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69 lines
2.0 KiB
Groff
69 lines
2.0 KiB
Groff
.\" $NetBSD: mavb.4,v 1.1 2007/04/13 03:48:48 jmcneill Exp $
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.\" $OpenBSD: mavb.4,v 1.3 2006/08/31 12:33:42 jmc Exp $
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.\"
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.\" Copyright (c) 2005 Mark Kettenis
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.\"
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.\" Permission to use, copy, modify, and distribute this software for any
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.\" purpose with or without fee is hereby granted, provided that the above
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.\" copyright notice and this permission notice appear in all copies.
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.\"
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.\" THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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.\" WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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.\" MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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.\" ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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.\" WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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.\" ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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.\" OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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.\"
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.Dd April 14, 2007
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.Dt MAVB 4 sgimips
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.Os
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.Sh NAME
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.Nm mavb
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.Nd Moosehead A/V Board audio device
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.Sh SYNOPSIS
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.Cd "mavb0 at mace0 offset 0x300000 intr 6"
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.Cd "audio* at audiobus?"
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.Sh DESCRIPTION
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The
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.Nm
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driver provides support for the Moosehead A/V Board found on SGI
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.Tn O2
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machines.
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.Pp
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The Moosehead A/V Board uses an AD1843 codec that supports 8- and
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16-bit audio sample recording and playback at rates from 5 to 54 kHz,
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with 1 Hz resolution.
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The
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.Nm
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driver also makes it possible to control the playback volume by using
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the buttons on the front of the
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.Tn O2 .
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.Sh SEE ALSO
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.Xr audio 4 ,
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.Xr intro 4 ,
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.Xr mace 4
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.Sh HISTORY
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The
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.Nm
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driver first appeared in
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.Ox 3.7 .
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It was later ported to
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.Nx 5.0 .
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.Sh AUTHORS
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The
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.Nm
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driver was written by Mark Kettenis, and ported to
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.Nx
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by Jared D. McNeill.
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.Sh CAVEATS
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The analog mixer in the AD1843 codec does not provide a master volume
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control.
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Therefore, the
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.Tn O2
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volume buttons only control the output volume of the DAC.
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.Sh BUGS
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Currently only sample rates up to 48 kHz are supported.
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Recording is not implemented yet.
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The second DAC on the AD1843 codec sits idle.
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