UNIDENTIFIED

486WB CACHE

Processor

80486SX/80487SX/80486DX

Processor Speed

25/33MHz

Chip Set

OPTI

Max. Onboard DRAM

64MB

Cache

64/128/256/512KB

BIOS

AMI

Dimensions

330mm x 218mm

I/O Options

None

NPU Options

4167

CONNECTIONS

Purpose

Location

Purpose

Location

Speaker

J3

Turbo switch

JP18

External battery

J7

Turbo LED

JP20

Power LED & keylock

J8

Reset switch

JP21

USER CONFIGURABLE SETTINGS

Function

Jumper

Position

»

CPU speed select forced high

JP18

Closed

 

CPU speed select switchable at keyboard

JP18

Open

»

Power good signal detect from power supply

JP23

pins 1 & 2 closed

 

Power good signal detect from board

JP23

pins 2 & 3 closed

»

CMOS memory normal operation

JP24

pins 2 & 3 closed

 

CMOS memory clear

JP24

pins 1 & 2 closed

»

Monitor type select color

JP25

pins 2 & 3 closed

 

Monitor type select monochrome

JP25

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

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

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

16-B

(4) 4M x 9

NONE

NONE

NONE

20MB

(4) 1M x 9

(4) 4M x 9

NONE

NONE

24MB

(4) 1M x 9

(4) 1M x 9

(4) 4M x 9

NONE

28MB

(4) 1M x 9

(4) 1M x 9

(4) 4M x 9

(4) 1M x 9

32MB

(4) 4M x 9

(4) 4M x 9

NONE

NONE

36MB

(4) 1M x 9

(4) 4M x 9

(4) 4M x 9

NONE

40MB

(4) 1M x 9

(4) 4M x 9

(4) 4M x 9

(4) 1M x 9

48MB

(4) 4M x 9

(4) 4M x 9

(4) 4M x 9

NONE

52MB

(4) 4M x 9

(4) 4M x 9

(4) 4M x 9

(4) 1M x 9

64MB

(4) 4M x 9

(4) 4M x 9

(4) 4M x 9

(4) 4M x 9

CACHE CONFIGURATION

Size

Bank 0

Bank 1

Bank 2

Bank 3

64KB

(4) 8K x 8

(4) 8K x 8

NONE

NONE

128KB

(4) 8K x 8

(4) 8K x 8

(4) 8K x 8

(4) 8K x 8

256KB

(4) 32K x 8

(4) 32K x 8

NONE

NONE

512KB

(4) 32K x 8

(4) 32K x 8

(4) 32K x 8

(4) 32K x 8

CACHE TAG CONFIGURATION

Size

U27

U36

U37

64KB

(1) 8K x 8

(1) 16K x 8

NONE

128KB

(1) 8K x 8

(1) 16K x 8

NONE

256KB

(1) 32K x 8

NONE

(1) 64K x 8

512KB

(1) 32K x 8

NONE

(1) 64K x 8

CACHE JUMPER CONFIGURATION

Size

JP9

JP10

JP11

JP12

JP13

64KB

2 & 3

2 & 3

2 & 3

2 & 3

2 & 3

128KB

1 & 2

1 & 2

2 & 3

2 & 3

2 & 3

256KB

1 & 2

1 & 2

1 & 2

2 & 3

2 & 3

512KB

1 & 2

1 & 2

1 & 2

1 & 2

1 & 2

Note: Pins designated should be in the closed position.

CPU TYPE CONFIGURATION

Type

JP1

JP2

JP3

80486SX

pins 2 & 3 closed

pins 2 & 3 closed

Open

80487SX

pins 1 & 2 closed

pins 1 & 2 closed

pins 1 & 2 closed

80486DX

pins 1 & 2 closed

pins 1 & 2 closed

pins 2 & 3 closed