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Basic Input/Output

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JEDEC Manufacturer IDs Are a Mess

JEDEC Manufacturer IDs Are a Mess
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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7:00 AM
William Leara
0
memory
7:00 AM

Reverse Engineering UEFI with Ghidra

Reverse Engineering UEFI with Ghidra
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...

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7:00 AM
William Leara
2
security, tools
7:00 AM

Introduction to the Netwide Assembler (NASM)

Introduction to the Netwide Assembler (NASM)
Introduction to the Netwide Assembler (NASM)

NASM, or the Netwide Assembler , is an open-source assembler for x86 CPUs.  Why is this important?  NASM is a prerequisite for building with...

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4:35 PM
William Leara
0
tools
4:35 PM

Software Bill of Materials (SBOM) in Practice

Software Bill of Materials (SBOM) in Practice
Software Bill of Materials (SBOM) in Practice

On May 12, 2021, U.S. President Joe Biden issued the  Executive Order on Improving the Nation’s Cybersecurity .  ( Executive Order 14028 )  ...

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3:02 PM
William Leara
1
security
3:02 PM
 
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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

  • 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...
  • 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 ...
  • 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...
  • Introduction to Open Platform Firmware
    Platform firmware development faces a fundamental challenge: every silicon vendor brings its own initialization model, configuration schem...
  • 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...
  • 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 ...

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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

  • Vincent Zimmer's blog
    20 years of beyond bios
  • BIOS on StackOverflow
    Why load the value “01301h” into AX before invoking interrupt 10h?

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