What is BIOS? Explain the functions of BIOS

BIOS stands for Basic Input/output System, the BIOS (pronounced bye-oss) is a ROM chip located on all motherboards that allows you to access and set up your computer system at the most basic level.


It is also known as CMOS stands for complementary metal-oxide semiconductor. It stores configuration information of computer.

The BIOS includes instructions on how to load basic computer hardware and includes a test referred to as a POST (Power On Self-Test) that helps verify the computer meets requirements to boot up properly. If the computer does not pass the POST, you will receive a combination of beeps indicating what is malfunctioning within the computer.

The four main functions of a PC BIOS


 POST - Test the computer hardware and make sure no errors exist before loading the operating system. Additional information on the POST can be found on our POST and Beep Codes page.


Bootstrap Loader - Locate the operating system. If a capable operating system is located, the BIOS will pass control to it.


BIOS drivers - Low level drivers that give the computer basic operational control over your computer///s hardware.


BIOS or CMOS Setup - Configuration program that allows you to configure hardware settings including system settings such as computer passwords, time, and date.

Knowledge 2016-09-24View: 12688

Categories: Knowledge


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