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RetroBIOS

LRPS2

LRPS2 needs one Sony PlayStation 2 BIOS file, any region.

  1. Get one from the Sony PlayStation 2 files.
  2. Put it in pcsx2/bios/, inside your BIOS folder.

Any file name works. The emulator reads what the file holds.

About this profile
Detail Value
Type libretro
Classification Community fork
Source https://github.com/libretro/parallel-ps2
Upstream https://github.com/PCSX2/pcsx2
Version v2.0.0, stated in libretro/main.cpp
Revision libretro/parallel-ps2@8c2b679622d6, PCSX2/pcsx2@f0523f8acb1d
Profiled 2026-10-21
Profile YAML, JSON
Cores lrps2, pcsx2, ps2
Systems Sony PlayStation 2
BIOS directory pcsx2/bios/
Resources directory pcsx2/resources/
Install this emulator's files

The installer finds your setup and its BIOS folder, then downloads only the files this emulator reads there and checks each one.

Open the Start menu. Type PowerShell and open it. Paste the line. Press Enter.

PowerShell
&([scriptblock]::Create((irm https://abdess.github.io/retrobios/i.ps1))) --emulator lrps2
Technical notes

pcsx2/resources/GameIndex.yaml, the per-game patch, settings override and compatibility database, is the one the buildbot publishes in LRPS2.zip (the lrps2 data directory). An OSD warning is shown if it is missing, and some games do not boot without it. Hard fork of PCSX2 (pre-Qt, 1.7-dev era) ported to libretro. x86_64 only. BIOS detection is filename-agnostic: scans pcsx2/bios/ for any file between 4-8 MB with a valid romdir structure (RESET + ROMVER entries). No hash validation. Companion files (.rom1, .rom2, .nvm, .mec) derive paths from the selected BIOS. DEV9 (network/HDD) and USB are stubbed in the libretro port. Widescreen patches are largely compiled into the core (libretro/patches.cpp). .info firmware_count=2 counts the bios folder and GameIndex.yaml. .info description mentions EROM.BIN but no EROM loading path exists in the code.

Files

Section titled “Files”

7 files: 1 required, 6 optional. 2 have an HLE fallback.

In this collection: 2 in repo and 5 missing.

Required

Section titled “Required”
FileStatus

a Sony PlayStation 2 BIOS, any file name

PS2 BIOS binary

  • Path: pcsx2/bios/<bios>.bin
  • Scans pcsx2/bios/ for any file between 4 MB and 8 MB. Validates via romdir structure parsing (RESET + ROMVER entries). User selects BIOS via core option pcsx2_bios. Falls back to first valid BIOS found if configured BIOS is missing.
  • Size: min 4.0 MB, max 8.0 MB
Validation and source
missing

Optional

Section titled “Optional”
FileStatus

<bios>.rom1

DVD player ROM

  • Path: pcsx2/bios/<bios>.rom1
  • DVD player ROM. Tries <biospath>.rom1 (appended) then <biosbase>.rom1 (extension replaced). Silently skipped if not found.
  • Size: max 4.0 MB
Source
missing

<bios>.rom2

Chinese ROM extension

  • Path: pcsx2/bios/<bios>.rom2
  • Chinese region ROM extension. Same naming convention as rom1. Only present on Chinese region consoles.
  • Size: max 512.0 KB
Source
missing

<bios>.nvm

NVRAM / EEPROM data

  • Path: pcsx2/bios/<bios>.nvm
  • Console EEPROM data (language, timezone, region, iLink ID, OSD settings). Path derived from BIOS path with extension replaced to .nvm. Auto-created with region-appropriate defaults if missing or invalid.
  • Size: 1.0 KB
Source
missing HLE fallback

<bios>.mec

Mechacon version

  • Path: pcsx2/bios/<bios>.mec
  • Mechacon (disc drive controller) version as u32. Auto-created with default 0x00020603 if missing.
  • Size: 4 B
Source
missing HLE fallback

cheats_ws.zip

widescreen patches archive

  • Path: pcsx2/resources/cheats_ws.zip
  • ZIP archive of per-game widescreen (16:9) patches in pnach format. Only loaded when widescreen patches are enabled via core options. Fallback if no patches found in pcsx2/cheats_ws/ folder.
Source
in repo

cheats_ni.zip

no-interlacing patches archive

  • Path: pcsx2/resources/cheats_ni.zip
  • ZIP archive of per-game no-interlacing patches in pnach format. Only loaded when no-interlacing patches are enabled via core options. Fallback if no patches found in pcsx2/cheats_ni/ folder.
Source
in repo

Data directories

Section titled “Data directories”

Next steps

Section titled “Next steps”
.

Maintained by Abdess on GitHub. Report a problem.

Packs from release v2026.10.10, .

MIT for the tooling and metadata. BIOS and firmware files are third-party system software, preserved for personal backup, archival and interoperability.