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Motherboard Jumper Settings (Pentium 1)

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This document provides technical information about using the jumper blocks on the motherboard.
NOTE: This document contains procedures that are technical. The person performing the procedure should have extensive computer experience working both with hardware and software.

Jumper and switch functions for HP Pavilion 3100 series PCs

Figure 1: Motherboard layout for the 3100 series
3100 Series Motherboard Layout Legend
A Socket 7 Pentium Processor B 82438VXsocket C 82437VX D DIMM sockets
E PCI/ISA Expansion Connector F 82371SB PCI ISA/IDE Accelerator (PIX3) G S3 TRIO 64V+ Graphics H Video memory controller
I VGA Feature Connector J Primary IDE connector K Secondary IDE connector L Floppy Drive connector
M Battery N VGA Monitor connector O Universal Serial Bus connectors P Microphone connector
Q Speaker connector R Super I/O, RTC and Keyboard controller S Mouse connector T Keyboard connector
U Parallel port connector V Serial port connector (COM1) W Power Supply connectors

JCF1/JCF2: Host clock selector

Host ClockJCF1JCF2
50 2 - 3 2 - 3
55 1 - 2 2 - 3
60 2 - 3 1 - 2
66 (default)1 - 21 - 2

JBF0/JBF1: CPU speed multiplier selector

CPU MultiplierJBF0JBF1
x 1.5 1 - 2 1 - 2
x 2.0 2 - 3 1 - 2
x 2.5 (default) 2 - 3 2 - 3
x 3.0 1 - 2 2 - 3

JA2V: P55C CPU voltage selector

P55C VoltageJA2V
2.84V (default) 2 - 3

JA3V: CPU voltage selector

CPU VoltageJA3V
3.38V (default) 1 - 2
3.54V 2 - 3

JPWRS: P54C or P55C CPU type selector

CPU TypeJPWRS 1 , 2
P54C 1 - 3 , 2 - 4
P55C (default) 3 - 5 , 4 - 6

JBAT: RTC battery enable/disable

RTC BatteryJBAT
Enable (default) 1 - 2
Disable 2 - 3

JUSBCLK: USB clock selector

USB ClockJUSBCLK
24 MHz 1 - 2
48 MHz (default) 2 - 3

JWRT: Sound chip EPROM, 24C16, programming control

24C16JWRT
On (default) Programming 24C16 in manufacturing process
Off Write protect after manufacturing process

Jumper and switch functions for HP Pavilion 3200 series PCs

Figure 2: Motherboard layout for the 3200 series
A Socket 7 Pentium Processor B 430 TXR Chipset socket C DIMM sockets D PCI/ISA Expansion Connector
E Primary IDE connector F Secondary IDE connector G Floppy Drive connector H Front Panel connectors
I Battery J ATI VT2 2W 3D Graphics Controller K VGA Feature Connector L Upgrade Video Memory
M 1 Mbyte Video memory N BIOS Flash ROM O 16 bit industry standard audio P VGA Monitor connector
Q Universal Serial Bus connectors R CD-ROM Audio connector S Speaker connector T Microphone connector
U Mouse connector V Keyboard connector W Game port connector X Parallel port connector
Y System fan connector Z Serial port connector (COM1) AA Processor fan connector BB Power Supply connectors

JBF0/JBF1/JBF2: CPU speed selector

CPU MultiplierJBF0JBF1JBF0
Pentium (R) 200 MHz with MMX 1 - 2 2 - 3 1 - 2
Pentium 233 MHz with MMX 1 - 2 1 - 2 1 - 2