HwMuseum | Index

PACKARD BELL

PB400/401T

Processor

80486SX/80487SX/80486DX/ODP486SX/80486DX2

Processor Speed

16/20/25/33/50(internal)/66(internal)MHz

Chip Set

OPTI

Max. onboard DRAM

6MB (82C495 AT U77) OR 18MB (82C495B1 AT U77)

Cache

64/128/256KB

BIOS

Phoenix

Dimensions

330mm x 218mm

I/O Options

Fax/modem daughterboard, floppy drive interface, game port, IDE interface, multi-function connector (IDE interface LED, keylock, reset, SW_MODLR, Turbo LED), parallel port, PS/2 keyboard port, PS/2 mouse port, serial port, VGA feature connector, VGA port

NPU Options

None

CONNECTIONS

Purpose

Location

Purpose

Location

PS/2 keyboard

J1

Keyboard lock

J19

PS/2 mouse

J2

Fax/modem daughterboard

J21

VGA port

J3

IDE interface

J25

Game port

J4

Floppy drive interface

J27

Parallel port

J5

External speaker connector

J28

Serial port B

J6

Multi-function connector

J32

External battery

J7

CPU/chassis fan power (+12VDC)

J33

VGA feature connector

J13

Riser card

S1

USER CONFIGURABLE SETTINGS

Function

Jumper

Position

»

Internal battery enabled

J8

Closed

 

Internal battery disabled

J8

Open

»

Onboard Game port enabled

J12

pins 2 & 3 closed

 

Onboard Game port disabled

J12

pins 1 & 2 closed

»

Monitor type select color

J16

Closed

 

Monitor type select monochrome

J16

Open

»

PS/2 mouse port enabled

J17

Closed

 

PS/2 mouse port disabled

J17

Open

»

Onboard IDE interface enabled

J24

pins 1 & 2 closed

 

Onboard IDE interface disabled

J24

pins 2 & 3 closed

»

Onboard floppy drive interface enabled

J26

pins 1 & 2 closed

 

Onboard floppy drive interface disabled

J26

pins 2 & 3 closed

»

Onboard speaker enabled

J29

pins 1 & 2 closed

 

Onboard speaker disabled

J29

pins 2 & 3 closed

DRAM CONFIGURATION

Size

Bank 0

Bank 1

Bank 2

U77

2MB

(8) 41256

(8) 41256

NONE

Either

6MB

(8) 41256

(8) 41256

(4) 1M x 9

Either

18MB

(8) 41256

(8) 41256

(4) 4M x 9

82C495B1 ONLY

Note:256K x 9 SIMMs are not supported. 18MB configuration requires OPTI 82C495B1 DRAM controller. Banks 0 and 1 are soldered to the board and should not be altered.

VIDEO CONFIGURATION

Mode

J10

J14

VGA port (J3)

pins 1 & 2 closed

Closed

VGA feature connector (J13)

pins 1 & 2 closed

Open

Disabled

pins 2 & 3 closed

N/A

VRAM CONFIGURATION

Size

Bank 0

Bank 1

512KB

(4) 44256

NONE

1024KB

(4) 44256

(4) 44256

Note:If Bank 1 sockets are omitted from board, board was factory installed with 1MB of VRAM. Bank 0 is soldered to the board and should not be altered.

SERIAL PORT CONFIGURATION

Modem (J21)

Port B (J5)

ISA Modem

J18

J20

J101/JMOD *

Disabled

COM2

None

N/A

pins 1 & 2

Closed

Disabled

COM2

COM1

pins 2 & 3

pins 1 & 2

Closed

Disabled

COM2

COM3

pins 1 & 2

pins 1 & 2

Closed

COM1

COM2

None

pins 1 & 2

pins 1 & 2

Open

COM3

COM2

None

pins 2 & 3

pins 1 & 2

Open

Disabled

COM4

None

N/A

pins 2 & 3

Closed

Disabled

COM4

COM1

pins 2 & 3

pins 2 & 3

Closed

Disabled

COM4

COM3

pins 1 & 2

pins 2 & 3

Closed

COM1

COM4

None

pins 1 & 2

pins 2 & 3

Open

COM3

COM4

None

pins 2 & 3

pins 2 & 3

Open

Note:* JMOD is a special block placed on J21, connecting pins 10 and 11 together diagonally.


PARALLEL PORT CONFIGURATION

LPT

IRQ

J22

J23

»

LPT1

IRQ7

pins 1 & 2 closed

pins 1 & 2 closed

 

LPT1

IRQ5

pins 1 & 2 closed

pins 2 & 3 closed

 

LPT2

IRQ7

pins 2 & 3 closed

pins 1 & 2 closed

 

LPT2

IRQ5

pins 2 & 3 closed

pins 2 & 3 closed

CPU TYPE CONFIGURATION

CPU

J30/1 & 2

J30/3 & 4

J30/5 & 6

J30/7 & 8

J30/9&10

J31

J34

80486SX

Open

Closed

Open

Open

Open

Open

Open

80487SX

Closed

Open

Closed

Open

Closed

Open

Open

80486DX

Closed

Open

Closed

Closed

Open

Open

Open

ODP486SX

Closed

Open

Closed

Closed

Open

Closed

Closed

80486DX2

Closed

Open

Closed

Closed

Open

Open

Closed

CPU SPEED CONFIGURATION

Speed

J35/pins 1 & 2

J35/pins 3 & 4

16MHz

Closed

Closed

20MHz

Open

Closed

25MHz

Closed

Open

33MHz

Open

Open

CACHE CONFIGURATION

Size

Cache

Location

TAG (U81)

Dirty Bit (U84)

64KB

(8) 8K x 8

Banks 0 & 1

(1) 32K x 8

(1) 64K x 1

128KB

(4) 32K x 8

Bank 0

(1) 32K x 8

(1) 64K x 1

256KB

(8) 32K x 8

Banks 0 & 1

(1) 32K x 8

(1) 64K x 1

CACHE JUMPER CONFIGURATION

Size

J36/1 & 2

J36/3 & 4

J36/5 & 6

J36/7 & 8

J36/9 & 10

»

Disabled

Open

Open

Open

Open

Open

 

64KB

Open

Open

Open

Open

Open

 

128KB

Closed

Open

Closed

Closed

Open

 

256KB

Closed

Closed

Closed

Open

Closed