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80486

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