Sem86: a full-system x86 emulator without hardcoded semantics
Sem86 is an x86 full-system emulator without hardcoded semantics. Instead, it loads instruction semantics at runtime from an input file.
Quick read
Sem86 is a full-system x86 emulator that loads instruction semantics at runtime instead of hardcoding them. Visit to emulate different x86 undefined behaviors, boot legacy OSes, and test instruction-semantic differences for analysis.
- Load and switch instruction semantics at runtime
- Boot and run legacy Windows and Linux systems
- Bisect execution to find instructions causing behavior divergence
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- Popularity
- Top 200,000 domain (Cloudflare)
- Google safety check
- No threats found
- Domain registered
- 2023
Checked November 9, 2026 from the site’s own code and public records. See how the rest of the web compares in the NexURLs Internet Report.
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