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Chapter 2: Hardware information
2.7 Jumpers
The jumpers on the motherboard allow you to change some feature
settings to suit your customized system configuration.
1. JumperFree™ mode (JEN)
This jumper allows you to enable or disable the JumperFree™ mode.
The JumperFree mode allows you to change CPU settings through the
BIOS setup instead of using the DIP switches.
Before changing any jumper setting on the motherboard, make sure to
read the jumper setting descriptions in this section.
2. CPU external frequency selection (FSJ1)
These jumpers allow you to adjust the CPU external frequency. The
illustration below shows the jumpers in default positions.
P4SDR-VM
®
P4SDR-VM JumperFree™ Mode Setting
Jumper Free
Jumper Mode
1
2
1
2
(Default)
JF1
P4SDR-VM
®
P4SDR-VM CPU
External Frequency Selection Default
FSJ1
(Default)
FS0
FS1
FS2
FS3
FS4