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> Power Mac G4 Developer Note
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The Power Mac G4 has two external Universal Serial Bus (USB) ports on the back. The USB ports are used for connecting the keyboard and mouse as well as additional I/O devices such as printers, scanners, and low-speed storage devices.
Each USB port is connected to a separate USB root hub, allowing both USB ports to support 12 Mbps devices at the same time with no degradation of their performance. (USB port 2 is shared internally with the USB signals to the ADC monitor.)
For more information about USB on Macintosh computers, please refer to Apple Computer's Mac OS USB DDK API Reference and the other sources listed in USB Interface .