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MS-DOS KERMIT USER GUIDE
FOR THE IBM PC FAMILY, COMPATIBLES, AND OTHER MS-DOS SYSTEMS
C. Gianone, F. da Cruz
Columbia University Center for Computing Activities
New York, New York 10027
J.R. Doupnik
CASS and EE, Utah State University, Logan, UT 84322
January 8, 1988
Copyright (C) 1981,1988
Trustees of Columbia University in the City of New York
Permission is granted to any individual or institution to use, copy,
or redistribute this document so long as it is not sold for profit, and
provided this copyright notice is retained.
1. MS-DOS KERMIT
--------
This document is formatted as an ordinary, plain text ASCII disk file, from
SCRIBE text formatter source. Typeset copies are available from Columbia
University.
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Program: Joe R. Doupnik (Utah State University), with contributions by
James Harvey (Indiana/Purdue University), James Sturdevant
(A.C. Nielson Company), and many others (see History).
Language: Microsoft Macro Assembler (MASM)
Version: 2.30
Released: January 8, 1988
Documentation: Christine Gianone, Frank da Cruz (Columbia University),
Joe R. Doupnik (Utah State University)
Dedicated To: Peppi
Kermit-MS Capabilities At A Glance:
Local operation: Yes
Remote operation: Yes
Transfers text files: Yes
Transfers binary files: Yes
Wildcard send: Yes
File transfer interruption: Yes
Filename collision avoidance: Yes
Can time out: Yes
8th-bit prefixing: Yes
Repeat count compression: Yes
Alternate block check types: Yes
Terminal emulation: VT102, H19, VT52, Tektronix 4010
Communication settings: Speed, Parity, Flow Control, Handshake, Echo
Transmit BREAK: Yes (and Long BREAK)
IBM mainframe communication: Yes
Transaction logging: No
Session logging (raw download): Yes
Raw upload: Yes
Act as server: Yes
Talk to server: Yes
Advanced server functions: Yes
Advanced commands for servers: Yes
Local file management: Yes
Command/init files: Yes
Command macros: Yes
Extended-length packets: Yes
Local area networks: Yes (NetBIOS support)
MS-Windows compatibility: Yes
Attribute packets: No
Sliding windows: No
MS-DOS Kermit, or "Kermit-MS" (or MS-Kermit), is a program that implements the
Kermit file transfer protocol for the entire IBM PC family, including the PS/2
series, IBM compatibles, and several other machines based on the Intel 8086
processor series (8088, 80286, 80386, etc) and the DOS operating system family
(PC-DOS or MS-DOS, henceforth referred to collectively as MS-DOS or simply
DOS).
It is assumed you are acquainted with your PC and with DOS, and that you are
familiar with the general ideas of data communication and Kermit file transfer.
A very brief overview is given here, but for details consult the early chapters
of the Kermit User Guide (of which this document is a chapter), or the book
Kermit, A File Transfer Protocol, by Frank da Cruz, Digital Press (1987), order
number EY-6705E-DP (phone 1-800-343-8321), which also includes background
tutorials on computers, file systems, and data communication (including modems,
cabling, etc). For further information about Kermit documentation, updates,
lists of current available versions, and ordering information, write to:
Kermit Distribution
Columbia University Center for Computing Activities
612 West 115th Street
New York, NY 10025 (USA)
1.1. System Requirements
Kermit-MS version 2.30 runs in as little as 70K of memory (about 55K
contiguous), but will occupy up to 120K, if it can be found, for extra screen
rollback memory. Versions not using screen rollback memory will not require
the additional space. It will also try to leave 24 Kbytes free for a second
copy of COMMAND.COM which is needed for execution of certain commands.
On the IBM PC family, Kermit-MS 2.30 performs almost complete emulation of the
DEC VT-102 and Heath/Zenith-19 terminals at speeds up to 19,200 baud or
greater, lacking only the VT102's smooth scrolling and (on some display boards)
132 column features. And as of version 2.30, Kermit-MS also performs Tektronix
4010 graphics terminal emulation on IBM PC family systems equipped with CGA,
EGA, and Hercules graphics adapters, with either color or monochrome monitors.
Much of Kermit's speed is accomplished by direct writes to screen memory, but
this is done in a "TopView-aware" manner to allow successful operation in win-
dowing environments like MS-Windows, DesqView, and TopView itself. Speed is
also due to direct access of the serial port 8250 UART (Universal Asynchronous
Receiver/Transmitter) chip, with buffered, interrupt-driven receipt of charac-
ters and selectable XON/XOFF flow control. Full speed 9600 baud operation is
possible on 4.77Mhz systems without flow control, but flow control is required
on these systems for 19,200 baud or higher rates. The IBM PC version should
also run on near-clones like the DG/1 that differ from true PCs only in their
choice of UART; non-8250 UARTs are detected automatically, and slower
non-interrupt driven Bios serial port i/o is used, in which case the top speed
is in the 1200 baud range. On the IBM PC family, COM1 and COM2 are supported,
and "hooks" are available for (inevitably nonstandard) COM3 and COM4 options.
Kermit-MS 2.30 runs on the entire IBM PC family (the PC, XT, AT, PCjr, Portable
PC, PC Convertible, PS/2) and compatibles (Compaq, VAXmate, Z150, etc), and
there are also specially tailored versions for non-IBM-compatibles like the DEC
Rainbow, NEC APC, Sanyo MBC, Victor 9000, HP-110, HP-150, HP Portable Plus, and
others, plus a "generic DOS" version that should run (slowly) on any 8086-based
MS-DOS machine. This document concentrates on the IBM version; some of the
system-dependent capabilities described here may be lacking in the non-IBM ver-
sions. See section 1.9 for features of different systems.
KERMIT.EXE for the IBM PC family occupies about 86K of disk storage (the figure
will vary for other versions). This can be reduced by about 15K if you run it
through EXEPACK. MS-Kermit is not distributed in packed form, because problems
have been reported on certain systems when this is done. So if you decide to
pack it, make sure to keep an unpacked version available to fall back to in
case of problems.
1.2. History
Over the years, MS-Kermit has grown from a Kermit file transfer program that
embodied a simple terminal emulator into a complex and powerful communication
program that includes the Kermit file transfer protocol. As a result, the bulk
of this manual is devoted to the communication features, rather than Kermit
protocol operation. Skip ahead to the next section if you're not interested in
the history of MS-Kermit.
MS-DOS Kermit (like the Kermit file transfer protocol itself) is a product of
the Systems Group of the Columbia University Center for Computing Activities,
and it was one of the four original Kermit programs (with the CP/M, DEC-20, and
IBM mainframe versions). It was initially written for the IBM PC with DOS 1.1
by Daphne Tzoar in 1981-1982, based largely on Bill Catchings's original CP/M
8080 assembler version. PC-Kermit (as it was called then) provided basic Ker-
mit file transfer and VT52 emulation. Joellen Windsor of the University of
Arizona added conditional assembly support for the Heath/Zenith-100 shortly
thereafter, and soon after that Dave King of Carnegie-Mellon University added
Heath-19 terminal emulation, and some patches to let the program run under the
new DOS version, 2.0. During this era, the program version numbers went from
1.0 to 1.20.
With the appearance in the marketplace of many new MS-DOS machines that were
not compatible with the IBM PC, it became apparent that conditionally assembled
code supporting each of these machines within a single monolithic source file
was not the best way to organize the program. Therefore Daphne, along with
Jeff Damens of Columbia, undertook to reorganize the program in a modular way,
isolating system dependencies into separate files. The result was version
2.26, released in July 1984. It included support for the DEC Rainbow, the
HP-150, the Wang PC, and generic MS-DOS, as well as for the IBM PC family and
the H/Z-100. It also included many new features, like 8th-bit prefixing (code
contributed by The Source Telecomputing), alternate block check selection,
byte-count compression, server/client operation, access to local file and DOS
operations, command macros, initialization and command files, screen rollback,
key redefinition, and more. For the 2.26 release, the executable Kermit
programs were encoded printably as ".BOO" files, designed by Bill Catchings as
part of this effort.
