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Processor

80486SX/80487SX/80486DX/80486DX2

Processor Speed

20/25/33/50/66(internal)MHz

Chip Set

OPTI

Max. Onboard DRAM

32MB

Cache

64/256KB

BIOS

AMI

Dimensions

330mm x 218mm

I/O Options

None

NPU Options

4167

CONNECTIONS

Purpose

Location

Purpose

Location

Reset switch

J19

Speaker

J21

Turbo LED

J20 pins 1 & 2

Power LED & keylock

J22

Turbo switch

J20 pins 3 & 4

USER CONFIGURABLE SETTINGS

Function

Jumper

Position

Battery select internal

W1

Closed

Battery select external

W1

Open

CMOS memory normal operation

W2

pins 1 & 2 closed

CMOS memory clear

W2

pins 2 & 3 closed

Bus speed select ATCLK/8

W3

pins 1 & 2 closed

Bus speed select ATCLK/6

W3

pins 2 & 3 closed

Monitor type select color

W12

pins 1 & 2 closed

Monitor type select monochrome

W12

pins 2 & 3 closed

Factory configured - do not alter

W13

Open

DRAM CONFIGURATION

Size

Bank 0

Bank 1

1MB

(4) 256K x 9

NONE

2MB

(4) 256K x 9

(4) 256K x 9

4MB

(4) 1M x 9

NONE

5MB

(4) 1M x 9

(4) 256K x 9

8MB

(4) 1M x 9

(4) 1M x 9

16MB

(4) 4M x 9

NONE

17MB

(4) 4M x 9

(4) 256K x 9

20MB

(4) 4M x 9

(4) 1M x 9

32MB

(4) 4M x 9

(4) 4M x 9

CACHE CONFIGURATION

Size

Bank 0

TAG (U29)

TAG (U34)

64KB

(8) 8K x 8

NONE

(1) 8K x 8

256KB

(8) 32K x 8

(1) 16K x 1

(1) 32K x 8

CACHE JUMPER CONFIGURATION

Size

W8

W9

W10

64KB

pins 2 & 3 closed

pins 2 & 3 closed

pins 2 & 3 closed

256KB

pins 1 & 2 closed

pins 1 & 2 closed

pins 1 & 2 closed

CPU TYPE CONFIGURATION

Type

Oscillator

W4

W5

W6

W7

80486SX 20MHz

40MHz

2 & 3

2 & 3

Open

Open

80486DX 25MHz

50MHz

2 & 3

1 & 2

1 & 2

2 & 3

80486DX 33MHz

66.6MHz

2 & 3

1 & 2

1 & 2

2 & 3

80486DX 50MHz

50MHz

1 & 2

1 & 2

1 & 2

2 & 3

80486DX 50MHz

100MHz

2 & 3

1 & 2

1 & 2

2 & 3

80486DX2 50MHz

50MHz

1 & 2

1 & 2

1 & 2

2 & 3

Note:Pins designated should be in the closed position.