Case study

XU4: a reconstruction of Ultima IV

XU4 recreates Ultima IV for modern systems while loading the original DOS game's data at runtime. Its implementation supports original EGA and upgraded VGA graphics, and its documentation maps file structures such as SHAPES.EGA.

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

Stars: 73
Last commit: 2025-06-05
Language: C++
License (GitHub): GPL-3.0
Status: Archived

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: A copy of Ultima IV for DOS is required for runtime data.
Scope: Linux is the primary development platform; Windows builds are also described.
License: GPL-3.0 license.

Cite

BibTeX

@misc{xu4-ultima-iv-case,
  title = {{XU4: a reconstruction of Ultima IV}},
  howpublished = {\url{https://github.com/xu4-engine/u4}},
  url = {https://github.com/xu4-engine/u4},
  urldate = {2026-11-06},
  note = {Awesome REA entry: \url{https://awesomerea.org/resources/xu4-ultima-iv-case/}}
}

Plain text

XU4: a reconstruction of Ultima IV. https://github.com/xu4-engine/u4 (accessed 2026-11-06). Awesome REA entry: https://awesomerea.org/resources/xu4-ultima-iv-case/

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About this entry

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Primary sources

README.md GitHub · xu4-engine/u4 · Revision 6a7ee3d
doc/FileFormats.md GitHub · xu4-engine/u4 · Revision 6a7ee3d