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Version 1.1 contains support for isochronous transfers. You can test for the presence of isochronous support by checking the gestalt selector gestaltUSBAttr ( `usb ` ). If gestaltUSBHasIsoch (bit 1 = 0x02) is set, then isochronous support is available in the form of two new calls:
OSStatus USBIsocWrite(USBPB *pb);
OSStatus USBIsocRead(USBPB *pb);
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