An abbreviation for complementary metal-oxide semiconductor - a term that describes how a CMOS microchip is manufactured. Powered by a small battery, the CMOS chip retains crucial information about what hardware a PC comprises even when the power is turned off.

互补式金氧半导体。PC 中有一颗 CMOS 晶片，里面存有 PC 的资料，如内部硬体的设定。PC 之 CMOS 需要一颗电池来提供电力。