767 lines
15 KiB
Groff
767 lines
15 KiB
Groff
.\"
|
|
.\" Copyright (c) 1992, 1993, 1996
|
|
.\" Berkeley Software Design, 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 Berkeley Software
|
|
.\" Design, Inc.
|
|
.\"
|
|
.\" THIS SOFTWARE IS PROVIDED BY Berkeley Software Design, Inc. ``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 Berkeley Software Design, Inc. 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.
|
|
.\"
|
|
.\" BSDI doscmd.1,v 2.3 1996/04/08 19:32:29 bostic Exp
|
|
.\" $FreeBSD$
|
|
.\"
|
|
.Dd January 30, 1995
|
|
.Dt DOSCMD 1
|
|
.Os
|
|
.Sh NAME
|
|
.Nm doscmd
|
|
.Nd run a subset of real-mode DOS programs
|
|
.Sh SYNOPSIS
|
|
.Nm
|
|
.Fl 23AbDEfGHIMOPRrtVvXxYz
|
|
.Fl c Ar file
|
|
.Fl d Ar file
|
|
.Fl i Ar port Ns Xo
|
|
.Op : Ns Ar cnt
|
|
.Xc
|
|
.Fl o Ar port Ns Xo
|
|
.Op : Ns Ar cnt
|
|
.Xc
|
|
.Fl S Ar int
|
|
.Fl U Ar int
|
|
.Op Ar cmd Op Ar args ...
|
|
.Sh DESCRIPTION
|
|
The
|
|
.Nm
|
|
utility can either emulate a subset of DOS and run the
|
|
single command
|
|
.Ar cmd
|
|
.Ar args ,
|
|
or it can be used to emulate a PC and boot DOS,
|
|
which allows it to run a larger variety of DOS applications.
|
|
It should be noted that MS DOS 6.2 and higher appear
|
|
to cause difficulties for
|
|
.Nm .
|
|
To boot DOS, either provide the
|
|
.Fl b
|
|
flag or omit the
|
|
.Ar cmd
|
|
argument.
|
|
If
|
|
.Fl b
|
|
is specified,
|
|
.Ar cmd
|
|
and
|
|
.Ar args
|
|
are ignored.
|
|
.Pp
|
|
Although
|
|
.Nm
|
|
only provides a subset of DOS, it is sufficient to run a variety of
|
|
programs, including, but not limited to, compilers, assemblers and
|
|
linker-loaders.
|
|
.Pp
|
|
The various flags available to
|
|
.Nm
|
|
are:
|
|
.Bl -tag -width indent
|
|
.It Fl 2
|
|
Enable debugging traces of every trap to the
|
|
.Nm
|
|
emulator from the DOS program.
|
|
Note that some traps are handled in the kernel and hence will not
|
|
be traced.
|
|
.It Fl 3
|
|
Enable debugging of several lower level functions, such
|
|
as changing of interrupt vectors and initializing paths to logical drives.
|
|
.\"
|
|
.\"
|
|
.\"
|
|
.It Fl A
|
|
Enable tracing of all interrupts that pass into the emulator.
|
|
This is the same as using the
|
|
.Fl S
|
|
option with all 256 possible interrupt values.
|
|
.\"
|
|
.\"
|
|
.\"
|
|
.It Fl b
|
|
Attempt to boot DOS rather than emulate it.
|
|
.\"
|
|
.\"
|
|
.\"
|
|
.It Fl c Ar file
|
|
Capture all output directed at the screen into
|
|
.Ar file .
|
|
Note that direct screen writes will not be captured.
|
|
.\"
|
|
.\"
|
|
.\"
|
|
.It Fl C
|
|
List MS-DOS calls emulated and their return values.
|
|
.\"
|
|
.\"
|
|
.\"
|
|
.It Fl D
|
|
Enable debugging of the disk and file operations.
|
|
.\"
|
|
.\"
|
|
.\"
|
|
.It Fl d Ar file
|
|
Send the debug output to
|
|
.Ar file
|
|
instead of stderr.
|
|
.\"
|
|
.\"
|
|
.\"
|
|
.It Fl E
|
|
Enable debugging of the exec routines.
