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Basic Input/Output

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November 2019

UEFI "Related Documents" Library

UEFI "Related Documents" Library
UEFI "Related Documents" Library

A quick note:  as BIOS engineers, we know that success comes from knowing and navigating through many different industry standards. We are ...

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William Leara
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Welcome to the Basic Input/Output website! Here I share things pertaining to the arcane art of PC BIOS development. For spice, I add material about software development in general and some interesting computer history vignettes. Please, try to contain your excitement!
—William Leara
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popular

  • The Keyboard Controller Interface, 0x60/0x64
    The original IBM PC (1981), and its immediate successor, the IBM PC/XT (1983), had keyboards limited to unidirectional communication:  data ...
  • Introduction to UEFI Conformance Profiles
    The UEFI Specification v2.11 is well over two thousand pages, and even the short list of “required elements” in §2.6 assumes a general-purpo...
  • Introduction to Open Platform Firmware
    Platform firmware development faces a fundamental challenge: every silicon vendor brings its own initialization model, configuration schem...
  • Introduction to Slim Bootloader
    Slim Bootloader (SBL) is an open-source boot firmware built from the ground up for Intel x86 systems. Designed to be small, fast, and secure...
  • RWEverything. Yes, Everything.
    I’ve done many tools reviews in the history of this web site, so it would be unthinkable to neglect to talk about what may be the biggest a...
  • Introduction to SeaBIOS
    SeaBIOS is an open-source implementation of a 16-bit x86 BIOS. The name is a pun: it is a BIOS written in C (instead of the traditional asse...

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