BIOS is an acronym for Basic Input and Output System. This program is stored in a Read-Only Memory chip on the motherboard. The BIOS Setup is a program essential to optimizing and configuring the hardware and behavior of the computer.
Setup programs vary from one computer to another.
Check your motherboard manual for BIOS Setup options and settings. CMOS stands for Complementary Metal Oxide Semiconductor in which your PC hardware configuration is stored. The CMOS maintains a PC s internal clock, controls how fast your computer reads from memory, whether or not your CPU's cache is enabled or disabled, how fast your PCI bus communicates with its adaptor cards, and much more. These CMOS settings can be adjusted in the BIOS Setup. At times, the CMOS needs to be cleared - especially if you need to flash upgrade a BIOS or when you lose your password to the BIOS Setup program.