NAME    [Toc]    [Back]

     ac97 - generic AC97 codec driver

DESCRIPTION    [Toc]    [Back]

     AC97 codecs contain the analog-to-digital (A/D), digital-toanalog (D/A),
     and  mixing  circuitry  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.

SEE ALSO    [Toc]    [Back]

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

BUGS    [Toc]    [Back]

     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     3.6                         October      7,      1999