About
The Basic Input/Output System (BIOS) is a non-volatile firmware used:
- to perform hardware initialization during the booting process (power-on startup),
- and to provide runtime services for operating systems and programs.
The BIOS is the first software to run when the computer is powered on.
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Management
Location
- 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.