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Chapter 2: Hardware information
12. Clear RTC RAM (CLRTC)
These solder points allow you to clear the Real Time Clock (RTC)
RAM in CMOS. You can clear the CMOS memory of date, time, and
system setup parameters by erasing the CMOS RTC RAM data. The
RAM data in CMOS, that include system setup information such as
system passwords, is powered by the onboard button cell battery.
To erase the RTC RAM:
1. Turn OFF the computer and unplug the power cord.
2. Remove the battery.
3. Short the solder points.
4. Re-install the battery.
5. Plug the power cord and turn ON the computer.
6. Hold down the <Del> key during the boot process and enter BIOS
setup to re-enter data.
11. USB 2.0 setting (3pin USB20_EN)
(on audio models only)
This jumper allows you to enable or disable the Universal Serial Bus
(USB) 2.0 capability. Set to Enable (pins 1-2) if you wish to use USB
2.0 compliant devices.
P4B266
®
P4B266 USB Setting
USB20_EN
EnableDisable
(Default)
1
2
2
3
P4B266
®
P4B266 Clear RTC RAM
CLRTC(R197)
Short solder points
to Clear CMOS
CR2032 3V
Lithium Cell
CMOS Power