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

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