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+.\"	$OpenBSD: haltwo.4,v 1.1 2004/08/06 23:51:59 mickey Exp $
+.\"	$NetBSD: haltwo.4,v 1.3 2004/02/08 23:23:59 snj Exp $
+.\"
+.\" Copyright (c) 2003 Ilpo Ruotsalainen
+.\" 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.
+.\"
+.\" <<Id: LICENSE_GC,v 1.1 2001/10/01 23:24:05 cgd Exp>>
+.\"
+.Dd December 15, 2003
+.Dt HALTWO 4 sgi
+.Os
+.Sh NAME
+.Nm haltwo
+.Nd SGI HAL2 audio controller
+.Sh SYNOPSIS
+.Cd "haltwo0 at hpc0 offset ?"
+.Sh DESCRIPTION
+.Nm
+is the audio controller found on the Indy and Indigo2 machines.
+.Sh SEE ALSO
+.Xr audio 4 ,
+.Xr hpc 4
+.Sh HISTORY
+The
+.Nm
+driver first appeared in
+.Ox 3.6 .
+.Sh CAVEATS
+The driver lacks support for most mixer operations and recording.