PCSX2 - RetroBIOS

Type	standalone
Classification	Official ports
Source	https://github.com/PCSX2/pcsx2
Version	Git
Profiled	2026-03-30
Cores	pcsx2
Systems	sony-playstation-2

Technical 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.

8 files | 1 required, 7 optional | 8 in repo, 0 missing | 1 with HLE fallback

ps2-0230a-20080220.bin required in repo

• Size: min 4.0 MB, max 8.0 MB
• Validation: size
• Source: pcsx2/ps2/BiosTools.cpp:258-362
• Platforms: batocera, lakka, recalbox, retroarch, retrobat, retrodeck, retropie, rocknix, romm
• Accepts any file 4-8 MB with valid romdir (RESET + ROMVER). Naming convention ps2-VVVVr-YYYYMMDD.bin (version, region, date).

rom1.bin optional in repo

• Size: max 4.0 MB
• Source: pcsx2/ps2/BiosTools.cpp:214-241, pcsx2/ps2/BiosTools.cpp:366
• DVD player ROM. Tries {biospath}.rom1 then {biosbase}.rom1. Silently skipped if missing.

ROM2.BIN optional in repo

• Size: max 4.0 MB
• Source: pcsx2/ps2/BiosTools.cpp:214-241, pcsx2/ps2/BiosTools.cpp:367
• Platforms: lakka, retroarch, retropie
• Chinese ROM extension. Same naming convention as rom1. Only present on Chinese region consoles.

EROM.BIN optional in repo

• Source: pcsx2/ps2/BiosTools.cpp
• Extended ROM. Present in some BIOS dumps but not loaded by PCSX2 code via LoadExtraRom.

eeprom.dat optional in repo HLE fallback

• Size: 64 B
• Source: pcsx2/DEV9/DEV9.cpp:110-160
• DEV9 network adapter EEPROM. Falls back to built-in defaults if missing.

GameIndex.yaml optional in repo libretro

• Path: pcsx2/resources/GameIndex.yaml
• Source: pcsx2/GameDatabase.cpp:46, pcsx2/GameDatabase.cpp:896
• Platforms: lakka, retroarch, retropie
• Game compatibility database. OSD warning if missing.

cheats_ws.zip optional in repo libretro

• Path: pcsx2/resources/cheats_ws.zip
• Source: pcsx2/VMManager.cpp:346-359
• Widescreen patches archive.

cheats_ni.zip optional in repo libretro

• Path: pcsx2/resources/cheats_ni.zip
• Source: pcsx2/VMManager.cpp:381-394
• No-interlacing patches archive.

Generated on 2026-09-14T09:03:10Z