BIOS and UEFI

BIOS

The BIOS (/ˈbaɪ.ɒs/, an acronym for Basic Input/Output System and also known as the System BIOS, ROM BIOS or PC BIOS) is a type of firmware used to perform hardware initialization during the booting process (power-on startup) on IBM PC compatible computers, and to provide runtime services for operating systems and programs.^[1] The BIOS firmware is built into personal computers (PCs), and it is the first software they run when powered on. The name itself originates from the Basic Input/Output System used in the CP/M operating system in 1975.^[2]^[3] Originally proprietary to the IBM PC, the BIOS has been reverse engineered by companies looking to create compatible systems and the interface of that original system serves as a de facto standard.

UEFI

The Unified Extensible Firmware Interface (UEFI, pronounced as an initialism U-E-F-I or like "unify" without the n^[4]) is a specification that defines a software interface between an operating system and platform firmware. UEFI replaces the Basic Input/Output System (BIOS) firmware interface originally present in all IBM PC-compatible personal computers^[5], with most UEFI firmware implementations providing legacy support for BIOS services. UEFI can support remote diagnostics and repair of computers, even with no operating system installed.^[6]

quiz

Resources

A+ Certification: Wikibook on A+ Certification

References

↑ "Ref — System BIOS". PCGuide. Retrieved 6 December 2014.
↑ Kildall, Gary A. (June 1975), CP/M 1.1 or 1.2 BIOS and BDOS for Lawrence Livermore Laboratories
↑ Kildall, Gary A. (January 1980). "The History of CP/M, THE EVOLUTION OF AN INDUSTRY: ONE PERSON'S VIEWPOINT" (Vol. 5, No. 1, Number 41 ed.). Dr. Dobb's Journal of Computer Calisthenics & Orthodontia. pp. 6–7. Retrieved 2013-06-03.
↑ "UEFI BIOS Explained". pcpro.co.uk. 2013-05-03. Retrieved 2014-07-05.
↑ Michael Kinney (1 September 2000). "Solving BIOS Boot Issues with EFI" (PDF). pp. 47–50. Retrieved 14 September 2010.
↑ "The 30-year-long Reign of BIOS is Over: Why UEFI W... - Input Output". hp.com. Archived from the original on 2013-06-26. Retrieved 2012-03-06.

[pcguidedefinition-1] "Ref — System BIOS". PCGuide. Retrieved 6 December 2014.

[Kildall_1975_BDOS-2] Kildall, Gary A. (June 1975), CP/M 1.1 or 1.2 BIOS and BDOS for Lawrence Livermore Laboratories

[Kildall_1980_CPM-3] Kildall, Gary A. (January 1980). "The History of CP/M, THE EVOLUTION OF AN INDUSTRY: ONE PERSON'S VIEWPOINT" (Vol. 5, No. 1, Number 41 ed.). Dr. Dobb's Journal of Computer Calisthenics & Orthodontia. pp. 6–7. Retrieved 2013-06-03.

[pronunciation-4] "UEFI BIOS Explained". pcpro.co.uk. 2013-05-03. Retrieved 2014-07-05.

[Intel2000-5] Michael Kinney (1 September 2000). "Solving BIOS Boot Issues with EFI" (PDF). pp. 47–50. Retrieved 14 September 2010.

[HPBIOSreign-6] "The 30-year-long Reign of BIOS is Over: Why UEFI W... - Input Output". hp.com. Archived from the original on 2013-06-26. Retrieved 2012-03-06.

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