Case study

Castle Excellent: shared-source NES reconstruction with Castlequest

Reconstructs Castle Excellent for Famicom and Castlequest for NES from shared ca65 assembly source. The build extracts private assets from users' ROMs and compares each revision byte for byte; MAME attract-mode checks cover selected behavior after code relocation.

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

Stars: 1
Last commit: 2026-11-05
Language: Assembly

GitHub data as of 2026-11-09

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Requirements & limits

Prerequisites: Requires Python 3.11+, GNU Make, Retrolarium Kit, and a user-supplied Castle Excellent ROM; Castlequest verification needs its US ROM as well.
Testing evidence: Attract-mode checks cover the title-room demo path, without room changes, deaths, lifts, or Witch behavior.
License: No licence file in the repository.

Cite

BibTeX

@misc{castle-excellent-castlequest-reconstruction-case,
  title = {{Castle Excellent: shared-source NES reconstruction with Castlequest}},
  howpublished = {\url{https://github.com/RetrolariumLab/castle_excellent_src}},
  url = {https://github.com/RetrolariumLab/castle_excellent_src},
  urldate = {2026-11-06},
  note = {Awesome REA entry: \url{https://awesomerea.org/resources/castle-excellent-castlequest-reconstruction-case/}}
}

Plain text

Castle Excellent: shared-source NES reconstruction with Castlequest. https://github.com/RetrolariumLab/castle_excellent_src (accessed 2026-11-06). Awesome REA entry: https://awesomerea.org/resources/castle-excellent-castlequest-reconstruction-case/

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About this entry

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Primary sources

README.md GitHub · RetrolariumLab/castle_excellent_src · Revision 7ff7ff6
docs/architecture.md GitHub · RetrolariumLab/castle_excellent_src · Revision 7ff7ff6