D Draxinar personal blog

Reverse-engineering the 1998 Ultima Online demo server

draxinar.github.io 5 min read

After 10 years of on-and-off work, I’m releasing a full reverse-engineering of the 1998 Ultima Online demo server: https://github.com/draxinar/ouo . About 5,000 functions disassembled from MSVC x86 and translated into portable C99, with each function compared instruction-by-instruction against the binary.

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Software EngineeringHistory & Retro Computing2026

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