.\"	$NetBSD: esm.4,v 1.6 2005/06/22 04:19:09 kent Exp $
.\"
.\" Copyright (c) 2001 Rene Hexel
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.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.