Citra - RetroBIOS¶
Technical notes
Citra 3DS emulator. Upstream taken down March 2024 (Nintendo lawsuit). Mirror: https://github.com/citra-mirror/citra Data dir: {save_dir}/Citra/ or {system_dir}/Citra/ ref: src/citra_libretro/citra_libretro.cpp:460-466
HLE for most services. Embedded open-source replacements for shared font, Mii data, country list, and bad word list compiled into the binary. ref: src/core/file_sys/archive_ncch.cpp:9-27, 133-167
firmware_count absent in .info (= 0). All files optional.
4 files | 0 required, 4 optional | 4 in repo, 0 missing | 1 with HLE fallback
aes_keys.txt optional in repo
AES encryption keys
- Path:
Citra/sysdata/aes_keys.txt - System: nintendo-3ds
- Source:
src/core/hw/aes/key.cpp:207-208 - Platforms: bizhawk, emudeck, retrodeck
- needed for encrypted games
boot9.bin optional in repo
ARM9 bootrom
- Path:
Citra/sysdata/boot9.bin - System: nintendo-3ds
- Size: 64.0 KB
- Validation: size
- Source:
src/core/hw/aes/key.cpp:162-172,src/core/hw/rsa/rsa.cpp:55-65 - provides AES and RSA keys
shared_font.bin optional in repo HLE fallback
system shared font (legacy format)
- Path:
Citra/sysdata/shared_font.bin - System: nintendo-3ds
- Source:
src/core/hle/service/apt/apt.cpp:259-267 - fallback to embedded open-source replacement font
seeddb.bin optional in repo
game seed database
- Path:
Citra/sysdata/seeddb.bin - System: nintendo-3ds
- Source:
src/core/file_sys/seed_db.cpp:13-27 - Platforms: bizhawk
- needed for seed-encrypted games (9.6+ titles), creates empty if missing
Generated on 2026-09-14T09:03:09Z