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+.\"	$NetBSD: ibus.4,v 1.7 2017/07/25 08:30:45 wiz Exp $
+.\"
+.\" Copyright (c) 1998 MINOURA Makoto
+.\" Copyright (c) 1998 NetBSD Foundation, Inc.
+.\" 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 acknowledgement:
+.\"    This product includes software developed by Minoura Makoto.
+.\" 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 February 17, 2017
+.Dt IBUS 4 pmax
+.Os
+.Sh NAME
+.Nm ibus
+.Nd pmax internal I/O space driver
+.Sh SYNOPSIS
+.Cd "ibus0 at mainbus0"
+.Cd "ibus0 at tc? slot ? offset ?"
+.Sh DESCRIPTION
+.Nm
+is a virtual device corresponding to the pmax internal I/O space found
+on DEC 2100, 3100, 5100 and 5000/200 systems.
+.Pp
+Internal I/O space spans the pmax physical address space, and is
+mapped permanently in the kernel virtual space at the very early time
+of the kernel startup procedure.
+.Pp
+.Nm
+driver manages the internal I/O space of pmax.
+.Bl -bullet -offset indent
+.It
+Address range management to avoid confliction of address space of
+which devices probe by touching hardware port is difficult.
+.It
+Interrupt vector management.
+.It
+.Xr bus_space 9
+and
+.Xr bus_dma 9
+implementation.
+.It
+Other utility functions.
+.El
+.Pp
+.Nm
+is always required to run the
+.Nx
+kernel.
+.Sh SEE ALSO
+.Xr pmax/intro 4 ,
+.Xr bus_dma 9 ,
+.Xr bus_space 9