BIOS (Basic Input/Output System)

The Basic Input/Output System (BIOS) is a ROM chip that is embedded to the computer motherboard.

The BIOS contains instructions for/on:

  • POST (Power-On-Self-Test) – Test computer hardware at power on to ensure no errors exist before loading the operating system.
  • BIOS drivers – Low-level drivers to perform basic control over your computer’s hardware.
  • BIOS/CMOS setup – Configuration program to allow configuration of hardware settings such as date and time.
  • Bootstrap Loader – Locates the operating system for the BIOS to pass control to it.


  1. What is BIOS? (2020, March 6). Computer Hope’s Free Computer Help.

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