|
|
.\"
|
|
.\"
|
|
.\"
|
|
.It Fl G
|
|
Enable debugging of the video (graphics) routines.
|
|
.\"
|
|
.\"
|
|
.\"
|
|
.It Fl H
|
|
Enable tracing of half implemented calls.
|
|
.\"
|
|
.\"
|
|
.\"
|
|
.It Fl I
|
|
Enable tracing of all interrupts. Almost the same as
|
|
.Fl A
|
|
except a few less traces are turned on.
|
|
.\"
|
|
.\"
|
|
.\"
|
|
.It Fl i Ar port Ns Xo
|
|
.Op : Ns Ar cnt
|
|
.Xc
|
|
Enable tracing of all inputs requested from the io
|
|
.Ar port .
|
|
If
|
|
.Ar cnt
|
|
is present, trace from
|
|
.Ar port
|
|
to
|
|
.Ar port+cnt Ns No -1 .
|
|
.\"
|
|
.\"
|
|
.\"
|
|
.It Fl M
|
|
Enable debugging of the memory operations.
|
|
.\"
|
|
.\"
|
|
.\"
|
|
.It Fl O
|
|
Direct the debugging output to stdout rather than stderr.
|
|
.\"
|
|
.\"
|
|
.\"
|
|
.It Fl o Ar port Ns Xo
|
|
.Op : Ns Ar cnt
|
|
.Xc
|
|
Enable tracing of all outputs requested from the io
|
|
.Ar port .
|
|
If
|
|
.Ar cnt
|
|
is present, trace from
|
|
.Ar port
|
|
to
|
|
.Ar port+cnt Ns No -1 .
|
|
.\"
|
|
.\"
|
|
.\"
|
|
.It Fl p Ar port Ns Xo
|
|
.Op : Ns Ar cnt
|
|
.Xc
|
|
Map the requested io
|
|
.Ar port
|
|
(with optional range up to to
|
|
.Ar port+cnt Ns No -1 )
|
|
to the real hardware I/O port(s).
|
|
This will likely require root privs to access them.
|
|
.\"
|
|
.\"
|
|
.\"
|
|
.It Fl P
|
|
Enable tracing of io port calls (such as
|
|
.Li inb ,
|
|
.Li outb ,
|
|
etc).
|
|
.\"
|
|
.\"
|
|
.\"
|
|
.It Fl R
|
|
Enable debugging of the file redirect code.
|
|
.\"
|
|
.\"
|
|
.\"
|
|
.It Fl r
|
|
Use the raw keyboard and display. Pressing <CTRL-ALT-DEL> will
|
|
cause doscmd to exit. This allows use of VGA graphics.
|
|
.\"
|
|
.\"
|
|
.\"
|
|
.It Fl S Ar int
|
|
Enable tracing of the interrupt
|
|
.Ar int .
|
|
.\"
|
|
.\"
|
|
.\"
|
|
.It Fl t
|
|
Attempt to do instruction level tracing.
|
|
Some instructions confuse the trace.
|
|
Pressing
|
|
.Li <CTRL-ALT-T>
|
|
attempts to toggle the trace mode on and off.
|
|
.\"
|
|
.\"
|
|
.\"
|
|
.It Fl U Ar int
|
|
Disable tracing of the interrupt
|
|
.Ar int .
|
|
Useful after
|
|
.Fl A
|
|
or
|
|
.Fl I .
|
|
.\"
|
|
.\"
|
|
.\"
|
|
.It Fl V
|
|
Include register dumps when reporting unknown interrupts.
|
|
.\"
|
|
.\"
|
|
.\"
|
|
.It Fl v
|
|
Same as
|
|
.Fl AH
|
|
.\"
|
|
.\"
|
|
.\"
|
|
.It Fl X
|
|
Enable debugging of the XMS operations.
|
|
.\"
|
|
.\"
|
|
.\"
|
|
.It Fl x
|
|
Open an X11 window to display output. This enables a
|
|
variety interrupts not available otherwise. This
|
|
can be used with or without
|
|
.Fl b .
|
|
.\"
|
|
.\"
|
|
.\"
|
|
.It Fl Y
|
|
Enable debugging of the EMS operations.
