ST21M, ST21R Hard Disk/Floppy Controller Settings and Configuration
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
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 | |
| » | BIOS enabled | JP3 | open |
BIOS disabled | JP3 | closed | |
I/O AND BIOS ADDRESS | |||
Hard/Floppy Drive Address | BIOS Addresss | JP1 | JP2 |
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 |
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