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486SX/DX/DX2

UNIDENTIFIED

486SX/DX/DX2

Processor

80486SX/80487SX/ODP80486SX/80486DX/80486DX2

Processor Speed

16/20/25/33/50/55i/66iMHz

Chip Set

OPTI

Max. Onboard DRAM

32MB

Cache

64/128KB

BIOS

AMI

Dimensions

330mm x 218mm

I/O Options

None

NPU Options

None

CONNECTIONS

Purpose

Location

Purpose

Location

External battery

J1

Turbo LED

J4

Speaker

J2

Turbo switch

J5

Power LED & keylock

J3

Reset switch

J6

USER CONFIGURABLE SETTINGS

Function

Jumper

Position

Monitor type select color

JP1

Closed

 

Monitor type select monochrome

JP1

Open

Factory configured - do not alter

JP4

N/A

Factory configured - do not alter

JP5

N/A

Factory configured - do not alter

JP6

N/A

Factory configured - do not alter

JP8

N/A

Power on clock select CLKI/4

JP9

pins 1 & 2 closed

 

Power on clock select CLKI/6

JP9

pins 2 & 3 closed

CMOS memory normal operation

JP10

pins 2 & 3 closed

 

CMOS memory clear

JP10

pins 1 & 2 closed

Factory configured - do not alter

JP12

N/A

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

CACHE CONFIGURATION

Size

Bank 0

Bank 1

TAG0

TAG1

64KB

(4) 8K x 8

(4) 8K x 8

(1) 8K x 8

(1) 16K x 4

128KB

(4) 32K x 8

(4) 32K x 8

(1) 8K x 8

(1) 16K x 4

CACHE JUMPER CONFIGURATION

Size

JP2

JP3

JP7

64KB

pins 1 & 2 closed

pins 1 & 2 closed

pins 1 & 2 closed

128KB

pins 2 & 3 closed

pins 2 & 3 closed

pins 2 & 3 closed

CPU TYPE CONFIGURATION

Type

JP13

JP14

80486SX

pins 2 & 3 closed

pins 2 & 3 closed

80486DX

pins 1 & 2 closed

pins 1 & 2 closed

80486DX2

pins 1 & 2 closed

pins 1 & 2 closed

CPU SPEED CONFIGURATION

Speed

JP11

25MHz

pins 2 & 3 closed

33MHz

pins 2 & 3 closed

40MHz

pins 1 & 2 closed

50iMHz

pins 1 & 2 closed

66iMhz

pins 2 & 3 closed