BIOS

Introduction:

BIOS support you to change a lot of features of operating system, so you have to focus when you are read this information. 

(Bios) Acronym for basic input/output system, the built-in software that determines what a computer can do without accessing programs from a disk. On PCs, the BIOS contains all the code required to control the keyboard, display screen, disk drives, serial communications, and a number of miscellaneous functions.

 This video help you to know  what BIOS means and what version of the BIOS are you running?

The BIOS is typically placed in a ROM chip that comes with the computer (it is often called a ROM BIOS). This ensures that the BIOS will always be available and will not be damaged by disk failures. It also makes it possible for a computer to boot itself. Because RAM is faster than ROM, though, many computer manufacturers design systems so that the BIOS is copied from ROM to RAM each time the computer is booted. This is known as shadowing. Many modern PCs have flash BIOS, which means that the BIOS has been recorded on a flash memory chip, which can be updated if necessary. The PC BIOS is fairly standardized, so all PCs are similar at this level (although there are different BIOS versions). Additional DOS functions are usually added through software modules. This means you can upgrade to a newer version of DOS without changing the BIOS.

 Plug and play BIOS :

• Prior to Windows 95 the BIOS was responsible for managing all hardware devices such as the floppy and hard disk drives, serial and parallel ports, video and network cards, the keyboard, and system clock.

• When hardware was added to the system, the user adding the hardware had to set a variety of parameters such as the starting address in memory where the buffers and startup code could be found as well as the interrupt priority level (IRQ) of the device. Windows 95 introduced Plug-and-Play (PnP) BIOS which automates the process of detecting and adding hardware to a system.
  

  
  

  
  

• In addition to making it far easier for the user to add hardware devices -- PnP eliminated hardware conflicts that could cripple the PC.

  
  

  
  

  See links:

  
  

  
  

  - http://www.gigabyte.com/MicroSite/121/tech_a_bios.htm

  - http://www.phoenix.com

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