The BIOS stands for Basic Input Output System. The BIOS is a set of instruction built into our computer to control how information and data flow in and out of our system.
Some of the other common tasks that the BIOS Performs include:
a) A power on self test for the entire different hardware component in the system to make sure everything is working properly.
b) Activating other BIOS chip on different cards installed in the computer.
c) Managing a collection of setting for the hard disk, clock etc.
Concepts of BIOS
The BIOS supports all peripheral technology including hard disk drive as well as internal services. There are two concepts of BIOS:
1) BIOS Power on self test (POST)
The power on self test is a built in diagnostic program that checks PC hardware to ensure that everything is present and functioning properly. The most important job of BIOS is to give the micro processor its first instruction and to load operating system on. It then performed a post.
2) BIOS setup utility
BIOS setup utility enables the user to modify the PC settings and store than in the CMOS. This utility also enables to control the booting sequence. It can be used to change the BIOS to connect any hardware problem such as floppy disk drive error etc.