Reverse-engineering the 1998 Ultima Online demo server

Draxinar Reverse-engineering the 1998 Ultima Online demo server May 1, 2026 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. UoDemo.exe For those who don’t know, Ultima Online is a 1997 MMORPG developed by Origin Systems Inc. It was one of the