UNIDENTIFIED

OPTI 486-25/33

Processor

80486SX

Processor Speed

25/33

Chip Set

OPTI

Max. Onboard DRAM

32MB

Cache

64/128KB (external cache card)

BIOS

AMI

Dimensions

330mm x 218mm

I/O Options

32-bit external memory card, 32-bit external cache card

NPU Options

4167

CONNECTIONS

Purpose

Location

Purpose

Location

External battery

J1

Power LED & keylock

J27

Turbo LED

J25

Reset switch

SW1

Speaker

J26

32-bit external memory card

SL1

USER CONFIGURABLE SETTINGS

Function

Jumper

Position

»

Monitor type select color

JP2

Closed

 

Monitor type select monochrome

JP2

Open

»

Cache enabled

JP5, JP6

Open

 

Cache disabled

JP5, JP6

Closed

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) 1M x 9

NONE

NONE

NONE

4MB

(4) 256K x 9

(4) 256K x 9

(4) 256K x 9

(4) 256K x 9

5MB

(4) 256K x 9

(4) 1M 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

12MB

(4) 1M x 9

(4) 1M x 9

(4) 1M x 9

NONE

16MB

(4) 4M x 9

NONE

NONE

NONE

16MB

(4) 1M x 9

(4) 1M x 9

(4) 1M x 9

(4) 1M x 9

32MB

(4) 4M x 9

(4) 4M x 9

NONE

NONE

36MB

(4) 4M x 9

(4) 4M x 9

(4) 1M x 9

NONE

40MB

(4) 4M x 9

(4) 4M x 9

(4) 1M x 9

(4) 1M x 9

Note:Banks 2 & 3 are located on the external memory card..

EXTERNAL CACHE CARD JUMPER CONFIGURATION

Size

JP1

JP2

JP3

JP4

JP5

64KB

1 & 2

Open

Open

1 & 2

1 & 2

128KB

2 & 3

Closed

Closed

2 & 3

2 & 3

Note:Pins designated should be in the closed position. JP1-5 are located on the external cache card.