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Precision 486SX/25, Precision 486DX/33

DELL COMPUTER CORPORATION

Precision 486SX/25, Precision 486DX/33

Processor

80486SX/80487SX/80486DX

Processor Speed

25/33MHz

Chip Set

OPTI

Max. Onboard DRAM

32MB

Cache

64/256KB

BIOS

AMI

Dimensions

330mm x 218mm

I/O Options

None

NPU Options

None

CONNECTIONS

Purpose

Location

Purpose

Location

Reset switch

J9

Speaker

J21

External battery

J18

Power LED & keylock

J22

Turbo switch

J20

   

Note:Although there is a 4167 socket on the board, it is not supported. (As per the manufacturer)

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

CPU speed select ATCLK/4

W3

pins 2 & 3 closed

 

CPU speed select ATCLK/6

W3

pins 1 & 2 closed

Factory configured - do not alter

W8

Open

Factory configured - do not alter

W9

Open

Factory configured - do not alter

W10

Open

Monitor type select color

W12

pins 1 & 2 closed

 

Monitor type select monochrome

W12

pins 2 & 3 closed

Factory test disabled

W13

Open

 

Factory test enabled

W13

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

5MB

(4) 1M x 9

(4) 256K x 9

8MB

(4) 1M x 9

(4) 1M x 9

16MB

(4) 4M x 9

NONE

20MB

(4) 4M x 9

(4) 256K x 9

32MB

(4) 4M x 9

(4) 1M x 9

CACHE CONFIGURATION

Size

Bank 0

64KB

(8) 8K x 8

256KB

(8) 32K x 8

CACHE JUMPER CONFIGURATION

Size

W8

W9

W18

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

W5

W6

W7

80486SX

pins 2 & 3 closed

pins 2 & 3 closed

Open

80487SX

pins 1 & 2 closed

pins 1 & 2 closed

pins 1 & 2 closed

80486DX

pins 1 & 2 closed

pins 1 & 2 closed

pins 2 & 3 closed