Advanced Mac Substitute is an API-level reimplementation of 1980s-era Mac OS that runs 68K Macintosh applications in an emulator without requiring an Apple ROM or system software. Unlike traditional emulators that replicate hardware, it replaces the OS entirely, launching directly into applications. The project is structured with a backend 68K emulator that runs on any POSIX-like system and a frontend using SDL2, with custom implementations for macOS, X11, and Linux framebuffer. It can run several original Mac applications including games from 1984. Source code is available on GitHub.
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