PB640 Layout



Note
Installing a video expansion card will automatically disable the on board video controller.
 
 

Sockets
Jumpers
Connectors



PB640 Sockets



Sockets

Description

U4CI PCI Cache, Memory Controller
U4D1 PCI Cache, Memory Controller
U7B1 System I/O Controller PCI ISA Accelerator
U7J1 Ultra I/O Enhanced Controller
U3H1 VGA Graphics Controller
U5H1 Frequency Generator
U9A1 System I/O Command Ports
U3B1 CPU Socket

PB640 Jumpers



Clock Speed (J5J1)

CPU Multiplier (J5J2)

Clock Speed

CPU Speed

1-2, 4-5 1-2, 4-5 (x 1.5) 50MHz 75MHz
1-2, 5-6 1-2, 4-5 (x 1.5) 60MHz 90MHz
2-3, 4-5 1-2, 4-5 (x 1.5) 66MHz 100MHz
1-2, 5-6 2-3, 4-5 (x 2.0) 60MHz 120MHz
2-3, 4-5 2-3, 4-5 (x 2.0) 66MHz 133MHz
1-2, 5-6 2-3, 5-6 (x 2.5) 60MHz 150MHz
2-3, 4-5 2-3, 5-6 (x 2.5) 66MHz 166MHz


Location

Setting

Description

Designation

J5K2 1-2 CMOS Clear Normal
J5K2 2-3 CMOS Clear Clear
J5K2 4-5 Password Clear Password Enabled
J5K2 5-6 Password Clear Password Clear/Disabled
J4K1 1-2 ISA Clock Speed Override 1/3 PCI Clock
J4K1 2-3 ISA Clock Speed Override 1/4 PCI Clock
J4K1 4-5 CMOS Setup Access Enabled
J4K1 5-6 CMOS Setup Access Access Denied
J6A2 1-2 Process Voltage Standard Voltage
J6A2 2-3 Process Voltage VRE


PB640 Connectors



J#

Description

J5K1 Serial Port Connector
J6K1 Serial Port Connector
J3K1 Parallel Port
J8K1 PS/2™ Keyboard Connector
J7K1 PS/2™ Mouse Connector Package
J1K1 VGA Monitor Connector Package
J8E1 Secondary 40-pin header
J9E1 Primary 40-pin header
J8G1 Floppy Connector
J1J1 VESA® Feature Connector Package
J6A1 Fan Speed Control Connector
J8F1 Riser Connector
J6F2 Edge Card Connector
J6F1 SIMM Sockets Bank 0
J7F1 SIMM Sockets Bank 0
J7F2 SIMM Sockets Bank 1
J7F3 SIMM Sockets Bank 1
J1F1 Edge Card Connector
J9E2 Primary Power Connector
J9F1 3.3v Power Connector
J9D1 Soft-Off Power Control
J2A1 Keyboard Lock
J1B1 VRM
J9H2 Midi/Audio
J9D1 J9D1
J9K1 CD Audio
J4A1 Front Panel Connector Sleep Reference
J2A2 Front Panel Connector Sleep Reference
J4A1 IR Port Reference
J4A1 Fan Connector
J4A1 External Speaker Connector
J2A2 Reset Connector
J2A2 Power-On Connector
J2A2 Hard Disk LED Connector
J5J2 CPU Clock Jumpers
J5J1 CPU Clock Jumpers
J5K2 CPU Clock Jumpers
J4K1 CPU Clock Jumpers
J6A2 Processor Voltage


PB640: VGA Port



 
A female DB15 connector built-in on the motherboard.
 

PB640: Parallel Port



 
A female DB25 connector built-in on the motherboard.
 


PB640: External Serial Port



 
A male DB9 connector built-in on the motherboard.
 

PB640: PS/2 Mouse Port



 
A female 6-pin mini DIN connector built-in on the motherboard.
 

PB640: PS/2 Keyboard Port



 
A female 6-pin mini DIN connector built-in on the motherboard.
 

