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+.\"	$NetBSD: $
+.\"
+.\" Copyright (c) 1996 Jason R. Thorpe <thorpej@and.com>
+.\" 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. All advertising materials mentioning features or use of this software
+.\"    must display the following acknowledgements:
+.\"	This product includes software developed by Jason R. Thorpe
+.\"	for And Communications, http://www.and.com/
+.\" 4. 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.
+.\"
+.Dd April 2, 1996
+.Dt CHIO 1
+.Os
+.Sh NAME
+.Nm chio
+.Nd medium changer control utility
+.Sh SYNOPSIS
+.Nm chio
+.Op Fl f Ar changer
+.Ar command
+.Ar arg1
+.Ar arg2
+.Oo
+.Ar arg3 Oo ...
+.Oc
+.Oc
+.Sh DESCRIPTION
+.Nm Chio
+is used to control the operation of medium changers, such as those found
+in tape and optical disk jukeboxes.
+.Pp
+The options are as follows:
+.Bl -tag -width indent
+.It Fl f Ar changer
+Use the device
+.Pa changer
+rather than the default device
+.Pa /dev/ch0 .
+.El
+.Pp
+The default changer may be overridden by setting the environment variable
+.Nm CHANGER
+to the desired changer device.
+.Pp
+A medium changer apparatus is made up of
+.Pa elements .
+There are four element types:
+.Pa picker
+(medium transport),
+.Pa slot
+(storage),
+.Pa portal
+(import/export), and
+.Pa drive
+(data transfer).  In this command description, the shorthand
+.Nm ET
+will be used to represent an element type, and
+.Nm EU
+will be used to represent an element unit.  For example, to represent
+the first robotic arm in the changer, the ET would be
+.Dq picker
+and the EU would be
+.Dq 0 .
+.Pp
+.Sh SUPPORTED COMMANDS
+.Nm chio move
+.Ar <from ET> <from EU> <to ET> <to EU>
+.Op Ar inv
+.Pp
+Moves the media unit from
+.Pa <from ET/EU>
+to
+.Pa <to ET/EU> .
+If the optional modifier
+.Pa inv
+is specified, the media unit will be inverted before insertion.
+.Pp
+.Nm chio exchange
+.Ar <src ET> <src EU> <dst1 ET> <dst1 EU>
+.Op Ar <dst2 ET> <dst2 ET>
+.Op Ar inv1
+.Op Ar inv2
+.Pp
+Performs a media unit exchange operation.  The media unit in
+.Pa <src ET/EU>
+is moved to
+.Pa <dst1 ET/EU>
+and the media unit previously in
+.Pa <dst1 ET/EU>
+is moved to
+.Pa <dst2 ET/EU> .
+In the case of a simple exchange,
+.Pa <dst2 ET/EU>
+is omitted and the values
+.Pa <src ET/EU>
+are used in their place.
+The optional modifiers
+.Pa inv1
+and
+.Pa inv2
+specify whether the media units are to be inverted before insertion into
+.Pa <dst1 ET/EU>
+and
+.Pa <dst2 ET/EU>
+respecitively.
+.Pp
+Note that not all medium changers support the
+.Nm exchange
+operation; The changer must have multiple free pickers or emulate
+multiple free pickers with transient storage.
+.Pp
+.Nm chio position
+.Ar <to ET> <to EU>
+.Op Ar inv
+.Pp
+Position the picker in front of the element described by
+.Pa <to ET/EU> .
+If the optional modifier
+.Pa inv
+is specified, the media unit will be inverted before insertion.
+.Pp
+Note that not all changers behave as expected when issued this command.
+.Pp
+.Nm chio params
+.Pp
+Report the number of slots, drives, pickers, and portals in the changer,
+and which picker unit the changer is currently configured to use.
+.Pp
+.Nm chio getpicker
+.Pp
+Report which picker unit the changer is currently configured to use.
+.Pp
+.Nm chio setpicker
+.Ar <unit>
+.Pp
+Configure the changer to use picker
+.Pa <unit> .
+.Pp
+.Nm chio status
+.Op Ar <type>
+.Pp
+Report the status of all elements in the changer.  If
+.Pa <type>
+is specified, report the status of all elements of type
+.Pa <type> .
+.Pp
+The status bits are defined as follows:
+.Bl -tag -width indent
+.It Nm FULL
+Element contains a media unit.
+.It Nm IMPEXP
+Media was deposited into element by an outside human operator.
+.It Nm EXCEPT
+Element is in an abnormal state.
+.It Nm ACCESS
+Media in this element is accessible by a picker.
+.It Nm EXENAB
+Element supports passing media (exporting) to an outsite human operator.
+.It Nm INENAB
+Element supports receiving media (importing) from an outside human operator.
+.El
+.Pp
+.Sh EXAMPLES
+.Nm chio move slot 3 drive 0
+.Pp
+Moves the media in slot 3 (fourth slot) to drive 0 (first drive).
+.Pp
+.Nm chio setpicker 2
+Configures the changer to use picker 2 (third picker) for operations.
+.Pp
+.Sh FILES
+/dev/ch0 - default changer device
+.Sh SEE ALSO
+.Xr mt 1 ,
+.Xr mount 8 .
+.Sh AUTHOR
+The
+.Nm chio
+program and SCSI changer driver were written by Jason R. Thorpe
+<thorpej@and.com> for And Communications, http://www.and.com/