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+.\" $NetBSD: mem.4,v 1.3 2022/06/13 20:16:53 andvar Exp $
+.\" $OpenBSD: mem.4,v 1.4 2018/01/12 04:36:44 deraadt Exp $
+.\" Copyright (c) 1992, 1993
+.\" The Regents of the University of California. All rights reserved.
+.\"
+.\" This software was developed by the Computer Systems Engineering group
+.\" at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and
+.\" contributed to Berkeley.
+.\"
+.\" 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. Neither the name of the University nor the names of its contributors
+.\" may be used to endorse or promote products derived from this software
+.\" without specific prior written permission.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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.
+.\"
+.\" from: @(#)mem.4 8.1 (Berkeley) 6/5/93
+.\"
+.Dd June 12, 2022
+.Dt MEM 4 luna68k
+.Os
+.Sh NAME
+.Nm mem ,
+.Nm kmem
+.Nd memory files
+.Sh DESCRIPTION
+The file
+.Pa /dev/mem
+is an interface to the physical memory of the
+computer.
+Byte offsets in this file are interpreted as physical memory addresses.
+Reading and writing this file is equivalent to reading and writing
+memory itself.
+An error will be returned if an attempt is made to reference
+an offset outside of
+.Pa /dev/mem .
+.Pp
+Kernel virtual memory is accessed via the file
+.Pa /dev/kmem
+in the same manner as
+.Pa /dev/mem .
+Only kernel virtual addresses that are currently mapped to memory are allowed.
+.Pp
+On the luna68k, physical memory is always contiguous and begins at
+.Ad 0x00000000 ,
+and kernel virtual memory also begins at
+.Ad 0x00000000 .
+.Sh FILES
+.Bl -tag -width /dev/kmem -compact
+.It Pa /dev/mem
+.It Pa /dev/kmem
+.El
+.Sh HISTORY
+The files
+.Nm mem
+and
+.Nm kmem
+appeared in
+.At v6 .