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M33 (March33) brings the PPSSPP PSP emulator to jailbroken PS4 consoles as an app you launch from the home screen like any other. Pick a game, press Cross, and play with a DualShock 4. Pressing L3 + R3 during a game opens a quick menu made for the controller: save states with their pictures, cheats, rewind, the picture and sound settings, restart or quit.

With the PSP's own firmware installed (M33 downloads it from Sony for you), the real XMB starts your games the way a PSP does, with its own game boot animation.

Under the hood, PPSSPP's JIT turns the PSP's MIPS code into x86-64 code for the PS4's CPU, and rendering goes through Vulkan: Mesa's RADV driver, adapted to submit work directly to the PS4's AMD GPU.

You bring your own game backups. Nothing copyrighted is bundled: no games, no firmware.

A PSP, as it was

• The XMB: with PSP firmware 6.61 installed, M33 can start straight into the PSP's own menu. Every disc game in your folder shows up in its Game column. Hold L1 while M33 opens to skip it.
• The game boot: games started from the XMB play the firmware's real startup and game boot animation. For games started from M33's own list too, turn on Settings → System → PSP Firmware → Play the PSP game boot when a game starts (off by default).
• One button to get the firmware: Settings → System → PSP Firmware → Download PSP firmware 6.61 from Sony fetches Sony's own updater and installs it.

A quick menu made for the couch (L3 + R3)

• The paused game behind a panel that slides in, rows with icons, values changed with Left / Right.
• Save State / Load State by slot, with the slot's picture, date and time beside the menu.
• Cheats: turn each one on or off. The game's codes come from PPSSPP's CWCheat database, downloaded the first time.
• Rewind, Frame Generation, Resolution, Game Volume and the FPS Counter, applied at once. Settings opens all of PPSSPP's settings; Display & Effects its picture options.

Rewind, the way RetroArch does it

• Hold L2 and the game plays backwards; let go and it carries on from there. Hold again to go further back. On or off per game.

A sharp picture

• Rendered at 4x (1920x1088, the TV's 1080p) with AMD FidelityFX's sharpening (FSR RCAS).
• Frame Generation (experimental, off by default): a game running at 30 is shown at 60, with a frame made between every two. Works best in games with a steady 30 fps.

Everything else you'd expect

• RetroAchievements, online.
• The PS4's own keyboard for text, with Cross to confirm.
• Every language PPSSPP has, in their own script: Japanese, Chinese, Korean, Russian, Arabic, Persian, Hebrew, Thai, Khmer, Lao and the rest. M33's own menus in 13 of them.
• A 3D animated startup and M33's own theme, icon and menu sounds.

You need: a jailbroken PS4 with GoldHEN, an FTP connection to it, and dumps of PSP games you own.

1. Grab the latest M33-vX.XX.pkg from the releases page and install it with GoldHEN's Package Installer.
2. Start M33 once: it creates /data/March33/.
3. Put your games in /data/March33/games/ (.iso, .cso, .chd). Homebrew and PSN games (EBOOT.PBP in their own folder) go in /data/March33/PSP/GAME/.
4. (Optional, for the XMB and the game boot) Settings → System → PSP Firmware → Download PSP firmware 6.61 from Sony. If your console can't reach Sony's server, copy Sony's 6.61 update (EBOOT.PBP) to /data/March33/firmware/PSP661_EBOOT.PBP and press it again.

Updating M33: install the newer package on top of the old one. Everything you've set up lives in /data/March33/ and survives updates. The version is in the corner of the opening animation.

M33 keeps all of PPSSPP's settings (quick menu → Settings), with these defaults for the PS4:

Everything the app creates sits in /data/March33/:

• games/: your disc games
• PSP/: the PSP memory stick: SAVEDATA (your saves), PPSSPP_STATE (save states and their pictures), GAME (homebrew), Cheats (cheat files and the database), SYSTEM (settings)
• PSP/NAND/: the installed PSP firmware
• firmware/: the firmware updater, once downloaded
• ppsspp.log, boot-trace.log, crash.log, hang.log: logs for bug reports

Status	Meaning
	Runs well enough to play through
	Starts and plays; not measured yet
	Gets into the game, but slowdowns, glitches or freezes get in the way
	Doesn't start, or closes right away

Tested by us on a launch-model PS4:

Status	Game	Notes
	Grand Theft Auto: Liberty City Stories	30 fps (its normal rate), full speed. Some hitches in busy scenes. Its 60 FPS cheat is too heavy for the PS4: the game runs in slow motion.
	God of War: Ghost of Sparta
	God of War: Chains of Olympus
	LittleBigPlanet
	SSX on Tour

PPSSPP itself runs most of the PSP library: see its compatibility list. Tested a game? Tell us on Discord or open an issue with the game, its region, and how it ran.

Why does a game stutter in busy scenes? The PS4's CPU is usually the limit. Turn Rewind off for that game (quick menu), and on a PS4 Pro turn on Boost Mode in the PS4's settings. A game's first minutes can also hitch while its shaders are compiled; they're kept for next time.

Can games run at 60 fps? Most PSP games run at 30. Their 60 FPS cheats make the game itself run twice as fast, which the PS4 usually can't keep up with. Try Frame Generation instead: the game keeps its speed and you see 60.

Where are my saves? In /data/March33/PSP/SAVEDATA, as on a PSP's memory stick: you can copy them to and from a real PSP or PPSSPP on another device.

The firmware download fails. Jailbroken consoles often block Sony's servers. M33 then asks public DNS servers itself; if it still can't get through, copy the updater over FTP as in Getting started.

How do I report a bug? On Discord or in an issue. Attach ppsspp.log, boot-trace.log and, if there is one, crash.log or hang.log from /data/March33/, and mention the game, its region, the M33 version, your PS4 model and firmware.

Join the M33 Discord for help, game reports and news.

How the port works (the Vulkan window system on VideoOut, the memory arena, the JIT, the XMB and the firmware game boot) and how to build it: docs/TECHNICAL.md.

• PPSSPP: the emulator itself, by Henrik Rydgård and everyone who has contributed to it
• Mesa: the RADV Vulkan driver that draws every frame
• OpenOrbis and PacBrew: the PS4 toolchains
• love-ps4: the reference PS4 setup
• FFmpeg: video and audio
• FreeType, HarfBuzz and the Noto fonts (SIL Open Font License, assets/fonts/OFL-Noto.txt): text in every language
• CWCheat Database Plus: the cheat codes
• RCOMage: how the PSP firmware's resources are laid out
• RetroAchievements: achievements
• Resonance, Dolphin for PS4 and Crema: the PS4 groundwork M33 is built on

Released under the GNU General Public License 2.0 or later, the same licence as PPSSPP. See LICENSE.

This is a fan-made project with no ties to Sony Interactive Entertainment or the PPSSPP project. PSP, PlayStation and PS4 are trademarks of Sony Interactive Entertainment. Please only play games you own. This project won't help you find or share game or firmware files.