486-25 Motherboard Settings and Configuration

Processor

80486DX

Processor Speed

25MHz

Chip Set

OPTI

Max. Onboard DRAM

16MB

Cache

64/128KB

BIOS

Omnitel

Dimensions

355mm x 304mm

I/O Options

None

NPU Options

4167

CONNECTIONS

Purpose

Location

Purpose

Location

External battery

J1

Power LED & keylock

J26

Turbo LED

J11/pins 1 & 2

Reset switch

J31

Speaker

J25

USER CONFIGURABLE SETTINGS

Function

Jumper

Position

»

Password enabled

J43

Closed

Password disabled

J43

Open

»

External cache enabled

J50

Open

External cache disabled

J50

Closed

»

POST enabled

J51

Closed

POST disabled

J51

Open

»

Battery select internal

J52

pins 1 & 2 closed

Battery select external

J52

pins 2 & 3 closed

»

BIOS type select 27256

J60

pins 2 & 3 closed

BIOS type select 27512

J60

pins 1 & 2 closed

Note:The location of jumpers J50 & J51 are unidentified.

DRAM CONFIGURATION

Size

Bank 0

Bank 1

Bank 2

Bank 3

1MB

(4) 256K x 9

NONE

NONE

NONE

2MB

(4) 256K x 9

(4) 256K x 9

NONE

NONE

3MB

(4) 256K x 9

(4) 256K x 9

(4) 256K x 9

NONE

4MB

(4) 256K x 9

(4) 256K x 9

(4) 256K x 9

(4) 256K x 9

4MB

(4) 1M x 9

NONE

NONE

NONE

5MB

(4) 256K x 9

(4) 1 M x 9

NONE

NONE

6MB

(4) 256K x 9

(4) 256K x 9

(4) 1M x 9

NONE

7MB

(4) 256K x 9

(4) 256K x 9

(4) 256K x 9

(4) 1M x 9

8MB

(4) 1M x 9

(4) 1M x 9

NONE

NONE

9MB

(4) 256K x 9

(4) 1M x 9

(4) 1M x 9

NONE

10MB

(4) 256K x 9

(4) 256K x 9

(4) 1M x 9

(4) 1M x 9

12MB

(4) 1M x 9

(4) 1M x 9

(4) 1M x 9

NONE

13MB

(4) 256K x 9

(4) 1M x 9

(4) 1M x 9

(4) 1M x 9

16MB

(4) 1M x 9

(4) 1M x 9

(4) 1M x 9

(4) 1M x 9

CACHE CONFIGURATION

Size

Bank 0

Bank 1

64KB

(8) 8K x 8

NONE

128KB

(8) 8K x 8

(8) 8K x 8

CACHE JUMPER CONFIGURATION

Size

J44

J45

J46

J47

J48

64KB

Open

Open

1 & 2

1 & 2

1 & 2

128KB

Closed

Closed

2 & 3

2 & 3

2 & 3

Note: Pins designated should be in the closed position.