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80486SX/DX MOTHERBOARD

UNIDENTIFIED

80486SX/DX MOTHERBOARD

Processor

80486SX/80487SX/80486DX

Processor Speed

16/20/25/33MHz

Chip Set

Acer

Max. Onboard DRAM

32MB

SRAM Cache

None

BIOS

AMI/AWARD

Dimensions

230mm x 220mm

I/O Options

None

NPU Options

None

CONNECTIONS

Purpose

Location

Purpose

Location

External battery

J4

Turbo LED

J21/pins 1 & 2

Reset switch

J19

Turbo switch

J21/pins 4 & 5

Speaker

J20

Power LED & keylock

J22

USER CONFIGURABLE SETTINGS

Function

Jumper

Position

Monitor type select color

JP1

pins 2 & 3 closed

 

Monitor type select monochrome

JP1

pins 1 & 2 closed

I/O BUS SPEED CONFIGURATION

Jumper

OSC1/5

OSC1/6

OSC1/8

JP3

pins 2 & 3 closed

pins 1 & 2 closed

pins 1 & 2 closed

JP6

pins 1 & 2 closed

pins 2 & 3 closed

pins 1 & 2 closed

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

8MB

(4) 1M x 9

(4) 1M x 9

16MB

(4) 4M x 9

NONE

32MB

(4) 4M x 9

(4) 4M x 9

CPU JUMPER CONFIGURATION

CPU

JP4

JP5

80486SX

open

pins 1 & 2 closed

80487SX

pins 1 & 2 closed

pins 2 & 3 closed

80486DX

pins 2 & 3 closed

pins 2 & 3 closed