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+.\" Copyright (c) 1980, 1991 Regents of the University of California.
+.\" 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 the University of
+.\"	California, Berkeley and its contributors.
+.\" 4. 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	6.3 (Berkeley) 3/27/91
+.\"	$Id: mem.4,v 1.1 1995/10/18 08:44:35 deraadt Exp $
+.\"
+.Dd March 27, 1991
+.Dt MEM 4 vax
+.Os BSD 4
+.Sh NAME
+.Nm mem ,
+.Nm kmem ,
+.Nm kUmem
+.Nd memory files
+.Sh DESCRIPTION
+The special file
+.Nm /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.
+Only offsets within the bounds of
+.Nm /dev/mem
+are allowed.
+.Pp
+Kernel virtual memory is accessed through the interface
+.Nm /dev/kmem
+in the same manner as
+.Nm /dev/mem .
+Only kernel virtual addresses that are currently mapped to memory are allowed.
+.Pp
+The file
+.Nm /dev/kUmem
+also refers to kernel virtual memory,
+but may be used to access areas mapped to
+.Tn UNIBUS
+address space
+and other
+.Tn I/O
+areas.
+It forces all accesses to use word (short integer) accesses.
+.Pp
+On the
+.Tn VAX
+11/780,
+the
+.Tn I/O
+space base address is
+20000000(16);
+on an 11/750
+the
+.Tn I/O space addresses are of the form fxxxxx(16).
+On all
+.Tn VAX Ns 'en
+the
+per-process data
+size
+for the current process
+is
+.Dv UPAGES
+long and ends at the virtual address 80000000(16).
+.Sh FILES
+.Bl -tag -width Pa -compact
+.It Pa /dev/mem
+.It Pa /dev/kmem
+.It Pa /dev/kUmem
+.El
+.Sh HISTORY
+The
+.Nm mem ,
+.Nm kmem
+files appeared in
+.At v6 .
+The file
+.Nm kUmem
+appeared in
+.Bx 3.0 .