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