{
  "added_at": "2026-11-09",
  "additional_evidence_urls": [
    "https://github.com/alexdia25/u4-sms-recompiled/blob/38374090ab30305e14dfabc03991e3c3f0c98a76/docs/architecture.md"
  ],
  "category": "reconstruction-cases",
  "class": "game",
  "description_en": "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.",
  "description_zh": "项目从反汇编重建 Sega Master System 版 Ultima IV: Quest of the Avatar，并以原生 C 例程制作 PC 移植版。ROM 构建与用户提供的版本逐字节比较；影子执行比较 C 重写例程与原代码的状态，也可启用时序比较。",
  "entry_url": "https://awesomerea.org/resources/ultima-iv-sms-recompiled-case/",
  "entry_url_zh": "https://awesomerea.org/zh/resources/ultima-iv-sms-recompiled-case/",
  "evidence_class": 2,
  "evidence_status": "observed",
  "evidence_url": "https://github.com/alexdia25/u4-sms-recompiled/blob/38374090ab30305e14dfabc03991e3c3f0c98a76/README.md",
  "group": "cases",
  "id": "ultima-iv-sms-recompiled-case",
  "json_url": "https://awesomerea.org/resources/ultima-iv-sms-recompiled-case/record.json",
  "kind": "case-study",
  "markdown_url": "https://awesomerea.org/resources/ultima-iv-sms-recompiled-case/index.md",
  "markdown_url_zh": "https://awesomerea.org/zh/resources/ultima-iv-sms-recompiled-case/index.md",
  "name": "Ultima IV: a matching Master System rebuild and PC port",
  "name_zh": "Ultima IV：Master System 匹配重建与 PC 移植",
  "reconstruction_method": "port",
  "record_type": "resource",
  "relationship": "independent-reconstruction",
  "requirement_facets": [
    "prerequisites",
    "prerequisites",
    "scope",
    "license"
  ],
  "requirements": [
    "A user-supplied 512 KB Europe/USA ROM with SHA1 a90e21e5961bcf2e10b715a009c04e7c2017a3b1.",
    "Python 3, a POSIX shell and WLA-DX for the ROM build; Zig and SDL2 for the PC port.",
    "The PC build script targets 64-bit Windows.",
    "No licence file in the repository."
  ],
  "requirements_zh": [
    "需要用户提供 SHA1 为 a90e21e5961bcf2e10b715a009c04e7c2017a3b1 的 512 KB 欧美版 ROM。",
    "ROM 构建需要 Python 3、POSIX shell 和 WLA-DX；PC 移植另需 Zig 和 SDL2。",
    "PC 构建脚本面向 64 位 Windows。",
    "仓库中没有许可证文件。"
  ],
  "scope": "unknown",
  "targets": [
    "game"
  ],
  "url": "https://github.com/alexdia25/u4-sms-recompiled",
  "verification": "source-reviewed",
  "verified_at": "2026-11-06"
}