{
  "added_at": "2026-10-16",
  "category": "official-case-studies",
  "description_en": "Inspect a 16-bit PC-98 DOS helper and relate its angle calculation to a pinned reconstruction and historical compiler checks.",
  "description_zh": "检查 PC-98 DOS 的 16 位弹幕角度辅助函数，并关联固定版本重建与历史编译器检查。",
  "entry_url": "https://awesomerea.org/resources/rea-th04-case/",
  "entry_url_zh": "https://awesomerea.org/zh/resources/rea-th04-case/",
  "evidence_url": "https://github.com/morluto/rea/blob/808339f0b1cf3837445f392b5d5f1f362d64a27d/website/evidence/th04-bullet-ring.md",
  "group": "rea",
  "id": "rea-th04-case",
  "json_url": "https://awesomerea.org/resources/rea-th04-case/record.json",
  "kind": "case-study",
  "markdown_url": "https://awesomerea.org/resources/rea-th04-case/index.md",
  "markdown_url_zh": "https://awesomerea.org/zh/resources/rea-th04-case/index.md",
  "name": "TH04: recover a DOS bullet-ring helper",
  "name_zh": "TH04：恢复 DOS 子弹环辅助函数",
  "reconstruction_method": "other",
  "record_type": "resource",
  "relationship": "official-case-study",
  "requirement_facets": [
    "prerequisites",
    "scope"
  ],
  "requirements": [
    "The matching original TH04 MAIN.EXE and the documented Ghidra DOS load profile.",
    "The showcase covers one helper."
  ],
  "requirements_zh": [
    "需要匹配的 TH04 原版 MAIN.EXE 及文档说明的 Ghidra DOS 加载配置。",
    "展示只覆盖一个辅助函数。"
  ],
  "targets": [
    "binary",
    "game"
  ],
  "url": "https://rea.tools/showcase/th04/",
  "verification": "source-reviewed",
  "verified_at": "2026-10-15"
}