1.\" $OpenBSD: ac97.4,v 1.8 2001/01/12 17:14:12 deraadt Exp $ 2.\" 3.Dd October 7, 1999 4.Dt AC97 4 5.Os 6.Sh NAME 7.Nm ac97 8.Nd generic AC-97 codec driver 9.Sh DESCRIPTION 10AC-97 codecs contain the analog-to-digital (A/D), digital-to-analog 11(D/A), and mixing circuitry of many modern sound cards. 12AC-97 codecs, for the most part, do not talk to host busses like the PCI bus 13directly. 14Instead, they communicate through an interface chip, called 15the host controller. 16The Ensoniq AudioPCI 97 (see 17.Xr eap 4 ) 18is an example of such a host controller. 19.Pp 20Unlike many drivers, the 21.Nm 22driver does not appear in the configuration file. 23Instead, the driver is automatically attached by the drivers that require it. 24.Sh SEE ALSO 25.Xr auich 4 , 26.Xr auvia 4 , 27.Xr clcs 4 , 28.Xr eap 4 , 29.Xr fms 4 , 30.Xr neo 4 . 31.Sh BUGS 32The 33.Nm 34driver does not keep track of the current user settings and instead 35relies on the hardware to do this. 36.Pp 37The 38.Nm 39driver could do more to detect mixer channels that don't work and cull 40them from the list. 41