.\"	$OpenBSD: esa.4,v 1.4 2003/01/13 19:06:42 kjell Exp $
.\"	$NetBSD: esa.4,v 1.4 2002/01/24 22:24:19 he Exp $
.\"
.\" Copyright (c) 2001, 2002 Jared D. McNeill <jmcneill@invisible.yi.org>
.\" All rights reserved.
.\"
.\" Redistribution and use in source and binary forms, with or without
.\" modification, are permitted provided that the following conditions
.\" are met:
.\" 1. Redistributions of source code must retain the above copyright
.\"    notice, this list of conditions and the following disclaimer.
.\" 2. Neither the name of the author nor the names of any
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.\"    from this software without specific prior written permission.
.\"
.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS
.\" ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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.\" PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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.Dd April 7, 2002
.Dt ESA 4
.Os
.Sh NAME
.Nm esa
.Nd ESS Technology Allegro-1 / Maestro-3 family audio device driver
.Sh SYNOPSIS
.Cd "esa*   at pci? dev ? function ?"
.Cd "audio* at esa?"
.Sh DESCRIPTION
The
.Nm
driver provides support for the ESS Allegro-1 and Maestro-3 audio devices
on the PCI bus.
These devices are popular in laptop systems.
.Pp
The Allegro-1 and the Maestro-3 are full-duplex devices that allow
independent playback and recording at sample rates between 8000Hz and
48000Hz and are capable of playback at 8 and 16 bit in mono and stereo.
.Sh SEE ALSO
.Xr ac97 4 ,
.Xr audio 4 ,
.Xr intro 4 ,
.Xr maestro 4 ,
.Xr pci 4
.Sh HISTORY
The
.Nm
device driver appeared in
.Ox 3.1 .
.Sh AUTHORS
.An Jared D. McNeill Aq jmcneill@invisible.yi.org
.Sh BUGS
Hardware volume control is not yet supported by this driver.