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+.\"	$NetBSD: esm.4,v 1.6 2005/06/22 04:19:09 kent Exp $
+.\"
+.\" Copyright (c) 2001 Rene Hexel
+.\" 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. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\" 3. The name of the author may not be used to endorse or promote products
+.\"    derived from this software without specific prior written permission.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+.\" IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+.\" OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+.\" IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+.\" INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+.\" BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+.\" LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+.\" AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+.\" OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+.\" SUCH DAMAGE.
+.\"
+.Dd June 22, 2005
+.Dt ESM 4
+.Os
+.Sh NAME
+.Nm esm
+.Nd ESS Technology Maestro 2/2E PCI Audio Accelerator audio device driver
+.Sh SYNOPSIS
+.Cd "esm*   at pci? dev ? function ?"
+.Cd "audio* at audiobus?"
+.Sh DESCRIPTION
+The
+.Nm
+device driver supports sound cards based on ESS Technology Maestro,
+Maestro-2, and Maestro-2E PCI AC97 Audio Accelerator chips (ES1968 and ES1978).
+Due to their power management capabilities, the Maestro chips are often used
+in laptop and notebook systems.
+.Pp
+The Maestro is a full-duplex device that allows independent playback and
+recording at sample rates between 4000 Hz and 48 kHz.
+The sound processor is capable of handling and converting 8 and 16 bit mono
+and stereo data.
+.Sh SEE ALSO
+.Xr ac97 4 ,
+.Xr audio 4 ,
+.Xr joy 4 ,
+.Xr mpu 4 ,
+.Xr pci 4
+.Sh HISTORY
+The
+.Nm
+device driver appeared in
+.Nx 1.6 .
+.Sh BUGS
+Currently, this driver only supports 16-bit mono recording; an unknown bug
+causes stereo recording to miss a channel.
+Also not supported yet are hardware volume settings, MIDI, and joystick input.