|
|
.\"
|
|
.\"
|
|
.\"
|
|
.It Fl z
|
|
Cause
|
|
.Nm
|
|
to pause just prior to jumping to the DOS program.
|
|
Very little use except for developing
|
|
.Nm .
|
|
.El
|
|
.Pp
|
|
When starting up,
|
|
.Nm
|
|
attempts to read a configuration file. First the file
|
|
.Cm .doscmdrc
|
|
in the current directory. If not found there, the
|
|
.Cm $HOME
|
|
directory is searched. If still not found, the file
|
|
.Cm /etc/doscmdrc
|
|
is used.
|
|
.Pp
|
|
In the configuration file, a comment is started with the \fB#\fP character.
|
|
Blank lines are ignored.
|
|
Non empty lines either are environment variables
|
|
or commands which configure devices.
|
|
Any line which has an \fB=\fP before any white space is considered to be
|
|
an environment variable assignment and is added to the DOS environment.
|
|
The rest of the lines are one of the following
|
|
.Bl -tag -width XXXXX
|
|
.\"
|
|
.\"
|
|
.\"
|
|
.It Cm boot Op Cm A: | C:
|
|
Set the device to boot from.
|
|
By default
|
|
.Cm A:
|
|
is first tried, if it is defined, and if that fails,
|
|
.Cm C:
|
|
is tried.
|
|
.\"
|
|
.\"
|
|
.\"
|
|
.It Cm assign Xo
|
|
.Op Cm A-Z :
|
|
.Op Fl ro
|
|
.Ar path
|
|
.Xc
|
|
Assigns the
|
|
.Bsx
|
|
directory
|
|
.Ar path
|
|
to be assigned as the specified drive. If the
|
|
.Fl ro
|
|
flag is specified, it is a read only file system.
|
|
These assignments will not take place when booting DOS until the
|
|
.Pa /usr/libdata/doscmd/redir.com
|
|
binary is run.
|
|
.\"
|
|
.\"
|
|
.\"
|
|
.It Cm assign Xo
|
|
.Cm lpt Ns Op Cm 0-4 :
|
|
.Op Cm direct
|
|
.Ar path
|
|
.Op Ar timeout
|
|
.Xc
|
|
Attempt to assign the specified printer to
|
|
.Ar path .
|
|
If
|
|
.Ar timeout
|
|
is specified then use it as the length of time for no
|
|
activity (in seconds) to indicate that the printer
|
|
should be flushed. The default is 30 seconds.
|
|
The
|
|
.Cm direct
|
|
option should be set when
|
|
.Ar path
|
|
refers to a real printer.
|
|
.\"
|
|
.\"
|
|
.\"
|
|
.It Cm assign Xo
|
|
.Op Cm A: | B:
|
|
.Op Fl ro
|
|
.Ar path
|
|
.Ar density
|
|
.Xc
|
|
.It Cm assign Xo
|
|
.Cm flop Ns Op Cm 01
|
|
.Op Fl ro
|
|
.Ar path
|
|
.Ar density
|
|
.Xc
|
|
Assign the file
|
|
.Ar path
|
|
to be used as either the next available floppy or
|
|
to the specified floppy.
|
|
If
|
|
.Fl ro
|
|
is specified the floppy will be read only.
|
|
The
|
|
.Ar density
|
|
may be one of:
|
|
.Pp
|
|
.Bl -tag -compact -width 1440x
|
|
.It 180
|
|
9 head 40 track single sided floppy
|
|
.It 360
|
|
9 head 40 track double sided floppy
|
|
.It 720
|
|
9 head 80 track double sided floppy
|
|
.It 1200
|
|
15 head 80 track double sided floppy
|
|
.It 1440
|
|
18 head 80 track double sided floppy
|
|
.It 2880
|
|
36 head 80 track double sided floppy
|
|
.El
|
|
.\"
|
|
.\"
|
|
.\"
|
|
.It Cm assign Xo
|
|
.Op Cm C-Z :
|
|
.Op Fl ro
|
|
.Ar path
|
|
.Op Ar type | cyl head sec
|
|
.Op Ar fdisk_tab
|
|
.Xc
|
|
.It Cm assign Xo
|
|
.Cm hard Ns Op Cm 01
|
|
.Op Fl ro
|
|
.Ar path
|
|
.Op Ar type | cyl head sec
|
|
.Op Ar fdisk_tab
|
|
.Xc
|
|
Assign the file
|
|
.Ar path
|
|
to be used as either the next available hard disk or
|
|
to the specified hard disk.
