its really easy to do that but the working
mechanism is important to understand !
mechanism is important to understand !
CONCEPT BEHIND:- We know 1.RAM(i.e the main memory) is volatile. whereas 2.ROM(i.e Read Only Memory) is a non-volatile memory and we cant write anything to it.the bios program is embedded in the ROM-chip by the motherboard manufacturing vendor.but if ROM is truly a read Only Memory then how can it store the customized bios settings (like boot device priority, bios date-&-time,bios password,etc.) ?And if ROM is not the place then where these settings are saved (because that memory-space has to be writable as these settings are changeable) ?
these settings are actually stored in a volatile memory chip present within the motherboard-called CMOS [Complementary metal oxide semiconductor] .since this CMOS is writable, its volatile too. As such once the power goes off ,it will also loose all its data. that's why its kept alive with the help of the mother-board battery power.
Therefore on taking out the mother-board battery the custom-bios-configurations are lost from the CMOS and the motherboard is reset
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