Basic Input/Output System (BIOS) – What? How does it work? – PlayAndrotics

BIOS (basic input/output system) is the program to get the computer system started after you turn it on. It identifies your computer hardware, configures that, tests that and connected to your operating system. This is called the boot process. It also manages data (instruction) flow between the computer’s operating system and attached devices such as the hard disk, joystick, keyboard, mouse and printer, microphones, webcams.

BIOS limitations led to the creation of a new firmware interface call UEFI (unified extensible firmware interface). UEFI has some advantages such as,

  • You can boot over 2 TB disk
  • It has graphical user interface
  • Network capability
  • Backward/Forward compatible.

If we compare with BIOS but they work very similar. BIOS chip looked like down below.


And it’s located on your Motherboard. For entering the BIOS Setup Utility use ‘’Delete/Esc/F1/F2” button form keyboard when the computer in startup.


Now let’s talk about BIOS Setup Utility. We can get lot of things such as,

  • System Information
  • CPU Information
  • PC Health Status
  • Power Management
  • Boot Process Order Change
  • Audio Control
  • PC Slot Configuration
  • Processor Graphics Clock Speed
  • CPU Clock Ratio

Modern day motherboards have EEPROM BIOS chips that can be reprogrammed by software update. If your BIOS isn’t flash able it’s still possible to update it – provided it’s housed in a socketed DIP or PLCC chip. This involves physically removing the existing chip and either replacing it after its been reprogrammed with the later version of BIOS code or exchanging it for a completely new chip. For more,

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