|
|
A disk's geometry can either be directly specified with
|
|
.Ar cyl
|
|
being the number of cylinders,
|
|
.Ar head
|
|
the number of heads and
|
|
.Ar sec
|
|
the number of sectors per track,
|
|
or it can be one of the standard types specified by
|
|
.Ar type
|
|
(see below).
|
|
The option
|
|
.Ar fdisk_tab
|
|
argument specifies file to use as the first sector
|
|
of this disk. This can be useful for inserting a
|
|
false fdisk table when
|
|
.Ar path
|
|
only refers to part of a disk.
|
|
.\"
|
|
.\"
|
|
.\"
|
|
.It Cm assign Xo
|
|
.Cm com Ns Op Cm 1-4 :
|
|
.Ar path
|
|
.Ar port
|
|
.Ar irq
|
|
.Xc
|
|
Assign the tty or pty specified by
|
|
.Ar path
|
|
to be used as the specified com port.
|
|
Its base address will be emulated at
|
|
.Ar port
|
|
at interrupt specified by
|
|
.Ar irq .
|
|
This code is lightly tested and may not suit all needs.
|
|
.\"
|
|
.\"
|
|
.\"
|
|
.It Cm portmap Xo
|
|
.Ar port
|
|
.Op Ar count
|
|
.Xc
|
|
Map the requested io
|
|
.Ar port
|
|
(with optional range up to to
|
|
.Ar port+count Ns No -1 )
|
|
to the real hardware I/O port(s).
|
|
This will likely require root privs to access them.
|
|
.\"
|
|
.\"
|
|
.\"
|
|
.It Cm "setver command version"
|
|
Cause doscmd, when emulating DOS, to report
|
|
.Cm version
|
|
as the version number of DOS when called from the program named
|
|
.Cm command .
|
|
The format of
|
|
.Cm version
|
|
is the same as of the
|
|
.Cm MS_VERSION
|
|
variable described below.
|
|
.El
|
|
.Pp
|
|
If not already assigned,
|
|
.Cm C:
|
|
will be assigned to the root directory (/) and the current directory
|
|
for
|
|
.Cm C:
|
|
will be set to the actual current directory.
|
|
Note that this means that invocations such as:
|
|
.Pp
|
|
.Dl "doscmd ../foo
|
|
.Pp
|
|
will not work as the
|
|
.Cm C:
|
|
directory will start with the current path.
|
|
Also, the following environment variables will be defined if not
|
|
already defined:
|
|
.Bd -literal
|
|
.Cm "COMSPEC=C:\eCOMMAND.COM
|
|
.Cm "PATH=C:\e
|
|
.Cm "PROMPT=DOS>
|
|
.Ed
|
|
.Pp
|
|
The
|
|
.Cm PATH
|
|
variable is also used to find
|
|
.Ar cmd .
|
|
Like DOS, first
|
|
.Ar cmd.com
|
|
will be looked for and then
|
|
.Ar cmd.exe .
|
|
.Sh "CONFIGURATION VARIABLES"
|
|
There are several variables in the
|
|
.Cm .doscmdrc
|
|
file which are internal to doscmd and do not actually get inserted into
|
|
the DOS environment. These are:
|
|
.Bl -tag -width MS_VERSION
|
|
.It Cm MS_VERSION
|
|
The value of this variable is used to determine the version of DOS that
|
|
should be reported by
|
|
.Nm .
|
|
Note that
|
|
.Nm
|
|
will not change the way
|
|
it works, just the way it reports. By default this value is
|
|
.Cm 410 ,
|
|
which corresponds to
|
|
.Tn "MS DOS
|
|
version 4.1.
|
|
To change it to version 3.2 (the default in previous versions of
|
|
.Nm )
|
|
use the value of
|
|
.Cm 320 .
|
|
.It Cm X11_FONT
|
|
The value of this variable determines the font used in an X window.
