libretro/emulators/mesen-s.yml

# mesen-s - SNES / Game Boy / Game Boy Color emulator
# Profiled from: libretro/Mesen-S (libretro port) + SourMesen/Mesen-S (upstream)

emulator: mesen-s
display_name: "Mesen-S"
type: libretro
core_classification: official_port
source: "https://github.com/libretro/Mesen-S"
upstream: "https://github.com/SourMesen/Mesen-S"
profiled_date: "2026-03-24"
source_commit: "9e4fdeb9b336470bc96beb8765b2e79c86a2da1e"
upstream_commit: "89199f298a95345a893d814525b6668567a6d490"
core_version: "0.4.0"
cores: [mesen-s, mesen_s]
systems: [nintendo-snes, nintendo-gb, nintendo-gbc, nintendo-super-game-boy, nintendo-satellaview]

notes: >
  High-accuracy SNES/SFC emulator with Game Boy/Color and Super Game Boy
  support. Upstream archived at 0.4.0, superseded by Mesen2. DSP firmware
  can be loaded as combined files (dsp1.rom, dsp1b.rom, dsp2.rom, dsp3.rom,
  dsp4.rom, st010.rom, st011.rom) or split program/data ROMs. Combined
  files are tried first, size validated. HLE coprocessor option available
  for DSP-1/DSP-1B only (libretro core option mesen-s_hle_coprocessor).
  CX4 is fully HLE, no firmware needed. ST018 detected but not emulated.
  GB/GBC/SGB boot ROMs fall back to embedded open-source SameBoy boot ROMs
  when external files are not found.

files:
  # -- NEC uPD7725 DSP firmware (split format) --
  # Combined format also accepted: dsp1.rom (8192), dsp1b.rom (8192),
  # dsp2.rom (8192), dsp3.rom (8192), dsp4.rom (8192)

  - name: "dsp1.program.rom"
    size: 6144
    required: false
    hle_fallback: true
    validation: [size]
    note: "DSP-1 program ROM. HLE fallback in libretro port only"
    source_ref: "upstream Core/NecDsp.cpp:95, source Core/FirmwareHelper.h:17-35"

  - name: "dsp1.data.rom"
    size: 2048
    required: false
    hle_fallback: true
    validation: [size]
    note: "DSP-1 data ROM"
    source_ref: "upstream Core/NecDsp.cpp:95, source Core/FirmwareHelper.h:17-35"

  - name: "dsp1b.program.rom"
    size: 6144
    required: false
    hle_fallback: true
    validation: [size]
    note: "DSP-1B program ROM. HLE fallback in libretro port only"
    source_ref: "upstream Core/NecDsp.cpp:96"

  - name: "dsp1b.data.rom"
    size: 2048
    required: false
    hle_fallback: true
    validation: [size]
    note: "DSP-1B data ROM"
    source_ref: "upstream Core/NecDsp.cpp:96"

  - name: "dsp2.program.rom"
    size: 6144
    required: false
    validation: [size]
    note: "DSP-2 program ROM"
    source_ref: "upstream Core/NecDsp.cpp:97"

  - name: "dsp2.data.rom"
    size: 2048
    required: false
    validation: [size]
    note: "DSP-2 data ROM"
    source_ref: "upstream Core/NecDsp.cpp:97"

  - name: "dsp3.program.rom"
    size: 6144
    required: false
    validation: [size]
    note: "DSP-3 program ROM"
    source_ref: "upstream Core/NecDsp.cpp:98"

  - name: "dsp3.data.rom"
    size: 2048
    required: false
    validation: [size]
    note: "DSP-3 data ROM"
    source_ref: "upstream Core/NecDsp.cpp:98"

  - name: "dsp4.program.rom"
    size: 6144
    required: false
    validation: [size]
    note: "DSP-4 program ROM"
    source_ref: "upstream Core/NecDsp.cpp:99"

  - name: "dsp4.data.rom"
    size: 2048
    required: false
    validation: [size]
    note: "DSP-4 data ROM"
    source_ref: "upstream Core/NecDsp.cpp:99"

  # -- NEC uPD96050 coprocessor firmware (split format) --
  # Combined format also accepted: st010.rom (53248), st011.rom (53248)

  - name: "st010.program.rom"
    size: 49152
    required: false
    validation: [size]
    note: "ST-010 program ROM"
    source_ref: "upstream Core/NecDsp.cpp:100"

  - name: "st010.data.rom"
    size: 4096
    required: false
    validation: [size]
    note: "ST-010 data ROM"
    source_ref: "upstream Core/NecDsp.cpp:100"

  - name: "st011.program.rom"
    size: 49152
    required: false
    validation: [size]
    note: "ST-011 program ROM"
    source_ref: "upstream Core/NecDsp.cpp:101"

  - name: "st011.data.rom"
    size: 4096
    required: false
    validation: [size]
    note: "ST-011 data ROM"
    source_ref: "upstream Core/NecDsp.cpp:101"

  # -- Game Boy boot ROMs --

  - name: "dmg_boot.bin"
    size: 256
    required: false
    hle_fallback: true
    aliases: [gb_bios.bin]
    validation: [size]
    note: "Game Boy (DMG) boot ROM. Falls back to embedded SameBoy open-source boot ROM"
    source_ref: "source Core/FirmwareHelper.h:148, source Core/Gameboy.cpp:108-114, source Core/GbBootRom.h:7"

  - name: "cgb_boot.bin"
    size: 2304
    required: false
    hle_fallback: true
    aliases: [gbc_bios.bin]
    validation: [size]
    note: "Game Boy Color boot ROM. Falls back to embedded SameBoy open-source boot ROM"
    source_ref: "source Core/FirmwareHelper.h:149, source Core/Gameboy.cpp:108-119, source Core/GbBootRom.h:83"

  - name: "sgb_boot.bin"
    size: 256
    required: false
    hle_fallback: true
    aliases: [sgb_bios.bin]
    validation: [size]
    note: "Super Game Boy boot ROM for GB CPU. Falls back to embedded SameBoy open-source boot ROM"
    source_ref: "source Core/FirmwareHelper.h:150, source Core/Gameboy.cpp:108-127, source Core/GbBootRom.h:32"

  - name: "sgb2_boot.bin"
    size: 256
    required: false
    hle_fallback: true
    aliases: [sgb_bios.bin]
    validation: [size]
    note: "Super Game Boy 2 boot ROM for GB CPU. Falls back to embedded SameBoy open-source boot ROM"
    source_ref: "source Core/FirmwareHelper.h:151, source Core/Gameboy.cpp:108-127, source Core/GbBootRom.h:57"

  # -- Super Game Boy cartridge ROMs --

  - name: "SGB1.sfc"
    size: 262144
    required: false
    validation: [size]
    note: "Super Game Boy SNES cartridge ROM. Without it, SGB mode falls back to regular GB"
    source_ref: "upstream Core/FirmwareHelper.h:118-133, source Core/BaseCartridge.cpp:630-638"

  - name: "SGB2.sfc"
    size: 524288
    required: false
    validation: [size]
    note: "Super Game Boy 2 SNES cartridge ROM. Core option mesen-s_sgb2 selects SGB version"
    source_ref: "upstream Core/FirmwareHelper.h:118-133, source Core/BaseCartridge.cpp:630-638"

  # -- Satellaview --

  - name: "BS-X.bin"
    size: 1048576
    required: false
    validation: [size]
    note: "Satellaview BS-X BIOS ROM. Minimum accepted size is 32768 bytes"
    source_ref: "source Core/FirmwareHelper.h:39-47, 96-113, source Core/BaseCartridge.cpp:65"