emulator: skyemu
type: standalone + libretro
core_classification: official_port
source: https://github.com/skylersaleh/SkyEmu/blob/v5/src/libretro.c
upstream: https://github.com/skylersaleh/SkyEmu
profiled_date: "2026-03-25"
core_version: "v5"
display_name: "Nintendo - Game Boy/GBA/NDS (SkyEmu)"

cores:
  - skyemu

systems:
  - nintendo-gb
  - nintendo-gbc
  - nintendo-gba
  - nintendo-ds

notes: |
  Multi-system emulator by skylersaleh. Libretro core built from the upstream repo.
  All BIOS optional; bundles Cult-of-GBA BIOS (GBA), DraStic free BIOS (NDS ARM7/ARM9),
  stub firmware (NDS), and HLE boot skip (GB/GBC). BIOS loading controlled by core options
  (default: on). Files loaded from system_dir/SkyEmu/ subdirectory.
  Standalone validates exact BIOS file size; libretro only rejects files exceeding buffer.
  .info missing gb_bios.bin (gb.h:1603).

files:
  - name: cgb_boot.bin
    description: GBC boot ROM
    path: SkyEmu/cgb_boot.bin
    required: false
    hle_fallback: true
    aliases: [gbc_bios.bin, cgb0_boot.bin, cgb_agb_boot.bin]
    source_ref: "src/gb.h:1593-1596, 1605-1608"

  - name: dmg_rom.bin
    description: DMG boot ROM
    path: SkyEmu/dmg_rom.bin
    required: false
    hle_fallback: true
    aliases: [dmg0_rom.bin, gb_bios.bin]
    source_ref: "src/gb.h:1601-1603"

  - name: gba_bios.bin
    description: GBA BIOS
    path: SkyEmu/gba_bios.bin
    required: false
    hle_fallback: true
    source_ref: "src/gba.h:1726-1730"

  - name: nds7.bin
    description: NDS ARM7 BIOS
    path: SkyEmu/nds7.bin
    required: false
    hle_fallback: true
    source_ref: "src/nds.h:3088-3089"

  - name: nds9.bin
    description: NDS ARM9 BIOS
    path: SkyEmu/nds9.bin
    required: false
    hle_fallback: true
    source_ref: "src/nds.h:3091-3092"

  - name: firmware.bin
    description: NDS firmware
    path: SkyEmu/firmware.bin
    required: false
    hle_fallback: true
    source_ref: "src/nds.h:3094, 3200-3268"