Um Jammer Lammy Recompiled

An unofficial, noncommercial PSXRecomp compatibility project for Um Jammer Lammy (Europe, SCES-01753), also called UmJamLamRecomp.

Download the Windows playtest setup kit

Releases are owned-input setup kits: you supply your legally obtained disc and generate the playable executable locally. No disc data, extracted game executable, generated game code, retail PlayStation BIOS, saves, captures, or analysis databases are included. OpenBIOS is included and used by default.

Supported target

• Windows 10 or 11, x86-64, Intel or AMD processor
• Um Jammer Lammy (Europe), SCES-01753
• Matching Redump-style CUE/BIN disc dump
• Keyboard or SDL3-compatible controller

Using the setup kit

1. Download the ZIP from Releases.
2. Extract the entire ZIP to a writable folder outside Program Files.
3. Run UmJammerLammy_Recompiled.exe.
4. Select your legally obtained European CUE file and choose Generate & rebuild.
5. Reopen the same executable after the build finishes.

The setup wizard can download its supported CMake, Ninja, and Clang toolchain. Keep the extracted kit together and connect your controller before launch. The Windows binaries are currently unsigned, so Windows may show a SmartScreen warning.

Optional enhancements

• 16:9 3D View reveals extra scenery in gameplay and real-time 3D scenes. Movies and flat menus remain 4:3. The option is disabled by default; OpenGL is recommended.
• CRT Display provides JVC and Sony Trinitron-inspired presets.
• Clean Audio Transitions fades the frozen retry-screen reverb tail. It is enabled by default and can be disabled for original PlayStation behavior.

Controllers

Player 1 selects a connected controller automatically. The emulated controller is locked to digital mode, with hybrid mode disabled. Bindings remain configurable.

Controller family	Support
Nintendo Switch	SDL3 gamepad support
Nintendo Switch 2-compatible	PowerA Advantage Wired Controller (20D6:A720) tested over USB
PlayStation 4 / DualShock 4	SDL3 gamepad support
PlayStation 5 / DualSense	SDL3 gamepad support
Xbox	SDL3 gamepad support

Controls

PlayStation input	Keyboard	Switch / Switch 2	PS4 / PS5	Xbox
D-pad	WASD	D-pad / left stick	D-pad / left stick	D-pad / left stick
Cross / Circle	J / K	B / A	Cross / Circle	A / B
Square / Triangle	U / I	Y / X	Square / Triangle	X / Y
L1 / R1	Q / E	L / R	L1 / R1	LB / RB
L2 / R2	Z / C	ZL / ZR	L2 / R2	LT / RT
Start / Select	Enter / Right Shift	Plus / Minus	Options / Share or Create	Menu / View

If a controller does not respond, check the Player 1 device selection and make sure only one game instance is running.

Building from the repository

The title source expects a compatible psxrecomp checkout beside this repository. The release kit already contains the matching prepared SDK and is the recommended way to playtest. Local development build commands are documented in docs/setup-host-build-recipes.md.

Never commit or redistribute disc data, generated game code, retail BIOS files, memory cards, saves, captures, logs, or Ghidra projects.

Status and reporting

Local verification covers disc validation, OpenBIOS boot, language and menu flow, Stage 1 gameplay, keyboard and the attached PowerA controller, native 16:9, CRT presentation, and the retry-screen audio cleanup. This is not a full-game completion claim. macOS and Linux packages still require native-host verification.

Report a problem with the release version, renderer, resolution scale, enabled mods, controller model, and reproduction steps. Do not attach copyrighted game data or local captures.

Licensing and trademarks

Project-owned code is available under the MIT License. Framework and third-party components retain their own licenses. Names and trademarks identify compatibility only. This project is not affiliated with or endorsed by Sony Interactive Entertainment or the original developers and publishers.