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Nunuhara Cabbage
e00501346b
The 'lint' type in system 4 is NOT a 64-bit integer type. It is actually a signed 32-bit integer type that is clamped between 0 and INT32_MAX. Negative numbers can be assigned to a lint using SH_LOCALASSIGN (or at least, the unofficial compiler emits such code) but LI_* instructions always produce a positive result. I'm guessing System40.exe converts lints to 64-bit integers for doing arithmetic, and then clamps the result to the 32-bit integer range before writing back to a variable. This fixes a bug in Sengoku Rance where units would become invincible in commander battles after their HP fell below zero.
xsystem4
xsystem4 is an implementation of AliceSoft's System 4 game engine for unix-like operating systems.
NOTE: This is a work in progress. Some simple ADV games run more or less okay, but most games are not fully working or have game-breaking bug when run with xsystem4.
Building
First install the dependencies (corresponding Debian package in parentheses):
- chibi-scheme [optional, for debugger]
- meson (meson)
- libffi (libffi-dev)
- SDL2 (libsdl2-dev)
- SDL2_mixer (libsdl2-mixer-dev)
- SDL2_ttf (libsdl2-ttf-dev)
- zlib (zlib1g-dev)
Then build the xsystem4 executable with meson,
mkdir build
meson build
ninja -C build
Running
You can run a game by passing the path to its "System40.ini" to the xsystem4 executable.
build/src/xsystem4 /path/to/System40.ini
For now, xsystem4 needs to be run in the top-level project directory (i.e. the directory that contains this README file). This will change in the future.