Add man page for COMPAT_BSDOS.

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+.\"	$OpenBSD: compat_bsdos.8,v 1.1 1997/09/02 10:02:42 downsj Exp $
+.\"
+.\" Copyright (c) 1997, Jason Downs.  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 Jason Downs for the
+.\"      OpenBSD system.
+.\" 4. Neither the name(s) of the author(s) nor the name OpenBSD
+.\"    may be used to endorse or promote products derived from this software
+.\"    without specific prior written permission.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR(S) ``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(S) 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 September 2, 1997
+.Dt compat_bsdos 8
+.Os
+.Sh NAME
+.Nm compat_bsdos
+.Nd setup procedure for running BSD/OS binaries
+.Sh DESCRIPTION
+OpenBSD supports the execution of BSD/OS binaries; most binaries should
+work, at least from the BSD/OS 2.1 era.  Some things that are not currently
+supported are proprietary extensions made to the BSD/OS kernel.
+.Pp
+To activate the BSD/OS compatibility feature, the kernel must be compiled
+with the
+.Nm COMPAT_BSDOS
+option enabled.
+.Pp
+.Nm COMPAT_BSDOS
+follows the standard
+.Dq emul
+filesystem scheme, using
+.Pa /emul/bsdos
+as the prefix.  This means that all BSD/OS executables first look in
+.Pa /emul/bsdos
+whenever opening a file; configuration information, shared library images,
+etc., for BSD/OS binaries should all be installed under the emulation
+directory in order to avoid conflicts with native files.
+.Pp
+Although many commercial BSD/OS binaries are
+.Dq pure
+(in that they need no shared libraries), system binaries and those
+compiled/linked with the
+BSD/OS
+.\" no .Xr here because we don't have junk like shlicc.
+.Nm shlicc
+program require the appropriate shared library images.  These may be
+found in the
+.Pa /shlib
+directory on a BSD/OS system, and must be copied to
+.Pa /emul/bsdos/shlib
+in order for such binaries to work.  The user is responsible for having
+the appropiate BSD/OS licenses in order to use the shared library images.
+.Sh BUGS
+If BSDi ever manages to port their system to more architectures or switch
+to real dynamically linked libraries these instructions may have to change.
+.Pp
+.Nm COMPAT_BSDOS
+is currently only supported on the i386.