emulator: Dolphin MMJR
type: standalone
core_classification: community_fork
source: "https://github.com/acidtech/Dolphin-MMJR"
upstream: "https://github.com/weihuoya/dolphin"
profiled_date: "2026-08-11"
source_commit: "1b095b64857c2eabb49a42cc56ffd9d7881bc263"
core_version: "11460 - bankaimaster999"
display_name: "Nintendo - GameCube / Wii (Dolphin MMJR)"
cores:
  - dolphin-mmjr
systems:
  - nintendo-gamecube
  - nintendo-wii
mode: standalone

notes: |
  Android-only Dolphin fork continuing the MMJ line, published as the org.mm.jr
  package. The repositories it released from are gone, including the
  Dolphin-MMJR1 link in its own README; this reading is taken from a surviving
  copy that carries the release build metadata of the app, applicationId
  org.mm.jr and versionCode 15808.
  ref: Source/Android/app/build.gradle:23-29,
       Source/Android/app/release/output-metadata.json

  Two roots. The user directory is dolphin-mmjr at the root of external
  storage. The Sys directory is extracted from the APK assets into the app's
  internal files directory, and the first run after a versionCode change
  deletes it and extracts it again, so nothing placed there survives an update.
  Paths below are relative to the user directory; entries with no path are read
  only from the Sys directory and name their location in their note.
  ref: Source/Android/app/src/main/java/org/dolphinemu/dolphinemu/utils/DirectoryInitialization.java:93-134,
       Source/Core/Common/CommonPaths.h:22-24, Source/Core/Common/FileUtil.cpp:756-807

  The GameCube boot ROM is looked up as GC/<REGION>/IPL.bin, the region
  directory being NTSC-J to JAP, NTSC-U to USA and PAL to EUR, in the user
  directory first and the Sys directory second. Booting the IPL itself hashes
  the whole file with crc32 and warns on an unknown dump, and again when a PAL
  dump answers a non-PAL boot. SkipIPL defaults to true, so games start without
  it.
  ref: Source/Core/Core/ConfigManager.cpp:835-849, Source/Core/Core/ConfigManager.cpp:861-868,
       Source/Core/Core/Boot/Boot.cpp:295-337, Source/Core/Core/Config/MainSettings.cpp:18

  Fonts follow the IPL. When a dump is present the Shift JIS and Windows-1252
  fonts are read out of it at offsets 0x1aff00 and 0x1fcf00, for 0x4a24d and
  0x2575 bytes; otherwise the standalone font files are loaded whole, and the
  bundled ones have different padding from the console fonts.
  ref: Source/Core/Core/HW/EXI/EXI_DeviceIPL.cpp:99-127,
       Source/Core/Core/HW/EXI/EXI_DeviceIPL.cpp:159-172,
       Source/Core/Core/HW/EXI/EXI_DeviceIPL.cpp:199-240

  DSP HLE is the default and reads dsp_coef.bin alone, for polyphase resampling
  coefficients, skipping any file that is not 0x1000 bytes. DSP LLE, reached by
  setting DSPHLE to False in Dolphin.ini, loads both ROMs from GC/ in the user
  directory then Sys/GC/, rejects either at the wrong size and refuses to start
  when one is missing. Both are byte-swapped into memory and the pair is then
  hashed with adler32 against six known combinations.
  ref: Source/Core/Core/HW/DSPLLE/DSPLLE.cpp:120-138,
       Source/Core/Core/HW/DSPLLE/DSPLLE.cpp:140-176,
       Source/Core/Core/HW/DSPHLE/UCodes/AX.cpp:45-58,
       Source/Core/Core/DSP/DSPCore.cpp:38-105, Source/Core/Core/HW/DSP.cpp:190

  Wii emulation reads keys.bin from the NAND root every time the key store is
  built, and keeps the built-in keys when it is absent. SYSCONF is read through
  the emulated filesystem and rebuilt unless it is exactly 0x4000 bytes,
  setting.txt is read for its serial number then deleted and written again, and
  the WiiConnect24 files shipped in Sys/Wii are copied into the NAND without
  overwriting what is there. A missing SD card image is created at 128 MB.
  ref: Source/Core/Core/IOS/IOSC.cpp:94, Source/Core/Core/IOS/IOSC.cpp:136-140,
       Source/Core/Core/IOS/IOSC.cpp:559-584, Source/Core/Core/SysConf.cpp:55-66,
       Source/Core/Core/Boot/Boot_BS2Emu.cpp:228-256, Source/Core/Core/WiiRoot.cpp:217-227,
       Source/Core/Core/IOS/SDIO/SDIOSlot0.cpp:60-79

