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toy-os

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A from-scratch x86_64 OS that boots in QEMU and runs Freedoom. Ring-0 kernel, ring-3 userspace with custom libc and shell, FAT16, SB16 audio, syscall ABI, ELF loader. Builds on macOS, Linux, WSL2, and native Windows (MSYS2). Made with GitHub Copilot CLI.

  • Updated May 22, 2026
  • C

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