Release 2.27 was produced by Daphne and Jeff in December 1984. Unlike 2.26, it
ran correctly on the new PC/AT under DOS 3.0, and included support for the NEC
APC from Ron Blanford of Seattle, WA, and Ian Gibbons of the University of
Hawaii, and for the TI Professional from Joe Smith of the Colorado School of
Mines, plus some bug fixes and reorganization. 2.27 is the last version that
runs under pre-2.0 versions of DOS.
Version 2.28 (Daphne, Jeff, June 1985) added dynamic memory allocation to
reduce disk storage for the .EXE file, and to allow the program to adjust it-
self to the PC's memory size, plus the inevitable bug fixes (many of them con-
tributed by Edgar Butt of the University of Maryland and Gregg Small of the
University of California at Berkeley). During this period, support for ad-
ditional MS-DOS systems was added by various people.
In December 1985, a tape showed up at Columbia sent by Prof. Joe R. Doupnik of
the Center for Atmospheric and Space Studies and EE Department at Utah State
University. This tape contained version 2.28 modified to fully support the DOS
2.0 file system, and to which many new features had been added, notably the
ability of the MS-DOS Kermit server to process various REMOTE commands (DIR,
CWD, SPACE, etc). And at about the same time, a tape arrived from James Harvey
of Indiana/Purdue University, who had changed Kermit's CONNECT command to emu-
late the popular DEC VT100 terminal. This material was sent to Joe, who then
laboriously fitted James's work into his own code, keeping the VT52 and H19
emulation alive as options, and upgrading the VT100 emulation to VT102 by ad-
ding features such as line and character insertion and deletion. The result
was version 2.29, released in May 1986.
Soon after the release of 2.29, some disks were sent in by James Sturdevant of
the A.C. Nielson Company, containing a full implementation of the Kermit script
facility, as described in the Kermit book. This material was sent to Joe, who
had by now become keeper of MS-DOS Kermit and had already begun work on version
2.30 by adding support for extended-length packets. Joe had been carrying on
voluminous network correspondence (Thanks, BITNET!) with Columbia and with
MS-DOS Kermit users and testers all over the world, giving birth to many new
features, including Tektronix graphics terminal emulation, support for opera-
tion over local area networks, support for 8-bit ASCII terminal connections and
international character sets, ANSI printer control, and a redesigned, more
powerful, more portable key redefinition mechanism. Version 2.30 was formally
released on January 1, 1988, after many "alpha" and "beta" tests.
Among the many contributors to this version are: Brian Holley and Joe Smith for
the Tektronix emulation, Robert Goeke for the NEC AP3 support, Brian Peterson
and Andreas Stumpf for the Victor 9000, Bob Babcock and Joe White for the
Sanyos, Christopher Lent for the Wang PC, Jack Bryans for an Intel iRMX ver-
sion, Jim Noble for the Grid Compass, Geoff Mulligan and others for the Zenith
100, and David Knoell for the special Rainbow edition. And thanks to Gisbert
Selke, Jack Bryans, and others for proofreading drafts of this manual. And
apologies to anyone we neglected to mention.
Finally, please note that the program version number is not a whole number and
a fraction; 2.30 is pronounced "two point thirty", and is not equal to 2.3.
1.3. Using MS-Kermit
MS-DOS Kermit performs two major functions, terminal emulation and file trans-
fer. File transfer can be done using either the Kermit file transfer protocol,
or else (without error checking), ASCII or XON/XOFF capture and transmission
methods. To use Kermit for "raw" uploading or downloading of files, see the
descriptions of the LOG SESSION and TRANSMIT commands.
Before you can transfer files with another system using Kermit protocol, you
must first connect to it as a terminal, login if necessary, and start up a Ker-
mit program there. The following example shows this process; the other com-
puter is a Unix system, but the method is the same with most others. The parts
you type are underlined (if this document was printed on a printer that can
underline), and when you type a command, you terminate it with a carriage
return, which you can't see in the example. The mysterious "^]c" is
MS-Kermit's "escape sequence", which you enter by holding down the Control
(Ctrl) key and pressing "]" (right square bracket), and then typing the letter
C. The example assumes the MS-Kermit program is stored on disk as KERMIT.EXE.
Program Dialog: Explanation:
A>kermit
IBM PC Kermit-MS V2.30 8 Jan 88
Type ? for help
Kermit-MS>set speed 1200 Set the right baud rate.
Kermit-MS>connect Connect as a terminal.
(Connecting to host, type ^]C to return to PC.)
ATDT7654321 Dial the modem if necessary.
CONNECT 1200 The modem tells you you're connected.
Now you're talking to the Unix system.
Type a carriage return to get its attention.
Login: christin Login to the host.
password: (Passwords normally don't echo.)
% kermit Run Kermit on the host.
C-Kermit>receive Tell it to receive a file.
^]c Escape back to the PC.
Kermit-MS>send autoexec.bat Send a file.
(The file is transferred...)
Kermit-MS> Transfer complete, prompt reappears.
In this example, the user types "kermit", and sees the program's herald and its
prompt, "Kermit-MS>". Then she sets the appropriate communication speed ("baud
rate"), connects as a terminal, issues a dialing command to a Hayes-like modem
(you would skip this step if you had a direct connection), logs in to her ID on
the Unix system which she has dialed, starts "C-Kermit" on the Unix system,
tells it to receive a file, escapes back to the PC, and tells MS-Kermit to send
a file. After the file is transferred, the user would normally connect back to
the Unix system, exit from the Kermit program there, and log out:
Kermit-MS>connect Connect again.
(Connecting to host, type ^]C to return.)
C-Kermit>exit
% ^D Logout from Unix by typing Ctrl-D.
^]c Escape back to the PC.
Kermit-MS>exit Return to DOS.
To transfer a file in the other direction, simply exchange the "send" and
"receive" commands above. That's the easiest and quickest way to use Kermit.
If this simple scenario does not work for you, issue the MS-Kermit STATUS com-
mand and look for any obvious incorrect settings (speed, parity), fix them with
SET commands, and try again. (IBM mainframe linemode connections have so many
"different" settings, there's a special command for them, "do ibm", which you
would type as the first Kermit-MS command above.) If that doesn't help, read
on. Many problems can crop up when you attempt to connect two unlike systems
over a possibly hostile communication medium. And if you intend to be a fre-
quent user of Kermit, there are many options you can take advantage of to adapt
MS-Kermit to different systems, improve its performance, and automate common
tasks.
1.4. The MS-DOS File System
The features of the MS-DOS file system of greatest interest to Kermit users are
the form of the file specifications, and the formats of the files themselves.
1.4.1. File Specifications
MS-DOS file specifications (in version 2.0 or later of DOS) are of the form
DEVICE:\PATHNAME\NAME.TYPE
where the DEVICE is a single character identifier (for instance, A for the
first floppy disk, C for the first fixed disk, D for a RAM disk emulator) fol-
lowed by a colon (":"), PATHNAME is up to 63 characters of identifier(s) (up to
8 characters each) surrounded by backslashes ("\"), NAME is an identifier of up
to 8 characters, and TYPE is an identifier of up to 3 characters in length.
Device and pathname may be omitted. The first backslash in the pathname may be
omitted if the specified path is relative to the current directory. In the
path field, "." means the current directory, ".." means the parent directory.
Some DOS implementations (like Wang) may use slash ("/") rather than backslash
as a directory separator.
Pathname is normally omitted, but can be specified in all Kermit-MS commands
(as of version 2.29). Device and directory pathnames, when omitted, default to
either the user's current disk and directory, or to the current directory
search path as specified in the DOS PATH environment variable, depending on the
context in which the file name appears.
When this document says that a file is searched for "in the current
path," it means that Kermit-MS looks on the current disk and directory
first, and if the file is not found, then the directories listed in the
PATH environment variable are searched. If the PATH environment vari-
able is empty, Kermit looks only at the current disk and directory.
