System Software
The system software that comes with the Power Mac G4 computer is Mac OS 9 with extensions and control panels required for product-specific features. Features specific to the Power Mac G4 computer are described in
Mac OS ROM Image File. For a general description of the Mac OS 9 release, refer to the Technote for Mac OS 9. The technote is available on the Technote website at
http://developer.apple.com/technotes/
Booting From External Drives
The Power Mac G4 computer can boot from a USB storage device that follows the USB Mass Storage Class specification.
Class drivers are software components that are able to communicate with many USB devices of a particular kind. If the appropriate class driver is present, any number of compliant devices can be plugged in and start working immediately without the need to install additional software. The Mac OS for the Power Mac G4 computer includes USB Mass Storage Support 2.0, a class driver that supports devices that meet the USB Mass Storage Class specification.