What is BIOS
Basic Input Output System
It acts as an intermediary between computer hardware and its operating system without BIOS, the PC's operating system cannot be communicate with, Or take control, of the hardware.
How BIOS works
---- Power On Self Test (POST)
---- Bootstrap Loader
----- Setup utility program
---- BIOS drivers
Function of BIOS
(I) power on self test(POST)
BIOS conducts power-on-self-test(POST) built-in Diagnostic program that checks whether the computer has all of the necessary parts and functioning properly, such as memory and keyboard.(II) Bootstrap Loader
Helps in loading the operating system.The program searches for any available operating system and if found, it loads the operating system into RAM of the computer.
(III) Setup Utility Program
A non-volatile memory (NVRAM) is used to store information about the computer system.
During installation of a system the user runs BIOS setup program and enters the correct parameters.
The settings of memory, disk types and other setting are stored in NVRAM.
(IV) BIOS Drivers
BIOS drivers are collection of programs stored in one or more EEPROM and EPROM (memory) chips,depending on the computer design on the motherboard.
Benefits of BIOS for Desktop / Laptop
---- Enforcing Security
---- Hardware Monitoring
---- Operating system Booting
---- Hardware Testing
---- Hardware Troubleshooting
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