Case study

Ultima IV: near-matching reconstruction of its DOS executables

Ultima IV decompiled reconstructs the PC game's AVATAR.EXE and TITLE.EXE as C and assembly source. The author reports that compiling and linking the recovered files with Microsoft C Compiler 4.00 produces executables about ten bytes different from each original.

Targets: Binary · Game
Category: Independent reconstruction cases
Relationship: Independent reconstruction project
Sources reviewed: 2026-11-06
Evidence class: C2 code & docs, no demo or download

Stars: 83
Last commit: 2023-10-05
Language: C

GitHub data as of 2026-11-10

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Evidence

Observed: Code and documentation observed; no download method or demo found.
Checked: 2026-11-09

How evidence classes are assigned

Requirements & limits

Prerequisites: Rebuilding uses Microsoft C Compiler 4.00.
Testing evidence: The author reports roughly ten bytes of difference per rebuilt executable.
Limits: Only CGA.DRV was reversed among the separate graphics drivers.
License: No licence file in the repository.

Cite

BibTeX

@misc{ultima-iv-decompiled-case,
  title = {{Ultima IV: near-matching reconstruction of its DOS executables}},
  howpublished = {\url{https://github.com/ergonomy-joe/u4-decompiled}},
  url = {https://github.com/ergonomy-joe/u4-decompiled},
  urldate = {2026-11-06},
  note = {Awesome REA entry: \url{https://awesomerea.org/resources/ultima-iv-decompiled-case/}}
}

Plain text

Ultima IV: near-matching reconstruction of its DOS executables. https://github.com/ergonomy-joe/u4-decompiled (accessed 2026-11-06). Awesome REA entry: https://awesomerea.org/resources/ultima-iv-decompiled-case/

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Primary sources

README.md GitHub · ergonomy-joe/u4-decompiled · Revision 2185af4