This repository is a clean-room, portable reimplementation of Apple Macintosh System 7.1, targeting bare-metal x86, ARM (Raspberry Pi), and PowerPC hardware. It is a monolithic kernel that emulates the classic Mac OS Toolbox API, including subsystems such as the Event Manager, Window Manager, Menu Manager, Dialog Manager, QuickDraw, Font Manager, File Manager (HFS), and a Finder-like desktop environment. The codebase is written in C and assembly, with a hardware abstraction layer (HAL) for platform-specific drivers (USB, storage, timers, framebuffer). It boots via GRUB2 (x86) or custom bootloaders (ARM, PPC) and includes built-in applications like SimpleText and MacPaint. The project is explicitly a reverse-engineering effort based on public documentation and ROM analysis, with many subsystems partially implemented or stubbed. It is not production-ready but demonstrates deep knowledge of Mac OS internals and provides a foundation for running classic Mac software on modern hardware.