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+.\" $OpenBSD: mcbus.4,v 1.5 2015/11/21 08:04:20 jmc Exp $
+.\" $NetBSD: mcbus.4,v 1.1 2001/09/21 09:11:44 gmcgarry Exp $
+.\"
+.\" Copyright (c) 2001 The NetBSD Foundation, Inc.
+.\" All rights reserved.
+.\"
+.\" This code is derived from software contributed to The NetBSD Foundation
+.\" by Gregory McGarry.
+.\"
+.\" 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 NETBSD FOUNDATION, INC. 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 FOUNDATION 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: November 21 2015 $
+.Dt MCBUS 4 alpha
+.Os
+.Sh NAME
+.Nm mcbus ,
+.Nm mcmem
+.Nd MCBUS system bus
+.Sh SYNOPSIS
+.Cd "mcbus* at mainbus0"
+.Cd "mcmem* at mcbus? mid ?"
+.Sh DESCRIPTION
+The
+.Nm
+driver provides support for the MCBUS system bus found on AlphaServer 4100
+and 1200 systems.
+.Pp
+The following devices are supported by the
+.Nm
+driver:
+.Pp
+.Bl -tag -width mcclock -offset indent -compact
+.It mcmem
+memory modules attached to the MCBUS main system bus.
+.It mcpcia
+MCPCIA MCBUS-to-PCI bus adapter
+.El
+.Sh SEE ALSO
+.Xr intro 4 ,
+.Xr mainbus 4 ,
+.Xr mcpcia 4
+.Sh BUGS
+Only one MCBUS bus can exist within the system.