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May 2025

Introduction to PlantUML

Introduction to PlantUML
Introduction to PlantUML

Introduction PlantUML is an open-source tool that allows users to create diagrams using plain text.  Although its name includes the acronym ...

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8:00 AM
William Leara
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tools
8:00 AM

Open Source Firmware Conference and UEFI Plugfest

Open Source Firmware Conference and UEFI Plugfest
Open Source Firmware Conference and UEFI Plugfest

Some exciting news from the firmware conference scene.  In a first, the Open Source Firmware Conference (OSFC) approached the UEFI Forum a...

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8:00 AM
William Leara
0
conferences
8:00 AM
 
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welcome

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

  • Guide to the SWEBOK v4.0 Has Been Released
    The Guide to the Software Engineering Body of Knowledge (SWEBOK) v4.0 was released on October 15, 2024. The Guide is a publication of the ...
  • UEFI Forum Updates All Specs, Dec 2024
    The UEFI Forum updated all three of its specifications in December, 2024:  ACPI, UEFI, and PI. As a refresher: Advanced Configuration and P...
  • EDID and DisplayID
    In " The Before Times" (think: 1980s), there was no way for graphics adapters and monitors to negotiate a common set of supported...
  • 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 ...
  • Reverse Engineering UEFI with Ghidra
    Ghidra is a free and open-source tool for software reverse engineering.  It is extensible, and allows for application-specific capabilities...
  • JEDEC Manufacturer IDs Are a Mess
    The Vendor ID .  Seems like a pretty prosaic topic.  What's to say?  Every vendor has a numeric identifier that is globally unique so th...

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archive

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      • Introduction to PlantUML
      • Open Source Firmware Conference and UEFI Plugfest
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latest UEFI specs

  • UEFI Spec 2.11
  • UEFI PI Spec 1.9
  • ACPI 6.5a

UEFI resources

  • presentations, podcasts, videos
  • white papers

UEFI blog roll

  • BIOS on StackOverflow
    MBR works in QEMU/BOCHS but not on real hardware
  • Vincent Zimmer's blog
    early career aspirations

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