Um Jammer Lammy v0.1.0 — Initial Release

Initial preview of Um Jammer Lammy Recompiled for Windows x64 and Linux x64.

• Rhythm Timing Assist: adjustable early/late tolerance and latency compensation for modern displays, controllers and audio. Enable it in Mods; it starts disabled. For maximum forgiveness, set early and late tolerance to 60 ms and start with compensation at 0 ms. Correct buttons and musical patterns still matter.
• 1080p internal-resolution preset by default, with adaptive gameplay widescreen and optional fixed 16:9 / 21:9 / original 4:3. Movies and 2D menus keep their proportions.
• Fast Resource Loading enabled by default: a private cache built from your disc feeds a game-specific HLE adapter. The measured initial menu resource load dropped from about 4.2 seconds to 0.2 seconds, excluding first-run cache preparation. Music and movie streams retain their original timing.
• Recomp launcher, controller/keyboard settings, US boxart and real gameplay screenshots.

Extract the entire ZIP, then run Um_Jammer_Lammy_Recompiled.exe on Windows or ./Um_Jammer_Lammy_Recompiled on Linux (Ubuntu 24.04 or compatible). The Linux package includes SDL3. Supply your own US SCUS-94448 cue/bin disc image; no game disc or retail BIOS is included. Bundled OpenBIOS is available.

Windows controller gameplay received an initial owner playtest. Both release packages receive launcher and boot checks, and focused tests cover the timing and resident-loader contracts. This is an initial preview, without exhaustive checks of all stages, duets or PaRappa mode. Linux controller gameplay awaits community validation.

See the player README and screenshots and supported disc details. SHA256SUMS.txt contains download checksums.