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Install OS X Leopard on some unsupported Macs.

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LeopardAssist assists in the process of install OS X Leopard on machines that did not meet the minimum system requirement of an 867MHz or faster processor. It achieves this by temporarily writing a script into the NVRAM of your G4-based Mac. Executed at startup, this script will temporarily force the system to report that a faster processor is installed, allowing the Leopard installer to successfully complete its minimum system requirements check.

This allows Leopard to be installed from unmodified installation media or another bootable device. LeopardAssist handles the interaction with Open Firmware, specifying the target processor speed, the number of physical processors in the system, the desired boot device and any additional startup flags to simplify the installation and configuration process.

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  • Allows OS X Leopard to be installed on G4-based Macs with less than 867MHz processors
  • Temporarily changes reported CPU speed of G4-based Macintosh computers
  • Simplifies the setup process on unsupported machines, handling boot devices and startup options


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Additional Project Details



Intended Audience

End Users/Desktop

User Interface

Cocoa (MacOS X)

Programming Language



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