Beginners often confuse the BIOS and CMOS, such as the BIOS settings and CMOS settings, make people misty water, in fact, they are two different chips, which are briefly introduced.
1.ROM BIOS is a BIOS (Basic Input Output System) that is cured in the ROM (basic input and output system), controlling system hardware, and provides low-level calls for high-level software. The BIOS chip is a rectangular chip on the motherboard, which is more common: AMI BIOS and Award BIOS. The BIOS is mainly stored: (1) Self-diagnostics: By reading the contents of the content in the CMOS RAM, self-testing and initialization; (2) CMOS setup program: During the boot process, start with a special hotkey, After setting, deposit in CMOS RAM; (3) System Self-lifting loader: load the boot program on 0 channels on 0 channels into memory after self-test, so that it operates to load the DOS system; 4) Drivers and interrupt services for primary I / O equipment.
2. CMOS RAM is a complementary metal oxide semiconductor random memory. Storage system setting parameters. The CMOS is originally a manufacturing specification of an integrated circuit, which originates from the integrated circuit numbered MC 146818, which is a part of CMOS, referred to as CMOS. Due to the power-off data, it is now not lost if there is a battery on the motherboard to keep the data after power off.
3. Both relationships: The ROM BIOS is stored in the machine language program, and the data is stored in the CMOS RAM. The BIOS calls CMOS data during the boot operation and sets CMOS data.
