emulator: Beetle PSX (Mednafen PSX)
type: libretro
core_classification: community_fork
source: "https://github.com/libretro/beetle-psx-libretro"
upstream: "https://mednafen.github.io/"
profiled_date: "2026-03-24"
core_version: "v0.9.44.1"
display_name: "Sony - PlayStation (Beetle PSX)"
cores: [mednafen_psx, mednafen_psx_hw]
systems: [sony-playstation]
notes: >
  Region-based BIOS selection: the core picks JP/NA/EU firmware based on disc region.
  SHA1 validated with warning on mismatch (does not block loading).
  SHA1 and alternate filenames sourced from MAME psx.cpp (libretro.cpp:184).
  Override option allows using PSP or PS3 extracted PS1 BIOS as region-free alternative.
  "Skip BIOS" option patches BIOS ROM but causes compatibility issues.
  Upstream Mednafen loads the same 3 region BIOS; override BIOS are libretro additions.

files:
  # -- Region: Japan (REGION_JP) --

  - name: "scph5500.bin"
    description: "SCPH-5500 (v3.0 09-09-96 J)"
    region: "NTSC-J"
    required: true
    size: 524288
    sha1: "b05def971d8ec59f346f2d9ac21fb742e3eb6917"
    md5: "8dd7d5296a650fac7319bce665a6a53c"
    validation: [sha1]
    mode: both
    source_ref: "libretro.cpp:252-256"
    aliases: ["SCPH5500.bin", "SCPH-5500.bin"]

  # -- Region: North America (REGION_NA) --

  - name: "scph5501.bin"
    description: "SCPH-5501, 5503, 7003 (v3.0 11-18-96 A)"
    region: "NTSC-U"
    required: true
    size: 524288
    sha1: "0555c6fae8906f3f09baf5988f00e55f88e9f30b"
    md5: "490f666e1afb15b7362b406ed1cea246"
    validation: [sha1]
    mode: both
    source_ref: "libretro.cpp:258-270"
    aliases:
      - "SCPH5501.bin"
      - "SCPH-5501.bin"
      - "scph5503.bin"
      - "SCPH5503.bin"
      - "SCPH-5503.bin"
      - "scph7003.bin"
      - "SCPH7003.bin"
      - "SCPH-7003.bin"

  # -- Region: Europe (REGION_EU) --

  - name: "scph5502.bin"
    description: "SCPH-5502, 5552 (v3.0 01-06-97 E)"
    region: "PAL"
    required: true
    size: 524288
    sha1: "f6bc2d1f5eb6593de7d089c425ac681d6fffd3f0"
    md5: "32736f17079d0b2b7024407c39bd3050"
    validation: [sha1]
    mode: both
    source_ref: "libretro.cpp:272-282"
    aliases:
      - "SCPH5502.bin"
      - "SCPH-5502.bin"
      - "scph5552.bin"
      - "SCPH5552.bin"
      - "SCPH-5552.bin"

  # -- Override BIOS (region-free alternatives) --

  - name: "psxonpsp660.bin"
    description: "PSP embedded PS1 BIOS (region-free override)"
    region: "Auto"
    required: false
    size: 524288
    sha1: "96880d1ca92a016ff054be5159bb06fe03cb4e14"
    md5: "c53ca5908936d412331790f4426c6c33"
    validation: [sha1]
    mode: libretro
    source_ref: "libretro.cpp:190-195"
    aliases: ["PSXONPSP660.bin"]
    notes: "override_bios=1. Falls back to region BIOS if not found."

  - name: "ps1_rom.bin"
    description: "PS3 embedded PS1 BIOS (region-free override)"
    region: "Auto"
    required: false
    size: 524288
    sha1: "c40146361eb8cf670b19fdc9759190257803cab7"
    md5: "81bbe60ba7a3d1cea1d48c14cbcc647b"
    validation: [sha1]
    mode: libretro
    source_ref: "libretro.cpp:198-203"
    aliases: ["PS1_ROM.bin"]
    notes: "override_bios=2. Falls back to region BIOS if not found."