OpenJazz - RetroBIOS¶


Type	standalone
Classification	Game engines
Source	https://github.com/AlisterT/openjazz
Version	20260301
Profiled	2026-10-04
Systems	jazz-jackrabbit

Technical notes

Open-source reimplementation of Jazz Jackrabbit 1 (Epic MegaGames, 1994). Reads the original DOS game data; no asset bundling in the engine binary.

File lookup walks a path list (platform paths, command-line paths, binary directory, working directory, compiled-in DATAPATH) and opens the first match. ref: src/io/file.cpp:51-77 (File::File), src/main.cpp:186-220

PANEL.000 is the first file opened at startup; the engine aborts with "Unable to find game data files" if that probe fails. The five .0FN fonts follow and abort startup the same way. ref: src/main.cpp:279-295, src/main.cpp:308-333

Level, tileset, sprite and planet names are built by createFileName(): LEVEL<n>.<world>, BLOCKS.<world>, SPRITES.<world>, PLANET.<world>, with a three-digit world extension. The episode menu enables an episode when LEVEL0.<world> exists for its first world (0, 3, 6, 9, 12, 15, then 30, 33, 36 and 50). ref: src/util.cpp:123-193, src/jj1/jj1episodeutils.cpp:19-36, src/menu/gamemenu.cpp:557-566

JJ2 engine support is experimental and gated by ENABLE_JJ2 at build time (off by default); it reads JJ2's .j2l/.j2t files directly (no conversion step). ref: CMakeLists.txt:241-255, src/jj2/level/jj2level.cpp:54-67

28 files | 10 required, 18 optional | 25 in repo, 3 missing Categories: 28 game data

PANEL.000 required in repo game_data

System: jazz-jackrabbit
Source: src/main.cpp:281
Status bar sprites plus two embedded fonts. Fatal if absent.

FONT2.0FN required in repo game_data

System: jazz-jackrabbit
Source: src/main.cpp:312, src/main.cpp:318-333, src/io/gfx/font.cpp:60-64
Startup font. File::File throws when absent and startup aborts.

FONTBIG.0FN required in repo game_data

System: jazz-jackrabbit
Source: src/main.cpp:313, src/main.cpp:318-333

FONTINY.0FN required in repo game_data

System: jazz-jackrabbit
Source: src/main.cpp:314, src/main.cpp:318-333

FONTMN1.0FN required in repo game_data

System: jazz-jackrabbit
Source: src/main.cpp:315, src/main.cpp:318-333

FONTMN2.0FN required in repo game_data

System: jazz-jackrabbit
Source: src/main.cpp:316, src/main.cpp:318-333

STARTUP.0SC required in repo game_data

System: jazz-jackrabbit
Source: src/main.cpp:435-443
Opening cutscene. play() returns the error before the menu when it is absent.

MENU.000 required in repo game_data

System: jazz-jackrabbit
Source: src/menu/mainmenu.cpp:72-82, src/main.cpp:458-466
Main menu graphics. The MainMenu constructor throws when it is absent.

SOUNDS.000 optional in repo game_data

System: jazz-jackrabbit
Source: src/io/sound.cpp:278, src/io/sound.cpp:478-485
Digital sound effects. loadSounds returns false when absent and the engine runs without sfx.

MENUSNG.PSM optional in repo game_data

System: jazz-jackrabbit
Source: src/main.cpp:408, src/io/sound.cpp:337-344
Menu music. playMusic returns silently when the file is absent.

INSTRUCT.0SC optional in repo game_data

System: jazz-jackrabbit
Source: src/menu/mainmenu.cpp:177-187
Instructions screen.

ORDER.0SC optional in repo game_data

System: jazz-jackrabbit
Source: src/menu/mainmenu.cpp:209-217
Order information screen.

MACRO.1 optional in repo game_data

System: jazz-jackrabbit
Source: src/menu/mainmenu.cpp:277-289
Demo recording played when the menu idles. MACRO.1 to MACRO.4 are probed.

END.0SC optional in repo game_data

System: jazz-jackrabbit
Source: src/main.cpp:479-489
Cutscene played when the main menu is left.

FONTS.000 required in repo game_data

System: jazz-jackrabbit
Source: src/io/gfx/font.cpp:288-292, src/jj1/level/jj1levelload.cpp:412-421
Level font. JJ1Level::load returns the error when it is absent.

MAINCHAR.000 required in repo game_data

System: jazz-jackrabbit
Source: src/jj1/level/jj1levelload.cpp:223
Jazz sprite sheet. Required to start any level.

BONUS.000 optional in repo game_data

System: jazz-jackrabbit
Source: src/jj1/bonuslevel/jj1bonuslevel.cpp:53-61, src/jj1/bonuslevel/jj1bonuslevel.cpp:204-206, src/io/gfx/font.cpp:292
Bonus level sprites and the bonus-screen font.

BONUS.0SC optional in repo game_data

System: jazz-jackrabbit
Source: src/jj1/bonuslevel/jj1bonuslevel.cpp:764-766
Cutscene played when a bonus level is won.

LEVEL0.000 optional in repo game_data

System: jazz-jackrabbit
Source: src/menu/gamemenu.cpp:324-325, src/menu/gamemenu.cpp:557-561
First level of world 0, the opener of episode 1.

PLANET.000 optional in repo game_data

System: jazz-jackrabbit
Source: src/jj1/level/jj1levelload.cpp:437-473
World intro planet screen (name + preview). The level loads under the name CUSTOM when it is absent.

BLOCKS.000 optional in repo game_data

System: jazz-jackrabbit
Source: src/jj1/level/jj1levelload.cpp:577-599
World 0 tileset. The extension is the world number unless the level names another one.

SPRITES.000 optional in repo game_data