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PATH Hardware Documentation
> USB Devices
> Mac OS USB DDK API Reference
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A general discussion of the features in version 1.1 of the Mac OS USB software is provided in this appendix. It also lists and defines the use of the version 1.1 parameter block that supports isochronous transfers.
There are significant differences in the features supported in version 1.1 of the Mac OS USB software. To take advantage of the new features some modification of existing code is required. For information about the required code changes to support version 1.1, see Code Changes Required To Support The Version 1.1 USBPB .
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