Clearing the CMOS RAM
VL-486-4 Reference Manual
DOS Based Quick Start – 15
Clearing the CMOS RAM
Jumper V5[1-2] allows you clear the CMOS RAM contents if you remove the battery, install
incorrect setup information, or otherwise corrupt CMOS RAM. To ensure integrity of the CMOS
RAM, the Setup program calculates and stores an internal checksum of the setup data. Upon
reset, the CPU detects if the CMOS RAM is corrupted by analyzing the checksum. If you wish to
completely clear the contents of the CMOS RAM, briefly move jumper V5 to position [1-2] (top
position) then back to the position [2-3] (lower position) and reboot the system. This process will
load the factory default setup parameters into the CMOS RAM.
Warning!
Do not apply power to the CPU card with jumper V5[1-2] installed, doing so may
damage the chipset and void the warranty. Jumper V5[1-2] is only briefly used to
clear the CMOS RAM.
Figure 3. CMOS RAM Jumper