|
|
The default font is
|
|
.Cm vga ,
|
|
which is installed in
|
|
.Pa /usr/libdata/doscmd/fonts .
|
|
Add the line
|
|
.Ql xset fp+ /usr/libdata/doscmd/fonts
|
|
to your
|
|
.Pa ${HOME}/.xsession
|
|
or
|
|
.Pa ${HOME}/.xinitrc
|
|
to let the X server find it.
|
|
.El
|
|
.Sh FILE TRANSLATION
|
|
The
|
|
.Nm
|
|
utility translates
|
|
.Bsx
|
|
file names into
|
|
.Tn DOS
|
|
file names by converting to all upper case and eliminating any invalid
|
|
character. It does not make any attempt to convert ASCII files into
|
|
the
|
|
.Cm <CR><LF>
|
|
format favored in the DOS world. Use
|
|
.Xr fconv 1
|
|
(part of the ports collection) or similar tools to convert ASCII files.
|
|
.bp
|
|
.Sh DISK TYPES
|
|
.TS H
|
|
expand, box;
|
|
r | r | r | r | r.
|
|
Type Cylinders Heads Sectors Size
|
|
=
|
|
01 306 4 17 10MB
|
|
02 615 4 17 20MB
|
|
03 615 6 17 30MB
|
|
04 940 8 17 62MB
|
|
05 940 6 17 46MB
|
|
_
|
|
06 615 4 17 20MB
|
|
07 462 8 17 30MB
|
|
08 733 5 17 30MB
|
|
09 900 15 17 112MB
|
|
10 820 3 17 20MB
|
|
_
|
|
11 855 5 17 35MB
|
|
12 855 7 17 49MB
|
|
13 306 8 17 20MB
|
|
14 733 7 17 42MB
|
|
15 976 15 17 121MB
|
|
_
|
|
16 612 4 17 20MB
|
|
17 977 5 17 40MB
|
|
18 977 7 17 56MB
|
|
19 1024 7 17 59MB
|
|
20 733 5 17 30MB
|
|
_
|
|
21 733 7 17 42MB
|
|
22 733 5 17 30MB
|
|
23 306 4 17 10MB
|
|
24 925 7 17 53MB
|
|
25 925 9 17 69MB
|
|
_
|
|
26 754 7 17 43MB
|
|
27 754 11 17 68MB
|
|
28 699 7 17 40MB
|
|
29 823 10 17 68MB
|
|
30 918 7 17 53MB
|
|
_
|
|
31 1024 11 17 93MB
|
|
32 1024 15 17 127MB
|
|
33 1024 5 17 42MB
|
|
34 612 2 17 10MB
|
|
35 1024 9 17 76MB
|
|
_
|
|
36 1024 8 17 68MB
|
|
37 615 8 17 40MB
|
|
38 987 3 17 24MB
|
|
39 987 7 17 57MB
|
|
40 820 6 17 40MB
|
|
_
|
|
41 977 5 17 40MB
|
|
42 981 5 17 40MB
|
|
43 830 7 17 48MB
|
|
44 830 10 17 68MB
|
|
45 917 15 17 114MB
|
|
_
|
|
46 1224 15 17 152MB
|
|
.TE
|
|
.bp
|
|
.Sh INSTALLING DOS ON A PSEUDO DISK
|
|
To install DOS on a pseudo hard disk under doscmd, do the following:
|
|
.Bl -tag -width XXXX
|
|
.It 1
|
|
Create a
|
|
.Pa .doscmdrc
|
|
with at least the following:
|
|
.Bd -literal -offset indent
|
|
assign A: /dev/fd0.1440 1440
|
|
assign A: /dev/fd0.720 720
|
|
assign hard boot_drive 80 2 2
|
|
.Ed
|
|
.Pp
|
|
You may need to adjust the raw files for the A: drive to match
|
|
your system. This example will cause the HD drive to be tried
|
|
first and the DD drive second.
|
|
.Pp
|
|
Note that you should only use raw devices or files at this point,
|
|
do not use a cooked device! (Well, it would probably be okay
|
|
for a hard disk, but certainly not the floppy)
|
|
.Pp
|
|
.Li boot_drive
|
|
should be the file name of where you want your bootable
|
|
image to be. The three numbers which follow
|
|
.Li 80 2 2
|
|
say that the drive will have 80 cylinders, 2 heads and 2 sectors per track.
