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SYSTEM 486P Motherboard Settings and Configuration






DELL COMPUTER CORPORATION

SYSTEM 486P

Processor

80486DX

Processor Speed

16/20/25/33MHz

Chip Set

VLSI

Max. Onboard DRAM

64MB

Cache

None

BIOS

Phoenix

Dimensions

349mm x 185mm

I/O Options

Bus mouse port, floppy interface, IDE interface, parallel port, riser card slot, serial ports (2), video upgrade socket, VGA port

NPU Options

None

CONNECTIONS

Purpose

Location

Purpose

Location

16-bit riser card

EXP1

Auxiliary ground points

GND

IDE interface LED

JHDLED

IDE interface

JIDE

External battery

JBAT

Power LED & turbo LED

JLED

Serial port 1

JCOM1

Parallel port

JLPT1

Serial port 2

JCOM2

Bus mouse port

JMOUSE

Cooling fan power

JFAN

VGA memory upgrade socket

JVDB

VGA pass-through

JFEAT

Front panel status LCD

JVIEW

Floppy drive interface

JFLOP

VGA port

JVGA

USER CONFIGURABLE SETTINGS

Function

Jumper

Position

»

VGA interrupt request select none

JP5 pins 1 & 2

Closed

 

VGA interrupt request select IRQ9

JP5 pins 1 & 2

Open

»

Monitor type select color

JP5 pins 3 & 4

Closed

 

Monitor type select monochrome

JP5 pins 3 & 4

Open

»

Factory configured - do not alter

JP5 pins 5 & 6

Open

»

Factory configured - do not alter

JP5 pins 7 & 8

Open

»

Password check enabled

JP5 pins 9 & 10

Closed

 

Password check disabled

JP5 pins 9 & 10

Open

»

Mouse port enabled (uses IRQ12)

JP5 pins 11 & 12

Closed

 

Mouse port disabled (IRQ12 not used)

JP5 pins 11 & 12

Open

»

IOCHRDY signal disabled to IDE drive(s)

JP5 pins 13 & 14

JP5 pins 15 & 16

Closed

Open

 

IOCHRDY signal enabled to IDE drive(s)

JP5 pins 13 & 14

JP5 pins 15 & 16

Open

Closed

»

Bus wait states select none

JP5 pins 17 & 18

Closed

 

Bus wait state select one

JP5 pins 17 & 18

Open

»

Factory configured - do not alter

JP5 pins 19 & 20

Open

»

Factory configured - do not alter

CLRB

Open

DRAM CONFIGURATION

Size

Bank 0

Bank 1

Bank 2

Bank 3

1MB

(1) 256K x 36

NONE

NONE

NONE

2MB

(1) 256K x 36

(1) 256K x 36

NONE

NONE

3MB

(1) 256K x 36

(1) 256K x 36

(1) 256K x 36

NONE

4MB

(1) 256K x 36

(1) 256K x 36

(1) 256K x 36

(1) 256K x 36

4MB

(1) 1M x 36

NONE

NONE

NONE

5MB

(1) 1M x 36

(1) 256K x 36

NONE

NONE

6MB

(1) 1M x 36

(1) 256K x 36

(1) 256K x 36

NONE

7MB

(1) 1M x 36

(1) 256K x 36

(1) 256K x 36

(1) 256K x 36

8MB

(1) 1M x 36

(1) 1M x 36

NONE

NONE

9MB

(1) 1M x 36

(1) 1M x 36

(1) 256K x 36

NONE

10MB

(1) 1M x 36

(1) 1M x 36

(1) 256K x 36

(1) 256K x 36

12MB

(1) 1M x 36

(1) 1M x 36

(1) 1M x 36

NONE

13MB

(1) 1M x 36

(1) 1M x 36

(1) 1M x 36

(1) 256K x 36

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

17MB

(1) 4M x 36

(1) 256K x 36

NONE

NONE

18MB

(1) 4M x 36

(1) 256K x 36

(1) 256K x 36

NONE

19MB

(1) 4M x 36

(1) 256K x 36

(1) 256K x 36

(1) 256K x 36

20MB

(1) 4M x 36

(1) 1M x 36

NONE

NONE

21MB

(1) 4M x 36

(1) 1M x 36

(1) 256K x 36

NONE

22MB

(1) 4M x 36

(1) 1M x 36

(1) 256K x 36

(1) 256K x 36

24MB

(1) 4M x 36

(1) 1M x 36

(1) 1M x 36

NONE

DRAM CONFIGURATION (CON’T)

Size

Bank 0

Bank 1

Bank 2

Bank 3

25MB

(1) 4M x 36

(1) 1M x 36

(1) 1M x 36

(1) 256K x 36

28MB

(1) 4M x 36

(1) 1M x 36

(1) 1M x 36

(1) 1M x 36

32MB

(1) 4M x 36

(1) 4M x 36

NONE

NONE

33MB

(1) 4M x 36

(1) 4M x 36

(1) 256K x 36

NONE

34MB

(1) 4M x 36

(1) 4M x 36

(1) 256K x 36

(1) 256K x 36

36MB

(1) 4M x 36

(1) 4M x 36

(1) 1M x 36

NONE

37MB

(1) 4M x 36

(1) 4M x 36

(1) 1M x 36

(1) 256K x 36

40MB

(1) 4M x 36

(1) 4M x 36

(1) 1M x 36

(1) 1M x 36

48MB

(1) 4M x 36

(1) 4M x 36

(1) 4M x 36

NONE

49MB

(1) 4M x 36

(1) 4M x 36

(1) 4M x 36

(1) 256K x 36

52MB

(1) 4M x 36

(1) 4M x 36

(1) 4M x 36

(1) 1M x 36

64MB

(1) 4M x 36

(1) 4M x 36

(1) 4M x 36

(1) 4M x 36

CPU SPEED CONFIGURATION

Speed

JP1

JP2

JP3

JP4

16MHz

Closed

Open

Open

Open

20MHz

Open

Closed

Open

Open

25MHz

Open

Open

Closed

Open

33MHz

Open

Open

Open

Closed








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