packard bell 450 Motherboard Instruction Manual

: June 13, 2024
: packard bell

Table of Contents

packard bell 450 Motherboard
Product Information
Product Usage Instructions
PRODUCT OVERVIEW
Specification
Jumpers
Battery
Cache Upgrade
CPU Upgrades
Memory Upgrades
Speaker
Video Memory Upgrade
References
Read User Manual Online (PDF format)
Download This Manual (PDF format)

packard bell 450 Motherboard

packard-bell-450-Motherboard-fig-1

Product Information

The Packard Bell 450 Motherboard is a motherboard designed for use in Packard Bell computers. It features a 3.0V DC Lithium battery soldered on the motherboard, a Phoenix v4.03 X1.1A BIOS, and an ISA based system bus.
The motherboard comes with 4 MB of standard RAM, with a maximum capacity of 64 MB. It also includes various interfaces such as 1 DB-25F Parallel port, 1 RS232 DB-9M Serial port, 1 15-pin HDF VGA port, 1 PS/2 Mouse port, and 1 PS/2 Keyboard port. The motherboard has a built-in Cirrus Logic 5428 or 5429 video.
Additionally, the motherboard has various jumpers that can be set to customize its functionality. These jumpers control features such as color/mono select, video IRQ enable, password clear, onboard game port select, ECP DMA select, boot select, parity enable, onboard VGA enable, onboard I/O controller, CPU speed select, cache size selection, P24T or S-series reset control, P24C clock multiplier, SX processor selection, J(3.3v) (CPU voltage), LDEV bypass, onboard speaker enable, and onboard memory disable.
The motherboard also provides instructions for battery usage, cache upgrade, CPU upgrades, memory upgrades, and speaker usage.

Product Usage Instructions

Battery Usage
Use a 3 volt lithium battery. Remove the jumpers on pins 3-4 of the J30 (Jbte) battery connector. The battery will connect to pins 1 and 4 (pin 1= +3 volts, pin 4= ground).

Cache Upgrade
The Cache and TAG RAM are either 28-pin for 128KB of cache or 32-pin for 512KB of cache. The jumper J26 determines the cache size. None open indicates no cache, open 128k indicates 128KB cache, and open 512k indicates 512KB cache.

CPU Upgrades
The CPU upgrades can be done using various jumpers. J25 controls the CPU speed, J29 controls the CPU multiplier, and J31 controls the SX/DX processor selection. The table provided in the user manual specifies the jumper settings for different CPU upgrades.

Memory Upgrades
The user manual does not provide specific instructions for memory upgrades. It is recommended to refer to the manufacturer’s guidelines or consult technical support for Packard Bell computers.

Speaker Usage
Use an 8 ohm, .5 watt computer speaker. Remove the jumper on pins 3-4 of the J36 (Jspk) connector. The Speaker will connect to pins 1 and 4 (pin 1= +5 volts, pin 4= speaker ground).

PRODUCT OVERVIEW

packard-bell-450-Motherboard-fig-2

Specification

Battery : 3.0V DC Lithium soldered on motherboard.
BIOS : Phoenix v4.03 X1.1A
Bus Architecture : ISA based system bus.
Cache : Write Back: 8 KB Internal (Level 1) Cache External (Level 2).
CPU : Intel 486 processor.
Interfaces :
- 1 DB-25F Parallel.
- 1 RS232,DB-9M Serial.
- 1 15-pin HDF VGA.
- 1 PS/2 Mouse.
- 1 PS/2 Keyboard.
RAM : 4 MB Standard on Motherboard 64 MB Maximum on Motherboard.
Speaker : Piezoelectric soldered on motherboard.
UART : Compatability Compatible with the 16C550 UART.
Video : Built in Cirrus Logic 5428 or 5429.

Jumpers

packard-bell-450-Motherboard-fig-3 packard-
bell-450-Motherboard-fig-4

Indicates default value.
J15 and J16 must match

Battery

Use a 3 volt lithium battery. Remove the jumpers on pins 3-4 of the J30 (Jbte) battery connector. The battery will connect to pins 1 and 4 (pin 1= +3 volts, pin 4= ground)

Cache Upgrade

The Cache and TAG RAM are either 28-pin for 128KB of cache, or 32-pin for 512KB of cache.

CPU Upgrades

The motherboard DOES NOT support any 3.3 Volt CPU’s, regardless of motherboard revision.
The upgrade processor installs in the Zero Insertion Force (ZIF) socket at location U50.
Jumper J29 is not available on all systems.
If you wish to upgrade the processor with an Intel P24T (Pentium Overdrive), the Interposer is required. An Interposer can be obtained from Intel or from the dealer. Please note that the Interposer will disable the 2nd level cache.
For the P24T-83, you may also need to update the BIOS to version 1.1a. The current BIOS version appears on the display immediately after starting up.

Memory Upgrades

This motherboard does not accept EDO memory.
SIMM speed must be 70 or 80ns. 60ns SIMMS will only work if the on-board memory is disabled.
The SIMMS are 72-pin, non-parity (32 bit) because the motherboard design does not require parity checking. The parity jumper does not have to be changed.
Use silver plated SIMMS.
The board comes with 4MB soldered onto the motherboard (SMT), and will take 4/8/16/32 MB SIMMs up to a maximum of 64MB.
When two 32 MB SIMMS are installed, the SMT memory needs to be disabled. This is done by jumping J37 (On Board Memory Disable).

Speaker

Use an 8 ohm, .5 watt computer speaker. Remove the jumper on pins 3-4 of the J36 (Jspk) connector.
The Speaker will connect to pins 1 and 4. (pin 1= =5 volts, pin 4=speaker ground).

Video Memory Upgrade

You can upgrade the video memory on your system from 1MB to 2MB by using 256Kx16 (Symmetrical, CAS line) DRAM ZIP’s.
You will need two of these to perform the upgrade.