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-.\" 
-.\" Copyright (c) 1994 Joerg Wunsch
-.\" 
-.\" All rights reserved.
-.\" 
-.\" This program is free software.
-.\" 
-.\" 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. All advertising materials mentioning features or use of this software
-.\"    must display the following acknowledgement:
-.\" 	This product includes software developed by Joerg Wunsch
-.\" 4. The name of the developer may not be used to endorse or promote
-.\"    products derived from this software without specific prior written
-.\"    permission.
-.\" 
-.\" THIS SOFTWARE IS PROVIDED BY THE DEVELOPERS ``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 DEVELOPERS 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.
-.\" 
-.\" $Id$
-.\" -hm updated 31.12.94
-.\" 
-.Dd December 31, 1994
-.Dt VGAIO 8
-.Sh NAME
-.Nm vgaio
-.Nd perform input/output on a Video Graphics Array
-.Sh SYNOPSIS
-.Nm vgaio
-.Op Fl d
-.Sh DESCRIPTION
-.Ss Purpose
-.Nm Vgaio
-is used to perform register-level input/output on a Video Graphics Array.
-Since some of the sequences required to access those registers are very
-silly,
-.Nm vgaio
-cares of all the things necessary and allows the user to access the
-registers of several register groups with their symbolic names.
-
-.Ss Options
-.Bl -tag -width 10n -offset indent
-.It Fl d
-Turn on the grammar parser debugger.
-
-.El
-.Ss Command language
-The command language of
-.Nm
-constitutes of some very simple tokens and rules. Commands are executed
-line by line as they are entered. Each line may contain any number of
-semicolon-separated input/output commands.
-
-Symbolic register names look like:
-
-.D1 Ao Em reggroup Ac Ao Em regnumber Ac
-
-with
-.Aq Em regnumber
-being any hexadecimal number
-.Pq without a leading Em 0x ,
-and
-.Aq Em reggroup
-one of the strings
-.Dq Em ar ,
-.Dq Em cr ,
-.Dq Em gr ,
-.Dq Em mi ,
-or
-.Dq Em sr ,
-standing for the
-.Em Attribute controller ,
-.Em CRT controller ,
-.Em Graphics controller ,
-.Em Miscellaneous Output Register ,
-or
-.Em Timing sequencer ,
-respectively.
-
-An input instruction has the form
-
-.D1 Ao Em regname Ac ?
-
-and will cause
-.Nm
-to output a line like
-
-.Bd -ragged -offset indent
-.Ao Em regname Ac \& = 0x Ns
-.Aq Em number
-.Ed
-
-An output instruction looks like
-
-.Bd -ragged -offset indent
-.Ao Em regname Ac =
-.Aq Em number
-.Ed
-
-Spaces or Tabs between the
-.Aq Em reggroup ,
-the
-.Aq Em regnumber ,
-or any of the other tokens are ignored. They are not required anyway.
-
-The 
-.Dq Em mi
-needs a single unused argument to satisfy the syntax :-) (-hm).
-
-
-.Ss Access control
-The caller must have uid 0 in order to gain the required access to
-the IO registers.
-
-.Sh HISTORY
-This program is considered
-.Dq hackware .
-It has been developed in order to simplify the process of developing other
-software that needs to program the Video Graphics Array.
-
-Remember, to use this program, your kernel has to be compiled with XSERVER
-being defined !
-
-.Sh AUTHORS
-The program has been contributed by
-.if n Joerg Wunsch,
-.if t J\(:org Wunsch,
-Dresden
-.Aq joerg_wunsch@uriah.sax.de .