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Packard Bell 450 M/Board

450 board diagram

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

JumperFunctionSettingDescription
J8 Color/Mono selectClosed
Open
* Colour
Monochrome
J9 Video IRQ enableClosed
Open
* Enabled
Disabled
J10 Password clearClosed
Open
Clear Password
* Normal Operation
J11Onboard game port selectClosed
Open
* Enabled
Disabled
** J15 / J16ECP DMA select1-2
2-3
* DMA Channel 1
DMA Channel 2
J17 Boot Select1-2
2-3
Boot Block
* Normal
J18 Parity Enable1-2
2-3
Enabled
* Disabled
J19 Onboard VGA Enable1-2
2-3
Disabled
* Enabled
J20 Onboard I/O Controller1-2
2-3
Disabled
* Enabled
J25 CPU Speed select 1-2
2-3
25MHz
33MHz
J26 Cache size selectionOpen
1-2,
3-4
0K
128K
512K
J28 P24T or S-series reset control1-2
2-3
* P24T
S-series CPU Standard CPU
(Do Not Change to add P24)
J29 P24C Clock multiplier1-2
2-3
Open
Other Multiplier
X2 Internal clock
X3 Internal clock
J30 Onboard battery enableOpen
3-4
Use external battery
* Use internal battery
J31 SX processor selection1-2 3-4
5-6
All except (SX)
SX
J32 J(3.3v) (CPU voltage) 1-3 2-4
3-5 4-6
3.3V CPU
* 5.0V CPU
J33 LDEV bypassOpen
Closed
Disabled
Enabled
J36 Onboard speaker enableOpen
3-4
External speaker
* Internal speaker
J37 Onboard memory DisableOpen
Closed
* Enabled
Disabled

* 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.

 J26
NoneOpen
128kOpen
512kClosed

CPU Upgrades

Jumpers J25J29J31
CPUSpeedMultiplierSX/DX
486SX251-21-25-6
486SX332-31-25-6
486SX/2-501-22-35-6
486DX-332-31-21-2 & 3-4
486DX/2-50
486-25
486DX/4-75
P24T-62MHz
1-22-31-2 & 3-4
486DX/2-66
ODP486-33
P24T-83MHz
2-32-31-2 & 3-4
486DX/4-1002-3none1-2 & 3-4
  • The motherboard DOES NOT support any 3.3 Volt CPUís, 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 ZIPís.
  • You will need two of these to perform the upgrade.