Packard Bell 640 M/Board

640 Motherboard Diagram

The on-board video chip of your computer will automatically be disabled by the installation of a separate video card.

Specification

Jumpers

JumperDescriptionSettingDesignation
J5J1Host Bus Speed1-2,4-5
1-2,5-6
2-3,4-5
50MHz
60MHz
66MHz
J5J2CPU Clock Ratio1-2,4-5
2-3,4-5
2-3,5-6
1-2,5-6
x1.5
x2.0
x2.5
x3.0
J4K2CMOS Clear1-2
2-3
Normal
Clear
J4K2Password Clear4-5
5-6
Enabled
Clear/Disabled
J4K1ISA Clock Speed Override  1-2
2-3
1/3 PCI Clock
1/4 PCI Clock
J4K1CMOS Setup Access4-5
5-6
Enabled
Access Denied
J6A2Process Voltage1-2
2-3
Standard Voltage
VRE
J9C1Boot Select1-2
2-3
Normal
Recover

Battery

This 3V Lithium clip in battery is replaceable with a CR2032 battery.

Flash Bios Update

Bios Upgrade Procedure

Bios Upgrade Procedure

Cache Upgrade

This motherboard may come configured with a CELP socket. This socket supports 256K COAST modules for upgrading the external cache. If there is no CELP socket the motherboard will be configured with 256K cache soldered on board already at locations U2E1, U2E2, U3E1, U3E2, U2D1, U2D2, U3D1, U3D2).

To install cache memory on the motherboard, a 256kB COAST module is required.There are two COAST module configurations supported:

CPU Upgrades

This motherboard can accommodate the Intel Pentium P75, P90, P100, P120, P133, P150, P166 and P200MHz, and the 150, 166, 180 and 200MHz Intel Pentium Overdrive Processor (MMX).

The upgrade processor installs in the Zero Insertion Force (ZIF) Socket. (U3B1). In the table below you can find the correct jumper settings for each processor:

CPU SpeedClock Speed (J5J1)  CPU Multiplier (J5J2)  Host Bus Speed
75 MHz1-2, 4-51-2, 4-5(x 1.5)50 MHz
90 MHz1-2, 5-61-2, 4-5(x 1.5)60 MHz
100 MHz2-3, 4-51-2, 4-5(x 1.5)66 MHz
120 MHz1-2, 5-62-3, 4-5(x 2.0)60 MHz
133 MHz2-3, 4-52-3, 4-5(x 2.0)66 MHz
150 MHz1-2, 5-62-3, 5-6(x 2.5)60 MHz
166 MHz2-3, 4-52-3, 5-6(x 2.5)66 MHz
*200 MHz2-3, 4-51-2, 5-6(x 3.0)66 MHz
**MMX 150 Overdrive1-2, 5-61-2, 4-560 MHz
** MMX 166 Overdrive2-3, 4-51-2, 4-566 MHz
** MMX 180 Overdrive1-2, 5-62-3, 5-660 MHz
** MMX 200 Overdrive2-3, 4-52-3, 5-666 MHz

*200 Mhz CPU Upgrade is only possible with Motherboards 181416 or 181426, and Sound Cards other than 030107 or 030101.

** The Pentium Overdrive Processor with MMX technology, is equipped with an on-package voltage regulation, which adapts the 3.3V system voltage to 2.8V processor voltage.

ISA Clock Speed Override (J4K1) should be set to 1-2 for the Pentium 75 and 2-3 for all other processors.

Note - If you wish to install an Intel MMX Overdrive processor, it may be necessary to have BIOS version 1.00.07 CP0R and at least 16MB of RAM installed. The current BIOS version will appear on the screen immediately after switching on the computer.

RAM Upgrades


Video Memory Upgrade

You can upgrade the video memory on your system to 2MB by using 256Kx16-70 ns SOJ DRAM chips.You will need two of these chips to perform the upgrade.