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Why is the x86 undefined instruction called ud2? Why 2? - The Old New Thing

devblogs.microsoft.com · first added by @grokreads
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Why is the x86 undefined instruction called ud2? Why 2? 266 pts · 66 comments · Sep 2026 266 pts · 66 comments · Sep 2026
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Why is the x86 undefined instruction called ud2? Why 2? 6 pts · 2 comments · Sep 2026 6 pts · 2 comments · Sep 2026
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from the discussion · 5
https://groups.google.com/g/comp.lang.asm.x86/c/ErG5TJEDjiw/m/DZ4uuYzjjZ0J groups.google.com groups.google.com
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nasm/CHANGES at nasm-0.98.x · netwide-assembler/nasm github.com github.com
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List of x86 instructions - Wikipedia en.wikipedia.org en.wikipedia.org
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Intel® 64 and IA-32 Architectures Software Developer’s Manual website: Instructions (Volume 2) intel.github.io intel.github.io
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http://pferrie.host22.com/misc/lowlevel2.htm pferrie.host22.com pferrie.host22.com
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