ac97(4) [netbsd man page]

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

NAME

     ac97 -- generic AC97 codec driver

DESCRIPTION

     AC97 codecs contain the analog-to-digital (A/D), digital-to-analog (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

     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)

BUGS

     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

NEO(4)							   BSD Kernel Interfaces Manual 						    NEO(4)

NAME

     neo -- NeoMagic MagicMedia 256 audio device driver

SYNOPSIS

     neo*   at pci? dev ? function ?
     audio* at audiobus?

DESCRIPTION

     The neo driver provides support for the NeoMagic MagicMedia 256AV and 256ZX AC'97 audio devices, found on many laptops.

     The MagicMedia 256AV also comes in a variant (usually found on Dell and HP laptops) that works in Windows Sound System emulation mode, not in
     AC'97 mode.  That variant of the chip must be used with the wss(4) driver.  The neo driver will not attach to such chips.

SEE ALSO

     ac97(4), audio(4), intro(4), midi(4), pci(4), wss(4)

HISTORY

     The neo device driver appeared in NetBSD 1.5.1.

BUGS

     The MagicMedia 256 series is not well-documented.

     No MIDI or FM synthesizer capability is provided with the MagicMedia 256 in AC'97 mode.  While those capabilities are provided by the Windows
     driver for the chip, they are emulated by the Windows driver, and not directly supported by the hardware.

BSD
								   June 22, 2005							       BSD