Complementary metal–oxide–semiconductor (CMOS) is a technology for constructing integrated circuits. CMOS technology is used in microprocessors, microcontrollers, static RAM, and other digital logic circuits. CMOS technology is also used for several analog circuits such as image sensors (CMOS sensor), data converters, and highly integrated transceivers for many types of communication.
Two important characteristics of CMOS devices are high noise immunity and low static power consumption. Since one transistor of the pair is always off, the series combination draws significant power only momentarily during switching between on and off states. Consequently, CMOS devices do not produce as much waste heat as other forms of logic, for example transistor–transistor logic (TTL) or N-type metal-oxide-semiconductor logic (NMOS) logic, which normally have some standing current even when not changing state. CMOS also allows a high density of logic functions on a chip. It was primarily for this reason that CMOS became the most used technology to be implemented in very-large-scale integration (VLSI) chips.
CMOS and BIOS
CMOS Setup stores changable aspects of BIOS which can be adjusted using the System (or CMOS) Setup Utility.
Not all of BIOS is absolutely fixed because it has changeable aspects. To change these, we must get to CMOS (System Setup). Press the designated button during BIOS to enter System Setup.
If you forget Supervisor Password for BIOS, you can clear it using a Motherboard jumper.