DELL COMPUTER CORPORATION

XPS 486 MIDSIZE

Processor

80486DX2/80486DX4

Processor Speed

66(internal)/100(internal)MHz

Chip Set

Micronics

Max. Onboard DRAM

64MB

Cache

256KB

BIOS

Unidentified

Dimensions

330mm x 218mm

I/O Options

32-bit VESA local bus slots (2), floppy drive interface, IDE interface, parallel port, PS/2 mouse port, serial ports (2)

NPU Options

None

CONNECTIONS

Purpose

Location

Purpose

Location

Serial port 1

CN1

IDE interface LED

J1

Serial port 2

CN2

Power LED & keylock

J2

PS/2 mouse port

CN3

Reset switch

J3

Parallel port

CN4

Speaker

J4

Floppy drive interface

CN5

Turbo switch

J5

IDE interface 1

CN6

Turbo LED

J6

IDE interface 2

CN7

32-bit VESA Local bus slots

SL1 & SL2

USER CONFIGURABLE SETTINGS

Function

Jumper

Position

»

Factory configured - do not alter

W1

Closed

»

Monitor type select color

W2

Closed

 

Monitor type select monochrome

W2

Open

»

Mouse IRQ12 enabled

W3

Closed

 

Mouse IRQ12 disabled

W3

Open

»

CMOS memory clear

W5

Closed

 

CMOS memory normal operation

W5

Open

»

Factory configured - do not alter

W8

pins 2 & 3 closed

»

Factory configured - do not alter

W10

pins 2 & 3 closed

»

Factory configured - do not alter

W11

pins 2 & 3 closed

»

CPU type select - Intel DX/DX2/DX4/Pentium Overdrive

W12

pins 1 & 2 closed

 

CPU type select - Intel SX

W12

pins 2 & 3 closed

»

Factory configured - do not alter

W13

Open

»

Factory configured - do not alter

W16

pins 2 & 3 closed

»

Factory configured - do not alter

W17

pins 2 & 3 closed

»

Factory configured - do not alter

W18

Open

»

Factory configured - do not alter

W19

pins 2 & 3 closed

»

Factory configured - do not alter

W22

pins 2 & 3 closed

»

Factory configured - do not alter

W23

pins 2 & 3 closed

»

Factory configured - do not alter

W24

pins 2 & 3 closed

»

Factory configured - do not alter

W25

Open

»

IDE port 1 enabled

W34

pins 1 & 2 closed

 

IDE port 1 disabled

W34

pins 2 & 3 closed

 

Factory configured - do not alter

W35

Open

»

Parallel port type select IRQ7

W36

pins 1 & 2 closed

 

Parallel port type select IRQ5

W36

pins 2 & 3 closed

»

Factory configured - do not alter

W39

Open

»

Factory configured - do not alter

W40

Open

»

Factory configured - do not alter

SW1/1

On

»

Factory configured - do not alter

SW1/2

On

»

Factory configured - do not alter

SW1/3

Off

»

Factory configured - do not alter

SW1/4

Off

Note: The location of the factory configured jumpers is unidentified.

DRAM CONFIGURATION

Size

Bank 0

Bank 1

Bank 2

Bank 3

4MB

(1) 1M x 36

NONE

NONE

NONE

8MB

(1) 1M x 36

(1) 1M x 36

NONE

NONE

12MB

(1) 1M x 36

(1) 1M x 36

(1) 1M x 36

NONE

16MB

(1) 1M x 36

(1) 1M x 36

(1) 1M x 36

(1) 1M x 36

16MB

(1) 4M x 36

NONE

NONE

NONE

20MB

(1) 1M x 36

(1) 4M x 36

NONE

NONE

24MB

(1) 1M x 36

(1) 1M x 36

(1) 4M x 36

NONE

32MB

(1) 4M x 36

(1) 4M x 36

NONE

NONE

36MB

(1) 1M x 36

(1) 4M x 36

(1) 4M x 36

NONE

40MB

(1) 1M x 36

(1) 1M x 36

(1) 4M x 36

(1) 4M x 36

48MB

(1) 4M x 36

(1) 4M x 36

(1) 4M x 36

NONE

64MB

(1) 4M x 36

(1) 4M x 36

(1) 4M x 36

(1) 4M x 36

DMA CHANNEL CONFIGURATION

DMA Channel

W37

W38

1

pins 1 & 2 closed

pins 1 & 2 closed

3

pins 2 & 3 closed

pins 2 & 3 closed