On this page you can download the compiled Java class files for JavaBoy, as well as the source code. The source code is only needed if you intend to recompile the emulator.
A couple of the unique uses for JavaBoy include:
JavaBoy is a complete emulator, with good compatibility, accurate sound, and Game Link support via TCP/IP, allowing two-player games to be played over the Internet or on a LAN. It also supports emulation of the Game Boy Printer.
JavaBoy also contains a full debugger to assist in the creation of new Gameboy games, which supports memory dumps, breakpoints, altering of ROM mapping, and many more features.
JavaBoy has been release as Open Source software under the GNU General Public Licence. This means that you can download the source code, find out how it works, and then make your own modifications and improvements, contributing to the free software movement!
If you have any comments, bug reports, or you would like to use JavaBoy on your own website, please mail me: neil at millstone dot demon dot co dot uk.
Background graphics taken from The Legend of Zelda, Earthworm Jim, Gremlins 2, Tetris, Bubble Bobble, Super Marioland, Gradius 2, Bubble Ghost, Megaman, Super Marioland 3, Burger Time, Donkey Kong, Aladdin, Street Fighter 2, Spiderman.
- Providing demos of commercial games which customers can play on the web in their web browser, with no downloads required.
- Playing Gameboy games on a platform which doesn't have a native Gameboy emulator.
JavaBoy is a complete emulator, with good compatibility, accurate sound, and Game Link support via TCP/IP, allowing two-player games to be played over the Internet or on a LAN. It also supports emulation of the Game Boy Printer.
JavaBoy also contains a full debugger to assist in the creation of new Gameboy games, which supports memory dumps, breakpoints, altering of ROM mapping, and many more features.
JavaBoy has been release as Open Source software under the GNU General Public Licence. This means that you can download the source code, find out how it works, and then make your own modifications and improvements, contributing to the free software movement!
If you have any comments, bug reports, or you would like to use JavaBoy on your own website, please mail me: neil at millstone dot demon dot co dot uk.
Background graphics taken from The Legend of Zelda, Earthworm Jim, Gremlins 2, Tetris, Bubble Bobble, Super Marioland, Gradius 2, Bubble Ghost, Megaman, Super Marioland 3, Burger Time, Donkey Kong, Aladdin, Street Fighter 2, Spiderman.
Please note that a Java runtime environment is needed to run JavaBoy as an application, which is the preferred method. Links are provided here to the IBM Java Runtime Environment, which is recommended for good performance, although it is rather a hefty download. Make sure to download both files.
Sun's Java Runtime Environment can also be used, which comes in at a more reasonable 8Mb.
| Title | Size | Release date |
| JavaBoy version 0.92 | 85Kb | 18/06/05 |
| JavaBoy version 0.92 source code | 78Kb | 18/06/05 |
| JavaBoy version 0.91 | 79Kb | 08/05/05 |
| JavaBoy version 0.91 source code | 71Kb | 08/05/05 |
| JavaBoy version 0.9 | 70Kb | 25/03/05 |
| JavaBoy version 0.9 source code | 64Kb | 25/03/05 |
| JavaBoy version 0.81 | 65Kb | 12/07/01 |
| JavaBoy version 0.81 source code | 60Kb | 12/07/01 |
| Sun Java Runtime Environment 1.5 | ~8.0Mb | - |
Emulation Changes
- Fixed LCDC interrupt LCY flag. Fixes crash in 'Max', 'Rayman GBC', 'Donkey Kong Country'.
- Fixed problem when grabbing the next instruction when executing right next to the end of memory. Fixes crahes on 'G&W Gallery 3', 'Millipede/Centipede' and others
- Fixed P10-P13 interrupt handling. Fixes controls in Double Dragon 3 menus, Lawnmower Man, and others.
- Added hack to unscramble status bars on many games (Aladdin, Pokemon Pinball) that change bank address just before the window starts
- Changed sprite hiding behaviour. Now sprites are turned on if they're visible anywhere in the frame. (Elevator Action, Mortal Kombat 4)
- Fixed debug breakpoint detection (Micro Machines 2, Monster Race 2, others)
- Changed VBlank line to fix white screen on startup (Home Alone, Dragon Tales)
- Added extra condition to LCD interrupts - that the display should be enabled.
- Fixed comparison with LCY register, Austin Powers Oh Behave! now works, and GTA status bar isn't scrambled.
- Fixed BG enable on GBC. Dragon Ball Z now works.
- Added support for MBC3 mapper chip. MBC3 games now work (Pokemon Blue/Crystal/Gold/Silver, Harvest Moon)
- Added emulation of the Game Boy Printer (only in application mode for now)
- Fixed online save RAM bugs
- Switch menu from click to double-click to avoid problem with setting focus
- Added Save to Web feature
- Added reset option to menu
- Fixed bad update to border when applet window covered (only on microsoft VM)
- Fixed printing of HDMA data to console slowing down games
- Fixed ROMS with save RAM not loading when on a web page
- Applets can be sized other than 1x
- Applets show strip showing current ROM and other info displayed at start
- Applets have options menu providing control change, size change, frameskip change, sound toggle
- Applets have a parameter to turn sound on/off in the applet tag
- Half-fixed keyboard controls sometimes not starting in application version
- Fixed random keypressed causing an exception when no ROM loaded
- ROMS can optionally be loaded from ZIP/JAR and GZip compressed files (code contributed by Stealth Software)
- Much more accurate emulation of sound channel 4 (noise)
- Flipped double height sprites are now handled properly
- Corrected bug in LCDC register for hiding sprites
- Fixed tile cache memory bug
Background graphics taken from The Legend of Zelda, Earthworm Jim, Gremlins 2, Tetris, Bubble Bobble, Super Marioland, Gradius 2, Bubble Ghost, Megaman, Super Marioland 3, Burger Time, Donkey Kong, Aladdin, Street Fighter 2, Spiderman.
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