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OMTI 810, OMTI 812, OMTI 820, OMTI 822

SCIENTIFIC MICRO SYSTEMS

OMTI 810, OMTI 812, OMTI 820, OMTI 822

Data bus: 16-bit, ISA

Size: Full-length, full-height card

Hard drives supported: Up to seven SCSI devices

Floppy drives supported: OMTI 81x: None

OMTI 82x: Two 360KB, 720KB, 1.2MB, 1.44MB

Maximum heads/cyl.: 16 heads and 1024 cylinders

CONNECTIONS

Function

Location

50-pin SCSI connector-internal

J1

50-pin SCSI connector-external (Models 8x2 only)

J2

34-pin control cable connector-floppy drive

J3

4-pin connector-drive active LED

J4

USER CONFIGURABLE SETTINGS

Function

Location

Setting

SCSI parity check enabled

W3

closed

 

SCSI parity check disabled

W3

open

Factory configured - do not alter

W4

open

Factory configured - do not alter

W10

open

AT-type floppy drives supported (Models 82x only)

W11

open

 

Non-stand. floppy drives supported (Models 82x only)

W11

closed

 

Factory set on board 32K PROM size

W15

open

Factory configured - do not alter

W26

open

SCSI-2 RSVD lines grounded (terminators installed)

W32

closed

 

SCSI-2 RSVD lines not grounded (terminators removed)

W32

open

Floppy drive port address is 3F0-3F7 (Models 82x only)

W33

pins 1 & 2 closed

 

Floppy drive port address is 370-377 (Models 820x only)

W33

pins 2 & 3 closed

Floppy drive enabled

W35

closed

 

Floppy drive disabled

W35

open

Power-ground and chassis-ground separate

W44

open

 

Power-ground and chassis-ground connected

W44

closed

SCSI ADDRESS

Address

W0

W1

W2

 

0

closed

closed

closed

 

1

open

closed

closed

 

2

closed

open

closed

 

3

open

open

closed

 

4

closed

closed

open

 

5

open

closed

open

 

6

closed

open

open

7

open

open

open

BIOS ADDRESS

Select

W15

W16

W17

 

C0000h

closed

closed

closed

 

C8000h

open

closed

closed

 

D0000h

closed

open

closed

D8000h

open

open

closed

 

E0000h

closed

closed

open

 

E8000

open

closed

open

 

F0000h

closed

open

open

 

F8000h

open

open

open

I/O PORT ADDRESS

Address

W5

W6

W7

W8

W9

 

100

closed

closed

closed

open

closed

 

120

open

closed

closed

open

closed

 

140

closed

open

closed

open

closed

 

160

open

open

closed

open

closed

 

180

closed

closed

open

open

closed

 

1A0

open

closed

open

open

closed

 

1C0

closed

open

open

open

closed

 

1E0

open

open

open

open

closed

 

200

closed

closed

closed

closed

open

 

220

open

closed

closed

closed

open

 

240

closed

open

closed

closed

open

 

260

open

open

closed

closed

open

 

280

closed

closed

open

closed

open

 

2A0

open

closed

open

closed

open

 

2C0

closed

open

open

closed

open

 

2E0

open

open

open

closed

open

 

300

closed

closed

closed

open

open

 

320

open

closed

closed

open

open

340

closed

open

closed

open

open

 

360

open

open

closed

open

open

 

380

closed

closed

open

open

open

 

3A0

open

closed

open

open

open

 

3C0

closed

open

open

open

open

 

3E0

open

open

open

open

open

DMA CHANNEL

Channel

W20

W21

W22

W23

W24

W25

 

DRQ3

closed

open

open

open

closed

closed

DRQ5

open

closed

open

open

closed

open

 

DRQ6

open

open

closed

open

open

closed

 

DRQ7

open

open

open

closed

open

open

INTERRUPT REQUEST

IRQ

W27

W28

W29

W30

 

Disabled

N/A

N/A

N/A

closed

 

IRQ3

closed

closed

closed

open

 

IRQ4

open

closed

closed

open

 

IRQ5

closed

open

closed

open

 

IRQ6

open

closed

closed

open

 

IRQ7

closed

closed

open

open

IRQ12

open

closed

open

open

 

IRQ14

closed

open

open

open

 

IRQ15

open

open

open

open

MISCELLANEOUS TECHNICAL NOTES

W12-14, W31, W34, W36, W37, W43, W45 are factory configurable or Not used and are hard wired on some board revisions. The default for these jumpers is "open", with a jumper stored on pin 2.