|
|
This is the smallest drive possible which still can have MS DOS
|
|
5.0 installed on it along with a
|
|
.Pa config.sys
|
|
and
|
|
.Pa autoexec.bat
|
|
file.
|
|
.Pp
|
|
You might want to create a larger boot drive.
|
|
.Pp
|
|
The file
|
|
.Pa boot_drive
|
|
must exist, so use the command touch to create it.
|
|
.It 2
|
|
Insert a floppy disk into the A: drive which is bootable to MS-DOS
|
|
and has the commands fdisk, format and sys on it. You should also
|
|
copy the file redir.com onto the floppy by either mounting it
|
|
with the msdos file system type or by using mtools
|
|
(e.g.,
|
|
.Dq Li mwrite redir.com a: ) .
|
|
.It 3
|
|
run doscmd.
|
|
.It 4
|
|
At the > prompt type
|
|
.Li fdisk .
|
|
.It 5
|
|
Select
|
|
.Li Create DOS partition or Logical Drive .
|
|
.It 6
|
|
Select
|
|
.Li Create Primary DOS Partition .
|
|
.It 7
|
|
Tell it how big to make it
|
|
(Typically the whole drive. It is pretty tiny after all.)
|
|
.It 8
|
|
Get out of FDISK by hitting
|
|
.Li <ESC>
|
|
a few times.
|
|
.It 9
|
|
doscmd may abort, if it does, start up doscmd again.
|
|
.It 10
|
|
At the > prompt, type
|
|
.Li format c:
|
|
and follow the instructions.
|
|
.It 11
|
|
At the > prompt type
|
|
.Li sys c: .
|
|
.It 12
|
|
Get out of doscmd.
|
|
.It 13
|
|
Either remove the floppy from the drive or add the line
|
|
.Bd -literal -offset indent
|
|
boot C:
|
|
.Ed
|
|
to your
|
|
.Pa .doscmdrc .
|
|
.It 14
|
|
You should now be running DOS off of your new disk. You will
|
|
probably want both config.sys and an autoexec.bat file. To
|
|
start with, you can say:
|
|
.Bd -literal -offset indent
|
|
> copy con: config.sys
|
|
LASTDRIVE=Z
|
|
^Z
|
|
> copy con: autoexec.bat
|
|
@echo off
|
|
redir.com
|
|
^Z
|
|
.Ed
|
|
.It 15
|
|
Quit doscmd.
|
|
.It 16
|
|
You know have a bootable pseudo disk which will automatically call
|
|
the magic
|
|
.Li redir
|
|
program, which installs
|
|
.Fx
|
|
disks. To use
|
|
them add lines to your .doscmdrc such as:
|
|
.Bd -literal -offset indent
|
|
assign D: /usr/dos
|
|
assign P: -ro /usr/prb
|
|
.Ed
|
|
Note that you will not always be able to access every file due to
|
|
naming problems.
|
|
.El
|
|
.Sh DIAGNOSTICS
|
|
If
|
|
.Nm
|
|
encounters an interrupt which is unimplemented, it will print a message
|
|
such as:
|
|
.Pp
|
|
.Dl Unknown interrupt 21 function 99
|
|
.Pp
|
|
and exit.
|
|
.Pp
|
|
If
|
|
.Nm
|
|
emits the message
|
|
.Ic X11 support not compiled in
|
|
when supplied the
|
|
.Fl x
|
|
switch, this support can be added by defining an environment variable
|
|
.Ev X11BASE
|
|
which points to the installed X Window System (normally
|
|
.Pa /usr/X11R6 )
|
|
and then typing
|
|
.Ic make install
|
|
in the source directory (normally
|
|
.Pa /usr/src/usr.bin/doscmd ) .
|
|
For this to work, the X programmer's kit must have been installed.
|
|
.Sh AUTHORS
|
|
.An Pace Willisson ,
|
|
.An Paul Borman
|
|
.Sh HISTORY
|
|
The
|
|
.Nm
|
|
program first appeared in
|
|
.Tn BSD/386 .
|