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+.\"	$NetBSD: ch.4,v 1.3 2001/09/12 18:19:16 wiz Exp $
+.\"
+.Dd June 10, 1998
+.Dt CH 4
+.Os
+.Sh NAME
+.Nm ch
+.Nd SCSI media changer driver
+.Sh SYNOPSIS
+.Cd "ch* at scsibus? target ? lun ?"
+.Sh DESCRIPTION
+The
+.Nm
+driver is essentially an
+.Xr ioctl 2
+interface to a robot on a
+.Tn SCSI
+bus - a device that will change media (e.g. tapes, CD-ROMs, etc)
+in and out of drives for that media.
+The
+.Xr chio 1
+utility program uses this interface to manipulate such robots.
+.Sh FILES
+.Bl -tag -width /dev/rsdXXXXX -compact
+.It Pa /dev/ch Ns Ar u
+.Tn SCSI
+bus media changer unit
+.Ar u
+.El
+.Pa /usr/include/sys/chio.h
+.Sh DIAGNOSTICS
+.Bl -diag
+.It "ch%d: waiting %d seconds for changer to settle..."
+Some changers require a long time to settle out,
+to do tape inventory, for instance.
+.It "ch%d: offline"
+The changer is not responding.
+.It "ch%d: warning, READ ELEMENT STATUS avail != count"
+.It "ch%d: could not sense element address page"
+.It "ch%d: could not sense capabilities page"
+.El
+.Sh SEE ALSO
+.Xr chio 1 ,
+.Xr ioctl 2 ,
+.Xr cd 4 ,
+.Xr intro 4 ,
+.Xr scsi 4 ,
+.Xr st 4
+.Sh AUTHORS
+.An Jason R. Thorpe