NAME.TYPE is sufficient to specify a file on the current disk and directory,
and only this information is sent along by Kermit-MS with an outgoing file.
The device, path, name, and type fields may contain uppercase letters, digits,
and the special characters "-" (dash), "_" (underscore), "$" (dollar sign), "&"
(ampersand), "#" (number sign), "@" (at sign), "!" (exclamation mark), "'"
(single quote), "()" (parentheses), "{}" (curly braces), "^" (caret or
circumflex), "~" (tilde), and "`" (accent grave). Normally, you should confine
your filenames to letters and digits for maximum transportability to non-DOS
systems. When you type lowercase letters in filenames, they are converted
automatically to uppercase. There are no imbedded or trailing spaces. Other
characters may not be included; there is no mechanism for "quoting" otherwise
illegal characters in filenames. The fields of the file specification are set
off from one another by the punctuation indicated above.
The name field is the primary identifier for the file. The type, also called
the extension or suffix, is an indicator which, by convention, tells what kind
of file we have. For instance FOO.BAS is the source of a BASIC program named
FOO; FOO.OBJ might be the relocatable object module produced by compiling
FOO.BAS; FOO.EXE could be an executable program produced by loading FOO.OBJ,
and so forth. .EXE and .COM are the normal suffixes for executable programs.
MS-DOS allows a group of files to be specified in a single file specification
by including the special "wildcard" characters, "*" and "?". A "*" matches any
string of characters from the current position to the end of the field, includ-
ing no characters at all; a "?" matches any single character. Here are some
examples:
*.BAS All files of type BAS (BASIC source files) in the current directory.
FOO.* Files of all types with name FOO.
F*.* All files whose names start with F.
*.? All files whose types are exactly one character long, or have no type
at all.
Wildcard notation is used on many computer systems in similar ways, and it is
the mechanism most commonly used to instruct Kermit to send a group of files.
Users of Kermit-MS should bear in mind that other (non-MS-DOS) systems may use
different wildcard characters. For instance VMS and the DEC-20 use "%" instead
of "?" as the single character wildcard; when using Kermit-MS to request a
wildcard file group from a Kermit-20 server, the DOS "?" must be replaced by
the DEC-20 "%".
1.4.2. File Formats
MS-DOS systems store files as streams of 8-bit bytes, with no particular dis-
tinction among text, program code, and binary files. ASCII text files consist
of lines separated by carriage-return-linefeed sequences (CRLFs), and this con-
forms exactly to the way Kermit represents text files during transmission, so
Kermit-MS has no need for a SET FILE TYPE BINARY command. But since a non-
MS-DOS receiving system might need to make distinctions as to file type, you
will probably have to issue SET FILE TYPE commands there if you are sending it
non-text files. In transmitting files between Kermit-MS programs, regardless
of file contents, the receiving MS-DOS system is equally capable of processing
text, code, and data, and in fact requires no knowledge of how the bytes in the
file are to be used.
MS-DOS (unlike CP/M) knows the exact end of a file because it keeps a byte
count in the directory, so one would expect no particular confusion in this
regard. However, certain MS-DOS programs continue to use the CP/M convention
of terminating a text file with a Control-Z character, and won't operate cor-
rectly unless this terminating byte is present. Therefore, you should be aware
of a special SET EOF option for both incoming and outbound files, described
later.
Non-MS-DOS systems may be confused by nonstandard ASCII files sent by
Kermit-MS:
- Files containing any of the 8-bit "extended ASCII" characters may
need conversion (or translation) to 7-bit ASCII.
- Files produced by word processing programs like Word Perfect or Word
Star may contain special binary formatting codes, and could need con-
version to conventional 7-bit ASCII format prior to transmission,
using commonly available "exporter" programs.
- Files created by word processors that store formatting data at the
end of the file, after the Control-Z and before physical end, may re-
quire special processing via SET EOF to strip the formatting data,
lest they confuse non-MS-DOS recipients.
- Spreadsheet or database files usually need special formatting to be
meaningful to non-MS-DOS recipients (though they can be transmitted
between MS-DOS systems with Kermit-MS).
- BASIC programs are normally saved in a binary "tokenized" form. Use
BASIC's ",a" SAVE option to save them as regular ASCII text, as in
save"foofa",a
In general, when attempting to transfer non-text files between MS-DOS and a
different kind of system, consult the Kermit manual for that system.
1.5. Program Setup and Invocation
The MS-DOS Kermit program can be run from any disk without any special instal-
lation procedure. On hard disk systems, it is convenient to store the program
in one of the directories listed in your DOS PATH, and it is often desirable to
customize Kermit's operation to your communications and computing environment
by creating an initialization file.
Kermit-MS can be run interactively, from a batch file, or as an "external" DOS
command. Commands consist of one or more fields, separated by "whitespace" --
one or more spaces or tabs.
Upon initial startup, the program executes any commands found in the file
MSKERMIT.INI in the current path. This initialization file may contain command
macro definitions, communications settings for one or more ports, or any other
Kermit-MS commands, and you may create it using any text editor capable of
saving files in plain ASCII text format. Here is a sample:
comment -- MSKERMIT.INI, MS-DOS Kermit initialization file
comment -- Don't overwrite my files!
set warning on
comment -- Define macros for the systems I use...
define unix set local-echo off,set par non,set flow xon,set timer off
def ibm set par odd,set loc on,set hands xon,set flo none,set tim on
def modem set port 2, set baud 1200
comment -- Define a macro for quickly adapting to noisy connections...
def noisy set block-check 3, set send packet-length 40, set retry 20
comment -- I always start out by connecting to my UNIX system...
set port 1
set baud 4800
do unix
connect
A different file may be substituted for MSKERMIT.INI by using "-f filename" on
the DOS command line, e.g.
kermit -f monday.ini
The meanings of these commands will emerge below. For now, just note how you
can use command files (and "macro definitions") to easily adapt MS-Kermit to
widely differing communication environments. A more advanced initialization
file is shown below in section 1.8.
Interactive Operation:
To run Kermit-MS interactively, invoke the program from DOS command level by
typing its name, normally "kermit" (this means the program should be stored in
your path with the name KERMIT.EXE). When you see the program's prompt,
Kermit-MS>
you may type Kermit commands repeatedly until you are ready to exit the
program, as in the following example (which assumes there's already a Kermit
"server" set up on the other end):
A>
A>kermit
IBM PC Kermit-MS V2.30 8 Jan 88
Type ? for help
Kermit-MS>set speed 19200
Kermit-MS>send foo.*
The files are sent.
Kermit-MS>get fot.*
The requested files are received.
Kermit-MS>exit
A>
Interactive commands are described in Section 1.6.
Command Line Invocation:
Kermit-MS may be invoked with command line arguments from DOS command level,
for instance:
A>kermit send peter.amy
or
A>kermit set port 1, set baud 9600, connect
In this case, help and completion are not available (because the program that
provides them won't start running until after you type the entire command
line), and Kermit-MS will exit back to DOS after completing the specified com-
mand or commands. Therefore, when invoked with command line arguments,
Kermit-MS will behave as if it were an external DOS command, like MODE. Note
that several commands may be given on the command line, separated by commas.
This can't be done interactively or from TAKE command files.
As of version 2.30, two new Kermit commands can be given on the DOS command
line. First is the keyword STAY which prevents Kermit from exiting naturally
when the last command has completed (unless, of course, EXIT or QUIT was among
the commands). The second command is
-F filename
This means use the indicated filename as the initialization file rather than
MSKERMIT.INI. The path will be searched for this file, if necessary. A space
or tab must separate -F from the filename, and the F may be in upper or lower
case. Example:
kermit -f tuesday.ini, set port 2, do ibm, stay
You can run Kermit with no initialization file at all by using the command
kermit -f nul
If -F is the only command line option, STAY is implied.
Batch Operation:
Like other MS-DOS programs, Kermit-MS may be operated under batch with command
line arguments. If you invoke it without command line arguments, it will run
interactively, reading commands from the keyboard and not the batch file. When
it exits, batch processing will continue to the end of the batch file.
