Basic Input/Output System (BIOS)


The Basic Input/Output System (BIOS) is a non-volatile firmware used:

The BIOS is the first software to run when the computer is powered on.



  • Originally, BIOS firmware was stored in a ROM chip on the PC motherboard.
  • In modern computer systems, the BIOS contents are stored on flash memory so it can be rewritten without removing the chip from the motherboard.

Documentation / Reference

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