BIOS
BIOS (basic input/output system) is the program a personal computer's microprocessor uses to get the computer system started after you turn it on. It also manages data flow between the computer's operating system and attached devices such as the hard disk, video adapter, keyboard, mouse and printer. BIOS is the firmware that starts up when the computer starts up.
You can think of the bios as the conductor.
CMOS
IT starts everything. CMOS (Complementary metal-oxide semiconductor). IT is backed up with a battery. IT stores the BIOS configuration. BIOS settings were stored in CMOS RAM, which was powered by a battery when the computer was powered off. The CMOS saves the BIOS configuration on how to start the computer. It is backed with a battery, so when the computer is off, you can not lose the BIOS configuration.
You can reset the bios by removing the battery that powers the CMOS. The CMOS might be integrated with the southbridge
firm·ware is a permanent software programmed into a read-only memory. You can unplug the computer and plug it back in. It will still work. New computers use Flash memory instead of read only memory. (ROM)
How to upgrade the BIOS
Old BIOS upgrades require boot disk-floppy
Modern upgrades run as an executable
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