UNIDENTIFIED

OPTI486DX-33/50WB, 486SX-20/25WB

Processor

80486SX/80486DX

Processor Speed

20/25/33/50(internal)MHz

Chip Set

OPTI

Max. Onboard DRAM

40MB (8MB on external memory card)

Cache

64/256KB

BIOS

AMI

Dimensions

330mm x 218mm

I/O Options

32-bit external memory card

NPU Options

4167

CONNECTIONS

Purpose

Location

Purpose

Location

External battery

J10

32-bit external memory card

SL1

Turbo LED

J12

Reset switch

SW1

Power LED & keylock

J23

Turbo switch

SW2

Speaker

J24

   

USER CONFIGURABLE SETTINGS

Function

Jumper

Position

»

Monitor type select monochrome

JP1

Open

 

Monitor type select color

JP1

Closed

»

CMOS memory normal operation

JP2

pins 2 & 3 closed

 

CMOS memory clear

JP2

pins 1 & 2 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) 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) 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) 1M x 9

(4) 1M x 9

(4) 1M x 9

(4) 1M x 9

16MB

(4) 4M x 9

NONE

NONE

NONE

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.

CACHE CONFIGURATION

Size

Bank 0

Bank 1

TAG

64KB

(4) 8K x 8

(4) 8K x 8

(1) 8K x 8

256KB

(4) 32K x 8

(4) 32K x 8

(1) 32K x 8

CACHE JUMPER CONFIGURATION

Size

JP8

JP9

JP10

JP11

64KB

Open

Open

Open

Open

256KB

Closed

Closed

Closed

Closed

CPU TYPE CONFIGURATION

Type

JP5

JP6

JP7

80486SX

pins 1 & 2 closed

pins 2 & 3 closed

Open

80486DX

pins 2 & 3 closed

pins 1 & 2 closed

Closed