CMOS and BIOS

The difference between BIOS and CMOS:

1. The   so-called bios, in fact, is the basic computer input and output system (basic input-output systems), its content is integrated in a microcomputer motherboard on a ROM chip, the main preservation of the computer system is the most important basic input and output programs, System Information settings, Power-On self-test program and system startup bootstrap program.                                                                                                                   
2.   CMOS (intended to refer to the complementary metal oxide semiconductor storage, is a large-scale application of integrated circuit chip manufacturing raw materials) is a microcomputer motherboard on a read-write RAM chip, mainly used to save the current system hardware configuration and operators of certain parameters set. CMOS RAM chips are powered by the system through a backup battery, so no CMOS information is lost either in the shutdown State or when the system is out of power.

Since CMOS RAM chip itself is only a piece of memory, only has the function of saving data, so the parameters in the CMOS set to pass a special program. The early CMOS Setup program resides on a floppy disk (such as IBM's PC/AT model), which is inconvenient to use. Most manufacturers now do the CMOS Setup program in the BIOS chip, the system can be easily set up by pressing a specific key at boot time, so this CMOS setting is often called the BIOS setup.

CMOS and BIOS