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The iMac has two Universal Serial Bus (USB) ports. The USB ports are connected to separate USB root hubs, allowing both USB ports to support 12 Mbps devices at the same time with no degradation of their performance. See "USB Interface".
| Note: The keyboard also contains a USB hub and two more USB ports. See "Keyboard and USB". |
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".