HwMuseum | Index

UNIDENTIFIED

80486

Processor

80486SX/80487SX/ODP486SX/80486DX/80486DX2

Processor Speed

20/25/33/40/50(internal)/66(internal)MHz

Chip Set

OPTI

Max. Onboard DRAM

32MB

Cache

None

BIOS

AMI

Dimensions

254mm x 218mm

I/O Options

None

NPU Options

None

CONNECTIONS

Purpose

Location

Purpose

Location

Power LED & keylock

J17

External battery

J20

Speaker

J18

Turbo switch

J21

Reset switch

J19

Turbo LED

J22

USER CONFIGURABLE SETTINGS

Function

Jumper

Position

»

CPU type select PGA or PQFP installed

J23

Open

 

CPU type select PQFP disabled & PGA enabled

J23

Closed

»

Monitor type select monochrome

JP3

Open

 

Monitor type select color/EGA/VGA

JP3

Closed

»

CMOS memory normal operation

JP5

pins 1 & 2 closed

 

CMOS memory clear

JP5

pins 2 & 3 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

5MB

(4) 256K x 9

(4) 1M x 9

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 TYPE CONFIGURATION

Type

JP101

JP102

JP103

JP104

80486SX

Open

pins 2 & 3 closed

Open

pins 2 & 3 closed

80487SX

Closed

pins 1 & 2 closed

pins 2 & 3 closed

pins 2 & 3 closed

ODP486SX

Closed

pins 1 & 2 closed

pins 2 & 3 closed

pins 2 & 3 closed

80486DX/DX2

Closed

pins 1 & 2 closed

pins 1 & 2 closed

pins 2 & 3 closed

CPU SPEED CONFIGURATION

Speed

J24

J25

J26

20MHz

Open

Closed

Closed

25MHz

Closed

Open

Closed

33MHz

Closed

Closed

Open

50iMHz

Closed

Open

Closed

66iMHz

Closed

Closed

Open