BIOS- The Input Output system

BIOS- The Input Output system

BIOS 

BIOS is a basic input Output system BIOS is a ROM chip found on motherboards that allows you

access and set up your system at the most basic level. and major BIOS manufactures American

1. Megatrends inc. (AMI)
2. Phoenix Technologies
3. ALi
4. Winbond

Main Functions of BIOS

• Power on Self Test (POST)
• Bootstrap Loader
• Setup utility program
• BIOS Drivers 

(POST) Power on Self-test:-   A built-in diagnostic program that whether All of the different hardware components in the system to make sure everything is working properly. such as memory and keyboard.

Bootstrap Loader:-  It 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.

Setup Utility Program:- A non-volatile memory (NVRAM) is used to store information about the computer system. 

The computer BIOS setup utility (also known as the CMOS setup) is the place where you can change a few basic computer hardware settings The Bios contains all the setting and the CMOS memory is a piece of RAM that remembers all the info .

The settings of memory, disk types and other settings are stored in NVRAM.

BIOS Drivers:- BIOS drivers are collection of programs stored in one or EEPROM or EPROM memory chips, depending on the computer design, on the motherboard. The basic drivers needed to start the computer system.

Firmware

Firmware is a upgrade version of BIOS. It performs operations such as initializing the device, checking whether all the peripheral devices such as printer, scanner etc. and other components are working fine.

BIOS (Basic input output system) of a computer is a firmware that ensures all the hardware devices attached to the computer are working perfectly.

Firmware interface is (UEFI) Unified Extensible Firmware Interface is an advance interface standard of firmware for operating system and is meant to replace to standard BIOS.