Case study

OUO: a reconstructed Ultima Online demo server

OUO reconstructs the Ultima Online demo server from UoDemo.exe as a C99 program for POSIX systems. Its function-by-function workflow uses disassembly of the original executable, while added server systems and protocol changes support later Ultima Online clients.

Targets: Game
Category: Independent reconstruction cases
Relationship: Independent reconstruction project
Sources reviewed: 2026-11-06

Stars: 175
Last commit: 2026-09-05
Language: C

GitHub data as of 2026-11-10

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Requirements & limits

Prerequisites: A POSIX system with gcc, make and git, plus the separate rundir server data, is needed for the documented installation.
Testing evidence: Ultima Online clients 1.25.30 through 5.0.9.1 are the documented tested range.
License: The repository's C source is licensed under the MIT License; the original UoDemo files are excluded from that license.

Cite

BibTeX

@misc{ouo-case,
  title = {{OUO: a reconstructed Ultima Online demo server}},
  howpublished = {\url{https://github.com/draxinar/ouo}},
  url = {https://github.com/draxinar/ouo},
  urldate = {2026-11-06},
  note = {Awesome REA entry: \url{https://awesomerea.org/resources/ouo-case/}}
}

Plain text

OUO: a reconstructed Ultima Online demo server. https://github.com/draxinar/ouo (accessed 2026-11-06). Awesome REA entry: https://awesomerea.org/resources/ouo-case/

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About this entry

The description was reviewed against primary sources.

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Primary sources

README.md GitHub · draxinar/ouo · Revision 814ea87
USAGE.md GitHub · draxinar/ouo · Revision 814ea87
LICENSE GitHub · draxinar/ouo · Revision 814ea87