ac97 man page on OpenBSD

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AC97(4)			  OpenBSD Programmer's Manual		       AC97(4)

     ac97 - generic AC'97 codec driver

     AC'97 codecs contain the analog to digital (A/D), digital to analog
     (D/A), and mixing circuitry of many modern sound cards.  AC'97 codecs,
     for the most part, do not talk to host buses like the PCI bus directly.
     Instead, they communicate through an interface chip, called the host
     controller.  The Ensoniq AudioPCI 97 (see eap(4)) is an example of such a
     host controller.

     Unlike many drivers, the ac97 driver does not appear in the configuration
     file.  Instead, the driver is automatically attached by the drivers that
     require it.

     auacer(4), auich(4), auixp(4), autri(4), auvia(4), clcs(4), clct(4),
     eap(4), emu(4), esa(4), fms(4), maestro(4), neo(4), yds(4)

     The ac97 driver does not keep track of the current user settings and
     instead relies on the hardware to do this.

     The ac97 driver could do more to detect mixer channels that don't work
     and cull them from the list.

OpenBSD 4.9		       February 26, 2010		   OpenBSD 4.9

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