Kermit-MS returns the "errorlevel" parameter used as program exit status.
Present values are in the range 0 to 7 with three areas yielding success or
failure reports for the entire Kermit session. The errorlevel values are:
errorlevel Kermit session status
0 entirely successful operation
1 a Send command completed unsuccessfully
2 a Receive or GET command completed unsuccessfully
4 a REMOTE command completed unsuccessfully
3,5,6,7 combinations (addition) of the above conditions
Note that failures are remembered for the whole session and are not canceled by
a following successful operation of the same type. Thus, sending several files
individually yields an errorlevel of 0 only if all the files were sent success-
fully. The "errorlevel" parameter also applies to script commands where OUTPUT
corresponds to SEND and INPUT to RECEIVE. An example of Batch invocation of
Kermit is shown in Figure 1-3.
Remote Operation:
The MS-DOS CTTY command allows an MS-DOS system to be used from a terminal con-
nected to its communication port. Such sessions must be conducted with great
care, since many programs assume that they are running on the real console, and
explicitly reference screen memory or keyboard scan codes. Kermit can be used
in this manner too, but before you give it any file transfer commands, you must
inform it that it is running in "remote mode" rather than its normal "local
mode." Use the SET REMOTE ON command for this purpose, to prevent the file
transfer display from being sent out the port.
RAM Disk Operation:
If you invoke Kermit frequently, and you have sufficient memory on your PC, you
may find it convenient to copy Kermit and its initialization file to a RAM disk
when you start your system. This allows Kermit to be started and used quickly
and silently, with no disk operations.
For instance, if you're using IBM's VDISK facility to create the RAM disk, you
might put statements like this in your CONFIG.SYS file:
DEVICE=VDISK.SYS 512 512 32 /e
This assumes you have 512K of extended (/e) memory installed and VDISK.SYS is
in the root directory of the boot disk. It creates a 512K RAM disk with 512K
sector size and space for 32 directories in the extended memory, assigning it
the disk letter of your first unused disk. And then in your AUTOEXEC.BAT file
(assuming the RAM disk is disk D:)...
COPY KERMIT.EXE D: >NUL
COPY MSKERMIT.INI D: >NUL
COPY COMMAND.COM D: >NUL
SET COMSPEC=D:\COMMAND.COM
PATH D:\; ...
APPEND D:\; ...
The PATH and APPEND commands allow DOS to find KERMIT.EXE, and Kermit to find
MSKERMIT.INI and COMMAND.COM, on the RAM disk. If you use Kermit transfer
files to your RAM disk, remember to copy those files to a real disk before you
turn off the system.
Use of MS-Kermit in Windowing Environments:
Kermit-MS can operate within windowing environments like such as TopView,
DESqview, and MS-Windows. It runs in an active window under MS-Windows, ac-
cepts cut and paste material, talks with mice, and shrinks to an icon (a boxed
"KER"). An MS-Windows .PIF file can be constructed for Kermit using the
PIFEDIT program, supplied with Windows. Memory requirements should be listed
as 90 to 128KB. It should be noted that Kermit does not modify the screen,
keyboard, memory, COM1, or COM2 (!). Program switch and exchange should be
marked as Text, and Close Window on Exit should be checked. This configuration
will let you run Kermit with all the Windows features, but very slowly. To run
at full speed under Windows, tell PIFEDIT that Kermit modifies the screen.
Then you lose the Windows features (cutting, pasting, running the clock at the
same time, etc), but you still get back to the Windows interface when you EXIT
Kermit.
Local Area Network Operation:
MS-Kermit 2.30 is capable of using a serial port on another local area network
(LAN) node, so long as that node is running an asynchronous communication serv-
er and you have installed a device driver on your own PC that makes COM1 or
COM2 i/o use the network server. This type of connection works because
MS-Kermit 2.30 (but not earlier releases) on IBM PCs checks the selected port,
COM1 or COM2, to see if it's a real 8250 UART chip, and if it isn't, Kermit
uses only Bios calls for port i/o, and the network routes these through your
network device driver. It may be necessary to turn off a real COM1 or COM2
device (with a switch or jumper on the board) to convince Kermit to use the
Bios. This style of operation should be transparent to Kermit, except that not
all asynchronous communications servers utilize this technique.
As of version 2.30, the IBM PC version of Kermit can also communicate directly
with another PC on a local area network through the IBM NetBIOS emulator dis-
tributed with the LAN. In essence, the LAN substitutes for the serial port,
modem, and other wiring. Kermit running on one user machine can transfer files
with another Kermit also on the network much as if they were connected by
modems, and Kermit can talk with some larger machines the same way. The impor-
tant, and only, network command is
SET PORT NET nodename
which is described in the section on SET commands. Also see the SERVER command
description, and (if you're interested) section 1.16.1 for a technical descrip-
tion.
Kermit can even communicate with some other computers, such as Unix systems,
which accept logins via this remote pathway. The initial startup is the same
as calling a mainframe and logging in except the command SET PORT NET nodename
is used instead of SET PORT COM1. A connection is established with the first
use of the communications circuit, such as CONNECT, REMOTE DIR, SEND, or other
file transfer command, and terminated with the HANGUP command.
1.6. Kermit-MS Commands
MS-DOS Kermit supplies most of the commands and features of "ideal" Kermit.
Here's a summary:
-F specify alternate init file name on DOS command line.
BYE to remote server, exit from MS-Kermit.
CLEAR serial port buffer.
CLOSE log files and stop logging remote session.
COMMENT For including comments in command files.
CONNECT as terminal to remote system.
CWD change local working directory.
DEFINE a macro of Kermit-MS commands.
DELETE local files.
DIRECTORY listing of local files.
DISABLE server recognition of selected commands.
DO a command macro.
ECHO a line of text on the screen.
ENABLE server recognition of selected commands.
EXIT from Kermit-MS.
FINISH Shut down remote server.
GET remote files from server.
HANGUP the phone or network connection.
HELP about Kermit-MS.
INPUT specified string from serial port, for scripts.
LOG remote terminal session and/or packets.
LOGOUT remote server, don't exit from Kermit-MS.
OUTPUT string out serial port, for scripts.
PAUSE between commands.
PUSH to MS-DOS command level.
QUIT from Kermit-MS (same as EXIT).
RECEIVE files from remote Kermit.
REMOTE Prefix for remote file management commands.
RUN an MS-DOS program or command.
SEND files to remote Kermit.
SERVER mode of remote operation.
SET various parameters.
SHOW various parameters.
SPACE inquiry (about disk space).
STATUS inquiry (about settings).
STAY stay within Kermit after DOS command line invocation.
TAKE commands from a file.
TRANSMIT a file "raw" (no error checking).
TYPE a local file on the screen.
VERSION display Kermit-MS program version number.
Not all of these commands are necessarily available on all MS-DOS systems, and
some of the commands may work somewhat differently between DOS versions.
A command keyword, such as SEND, RECEIVE, HELP, etc, may be abbreviated, so
long as you have typed enough letters to distinguish it from other keywords
that are valid in that position. For instance, you can type CLE for CLEAR and
CLO for CLOSE. Several common commands also have special non-unique abbrevia-
tions, like C for CONNECT, S for SEND, and R for RECEIVE.
During interactive operation, you may edit the command you're currently typing
using BACKSPACE to erase the character most recently typed, Ctrl-W to delete
the most recent field, or Ctrl-U to delete the entire command. The editing
characters may be used in any combination until the command is finally entered
by typing RETURN (Carriage Return, Enter) or Ctrl-L.
You may use the help ("?") and keyword completion (ESC) features freely while
typing Kermit-MS commands. A question mark typed at almost any point in a com-
mand produces a brief description, or "menu", of what is expected or possible
at that point. ESC typed at any point, except in a local filename, will cause
the current field to be filled out if what you have typed so far is sufficient
to identify it, and will leave you in position to type the next field (or to
type a "?" to find out what the next field is); otherwise, the program will
beep at you and wait for you to type more characters.