PB640: Clock Speed Jumper J4K1



 
CMOS Setup/ISA Clock Speed Override.
 

PB640: CMOS Password Clear Jumper J5K2



 
CMOS Password Clear.
 

PB640: CPU Clock Ratio Jumper J5J2



 
CPU Clock Ratio Jumper.
 

PB640: Host Bus Speed Jumper J5J1



 
Host Bus Speed Jumper.

Note


PCI clock speed equals 1/2 Host Bus Speed  

PB640: Power Connector (PS1 / PS2) J9E2



 
Power Connector (PS1 / PS2).
 

PB640: BIOS Recovery Jumper J9C1



 
BIOS Recovery Jumper.
 

PB640: J6A2: Processor Voltage



 
Processor Voltage Jumper.

Note


This jumper is reserved. Do not change.
 

PB640: Front Panel Connectors (J2A2 & J4A1)



 
Front Panel Connector Blocks J2A2 & J4A1.

 

PB640: Front Panel Connector Block J2A2



 
Front Panel Connector Block J2A2.

 

PB640: Front Panel Connector Block J4A1



 
Front Panel Connector Block J4A1.

 

PB640: Riser Card Connector



 
This riser can accommodate the following expansion slots configuration:
4 X 4 Case 2 ISA slots
1 PCI slot
1 Combo PCI/ISA slot
Mini Tower 2 ISA slots
2 PCI slots
1 Combo PCI/ISA slot


 

PB640: Floppy Drive Interface (J8G1)



 
A male 2 x 17-pin floppy drive connector.
Capable of supporting up to 2.88 MB capacity floppy drive.

 

PB640: Battery (BT5G1)



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

 

PB640: Primary Hard Drive Interface (J9E1)



 
This male 2 x 20-pin connector is the primary IDE interface.

BIOS supports for:

Type F DMA and AT API Devices
Logical Block Addressing (LBA)
Enhance CHS

Capable of supporting up to PIO Mode 4

 

PB640: Secondary Hard Drive Interface (J8E1)



 
This male 2 x 20-pin connector is the primary IDE interface.

BIOS supports for:

Type F DMA and AT API Devices
Logical Block Addressing (LBA)
Enhance CHS

Capable of supporting up to PIO Mode 4

 

PB640: Flash BIOS (U9A1)



 
This makes it possible for the BIOS to be upgraded via software rather than replacing the BIOS chip.

 

PB640: CPU Socket (U3B1)



 
This is the CPU socket. This CPU socket can accomodate any of the following CPUs:

Intel Pentium 75 MHz Intel Pentium 133 MHz
Intel Pentium 90 MHz Intel Pentium 150 MHz
Intel Pentium 100 Mhz Intel Pentium 166 MHz
Intel Pentium 120 Mhz
Uses Zero Insertion Force (ZIF) socket
Uses the 320-pin Type 5 CPU Socket
Not keyboard switchable.
Disable cache to slow down system.
Only on systems with a Type 7 Socket


 

PB640: CELP Socket (J1F1)



 
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 on-board then the motherboard will be configured with 256k cache soldered on-board at locations:

U2E1, U2E2, U3E1, U3E2, U2D1, U2D2, U3D1, U3D2.

 

PB640: Cirrus Logic Video Chipset (U3H1)



 
The Cirrus Logic GD-5440 video controller is soldered onto the motherboard.

 

PB640: Video Memory (U3J1 &U3J2)



 
These two chips make up the 1 MB video memory built-in on the motherboard.

 

PB640: Video Memory Upgrade Socket (U2J1 & U4J1)



 
Sockets U2J1 and U4J1 will allow video memory to be upgraded to 2MB from the 1MB that has been integrated with the motherboard.

 

PB640: Video Feature Connector J1J1



 
J13 is a male 2 x 13-pin VESA feature connector allowing video to be routed through a video capture card or a PBTV card.