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What is BIOS ..

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1 What is BIOS .. on Fri Jul 27, 2012 10:32 am

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BIOS (Basic Input Output System) has been widely introduced by IBM in almost 25 years ago when our first PC. At that time was one of the few solutions in which a level of abstraction independent of operating system and which have at the same time the quality of being sufficiently documented. This system served a wide range of basic functions, perform the steps required loading the operating system and also provides some configuration options.

In fact, it's a chip located on the motherboard, which makes sure that all parts of the computer at startup, to work together. Before being loaded operating system is initialized BIOS which through basic routines (input / output), provides communication between hardware components installed on your computer.


Initially, this was a ROM chip, but because in these conditions was difficult to update, medium was replaced by EEPROM memory, called flash ROM. The chip is mounted on a pedestal, to be easily replaceable (like any other component) and even his double secured to prevent errors caused by faulty BIOS (Dual BIOS).

Currently there are three main BIOS chip maker best known, namely Phoenix Technologies, AWARD Software and AMI (American Me, Inc. gatrends.). generally, motherboard manufacturers opt for one of these three.

What is BIOS?
The BIOS has many roles, but most important is about to call all components connected to the motherboard. When the computer is on, information from the hard disk (HDD) may not reach the processor (CPU) and thus the operating system can be charged without instructions provided by the BIOS.

Also, the BIOS has conducted a series of processes, including a test to check if everything works properly, reading information from other chips BIOS initializes other blocks (eg graphics card), several commands operating system will use to work with different hardware, hard disk settings, clock etc..

In conclusion, the BIOS performs three basic functions:

Checking components on startup (Power On Self-Test or POST).
Loading the operating system on your hard disk (HDD) in working memory.
Connects the operating system and some hardware devices.

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