emulator: swanstation
type: libretro
core_classification: community_fork
source: "https://github.com/libretro/swanstation"
upstream: "https://github.com/stenzek/duckstation"
profiled_date: "2026-03-25"
core_version: "v0.1"
display_name: "Sony - PlayStation (SwanStation)"
cores: [swanstation]
systems: [sony-playstation]
notes: |
  Fork of DuckStation maintained by the libretro community after stenzek removed
  libretro support. Frozen at an early DuckStation state.

  BIOS is required to boot. No HLE fallback.
  ref: src/core/system.cpp:667-674 (GetBIOSImage fails = Shutdown)

  Auto-detects BIOS by scanning system_dir for files of known sizes.
  ref: src/core/host_interface.cpp:183-243 (FindBIOSImageInDirectory)
  Accepts PS1 (512 KB), PS2 (4 MB), and PS3 (0x3E66F0) BIOS images.
  Only the first 512 KB are loaded (bios.cpp:83, Image(BIOS_SIZE)).
  ref: src/core/bios.h:9 (BIOS_SIZE=0x80000, BIOS_SIZE_PS2=0x400000, BIOS_SIZE_PS3=0x3E66F0)

  27 known BIOS entries identified by MD5 hash (all PS1 variants).
  ref: src/core/bios.cpp:27-70 (s_image_infos)
  Each entry has: description, region, hash, patch_compatible flag.

  Upstream DuckStation has evolved significantly (105 entries, PS2 BIOS, OpenBIOS,
  priority system). SwanStation is frozen at the fork point.

files:
  - name: "scph5500.bin"
    description: "SCPH-5500 (v3.0 09-09-96 J)"
    region: "NTSC-J"
    required: false
    md5: "8dd7d5296a650fac7319bce665a6a53c"
    size: 524288
    validation: [size, md5]
    source_ref: "src/core/bios.cpp:47"
    aliases: []

  - name: "scph5501.bin"
    description: "SCPH-5501, 5503, 7003 (v3.0 11-18-96 A)"
    region: "NTSC-U"
    required: false
    md5: "490f666e1afb15b7362b406ed1cea246"
    size: 524288
    validation: [size, md5]
    source_ref: "src/core/bios.cpp:48-49"
    aliases: []

  - name: "scph5502.bin"
    description: "SCPH-5502, 5552 (v3.0 01-06-97 E)"
    region: "PAL"
    required: false
    md5: "32736f17079d0b2b7024407c39bd3050"
    size: 524288
    validation: [size, md5]
    source_ref: "src/core/bios.cpp:50-51"
    aliases: []

  - name: "psxonpsp660.bin"
    description: "PSP, SCPH-1000R (v4.5 05-25-00 J)"
    region: "Auto"
    required: false
    md5: "c53ca5908936d412331790f4426c6c33"
    size: 524288
    validation: [size, md5]
    source_ref: "src/core/bios.cpp:65-66"
    aliases: []

  - name: "ps1_rom.bin"
    description: "PS3 embedded PS1 BIOS (v5.0 06-23-03 A)"
    region: "Auto"
    required: false
    md5: "81bbe60ba7a3d1cea1d48c14cbcc647b"
    size: [524288, 4194304, 4089584]
    validation: [size, md5]
    note: "Accepts PS1 (512KB), PS2 (4MB), and PS3 (0x3E66F0) sizes. Only first 512KB used."
    source_ref: "src/core/bios.h:9, src/core/bios.cpp:70,83"
    aliases: []