What is the full form of BIOS?

Full form of BIOS: Here, we are going to learn about the BIOS, its full form, history, functions, vendors, advantages and disadvantages. By Anushree Goswami Last updated : March 26, 2024

BIOS: Basic Input Output System

BIOS is an abbreviation of the Basic Input Output System. In the beginning, when you first set on your computer, the first software which starts run by the computer is "BIOS". This software is generally kept in reserve in Read-Only Memory (ROM) and you will discover its position on the motherboard. It is software, which is built-in. The BIOS contents are kept in reserve in flash memory in present-time latest computer systems. BIOS into the memory transfers the drivers of the hard disk and major parts of the operating system like MBR, FAT, GPT, etc., So without BIOS to allow the operating system to persistently loading by its own self is not feasible for an operating system. It is also called the System BIOS, ROM BIOS, and PC BIOS, etc.

BIOS full form


In 1975, BIOS first came into sight in the CP/M operating system. The term BIOS derived from the Basic Input / Output System was introduced by Gary Kildall.

Functions of BIOS

  • The primary role of BIOS is to begin opening and testing all hardware components connected to the computer.
  • It is also used in transferring the major parts of the operating system.
  • BIOS also makes available for use a mean which enables and makes easier the application programs.
  • It is also used to interconnect the operating system with the keyboard, display and other I/O devices.
  • BIOS manage the power management and began opening registers.
  • It examines and transfers the device drivers and intervene handlers to the RAM.
  • It is used to put on show settings of the system.
  • BIOS state and identify the Bootable devices.
  • BIOS began opening the Bootstrap set of orders.
  • A user can change Floppy Drive, Hard Drive, and CD/DVD/BD Drive Settings.

BIOS Vendors

Some of the most popular BIOS vendors in the following are,

  • Phoenix Technologies
  • IBM
  • Dell
  • Gateway
  • American Megatrends (AMI)
  • Insyde Software


  • Overall processing and performance of computers get improved by updating the BIOS.
  • Problems of Compatibility get managed by updation.
  • They give more control to a user over his computer system.


  • BIOS frequently boots not in 32-bit or 64-bit protected mode but 16-bit real mode, and because of the kind of chip utilize, it is not always the quickest.
  • BIOS schedules are usually disorganized, so the latest present time OSs have their own hardware schedules and controlled by drivers.

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