Re: High Speed Isochronous support

Subject: Re: High Speed Isochronous support

From: Michael Krugman <email@hidden>

Date: Tue, 6 Sep 2005 13:08:49 -0500

Delivered-to: email@hidden

I have done, and had done, quite a bit of USB development under OS X. I haven't done a lot with isoch, but it is supported and there are many people on the list that work with it. All of the vendors of the devices I developed for had to be proven wrong...they think Windoze is all that exists, which is NOT the case. I've had quite a few of them eating their words when we were finished. None of their shipping products have a Mac driver, because none of them took the time, or expense, to develop it. The world still thinks of Mac as the "old Mac", with hard to operate systems, antiquated OS, and no apps...one of these days they will wake up and realize that Mac IS where it's at. Sorry I couldn't help much with isoch, but hang in there...and make that vendor eat his words!

Mike

On Sep 6, 2005, at 1:02 PM, Thane Heninger wrote:

I am new to isochronous transactions since I recently changed jobs. We are interested in developing an audio product that would require the bandwidth available only in USB 2.0 high speed.

Several individuals here believe that Mac OS X does not support isochronous on USB 2.0. Looking through the mailing list archives and documentation, it appears that it is supported, though there may have been some bugs in the recent past as in the message from Rhoads on 2/28/05 (http://lists.apple.com/archives/usb/2005/Feb/msg00161.html) which I suppose has been fixed since February.

One vendor told us:
And, again, USB2.0 means NO drivers for Mac OS X. Currently, to our knowledge, OS X does not support any type of isochronouns streaming over USB2.0. So any USB2.0 solution would be Windows XP only.
Be aware tha none of the shipping USB2.0 products have a Mac driver (e.g. the Edirol boxes)

Which led everyone to believe that it is simply not supported. But based on the conversation on this mailing list, I think that is false.

Can you confirm that it is indeed supported? Do you have any suggestions for why the vendor would feel that it is not supported?

Thank you,
Thane Heninger
Harman Music Group
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References:

>High Speed Isochronous support (From: Thane Heninger <email@hidden>)