Kermit-MS recognizes only 7-bit ASCII characters when examining a Kermit com-
mand line. The SET KEY and SHOW KEY commands can prompt for keyboard input and
understand 8-bit characters but only at their interactive prompt. The SET KEY,
INPUT, and OUTPUT commands accept "backslash number format" on the main Kermit
command line. Thus, national characters which are full 8-bit codes can be ex-
pressed on command lines in backslash number form (\ddd), provided the Kermit
command itself can understand the form. Presently, INPUT, OUTPUT, ECHO, SET
KEY, SET PROMPT, and DEFINE commands understand this notation. To enter
characters in backslash number format, type a backslash ("\") followed by a
number corresponding to the ASCII code for the character:
\123 a decimal number (decimal is the default number base)
\d249 a decimal number (also \D)
\o177 an octal (base 8) number (also \O)
\x0d a hexadecimal (base 16) number (also \X)
Table 1-1 shows all of the 7-bit ASCII codes in decimal. Most Kermit commands
understand backslash-ASCII codes, both imbedded within character strings, and
alone, as when a single character or number is to be specified.
Some Kermit-MS commands like GET, SHOW KEY, and SET KEY, may prompt for ad-
ditional information on subsequent lines. If you have reached one of these
prompts and then wish to cancel the command, you may type Control-C to get back
to the main Kermit-MS> prompt.
Summary of Kermit-MS command editing characters:
SPACE Separates fields within the command.
TAB Same as Space, and echoes as Space. You may also use Ctrl-I for
Tab.
BACKSPACE
Deletes the character most recently typed. May be typed repeatedly
to delete all the way back to the prompt. You may also use DELETE,
RUBOUT, Ctrl-H, or equivalent keys.
Ctrl-W Deletes the most recent "word", or field, on the command line. May
be typed repeatedly.
Ctrl-U Deletes the entire command line, back to the prompt.
Ctrl-C Cancels the current command and returns to the "Kermit-MS>" prompt.
Also, terminates execution of a TAKE command file.
ESC If enough characters have been supplied in the current keyword to
identify it uniquely the remainder of the field is supplied and the
cursor is positioned to the next field of the command. Otherwise,
a beep is sounded. ESC does not provide filename completion in
version 2.30.
? Displays a brief message describing what may be typed in the cur-
rent command field. Also, wildcard character for matching any
single character in all but the first position of a filename.
# Wildcard character for matching single characters in filenames.
-------------------------------------------------------------------------------
Dec Name Ctrl Dec Char Dec Char Dec Char
0 NUL ^@ | 32 SP | 64 @ | 96 `
1 SOH ^A | 33 ! | 65 A | 97 a
2 STX ^B | 34 " | 66 B | 98 b
3 ETX ^C | 35 # | 67 C | 99 c
4 EOT ^D | 36 $ | 68 D | 100 d
5 ENQ ^E | 37 % | 69 E | 101 e
6 ACK ^F | 38 & | 70 F | 102 f
7 BEL ^G beep | 39 ' | 71 G | 103 g
8 BS ^H backspace | 40 ( | 72 H | 104 h
9 HT ^I tab | 41 ) | 73 I | 105 i
10 LF ^J linefeed | 42 * | 74 J | 106 j
11 VT ^K | 43 + | 75 K | 107 k
12 FF ^L formfeed | 44 , | 76 L | 108 l
13 CR ^M return | 45 - | 77 M | 109 m
14 SO ^N shift out | 46 . | 78 N | 110 n
15 SI ^O shift in | 47 / | 79 O | 111 o
16 DLE ^P | 48 0 | 80 P | 112 p
17 DC1 ^Q XON | 49 1 | 81 Q | 113 q
18 DC2 ^R | 50 2 | 82 R | 114 r
19 DC3 ^S XOFF | 51 3 | 83 S | 115 s
20 DC4 ^T | 52 4 | 84 T | 116 t
21 NAK ^U | 53 5 | 85 U | 117 u
23 ETB ^W | 54 6 | 86 V | 118 v
22 SYN ^V | 55 7 | 87 W | 119 w
24 CAN ^X | 56 8 | 88 X | 120 x
25 EM ^Y | 57 9 | 89 Y | 121 y
26 SUB ^Z | 58 : | 90 Z | 122 z
27 ESC ^[ escape | 59 ; | 91 [ | 123 {
28 FS ^\ | 60 < | 92 \ | 124 |
29 GS ^] | 61 = | 93 ] | 125 }
30 RS ^^ | 62 > | 94 ^ | 126 ~
31 US ^_ | 63 ? | 95 _ | 127 RUBOUT,DELETE
Table 1-1: The US ASCII Character Set (ANSI X3.4-1977)
-------------------------------------------------------------------------------
Equivalent to MS-DOS "?", but used in the first position of a
filename only, so that "?" may be used to get help at the beginning
of a filename field.
RETURN Enters the command. On most keyboards, you may also use ENTER or
Ctrl-M.
Ctrl-L Clears the screen and enters the command.
Liberal use of "?" allows you to feel your way through the commands and their
fields. This feature is sometimes called "menu on demand" or "context sen-
sitive help" -- unlike systems that force you to negotiate menus at every turn,
menu-on-demand provides help only when it is needed.
Command parsing is done through DOS calls. Kermit key redefinition does not
apply at MS-Kermit command level. But ANSI.SYS or other external console
drivers can be used for this purpose, for instance to assign ESC to the PC's
backquote key (ANSI.SYS is the IBM-supplied extended screen and keyboard device
driver, described in the IBM DOS Technical Reference Manual). Other console
drivers available include ProKey, SuperKey, NANSI.SYS (a public-domain replace-
ment for ANSI.SYS), and FANSICONSOLE.
The notation used in command descriptions is as follows: Optional fields are in
[square brackets], lists of alternatives are in {curly braces}, separated by
commas. Parameters, such as numbers or filenames, are shown in italics
(providing the printer is capable of printing italics), and in dialog examples
user typein is underlined (on printers that can show it) to distinguish it from
computer typeout.
The following sections describe MS-Kermit's commands. Command descriptions may
contain references to other commands that haven't been explained yet. You
might find that this manual makes more sense on a second reading.
1.6.1. Program Management Commands
"Program management" is a rubric for Kermit-MS commands like TAKE, EXIT, HELP,
COMMENT, ECHO, and VERSION, that don't fall into any other category.
HELP simply displays a short help message (the same one, in fact, that you
would see if you typed a question mark in the same place).
VERSION displays the MS-Kermit program version number, which you should know in
case you are reporting bugs or seeking technical assistance.
Other program management commands require a bit more explanation.
The EXIT Command
Syntax: EXIT or QUIT
EXIT and QUIT are synonyms for each other. They cause MS-Kermit to return con-
trol to DOS or whatever program invoked MS-Kermit. The specific actions taken
are:
- Close any open log or other files.
- Close any open network connection.
- Release all memory claimed by the program.
- Disable interrupts for the currently selected communication device.
- Terminate execution.
The serial port RS-232 signals are left alone upon EXIT, so that modem connec-
tions are not broken. Kermit-MS may be restarted with the connection intact.
Use HANGUP to explicitly break a modem connection.
The STAY Command
Syntax: STAY
The STAY command, if included among command line arguments, instructs MS-Kermit
not to exit upon completion but rather to enter interactive mode, unless EXIT
or QUIT was among the command arguments. STAY has no effect when entered in-
teractively or from a TAKE file.
The PUSH Command
Syntax: PUSH
PUSH is similar to EXIT, except it leaves MS-Kermit intact by invoking an
MS-DOS command processor "under" Kermit-MS, either COMMAND.COM or whatever
shell you have specified with COMSPEC (or SHELL, depending on the system) in
your CONFIG.SYS file. You can return to Kermit-MS by typing the MS-DOS EXIT
command, and you will find Kermit-MS as you left it, with all settings intact.
The same function is invoked by the CONNECT escape-level command P. Example:
Kermit-MS>push Push to DOS.
Command v3.10 COMMAND.COM program herald.
C>diskcopy a: b: Run a DOS program.
DISKCOPY dialog here...
