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These pages will provide an understanding of what the Basic Input Output System is and how it works in a personal computer.
 
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Introduction To The Basic Input Output System The Power On Self Test (POST Routine) CMOS Settings What's On Board?
How Operating Systems Work BIOS Upgrades Page BIOS Beep Codes
Article Index
Title: Guide To BIOS Systems
Description: Learn about what controls the settings and configuration changes to hardware in your personal computer when its powered down or rebooted. This section also covers topics related to the Power On Self Test ( POST) routine as well as a thorough understanding of the different layers an operating system controls.
No. Of Documents: 6
Last Modification: January 18 2007
 
What Is The BIOS?

The BIOS controls the proper setup and configuration of hard disk drives, floppy drives, memory, and other related devices at the hardware layer. It also has some control over how an operating system interacts during boot up.

If you add a new hard disk drive, it’s the BIOS that will see the drive first. It will then attempt to configure it according to the manufacturer's specifications ( for example, the number of tracks, cylinders, and sector size will all be configured automatically by the BIOS so that the operating system can properly recognize and use the drive).

If you add additional memory to a system, the BIOS handles all updates and counts the quantity of memory installed and return an error code, if a problem exists. The BIOS also sets all configuration items required for the memory to function properly in the system, including speed and voltage requirements.  The BIOS is also in total control of the system boot up process.  When you first turn on the computer, the BIOS performs what is known as a Power On Self Test (POST) routine which consists of a series of tests tests to ensure devices are working properly. You can think of this test as a sort of computer hardware inventory system each time the computer boots up. make sure all devices in the system are functioning properly and checks to see whether other devices, such as a video graphics adapter has its own BIOS that needs to be run during boot up.

The pages contained within this section are devoted to helping you understand the complexities of a Basic Input / Output System.

 
Available Articles:
smallbluedisk.jpg Introduction To The Basic Input Output System
smallbluedisk.jpg The Power On Self Test (POST Routine)
smallbluedisk.jpg CMOS Settings
smallbluedisk.jpg BIOS Int 13 Error Codes
smallbluedisk.jpg What's On Board?
smallbluedisk.jpg How Operating Systems Work
smallbluedisk.jpg BIOS Upgrades Page
smallbluedisk.jpg BIOS Error / POST Beep Codes
smallbluedisk.jpg The BIOS Motherboard ROM
smallbluedisk.jpg Upgrading The BIOS
smallbluedisk.jpg The Pre-Boot Environment
Basic Input Output (BIOS) Frequently Asked Questions
         
Basic Input Output (BIOS) Acronyms
 
 
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