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# The CDG5 project
The CDG5 project is an effort to thoroughly reverse-engineer Mac OS 9.2.2, the final release of the "Classic" Mac OS. We place an emphasis on supporting late-model PowerPC G4-based Macs, and also on hacking new features into the OS (e.g. support for >1.5 GB RAM).
The CDG5 project is a wide-ranging effort to hack on the Classic Mac OS. We are motivated in equal parts by curiosity, nostalgia and a wish to see the OS run well on computers and configurations unsupported by Apple.
Our work is spread over several GitHub repositories:
If you want to contribute, or are just interested, get in touch. Discussion is mainly on the [mailing list](https://lists.ucc.gu.uwa.edu.au/mailman/listinfo/cdg5). Most of our testing takes place on the [MacOS9Lives](http://macos9lives.com) forums.
- Patches to the SuperMario source: <http://github.com/elliotnunn/supermario>
- ~~3 MB 68k ROM: <http://github.com/elliotnunn/mac-rom>~~ (use SuperMario Custer patchset instead)
- 4 MB PowerPC rom, inc. v2 NanoKernel: <http://github.com/elliotnunn/powermac-rom>
- Better reversal of v1 NanoKernel: <http://github.com/elliotnunn/NanoKernel>
- ~~Bootable "Mac OS ROM" file: <http://github.com/elliotnunn/newworld-rom>~~ (use tbxi instead)
Reverse engineered source code:
- Patches to the widely distributed "SuperMario" source to compile a System file (7.1) or Mac OS ROM file (~OS 9.2.2): <http://github.com/elliotnunn/supermario>
- Thorough reversal of Gary Davidian's Power Macintosh NanoKernel: <http://github.com/elliotnunn/NanoKernel>
- Less-thorough reversal of René Vega's Multitasking NanoKernel: <http://github.com/elliotnunn/powermac-rom>
- Disk-based Start Manager: <http://github.com/elliotnunn/boot3>
- Bootloader-NanoKernel shim: <http://github.com/elliotnunn/wedge>
Some tools:
- Get data into and out of [HFS disk images](https://pypi.org/project/machfs) and [resource forks](https://pypi.org/project/macresources), robustly and portably
- Dump, patch and rebuild Mac OS ROM files: <http://github.com/elliotnunn/tbxi>, <http://github.com/elliotnunn/tbxi-patches>
- Get data into and out of [HFS disk images](https://pypi.org/project/machfs) and [resource forks](https://pypi.org/project/macresources), robustly and portably
- Build software in the Mac emulator of your choice: http://github.com/elliotnunn/BuildCubeE
- Move resources around: <http://github.com/elliotnunn/zcp>
- Patch PowerPC binaries: <http://github.com/elliotnunn/patchpef>
- Patch 68k MPW code objects: <http://github.com/elliotnunn/patchobj>
- Extract 68k MPW code objects from a ROM: <https://github.com/elliotnunn/unlink>
- ~~Graft a System Enabler onto a Mac OS ROM file: <https://github.com/elliotnunn/enablifier>~~ (use tbxi instead)
- Extract 68k MPW code objects from a ROM (used for the Mac OS ROM build above): <https://github.com/elliotnunn/unlink>
- Use my personal collection of hacky tools: <https://github.com/elliotnunn/ToolboxToolbox>
Most of our testing takes place on the [MacOS9Lives](http://macos9lives.com) forums. Technical discussion is mainly on the [mailing list](https://lists.ucc.gu.uwa.edu.au/mailman/listinfo/cdg5).