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NetBSD 6.1.5 - man page for ac97 (netbsd section 4)

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AC97(4) 			   BSD Kernel Interfaces Manual 			  AC97(4)

     ac97 -- generic AC97 codec driver

     AC97 codecs contain the analog-to-digital (A/D), digital-to-analog (D/A), and mixing cir-
     cuitry of many modern sound cards.  AC97 codecs, for the most part, do not talk to host
     busses 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), emuxki(4),
     esa(4), esm(4), fms(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.

BSD					 October 7, 1999				      BSD
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