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From: Bankim Bhavsar <bankim.bhavsar@gmail.com>
Date: Sat,  4 Sep 2010 10:09:38 -0700
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To: Fans of the OS Plan 9 from Bell Labs <9fans@9fans.net>
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>> Though Immediate Command/Response Interface should work, CORB/RIRB is
>> the recommended way to send/receive commands/responses from the codec.

> Reading the datasheet of the codec, I havn't found any mention of CORB or
> RIRB, so I would hazard a guess that that's not what I want. But still,
> what is CORB/RIRB?

Sorry for the confusion. I think you are referring to a different audio card.

For the Intel High-Definition Audio Controller
(http://www.intel.com/standards/hdaudio/pdf/HDAudio_01.pdf)

CORB = Command Output Ring Buffer
RIRB = Response Input Ring Buffer

This is the mechanism used by HDAudio Controller to communicate with
the codec attached.

-Bankim.