C>dir b: More DOS commands...
DOS session continues...
C>exit When done, type DOS EXIT command.
Kermit-MS> Back at Kermit.
The TAKE Command
Syntax: TAKE filespec
The TAKE command gives you way a to collect MS-Kermit commands into a single
file, so that you can execute many commands by typing a single (TAKE) command.
TAKE instructs MS-Kermit to execute commands from the file that you specify.
The current directory is searched for the file first, and then any directories
listed in the PATH environment variable. The command file may include any
valid Kermit-MS commands, including TAKE, but it cannot include characters to
be sent to a remote host after a CONNECT command (use scripts for that,
described below). Execution of a TAKE file may be cancelled by typing
Control-C at the keyboard.
An implicit TAKE command is executed upon the initialization file, MSKERMIT.INI
(or another file specified in the "-f" command-line argument), whenever you
start MS-Kermit. The MSKERMIT.INI file contains any commands you want to be
executed each time you run Kermit. A sample is shown above, and a more am-
bitious example is shown in section 1.8.
Commands within TAKE files, unlike interactive commands, may include trailing
comments, preceded by semicolons (if a real semicolon is needed in a command,
express it as "\;" and it will not be mistaken for the start of a comment).
set port 2 ; Select the modem port.
set speed 1200 ; Set the baud rate for the modem.
connect ; Conduct a terminal session.
hangup ; Hang up the phone after escaping back.
Note the HANGUP command after CONNECT. The HANGUP command is not executed un-
til after you escape back from your CONNECT session. If this file were called
MODEM.CMD, the following TAKE command would execute it:
Kermit-MS>take modem.cmd
This directs MS-Kermit to find the MODEM.CMD file, open it, execute the com-
mands in it, close it, and return to the MS-Kermit> prompt when done. This
process can take a while on floppy-disk based systems.
Commands from the TAKE file will normally not be displayed on your screen
during execution. If you want to see them as they are executing, you can SET
TAKE-ECHO ON (for instance, at the beginning or end of your MSKERMIT.INI file).
With the echoing ON, comments are also displayed for reference, but the semi-
colon is not shown.
TAKE files may be nested to any reasonable level. A command file that was in-
voked by another command file returns to its invoking command file, rather than
to the MS-Kermit> prompt.
There is currently no parameter substitution mechanism for TAKE files.
Warnings:
- An explicit query mark ("?") in a TAKE file will cause a help message
to be displayed and the rest of the line will be read as another com-
mand.
- Since TAKE file processing discards all characters from a line begin-
ning with the first semicolon, it is normally not possible to include
semicolons as part of the commands themselves, e.g.
get dska:foo.bar;6
To get around this restriction, you may precede such semicolons with
a backslash:
get dska:foo.bar\;6
The -F Command
Syntax: -F filespec
The "-f" command is effective only on the DOS command line. It instructs
MS-Kermit to use the specified file as its initialization file, rather than
MSKERMIT.INI. Unlike other command-line arguments, "-f" does not, of itself,
cause MS-Kermit to exit upon completion. Example:
C>kermit -f sunday.ini
Kermit-MS>
The -F command line option allows different MS-Kermit initialization files to
coexist. You can create batch commands to invoke Kermit in different ways, for
instance MONDAY.BAT might contain "kermit -f monday.ini", TUESDAY.BAT "kermit
-f tuesday.ini", etc.
The ECHO Command
Syntax: ECHO [string]
The ECHO command writes the string to the screen, without adding a carriage
return or line feed. ECHO may be used to report progress during execution of a
TAKE command file, or to issue prompts during the execution of a script.
ECHO Part one completed...\13\10
The numbers at the end are "backslash codes" for ASCII control characters, in
this case carriage return (\13) and linefeed (\10). Since the ECHO command in-
terprets backslash codes, ANSI.SYS and similar console drivers can be
programmed through this command by embedding ANSI escape sequences (see section
1.15.3) in the echo string.
The COMMENT Command
Syntax: COMMENT text
The COMMENT command lets you add comments to a TAKE command file. The word
COMMENT (or any unique prefix thereof) must appear as the first word on the
line. The COMMENT command may also be entered interactively. It has no effect
at all. Comments may also be entered in TAKE files, but not on interactive
command lines, by using the semicolon (";") character. Unlike the COMMENT com-
mand, semicolon comments may appear on the same line as a Kermit command. Ex-
ample:
COMMENT - MS-Kermit command file to connect port 2 to an IBM mainframe
set port 2
set speed 4800 ; Baud rate is 4800
do ibm ; Set parameters for IBM linemode
connect ; Be a terminal
Question marks should not be included in comments, as they will invoke the help
function.
The DEFINE Command
Syntax: DEFINE macro-name [command [, command [, ...]]]
Command macros provide another way of collecting many commands into a single
command. The difference between a macro and a TAKE file is that Kermit keeps
all its macro definitions in memory, and can execute them as many times as you
like, without having to look them up on disk, whereas every time you issue a
TAKE command, Kermit has to access a disk. But... you can have as many TAKE
command files as you like, and they can be as long as you want, whereas
MS-Kermit's memory for storing macro definitions is limited. You can put macro
definitions and DO commands for them in TAKE files (or for that matter, you can
put TAKE commands in macro definitions).
Kermit-MS command macros are constructed with the DEFINE command. Any
Kermit-MS commands may be included. Example:
define telenet set parity mark, set baud 1200, connect
A macro can be undefined by typing an empty DEFINE command for it, like
define telenet
A macro definition may be no longer than 128 characters. Longer definitions
can be accomplished by "chaining." Example:
define setup set port 1, set speed 19200, set par even, do setup2
define setup2 set flo no, set handsh xon, set local on, do setup3
define setup3 set timer on, set terminal color 1 31 45, do setup4
define setup4 set warning on, set incomplete keep, connect
DO SETUP will invoke all of these commands. The commas above stand for the
carriage returns needed by individual commands. Commas must be used to
separate commands in macro definitions; carriage returns (\13) cannot be used.
When control or other special characters are needed in a macro they may be ex-
pressed in backslash number form, \nnn.
The SHOW MACROS command displays the value of all currently defined macros, and
tells how much space is left for further definitions.
The DO Command
Syntax: DO macro-name
A Kermit-MS command macro is invoked using the DO command. For instance,
Kermit-MS comes with a predefined macro to allow convenient setup for IBM
mainframe line-mode communications; to invoke it, you would type DO IBM. The
IBM macro is defined as "set timer on, set local-echo on, set parity mark,
handshake xon, set flow none". You can use the DEFINE command to redefine this
macro or remove the definition altogether.
There is no automatic way to undo the effect of a macro. If you need to ac-
complish this effect, you should define another macro for that purpose. For
instance, to undo the effect of "do ibm" so that you could connect to, say, a
DEC VAX, you could:
def vax set par none,set hand none,set flo x,set tim off,set loc off
Then you can "do ibm" whenever you want to use the IBM system, and "do vax"
whenever you want to use the VAX.
If you wish to view the macro expansion whenever you issue a DO command, you
can SET TAKE-ECHO ON.
Local File Management Commands
These commands are executed on your local PC, and generally invoke DOS ser-
vices. This allows you to perform common DOS functions without leaving Kermit.
All file specifications may include device and/or directory fields. The local
file management commands are:
CWD path
Changes the current working directory to the given path. All
references to local file names without explicit paths will refer to
that path. A drive letter may be included to also change disk drives.
This command affects Kermit and any inferior programs that you RUN or
PUSH to, but your previous disk and directory are restored when you
exit from Kermit.
DELETE filespec
Deletes the specified file or files. As in DOS, the names of the
deleted files are not listed, only the message "file(s) deleted" or
"file(s) not found", and if you give the command "delete *.*",
Kermit-MS will prompt "Are you sure?" since DOS is doing the work.
DIRECTORY [filespec]
Lists the names, sizes, and creation dates of files that match the
given file specification. If no filespec is given, the command is
equivalent to DIR *.*. Normal DOS switches are effective.
