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PATH Hardware Documentation
> USB Devices
> Mac OS USB DDK API Reference
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Version 1.1 provides improved bus enumeration at startup to support proper USB driver loading before other system extensions are initialized. This is accomplished by providing task time for the USB expert loader to process all hub communications. When all hubs have reported that they have discovered their devices, and the USB system software has completed the search for USB class drivers, then the remainder of the booting process, loading extensions and launching the finder, continues.
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