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(3) CMOS RAM Clear (3-pin): JBAT
A battery must be used to retain the motherboard configuration in CMOS RAM short 1-2
pins of JPAT to store the CMOS data.
To clear the CMOS, follow the procedure below:
1. Turn off the system and unplug the AC power
2. Remove ATX power cable from ATX power connector
3. Locate JBAT and short pins 2-3 for a few seconds
4. Return JBAT to its normal setting by shorting pins 1-2
5. Connect ATX power cable back to ATX power connector
Note: When should clear CMOS
1. Troubleshooting
2. Forget password
3. After over clocking system boot fail
2-3 Glossary
Chipset (core logic) - two or more integrated circuits which control the interfaces between the
system processor, RAM, I/O devises, and adapter cards.
Processor socket - the socket used to mount the system processor on the motherboard.
Slot (AGP, PCI, ISA, RAM) - the slots used to mount adapter cards and system RAM.
AGP -
Accelerated Graphics Port - a high speed interface for video cards; runs at 1X (66MHz), 2X
(133MHz), or 4X (266MHz).
PCI - Peripheral Component Interconnect - a high speed interface for video cards, sound cards,
network interface cards, and modems; runs at 33MHz.
Serial Port -
a low speed interface typically used for mouse and external modems.
Parallel Port -
a low speed interface typically used for printers.
PS/2 - a low speed interface used for mouse and keyboards.
USB - Universal Serial Bus - a medium speed interface typically used for mouse, keyboards,
scanners, and some digital cameras.
Sound (interface) - the interface between the sound card or integrated sound connectors and
speakers, MIC, game controllers, and MIDI sound devices.
BIOS (Basic Input/Output System) - the program logic used to boot up a computer and
establish the relationship between the various components.
Driver - software, which defines the characteristics of a device for use by another device or other
software.
Processor - the "Central Processing Unit" (CPU); the principal integrated circuit used for
doing the "computing" in "personal computer"
Front Side Bus Frequency -
The working frequency of the motherboard, which is generated
by the clock generator for CPU, DRAM and PCI BUS.
CMOS RAM Clear Setting
2-3 closed Clear CMOS
JBAT
JBAT
1-2 closed Normal (Default)
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