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+.\"	$OpenBSD: ch.4,v 1.12 2011/10/06 20:17:22 sobrado Exp $
+.\"
+.\" Copyright (c) 1996
+.\"	Julian Elischer <julian@freebsd.org>.  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 AND CONTRIBUTORS ``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 OR CONTRIBUTORS 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 $Mdocdate: October 6 2011 $
+.Dt CH 4
+.Os
+.Sh NAME
+.Nm ch
+.Nd SCSI media-changer (juke box) driver
+.Sh SYNOPSIS
+.Cd "ch? at scsibus?"
+.Sh DESCRIPTION
+The
+.Nm
+driver provides support for SCSI juke boxes.
+It allows many slots of media to be multiplexed between a number of drives.
+.Pp
+A SCSI adapter and a logical scsibus must also be separately configured
+into the system before a SCSI changer can be configured.
+.Pp
+As the SCSI adapter is probed during boot, the SCSI bus is scanned for devices.
+Any devices found which answer as
+.Qq Changer
+type devices will be
+.Dq attached
+to the
+.Nm
+driver.
+The first device found will be attached as
+.Em ch0
+and the next
+.Em ch1 ,
+etc.
+It is also possible to specify what
+.Nm
+unit a device should come on-line as; refer to
+.Xr scsi 4
+for details on kernel configuration.
+.\" .Sh IOCTLS
+.\" The following
+.\" .Xr ioctl 2
+.\" call applies to the changer.
+.\" It is defined in the header file
+.\" .Aq Pa sys/chio.h .
+.\" .Bl -tag -width DIOCSDINFO
+.\" .It Dv CHIOOP
+.\" This appears to be a
+.\" .Dq do-everything
+.\" call.
+.\" .El
+.Sh FILES
+.Bl -tag -width /dev/ch[0-9] -compact
+.It Pa /dev/ch[0-9]
+device entries
+.El
+.Sh SEE ALSO
+.Xr chio 1 ,
+.Xr cd 4 ,
+.Xr intro 4 ,
+.Xr scsi 4 ,
+.Xr sd 4 ,
+.Xr st 4
+.Sh HISTORY
+The
+.Nm
+driver appeared in 386BSD 0.1.