Installation
2-17
Jumpers
The mainboard provides jumpers for setting the mainboard’s functions. This
section will explain how to change settings for your mainboard’s functions
through the use of the jumpers.
Clear CMOS: CLEAR_CMOS
The onboard CMOS RAM stores system configuration data and has an
onboard battery power supply. The long-life battery has a lifetime of at least
5 years. If you want to clear the system configuration data from the CMOS
RAM, use the CLEAR_CMOS (Clear CMOS jumper). You can clear the
CMOS by shorting pins 1 and 2 while the system is off. Then return it to the
2-3 pin position. Shorting the jumper while the system is on will damage the
mainboard. The default position of the jumper is on pins 2 and 3.
Voltage Selector: J1
The 20th pin on both IDE connectors can provide either 3.3V or 5V to the
IDE device.
Setting
1
2
3
Keep
OFF
ON
ON
Clear
ON
ON
OFF
Pin
Signal
1
DOM_POWER
2
+5V
3
DOM_POWER
4
+3.3V
CLEAR_CMOS
1
2
3
1
3
J1
2
4
