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CMOS or BIOS? What's the difference? The CMOS (pronounced "sea moss") is a computer chip responsible for storing settings of a computer system. The word "CMOS" is actually an acronym which stands for Complementary Metal-Oxide Semiconductor. Try and ... say that 10 times without slipping! Most users have undoubtedly witnessed a message stating "Press DEL to enter Setup", or something similar when a computer has been powered on. If the DEL key was pressed at this instance, something called a CMOS utility screen would appear on the screen. Various hardware settings can ... (view more)