Case study

Ultima IV: a matching Master System rebuild and PC port

Rebuilds the Sega Master System version of Ultima IV: Quest of the Avatar from a disassembly and ports its routines to native C for PC. The ROM build is checked byte for byte against a user-supplied release, while shadow execution compares C rewrites with the original code's state and can also compare timing.

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: 1
Last commit: 2026-11-06
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: A user-supplied 512 KB Europe/USA ROM with SHA1 a90e21e5961bcf2e10b715a009c04e7c2017a3b1.
Prerequisites: Python 3, a POSIX shell and WLA-DX for the ROM build; Zig and SDL2 for the PC port.
Scope: The PC build script targets 64-bit Windows.
License: No licence file in the repository.

Cite

BibTeX

@misc{ultima-iv-sms-recompiled-case,
  title = {{Ultima IV: a matching Master System rebuild and PC port}},
  howpublished = {\url{https://github.com/alexdia25/u4-sms-recompiled}},
  url = {https://github.com/alexdia25/u4-sms-recompiled},
  urldate = {2026-11-06},
  note = {Awesome REA entry: \url{https://awesomerea.org/resources/ultima-iv-sms-recompiled-case/}}
}

Plain text

Ultima IV: a matching Master System rebuild and PC port. https://github.com/alexdia25/u4-sms-recompiled (accessed 2026-11-06). Awesome REA entry: https://awesomerea.org/resources/ultima-iv-sms-recompiled-case/

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About this entry

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Primary sources

README.md GitHub · alexdia25/u4-sms-recompiled · Revision 3837409
docs/architecture.md GitHub · alexdia25/u4-sms-recompiled · Revision 3837409