This is a multi-platform port of xsystem35, a free implementation of AliceSoft's System 3.x game engine.

See the game compatibility table for a list of games that can be played with xsystem35-sdl2.

In addition to the original System 3.x functionalities, xsystem35-sdl2 offers the following features:

Many System 3.x games feature music as audio tracks on the CD-ROM. xsystem35 can play music from audio files, eliminating the need to insert CDs. To use ripped audio files, create a file named playlist.txt in the game directory and list the paths to your tracks, one per line. For example:

# The first line is not used
BGM/track02.mp3
BGM/track03.mp3
...

The first line is not used because the first track on a game CD is typically a data track.

Some games have integrated music as MIDI. In such cases, the music won't play using the virtual CD feature. If you encounter a Cannot load MIDI error message, you might need to set the SDL_SOUNDFONTS environment variable to point to an .sf2 file. For example:

SDL_SOUNDFONTS=/usr/share/soundfonts/GeneralUser.sf2 xsystem35

While the original System 3.x only supported Shift_JIS (a Japanese character encoding), xsystem35 supports Unicode and can run games translated into languages other than Japanese and English.

For instructions on how to build a game with Unicode support, see the xsys35c documentation.

xsystem35 features a built-in debugger that allows you to step through the game and examine or modify game variables. There are two ways to use the debugger:

• Through Visual Studio Code (recommended): The vscode-system3x extension provides a graphical debugging interface for System 3.x.
• Using the CLI Debugger: Running xsystem35 with the -debug option will launch the debugger with a console interface. Type help to see a list of available commands.

Prebuilt packages for Windows and Android can be downloaded from the Releases page.

Note for Windows:

• The 64-bit version supports Windows 10 or later. For older versions of Windows, please use the 32-bit version.
• Debugging is supported only in the 64-bit version.

For other platforms, refer to the Building section.

Copy xsystem35.exe to the game folder and run it.

See android/README.md.

Run xsystem35 from within the game directory.

$ cd /path/to/game_directory
$ xsystem35

See xsystem35 command manual for detailed usage.

$ sudo apt install build-essential cmake libgtk-3-dev libsdl2-dev libsdl2-ttf-dev libsdl2-mixer-dev libwebp-dev libportmidi-dev libcjson-dev asciidoctor
$ mkdir -p out/debug
$ cd out/debug
$ cmake -DCMAKE_BUILD_TYPE=Debug ../../
$ make && make install

Homebrew is required.

$ brew install cmake pkg-config sdl2 sdl2_mixer sdl2_ttf webp portmidi cjson asciidoctor
$ mkdir -p out/debug
$ cd out/debug
$ cmake -DCMAKE_BUILD_TYPE=Debug ../../
$ make && make install

MSYS2 is required.

$ pacman -S cmake mingw-w64-ucrt-x86_64-gcc mingw-w64-ucrt-x86_64-cmake mingw-w64-ucrt-x86_64-SDL2 mingw-w64-ucrt-x86_64-SDL2_ttf mingw-w64-ucrt-x86_64-SDL2_mixer mingw-w64-ucrt-x86_64-libwebp mingw-w64-ucrt-x86_64-portmidi mingw-w64-ucrt-x86_64-cjson
$ mkdir -p out/debug
$ cd out/debug
$ cmake -G"MSYS Makefiles" -DCMAKE_BUILD_TYPE=Debug ../../
$ make

$ mkdir -p out/wasm
$ cd out/wasm
$ emcmake cmake -DCMAKE_BUILD_TYPE=MinSizeRel ../../
$ make

To use the generated binary, check out Kichikuou on Web and copy out/xsystem35.* into its docs directory.

See android/README.md.