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OMTI 7250

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.