mgx(4) documentation updates.

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+.\"	$OpenBSD: mgx.4,v 1.1 2004/06/20 21:31:02 miod Exp $
+.\" Copyright (c) 2003 Miodrag Vallat.  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.
+.\"
+.\" 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 20, 2004
+.Dt MGX 4 sparc64
+.Os
+.Sh NAME
+.Nm mgx
+.Nd SMS MGX and MGXPlus accelerated 24-bit color frame buffers
+.Sh SYNOPSIS
+.Cd "mgx* at sbus? slot ? offset ?"
+.Cd "wsdisplay* at mgx?"
+.Sh DESCRIPTION
+The
+.Tn Southland Media Systems
+.Pq now Tn "Quantum 3D"
+MGX and MGXPlus are SBus color frame buffers, with graphics acceleration
+capabilities.
+.Pp
+The
+.Nm
+driver interfaces the frame buffer with the
+.Xr wscons 4
+console framework.
+It does not provide direct device driver entry points
+but makes its functions available via the internal
+.Xr wsdisplay 4
+interface.
+.Sh SEE ALSO
+.Xr bwtwo 4 ,
+.Xr cgsix 4 ,
+.Xr cgthree 4 ,
+.Xr creator 4 ,
+.Xr intro 4 ,
+.Xr rfx 4 ,
+.Xr sbus 4 ,
+.Xr vgafb 4 ,
+.Xr wscons 4 ,
+.Xr wsdisplay 4 ,
+.Xr zx 4
+.Sh CAVEATS
+This driver does not support any acceleration features at the moment, and
+drives the card in PROM-compatible, 8 bit, mode only.