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OMTI 5520, OMTI 5527

SCIENTIFIC MICRO SYSTEMS

OMTI 5520, OMTI 5527

Data bus: 8-bit, ISA

Size: Half-length, full height card

Hard drives supported: OMTI 5520:Two MFM ST506/ST412 drives

OMTI 5527: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

CN1

20-pin data cable connector-drive 0

CN2

20-pin data cable connector-drive 1

CN3

6-pin DC power connector

J4

USER CONFIGURABLE SETTINGS

Function

Location

Setting

»

BIOS enabled

W7

open

 

BIOS disabled

W7

closed

»

BIOS base address is C8000h

W8

open

 

BIOS base address is CA000h

W8

closed

»

Drive 0 soft sectored

W11

open

 

Drive 0 hard sectored

W11

closed

»

Drive 1 soft sectored

W14

open

 

Drive 1 hard sectored

W14

closed

 

Not used

WP9

 
 

Drive 0 is a removable drive ;drive 1 is a fixed drive

(OMTI 5527 only,JP10-11 are not used on the 5520)

W10

W11

closed

open

 

Drive 0 & 1 are both hard sectored

(OMTI 5527 only, JP10-11 are not used on the OMTI 5520.)

W10

W11

open

closed

»

Factory configured - do not alter

W12

N/A

»

Not documented

W17,19,20,

27,28,29,30

N/A

I/O PORT ADDRESS

Address

Jumper W5

Jumper W6

»

320h

open

open

 

324h

closed

open

 

328h

open

closed

 

32Ch

closed

closed

MISCELLANEOUS TECHNICAL NOTES

W1 through W4 are used to configured the drive type as supported by the BIOS. To support most of the drives on the market, there are several different BIOS’s offered. The different BIOS drive type tables are listed with the OMTI 5510; The settings are the same for the 5520 and the 5527