1.\" $NetBSD: mavb.4,v 1.2 2017/02/17 22:24:47 christos Exp $ 2.\" $OpenBSD: mavb.4,v 1.3 2006/08/31 12:33:42 jmc Exp $ 3.\" 4.\" Copyright (c) 2005 Mark Kettenis 5.\" 6.\" Permission to use, copy, modify, and distribute this software for any 7.\" purpose with or without fee is hereby granted, provided that the above 8.\" copyright notice and this permission notice appear in all copies. 9.\" 10.\" THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES 11.\" WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 12.\" MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR 13.\" ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 14.\" WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 15.\" ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF 16.\" OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 17.\" 18.Dd February 17, 2017 19.Dt MAVB 4 sgimips 20.Os 21.Sh NAME 22.Nm mavb 23.Nd Moosehead A/V Board audio device 24.Sh SYNOPSIS 25.Cd "mavb0 at mace0 offset 0x300000 intr 6" 26.Cd "audio* at audiobus?" 27.Sh DESCRIPTION 28The 29.Nm 30driver provides support for the Moosehead A/V Board found on SGI 31.Tn O2 32machines. 33.Pp 34The Moosehead A/V Board uses an AD1843 codec that supports 8- and 3516-bit audio sample recording and playback at rates from 5 to 54 kHz, 36with 1 Hz resolution. 37The 38.Nm 39driver also makes it possible to control the playback volume by using 40the buttons on the front of the 41.Tn O2 . 42.Sh SEE ALSO 43.Xr audio 4 , 44.Xr sgimips/intro 4 , 45.Xr sgimips/mace 4 46.Sh HISTORY 47The 48.Nm 49driver first appeared in 50.Ox 3.7 . 51It was later ported to 52.Nx 5.0 . 53.Sh AUTHORS 54The 55.Nm 56driver was written by Mark Kettenis, and ported to 57.Nx 58by Jared D. McNeill. 59.Sh CAVEATS 60The analog mixer in the AD1843 codec does not provide a master volume 61control. 62Therefore, the 63.Tn O2 64volume buttons only control the output volume of the DAC. 65.Sh BUGS 66Currently only sample rates up to 48 kHz are supported. 67Recording is not implemented yet. 68The second DAC on the AD1843 codec sits idle. 69