SPACE Performs the MS-DOS CHKDSK function by running the CHKDSK program from
the current path. CHKDSK summarizes your disk and memory usage.
RUN command
Passes the command line to COMMAND.COM for execution. Any legal DOS
operation is permitted: running a program (perhaps with command line
arguments or i/o redirection), executing a DOS command, or executing a
batch file. The COMMAND.COM file should be in the current path. Ker-
mit is suspended while the command is executed and automatically
resumes afterward. You may even nest RUN KERMIT commands several times
if memory is available. The command will be executed directly by
COMMAND.COM so follow the rules of DOS. Example:
Kermit-MS>run more < kim.txt
TYPE filespec
Displays the specified local file on the screen. Automatic pause is
not available at the end of a page (but see above example for how to
accomplish this). On most systems, Ctrl-S can be typed to stop scroll-
ing and Ctrl-Q to continue scrolling.
1.6.2. COMMANDS FOR TERMINAL CONNECTION
The CONNECT command connects your PC as a terminal to the remote system so that
you may conduct a session there, and the HANGUP command may be used to discon-
nect your modem (if you have one) from the remote system. There is presently
no DIAL command; modems may be dialed "manually" during CONNECT or by using
scripts. Scripts are described in detail in subsequent sections.
For completeness, the descriptions below contain copious reference to the SET
commands, which let you modify all sorts of terminal and communication
parameters (the SET commands are described in a later section). MS-Kermit is
initially set up with the following parameters, so that you only need to issue
SET commands for those that need to be changed:
PORT 1 (in most cases, e.g. COM1 on the IBM PC family)
TERMINAL VT102(*) emulation (on the IBM PC family and DEC
Rainbow)
SPEED Whatever the serial card is currently set to.
PARITY None
FLOW-CONTROL XON/XOFF
HANDSHAKE None
LOCAL-ECHO Off
DISPLAY 7-bit characters
INPUT TRANSLATION Off
ESCAPE Control-Rightbracket
(*) The VT102 terminal is compatible with the VT100, but includes a few ad-
ditional functions.
The CONNECT Command
Syntax: CONNECT -or- C
The CONNECT command establishes an interactive terminal connection to the
remote system using the currently selected communications port (SET PORT COM1
or COM2) with all settings currently in effect for that port, emulating the
currently selected type of terminal.
During CONNECT, the characters you type are sent out the communication port,
and the characters that arrive at the port are displayed on the screen or in-
terpreted by the selected terminal emulator. If you SET LOCAL-ECHO ON,
MS-Kermit will also display the characters you type on the screen.
Before you issue the CONNECT command, be sure to set the correct communication
speed (SET SPEED) and any other necessary communication parameters (e.g. SET
PARITY, SET LOCAL-ECHO). If you have SET DEBUG ON, then (on certain systems,
particularly the IBM PC), terminal emulation will be disabled and received con-
trol characters will be displayed in special notation.
By default, 7-bit ASCII characters are displayed on the screen. If you SET
DISPLAY 8, then 8-bit characters will be used (useful for "national" character
sets). Character translation will be done according to any SET TRANSLATION IN-
PUT and SET KEY commands you have issued. In addition, characters that are
sent to the screen will also be recorded in a disk file or on a printer if you
have issued a LOG SESSION command.
To get back to the PC, type the escape character followed by the letter C (for
"Close connection"). On most MS-DOS systems the escape character is Ctrl-]
(Control-Rightbracket). That means, hold down the Ctrl key, press "]", and
then type the letter C.
Kermit-MS>connect Connect to remote system.
Conduct terminal session here...
^]c Escape back to PC.
Kermit-MS> Prompt reappears.
This is called "escaping back". You can use the SET ESCAPE command to change
the escape character to something besides "^]", or you can assign the escaping-
back operation to a single key or key combination with SET KEY (on the IBM PC
the default for this is Alt-X).
You can include the CONNECT command in a TAKE command file, but not "bare" text
to be sent to the remote system during CONNECT (use scripts for that, see Sec-
tion 1.7). When a TAKE file includes a CONNECT command, no further commands
will be executed from the file until after you escape back.
When you CONNECT, the program attempts to raise the DTR and RTS RS-232 signals,
and it takes no specific action to lower them unless you explicitly issue the
HANGUP command; thus you can EXIT from Kermit-MS and restart it without drop-
ping a dialup connection. While CONNECTed, you can communicate directly with
an autodialer or "smart modem" to control the communications line, hang it up,
and the like, for instance, by typing AT commands to a Hayes-like modem.
Kermit-MS>set speed 2400
Kermit-MS>connect
AT Now you're talking to the modem.
OK
ATDT8765432
RINGING
CONNECT 2400
Welcome to ... Now you're talking to the host computer.
Please login:
MS-Kermit makes no attempt to monitor the modem's Carrier Detect (CD) or Data
Set Ready (DSR) signals, and will take no notice if they drop. Thus it is not
possible to automatically terminate a session if the connection is broken.
However, you may query the status of these modem signals yourself using
Kermit's SHOW MODEM command.
When using Kermit to connect two PCs "back to back," SET LOCAL-ECHO ON so that
when you CONNECT to the other PC to send messages to its operator, you can see
what you are typing. Depending on the system, you may have to type a carriage
return and a linefeed (Control-J) at the end of each line in order to make the
display look right.
The HANGUP Command
On serial port connections, the HANGUP command attempts to momentarily lower
the modem signals DTR and RTS. It may be used to hang up the phone when dialed
up through a modem, or to get the attention of port contention units or ter-
minal concentrators that operate in this manner. On direct connections, it
will probably have no effect. On local area network connections, the network
session is fully terminated.
TERMINAL EMULATION
The IBM PC version of Kermit-MS emulates the DEC VT102 terminal by default, and
may also be instructed to emulate the DEC VT52, the Heath/Zenith-19, the
Tektronix 4010 graphics terminal, or no terminal at all, selectable with the
SET TERMINAL command. Emulation of each of these terminals is nearly complete.
VT102 emulation lacks only smooth scroll and 132 column mode (some EGA boards
allow it). Double-height, double-width characters are supported, but simulated
using ordinary characters.
The IBM PC's 40-column (large character) screen mode may be used during CONNECT
if you SET TERMINAL NONE (but you may also have to inform the remote host that
your screen width is 40). This can provide improved readability to visually
impaired persons, but at the expense of terminal emulation. To use 40-column
mode, enter the DOS command "MODE 40" (or CO40 or BW40).
On color monitors, the foreground and background colors may be set using SET
TERMINAL COLOR, and inverse/normal video display may also be selected, along
with many other terminal parameters. A complete list of the commands, default
key configurations, and escape sequences accepted by the IBM PC Kermit terminal
emulator is given in section 1.15.1. Non-IBM-compatible PCs have different
terminal emulation options. See section 1.9.
Escape-Level Commands
The escape character, normally Control-], is used to regain the attention of
Kermit-MS during CONNECT (you can change the escape character using SET
ESCAPE). When you type the escape character, Kermit-MS waits for you to follow
it with a single character command. For instance, the single character command
"?" produces a list of available single character commands. This command is
executed immediately; it may not be edited, and the program does not wait for a
carriage return to confirm it. Table 1-2 shows CONNECT escape-level commands
available in Kermit-MS.
-------------------------------------------------------------------------------
? Help -- Lists the available single-character commands.
0 (the digit zero) Transmit a NUL (ASCII 0).
B Transmit a BREAK signal.
L Transmit a Long BREAK signal (on some systems).
C Close the connection and return to Kermit-MS prompt level.
H Hangup the phone by lowering DTR and CTS momentarily.
F File the current screen in the screen dump file.
M Toggle the mode line, i.e. turn it off if it is on or vice versa.
P Push to DOS; get back to CONNECT by typing EXIT.
Q Temporarily quit logging the remote session.
R Resume logging the remote session.
S Show the status of the connection.
^] (or whatever you have set the escape character to be)
Typing the escape character twice sends one copy of it to the connected
host.