  Every boot looks for a symbol map named after the running game ID, in Maps/
  then Sys/Maps/, and reloads it whenever the running title changes. The game
  ID comes from the disc metadata, not from a debugger setting.
  ref: Source/Core/Core/Boot/Boot.cpp:253-290, Source/Core/Core/ConfigManager.cpp:698-720,
       Source/Core/Core/ConfigManager.cpp:742-754

files:
  - name: IPL.bin
    path: GC/USA/IPL.bin
    system: nintendo-gamecube
    required: false
    hle_fallback: true
    region: [north-america]
    size: 2097152
    validation: [crc32]
    description: "GameCube boot ROM, NTSC-U directory"
    note: "Read whole into a 2 MiB buffer with no size check, then descrambled from 0x100 for 0x1afe00 bytes. The crc32 gate runs when the IPL itself is booted, and the four non-PAL dumps pass here without complaint."
    source_ref: "Source/Core/Core/ConfigManager.cpp:861-868, Source/Core/Core/HW/EXI/EXI_DeviceIPL.cpp:99-112, Source/Core/Core/HW/EXI/EXI_DeviceIPL.h:43, Source/Core/Core/Boot/Boot.cpp:296-330"

  - name: IPL.bin
    path: GC/EUR/IPL.bin
    system: nintendo-gamecube
    required: false
    hle_fallback: true
    region: [europe]
    size: 2097152
    validation: [crc32]
    description: "GameCube boot ROM, PAL directory"
    note: "The two PAL dumps are the ones this directory takes without a mismatch warning."
    source_ref: "Source/Core/Core/ConfigManager.cpp:835-849, Source/Core/Core/Boot/Boot.cpp:298-337"

  - name: IPL.bin
    path: GC/JAP/IPL.bin
    system: nintendo-gamecube
    required: false
    hle_fallback: true
    region: [japan]
    size: 2097152
    validation: [crc32]
    description: "GameCube boot ROM, NTSC-J directory"
    note: "JAP is the only Japanese directory name this fork knows. FindIPLDump, which serves the font path, scans USA then EUR then JAP and stops at the first hit."
    source_ref: "Source/Core/Common/CommonPaths.h:32-34, Source/Core/Core/HW/EXI/EXI_DeviceIPL.cpp:174-186"

  - name: font_western.bin
    path: null
    required: false
    hle_fallback: true
    description: "Windows-1252 font, loaded at 0x1fcf00"
    note: "Read from GC/ in the Sys directory, with no user directory fallback. Skipped in favour of the IPL dump whenever one is found."
    source_ref: "Source/Core/Common/CommonPaths.h:105, Source/Core/Core/HW/EXI/EXI_DeviceIPL.cpp:126, Source/Core/Core/HW/EXI/EXI_DeviceIPL.cpp:199-240"

  - name: font_japanese.bin
    path: null
    required: false
    hle_fallback: true
    description: "Shift JIS font, loaded at 0x1aff00"
    note: "Read from GC/ in the Sys directory, with no user directory fallback. Skipped in favour of the IPL dump whenever one is found."
    source_ref: "Source/Core/Common/CommonPaths.h:106, Source/Core/Core/HW/EXI/EXI_DeviceIPL.cpp:125, Source/Core/Core/HW/EXI/EXI_DeviceIPL.cpp:199-240"

  - name: dsp_rom.bin
    path: GC/dsp_rom.bin
    required: false
    hle_fallback: true
    size: 8192
    validation: [size]
    known_hash_adler32: "0x66f334fe"
    adler32_byteswap: true
    description: "DSP instruction ROM"
    note: "DSP LLE only, and LLE aborts when the file is absent or not 8192 bytes. The adler32 is taken over the byte-swapped image and the value here is the Nintendo pair; five replacement pairs are also accepted."
    source_ref: "Source/Core/Common/CommonPaths.h:108, Source/Core/Core/HW/DSPLLE/DSPLLE.cpp:120-152, Source/Core/Core/DSP/DSPCore.h:35, Source/Core/Core/DSP/DSPCore.cpp:38-80"

  - name: dsp_coef.bin
    path: GC/dsp_coef.bin
    required: false
    hle_fallback: true
    size: 4096
    validation: [size]
    known_hash_adler32: "0xf3b93527"
    adler32_byteswap: true
    description: "DSP coefficient ROM"
    note: "Read by DSP LLE alongside the instruction ROM, and by the AX ucode under HLE for polyphase resampling, which drops any file that is not 0x1000 bytes and plays on without it."
    source_ref: "Source/Core/Common/CommonPaths.h:109, Source/Core/Core/HW/DSPLLE/DSPLLE.cpp:120-152, Source/Core/Core/HW/DSPHLE/UCodes/AX.cpp:45-70, Source/Core/Core/DSP/DSPCore.h:49"

  - name: codehandler.bin
    path: null
    required: false
    description: "Gecko code handler"
    note: "Read from the root of the Sys directory when cheats are enabled, and written into guest memory between the installer bounds; too large a file is refused and cheats stay off."
    source_ref: "Source/Core/Common/CommonPaths.h:124, Source/Core/Core/GeckoCode.cpp:121-136"

