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OMTI 7100, OMTI 7200, OMTI 7400

SCIENTIFIC MICRO SYSTEMS, INC.

OMTI 7100, OMTI 7200, OMTI 7400

Data bus:

50-pin SCSI interface

Size:

5.25" FF

Hard drive supported:

Up to two ST506/412 MFM drives, up to two ESDI drive

Floppy drives supported:

Two 360KB, 720KB, 1.2MB, 1.44Mb or 8" drives (except 7100)

   

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 (not in 7100)

J7

50-pin tape drive connector (7400 only)

J8

DC power connector

J10

USER CONFIGURABLE SETTINGS

Function

Location

Setting

SCSI parity enabled

W4

closed

SCSI parity disabled

W4

open

Spindle motor starts on power up (used with ESDI)

W5

closed

Spindle motor starts on command only (used with ESDI)

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

Factory configured - do not alter

W8

N/A

Factory configured - do not alter

W9

N/A

Factory configured - do not alter

W10

N/A

Factory configured - do not alter

W11

N/A

Factory configured - do not alter

W12

N/A

Factory configured - do not alter

W13

N/A

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

Factory configured - do not alter

W17

N/A

Motor on signal delay enabled

W18

open

Motor on signal enabled

W18

closed

Factory configured - do not alter

W21

N/A

Factory configured - do not alter

W22

N/A

QIC-02 (tape drive) parity enabled (7400 only)

W25

closed

QIC-02 (tape drive) parity disabled (7400 only)

W25

open

Factory configured - do not alter

W29

N/A

Disk change detection from FDD connector pin 2 enabled

W37

closed

Disk change detection from FDD connector pin 2 disabled

W37

open

Disk change detection from FDD connector pin 34 enabled

W38

closed

Disk change detection from FDD connector pin 34 disabled

W38

open

Clear disk change signal disabled

W39

open

Clear disk change signal enabled

W39/pins 1 & 2

closed

Note: Drive select 1 & 2 refer to the drive select jumper setting on the drive itself and should be set to 1 & 2 respectively.

When W39/pins 1 & 2 closed drive select 4 must not be used.

Jumpers W15, W16, W17, W18, W37, W38, W39 refer to flexible disk drives and apply only to models 7200 & 7400.

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