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How to tackle the Jumpers:
1
2
If a pin-header (of 2 or more pins) is
designed in such a way that its pins
can be closed or linked together to
set up a specific function, this header
is called a jumper in this manual.
• A Jumper is usually but not necessarily given a "JpX" legend.
• In the Jumper setting diagram, the jumper pins covered with
black marks stand for closed pins with jumper cap.
1
Jp X
Jumper with
Pin 2-3 closed
• Do not remove any jumper cap when power is on. Always
make sure the power is off before changing any jumper settings.
Otherwise, the mainboard will be damaged.
2-8.1 Jp4: CPU Clock Select
Jp4 is designed to select 100/133MHz CPU
clock for the system. Setting Jp4 to 1-2 closed
will allow CPU on board to autodetect its own
frequency and apply it to the System Bus.
Setting JP4 to 2-3 closed will manually config-
ure a 100MHz CPU to 133MHz.
However, overclocking should always take the
whole mainboard into account. There is no 100%
guaranty of success. In case overclocking fails,
system boot will fail. You should then take the
autodetect setting to boot system. Even more,
you should clear CMOS before rebooting
system. ( See JBAT 1 Clear CMOS ).
3
A 3-pin Jumper
3
1
Jumper with
all pins open
27
Chapter 2 Hardware Setup
A 2-pin
Jumper
Cap
The conductor inside the cap
links two header-pins together.
3
1
Jumper with
Pin 1-2 closed
JP4
CPU Clock Select
1
(default)
1-2 closed
CPU Autodetect
1
2-3 closed
for 133MHz CPU
Clock
3
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