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OMTI 8120, OMTI 8127

SCIENTIFIC MICRO SYSTEMS

OMTI 8120, OMTI 8127

Data bus: 16-bit, ISA

Size: Half-length, full-height card

Hard drives supported: OMTI 8120:Two MFM ST506/ST412 drives

OMTI 8127:Two RLL ST506/ST412 drives

Floppy drives supported: None

Maximum heads/cyl.: 16 heads and 2048 cylinders

CONNECTIONS

Function

Location

34-pin control cable connector-hard drive

J1

20-pin data cable connector-drive 0

J2

20-pin data cable connector-drive 1

J3

5-pin connector-DC power

J4

USER CONFIGURABLE SETTINGS

Function

Location

Setting

Factory configured - do not alter

W1

closed

 

If BIOS is #1002661, then drive 0 parameters are set to 4 hds. and 612 cyl. If BIOS is #1002662, then drive 0 parameter are set to 4 hds. and 615 cyl.

W1

open

 

If BIOS is #1002661, then drive 1 parameters are set to 4 hds. and 612 cyl. If BIOS is #1002662, then drive 1 parameter are set to 4 hds. and 615 cyl.

W2

open

Factory configured - do not alter

W2

closed

I/O speed set to high performance string mode

W3

open

 

I/O speed set to loop

W3

closed

Factory configured - do not alter

W4

N/A

BIOS base address is C8000h

W9

open

 

BIOS base address is CA000h

W9

closed

I/O PORT ADDRESS

Address

Jumper W5

Jumper W6

Jumper W7

320h

open

open

open

 

324h

closed

open

open

 

328h

open

closed

open

 

32Ch

closed

closed

open

 

1A0h

open

open

closed

 

1A4h

closed

open

closed

 

1A8h

open

closed

closed

 

1ACh

closed

closed

closed

DRIVE CONFIGURATION

DRIVE 1

DRIVE 0

BIOS #1002579

Jumper W1

Jumper W2

Jumper W3

Jumper W4

Cyl.

Hds.

closed

closed

closed

closed

-

-

open

closed

open

closed

987

7

closed

open

closed

open

918

15

open

open

open

open

612

4

DRIVE CONFIGURATION

DRIVE 1

DRIVE 0

BIOS #1002579

Jumper W1

Jumper W2

Jumper W3

Jumper W4

Cyl.

Hds.

closed

closed

closed

closed

-

-

open

closed

open

closed

820

6

closed

open

closed

open

1024

9

open

open

open

open

615

4