SCIENTIFIC MICRO SYSTEMS, INC.
OMTI 7250
Data bus: | 50-pin SCSI interface |
Size: | 5.75" x 8" |
Hard drive supported: | Up to two ST506/412 MFM drives, up to two ST506/412 RLL 2,7 drives, up to two ESDI drives |
Floppy drives supported: | Two 360KB, 720KB, 1.2MB, 1.44MB drives or 8" |
CONNECTIONS | |
Function | Location |
50-pin SCSI interface | J1 |
34-pin ESDI or MFM disk control connector | J2 |
20-pin data cable connector | J3 |
20-pin data cable connector | J4 |
34-pin floppy drive connector | J7 |
DC power connector | J10 |
SCSI ADDRESS | ||||
SCSI ID | W1 | W2 | W3 | |
» | 0 | open | open | open |
» | 1 | closed | open | open |
» | 2 | open | closed | open |
» | 3 | closed | closed | open |
» | 4 | open | open | closed |
» | 5 | closed | open | closed |
» | 6 | open | closed | close |
» | 7 | closed | closed | closed |
USER CONFIGURABLE SETTINGS | |||
Function | Location | Setting | |
» | SCSI parity enabled | W4 | closed |
» | SCSI parity disabled | W4 | open |
» | Factory configured - do not alter | W5 | open |
» | ST506/412 interface for drive select 1 enabled | W6 | open |
» | ESDI interface for drive select 1 enabled | W6 | closed |
» | ST506/412 interface for drive select 2 enabled | W7 | open |
» | ESDI interface for drive select 2 enabled | W7 | closed |
» | TRMPWR supplied by board | W14/pins 1 & 2 | closed |
» | TRMPWR supplied by SCSI bus | W14/pins 2 & 3 | closed |
» | Ready signal from pin 2 to FDC 765 disabled | W15 | open |
» | Ready signal from pin 2 to FDC 765 enabled | W15 | closed |
» | Ready signal from pin 34 to FDC 765 disabled | W16 | open |
» | Ready signal from pin 34 to FDC 765 enabled | W16 | closed |
» | Ready override to FDC 765 disabled (Rev. B only) | W17 | open |
» | Ready override to FDC 765 enabled (Rev. B only) | W17 | closed |
» | Motor On signal delay enabled | W18 | open |
» | Motor On signal enabled | W18 | closed |
» | Factory configured - do not alter | W37 | open |
» | Factory configured - do not alter | W38 | open |
» | Factory configured - do not alter | W39 | open |
Note: Drive select 1 & 2 refer to the drive select jumper setting on the drive itself and should be set to 1 & 2 respectively. The location of W39 is unidentified. |
LUN 0 DISK TYPE CONFIGURATION | |||
Drive Type | W9 | W10 | |
» | ST506/412 | open | open |
» | ESDI | closed | open |
» | Removable ST506/412 | open | closed |
» | Flexible disk | closed | closed |
LUN 1 DISK TYPE CONFIGURATION | |||
Drive Type | W12 | W13 | |
» | ST506/412 | open | open |
» | ESDI | closed | open |
» | Removable ST506/412 | open | closed |
» | Flexible disk | closed | closed |
LUN 0/1 FLEXIBLE DISK DATA RATE | |||
Data Rate | W8(Lun 0) | W11(Lun 1) | |
» | 250 Kbit | open | open |
» | 500 Kbit | closed | closed |
Note: These settings apply only when W9 & W10 are both closed. |
LUN 0/1 SECTOR TYPE CONFIGURATION | |||
Mode | W8(Lun 0) | W11(Lun 1) | |
» | Soft sector enabled | open | open |
» | Hard sector enabled | closed | closed |
Note: These settings apply only when drive type is set to ST506/412. |