What is 'CMOS?

Answer 1

It's the battery on a Motherboard/Similar COmputer Component that allows it to retain BIOS information

Answer 2

Complementary Metal Oxide Semiconductor.

In computing the term CMOS is often used to mean the non-volatile memory that stores motherboard BIOS information. This was called the CMOS RAM or just the CMOS because it usually used a low-power CMOS memory chip, powered by a small battery. The term remains common as nearly all modern computer components except the "CMOS memory" are constructed in CMOS technology. For the "CMOS", in modern computers, flash memory is usually used.

CMOS, short for Complementary Metal Oxide Semiconductor Is an MOS technology in which both P-channel and N-channel devices are fabricated on the same die CMOS is a widely used type of semiconductor. CMOS semiconductors use both NMOS (negative polarity) and PMOS (positive polarity) circuits. Since only one of the circuit types is on at any given time, CMOS chips require less power than chips using just one type of transistor. This makes them particularly attractive for use in battery-powered devices, such portable computers. Personal computers also contain a small amount of battery-powered CMOS memory to hold the date, time, and system setup parameters.

CMOS topology is very attractive also because circuitry logic synthesis is made automatically. So, you derive logical equation of digital circuit and don't bother about optimization and topology (not too much, maybe you have to edit place&route results).

It is also a good idea to adopt CMOS topology because there will never be an high impedance node (each node will be connected to Vdd or GND), so you gain robustness and noise margin (distance between voltage of logical signals, here Vdd-0=Vdd) is always maximum.

COMS ARE attractive in some application because of the hi rejection signal to noise levels that is because they can operate at higher voltages then TTL however there are drawbacks the hi impedance of these devices if not accounted for can and will cause malfunctions.

Answer 3

CMOS stands for Complementary Metal-Oxide semiconductor. It is the computer chip that your BIOS is stored on. BIOS is information about your computer configuration. For instance, BIOS tells your computer to boot to your floppy drive first, before your hard drive. And you may change that sequence if you like by changing the BIOS. When you start your computer it goes thru BIOS at startup to make sure all of your components are working. If you would like to see your BIOS, you would hit one of the F keys when your system starts up. Unfortunately there is no standard, as different motherboard makers use different F keys. But the most common is F2 so give it a try.

Answer 4

In business ad finance, a CMO is a collateralized mortgage obligation, a type of complex debt security that repackages and directs the payments of principal and interest from a collateral pool to different types and maturities of debt securities.

CMOs were first created in 1983 by the investment banks Salomon Brothers and First Boston for U.S. mortgage lender Freddie Mac.

While there is nothing inherently wrong with pooling assets in a vehicle like a CMO, the use (or abuse) of CMOs backed by loans of lower credit quality, such as subprime mortgage loans, led to defaults, which in turn led to the failure of several investment banks and banks and subsequent recession in the United States in 2008.