  - name: keys.bin
    path: Wii/keys.bin
    system: nintendo-wii
    required: false
    hle_fallback: true
    size: 1024
    validation: [size]
    description: "BootMii key dump, console keys and identity"
    note: "Read at every key store construction, so on every Wii title. Supplies the console private key and signature, the MS and CA identifiers, the NAND key and HMAC and the backup key. A short read leaves the built-in keys in place, the structure being fixed at 0x400 bytes."
    source_ref: "Source/Core/Core/IOS/IOSC.cpp:94, Source/Core/Core/IOS/IOSC.cpp:136-140, Source/Core/Core/IOS/IOSC.cpp:559-584"

  - name: SYSCONF
    path: Wii/shared2/sys/SYSCONF
    system: nintendo-wii
    required: false
    hle_fallback: true
    size: 16384
    validation: [size]
    description: "Wii system configuration"
    note: "Opened through the emulated filesystem and accepted only at 0x4000 bytes; anything else is replaced by a freshly generated one."
    source_ref: "Source/Core/Common/CommonPaths.h:90, Source/Core/Core/SysConf.cpp:20, Source/Core/Core/SysConf.cpp:55-66"

  - name: setting.txt
    path: Wii/title/00000001/00000002/data/setting.txt
    system: nintendo-wii
    required: false
    hle_fallback: true
    size: 256
    validation: [size]
    description: "Wii region and language settings"
    note: "Read for its serial number at Wii boot, then deleted and written again from the emulated region settings. The read fills a fixed 0x100 byte buffer, so a shorter file yields nothing."
    source_ref: "Source/Core/Common/CommonPaths.h:122, Source/Core/Common/SettingsHandler.h:22-27, Source/Core/Core/Boot/Boot_BS2Emu.cpp:228-256"

  - name: sd.raw
    path: Wii/sd.raw
    system: nintendo-wii
    required: false
    hle_fallback: true
    description: "Wii SD card image"
    note: "Opened read-write when the SD device is opened; a 128 MB image is created when the file is missing."
    source_ref: "Source/Core/Common/CommonPaths.h:119, Source/Core/Common/FileUtil.cpp:802, Source/Core/Core/IOS/SDIO/SDIOSlot0.cpp:60-79"

  - name: wiitdb.txt
    path: Load/wiitdb.txt
    aliases: [titles.txt]
    required: false
    description: "user title database"
    note: "One title id equals name pair per line, ids of four characters and up. titles.txt is read only when wiitdb.txt yields nothing. Overlays the per-language databases shipped in the Sys directory."
    source_ref: "Source/Core/Core/TitleDatabase.cpp:26-48, Source/Core/Core/TitleDatabase.cpp:50-63, Source/Core/Core/TitleDatabase.cpp:86-94"

  - name: mios-ipl.map
    path: Maps/mios-ipl.map
    required: false
    description: "MIOS symbol map"
    note: "Read from Maps/ in the user directory when MIOS starts, and a successful load re-applies the HLE function patches against the symbols it names."
    source_ref: "Source/Core/Core/IOS/MIOS.cpp:47, Source/Core/Core/IOS/MIOS.cpp:55-66"

  - name: GFZE01.map
    path: null
    required: false
    description: "symbol map for game id GFZE01"
    note: "Reached by the per-title lookup, which reads Maps/<game id>.map from the user directory then the Sys directory. Ships in Maps/ inside the Sys directory."
    source_ref: "Source/Core/Core/Boot/Boot.cpp:253-290"

  - name: GMBE8P.map
    path: null
    required: false
    description: "symbol map for game id GMBE8P"
    note: "Reached by the per-title lookup, which reads Maps/<game id>.map from the user directory then the Sys directory. Ships in Maps/ inside the Sys directory."
    source_ref: "Source/Core/Core/Boot/Boot.cpp:253-290"

valid_bios_crc32:
  ipl_ntsc:
    - { crc32: "6DAC1F2A", name: "NTSC v1.0" }
    - { crc32: "D5E6FEEA", name: "NTSC v1.1" }
    - { crc32: "86573808", name: "NTSC v1.2" }
    - { crc32: "667D0B64", name: "MPAL v1.1 (Brazil)" }
  ipl_pal:
    - { crc32: "4F319F43", name: "PAL v1.0" }
    - { crc32: "AD1B7F16", name: "PAL v1.2" }

exclusion_note: >
  The NAND importer, which reads nand.bin and writes clientca.pem,
  clientcakey.pem and rootca.pem, and the signature database totaldb.dsy are
  reachable only from the Qt front-end, which the Android build does not
  compile: the APK builds the core libraries and Source/Android/jni, and the
  JNI surface exposes no NAND import or WAD install. libusb is switched off for
  Android, so the Bluetooth passthrough firmware paths are out as well.
  ref: Source/CMakeLists.txt:60-65, Source/Core/CMakeLists.txt:1-16,
       Source/Core/DolphinQt/MainWindow.cpp:1510, Source/Core/DolphinQt/MenuBar.cpp:1092,
       Source/Core/DolphinQt/MenuBar.cpp:1156, CMakeLists.txt:630-644