setting |
|------------------------------+--------------+--------------|
| ยป | BIOS enabled | JP3 | open |
|---+--------------------------+--------------+--------------|
| | BIOS disabled | JP3 | closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| I/O AND BIOS ADDRESS |
|------------------------------------------------------------|
| Hard/Floppy Drive | BIOS Addresss | JP1 | JP2 |
| Address | | | |
|--------------------------+---------------+--------+--------|
| 1F0-1F7/3F6-3F7h | C8000-CBFFFh | open | open |
|--------------------------+---------------+--------+--------|
| 1F0-1F7/3F6-3F7h | CC000-CFFFFh | open | closed |
|--------------------------+---------------+--------+--------|
| 170-177/376-377h | D8000-DBFFFh | closed | open |
|--------------------------+---------------+--------+--------|
| 170-177/376-377h | DC000-DFFFFh | closed | closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRIVE PARAMETERS SUPPORTED BY THE ST21M |
|------------------------------------------------------------|
| Capacity | Heads | Cylinder | 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 |
|---------------+---------------+---------------+------------|
| 83.9 | 9 | 1072 | 17 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRIVE PARAMETERS SUPPORTED BY THE ST21R |
|------------------------------------------------------------|
| Capacity | Heads | Cylinder | SPT |
|---------------+---------------+---------------+------------|
| 21.17 | 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 |
|---------------+---------------+---------------+------------|
| 128.4 | 9 | 1072 | 26 |
+------------------------------------------------------------+