The BIOS originally proprietary to the IBM PC has been reverse engineered by some companies (such as Phoenix Technologies) looking to create compatible systems.
The name originates from the Basic Input/Output System used in the CP/M operating system in 1975. The BIOS firmware comes pre-installed on an IBM PC or IBM PC compatible's system board and exists in UEFI-based systems too. In computing, BIOS ( / ˈ b aɪ ɒ s, - oʊ s/, BY-oss, -ohss Basic Input/Output System, also known as the System BIOS, ROM BIOS, BIOS ROM or PC BIOS) is firmware used to provide runtime services for operating systems and programs and to perform hardware initialization during the booting process (power-on startup). A pair of AMD BIOS chips for a Dell 310 computer from the 1980s
