emulator: PCSX2
type: standalone
core_classification: official_port
bios_mode: agnostic
source: "https://github.com/PCSX2/pcsx2"
upstream: "https://github.com/PCSX2/pcsx2"
cores:
  - pcsx2
profiled_date: "2026-03-30"
core_version: "Git"
display_name: "Sony - PlayStation 2 (PCSX2)"
systems: [sony-playstation-2]

notes: |
  Filename-agnostic BIOS detection. Scans bios/ for any file between 4-8 MB
  with valid romdir structure (RESET + ROMVER entries). No hash validation.
  Companion files (.rom1, .rom2, .nvm, .mec) derive paths from selected BIOS.
  ROM1 (DVD player) and ROM2 (Chinese extension) silently skipped if missing.
  NVM and MEC auto-created with defaults if missing.

files:
  - name: ps2-0230a-20080220.bin
    required: true
    min_size: 4194304
    max_size: 8388608
    validation: [size]
    source_ref: "pcsx2/ps2/BiosTools.cpp:258-362"
    note: "Accepts any file 4-8 MB with valid romdir (RESET + ROMVER). Naming convention ps2-VVVVr-YYYYMMDD.bin (version, region, date)."

  - name: rom1.bin
    required: false
    max_size: 4194304
    source_ref: "pcsx2/ps2/BiosTools.cpp:214-241,366"
    note: "DVD player ROM. Tries {biospath}.rom1 then {biosbase}.rom1. Silently skipped if missing."

  - name: ROM2.BIN
    required: false
    max_size: 4194304
    source_ref: "pcsx2/ps2/BiosTools.cpp:214-241,367"
    note: "Chinese ROM extension. Same naming convention as rom1. Only present on Chinese region consoles."

  - name: EROM.BIN
    required: false
    source_ref: "pcsx2/ps2/BiosTools.cpp"
    note: "Extended ROM. Present in some BIOS dumps but not loaded by PCSX2 code via LoadExtraRom."
    path: null

  - name: eeprom.dat
    required: false
    hle_fallback: true
    size: 64
    source_ref: "pcsx2/DEV9/DEV9.cpp:110-160"
    note: "DEV9 network adapter EEPROM. Falls back to built-in defaults if missing."

  - name: GameIndex.yaml
    path: pcsx2/resources/GameIndex.yaml
    required: false
    mode: libretro
    source_ref: "pcsx2/GameDatabase.cpp:48,880"
    note: "Game compatibility database. OSD warning if missing."

  - name: cheats_ws.zip
    path: pcsx2/resources/cheats_ws.zip
    required: false
    mode: libretro
    source_ref: "pcsx2/VMManager.cpp:340-353"
    note: "Widescreen patches archive."

  - name: cheats_ni.zip
    path: pcsx2/resources/cheats_ni.zip
    required: false
    mode: libretro
    source_ref: "pcsx2/VMManager.cpp:375-388"
    note: "No-interlacing patches archive."