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November 2024

Grandpa, Tell Me The Story Again About The A20 Gate

Grandpa, Tell Me The Story Again About The A20 Gate
Grandpa, Tell Me The Story Again About The A20 Gate

After my previous article on the keyboard controller interface , there was a global public outcry (well, OK, there was Rothman ) absolutely ...

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9:00 AM
William Leara
0
CPU, Intel, memory
9:00 AM

The Keyboard Controller Interface, 0x60/0x64

The Keyboard Controller Interface, 0x60/0x64
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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8:39 AM
William Leara
0
EC
8:39 AM
 
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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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  • 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...
  • 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...
  • 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...
  • 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...
  • 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 ...
  • The Binwalk Firmware Analysis Tool
    I’ve recently been experimenting with a wicked-fun tool you may find useful called Binwalk :  a “fast, easy to use tool for analyzing and ex...

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latest UEFI specs

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

UEFI resources

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  • white papers

UEFI blog roll

  • BIOS on StackOverflow
    intel cpu register I/O error(U_MSR_PMON_GLOBAL_CTL) [closed]
  • Vincent Zimmer's blog
    April showers....

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