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