Table 1-2: Kermit Single-Character CONNECT Escape Commands
-------------------------------------------------------------------------------
Typing any other character (except the space bar, which is the "null command")
after the escape character will cause Kermit-MS to beep, but will do no harm.
These actions are also Kermit action verbs and can be assigned to single keys.
See SET KEY for details.
The Mode Line
When you first issue the CONNECT command, a message (on some systems, an in-
verse video "mode line") will display the most important facts about the con-
nection you've just established, so that you can quickly diagnose any problems.
Here's what the IBM PC mode line looks like:
Esc-chr:^] help:^]? port:1 speed:9600 parity:odd echo:rem VT102 .... PRN
This shows that the escape character is Ctrl-Rightbracket, that you would type
Ctrl-rightbracket followed by question mark ("^]?") to get help during CONNECT,
that you are connected on port 1 at 9600 baud with odd parity and remote echo,
and that a VT102 terminal is being emulated. The four dots represent the
VT102s LEDs (they turn into the digits 1,2,3,4 when "lit") and PRN will show up
if the printer is activated (e.g. by Ctrl-PrintScreen).
The mode line may be turned on and off using SET MODE, or the CONNECT escape
character followed by the letter M.
Screen Rollback
On the IBM PC and some other systems (see Table 1-5), Kermit-MS provides
several pages of screen memory which let you recall earlier terminal screens.
These may be scrolled up and down using keys as shown in Table 1-6. For in-
stance, the IBM PC uses PgUp (previous screen), PgDn (next screen), Ctrl-PgUp
and Ctrl-PgDn (one line at a time). Only lines that scroll off the top of the
screen are saved. When an application clears the screen, that screen is not
saved. These functions and others may be assigned to different keys with the
SET KEY command.
If you have rolled the screen back and a new character must be displayed, it
will normally appear at the current cursor position on the old screen. This is
useful when you are trying to copy something from a previous screen. If you
wish new characters to appear in their proper place on the "newest" screen, you
can SET TERMINAL ROLL ON.
Screen Dump
The screen dump feature writes the contents of the current screen to a file
(KERMIT.SCN unless another file was selected by the SET DUMP command) when the
CONNECT escape-level command F is typed. The screen dump file is appended to
on each successive screen dump, with each screen separated by a formfeed
(Ctrl-L). This feature may be used in conjunction with screen rollback -- a
handy way to recapture screenfuls of laboriously typed-in text after a remote
host has crashed without saving your work. The corresponding action verb is
"dump". Screen dump does not function when in Tektronix graphics mode; instead
one of many graphics screen capture programs may be used independently commonly
via the DOS Shift PrtSc key combination or by LOGging the incoming byte stream.
A screen dump differs from a session log in two ways. First, each desired
screen must be manually filed, and second, the screen dump file has been
stripped of any escape sequences, whereas the session log records them (see LOG
SESSION).
Printer Control
During terminal emulation, a locally attached printer may be controlled in the
normal manner, on most systems. Pushing the "Print Screen" key (shifted on
some systems) will cause the current contents of the screen to be printed by
DOS; holding down Ctrl while depressing Print Screen will alternately start and
stop the spooling of incoming characters to the printer. On the IBM PC, the
mode line will show PRN when the printer is activated in this manner. ^P or ^N
are sent to the host during terminal emulation and do not toggle printing as
they do when you're talking directly to DOS. CTRL-Print-Screen can be simu-
lated with the Kermit-MS LOG PRN and CLOSE commands. VT102 (ANSI) style
host-controlled transparent printing is also supported on the IBM PC. See sec-
tion 1.16.6 for technical information about MS-Kermit's printer control.
Graphics
MS-Kermit on the IBM PC, compatibles, and several other systems, is capable of
emulating a Tektronix 4010 graphics terminal, for use with host-based software
that can generate Tektronix control codes. When you enter Tektronix emulation,
your cursor will disappear. Don't be alarmed, this is how Tektronix terminals
behave.
The Tektronix emulator implements a mixture of Tek 4010 and 4014 features to
draw characters, lines, and dots in graphics mode. These Tektronix terminals
have a graphics display 780 dots high by 1024 dots wide. They use storage tube
technology whereby a dot stays illuminated until the full screen is erased.
They also lack cursor keys. Kermit's Tek emulator maps the 1024 by 780 dot
display to the PC's current screen dimensions, say 640 across by 200 or 350
dots high, and retains limited use of the cursor keys. It automatically senses
the active display adapter (EGA, CGA, Hercules, Mono, and AT&T/Olivetti
640x400) and retains screen coloring (EGA) and the current graphics image (EGA
and Hercules) if the adapter has sufficient memory. Pure monochrome systems,
of course, lack a graphics capability; in this case Kermit approximates the
graphic image by writing dots as plus signs.
Tektronix graphics mode is entered two different ways, automatically and volun-
tarily:
1. Automatically (which you can prevent via the Kermit command DISABLE
TEK). While emulating a VT102, VT52, or Heath-19, reception of the
byte pair ESCAPE Control-L causes the PC to change to graphics mode,
clear the screen, and obey new input as Tektronix commands. A
second automatic entry is reception of the escape sequence
"ESC [ ? 3 8 h" which does the same as above except the screen is
not cleared. Automatic mode is exited by either reception of
Control-X or "ESC [ ? 3 8 l" (lower case L), or by toggling the ter-
minal type (ALT minus, Kermit verb\KTermtype) to VT102, or something
other than TEK. (These "ESC [ ? 3 8 h/l" sequences derive from the
DEC VT340 terminal.)
2. Voluntary mode is when terminal type TEK4010 is selected by the Ker-
mit command SET TERMINAL TEK4010 or by toggling to it as above. It
is exited by SET TERMINAL another-kind or by toggling to another
kind. ENABLE or DISABLE TEK and the exit-Tek-mode escape sequences
are not applicable to voluntary mode.
Here are several common questions about Tek mode, and their answers:
1. "How do I escape from graphics mode back to being a regular
terminal?" Within CONNECT mode, you can type the \KTermtype key,
which is assigned by default to Alt-Minus. Repeated pressing of
this key "toggles" among Kermit's terminal types, VT102, VT52,
Heath-19, and Tektronix. You can also escape back to Kermit-MS com-
mand level and issue an explicit SET TERMINAL command to change the
terminal type.
2. "How can I return to the graphics screen without erasing it?" The
graphics screen is preserved if your graphics adapter has sufficient
memory (see Table 1-3). In this case, both your text and graphics
screens will be preserved when you toggle back and forth between a
character terminal (e.g. VT102) and Tektronix.
3. "How do I erase the graphics screen?" You can type the \KReset key,
which is normally assigned to Alt-=. The screen also clears if the
host sends a Control-L or ESC Control-L.
While acting as a Tek terminal Kermit uses the keyboard translation appropriate
to the VT102 terminal. However, received escape sequences are interpreted by
the Tek emulator and VT102 escape codes are inoperative. The Tek emulator ab-
sorbs the ESCAPE and following character and treats any additional unknown
items as ordinary text.
The emulator can display text characters from a built-in 8-by-8 dot font for
characters Space through DELete (no control codes nor special characters). A
backspace operation erases the character under the final cursor location (an
extension beyond a real Tektronix 4010). Tabs are converted to single spaces.
Only the low 7 bits of the character are used.
While in Tek mode the emulator behaves as a simple TTY device for ordinary text
and as a line or dot drawing Tektronix device for commands listed in Table 1-8.
The screen resolution is governed by the kind of active display adapter and
monitor in the PC (Table 1-3). Kermit senses this automatically when graphics
mode is entered. Graphics are saved on page 1 of screen memory. Coloring is
determined by the current terminal status, either the default screen or that
overridden by the command SET TERMINAL COLOR.
-------------------------------------------------------------------------------
Display Adapter Display Mode Screen Resolution and Coloring
EGA w/256KB Hi res color 16 dec 640x350, graphics saved, 16 colors.
Med res color 14 640x200, graphics saved, 8 colors.
Monochrome 15 640x350, graphics saved, b/w.
EGA w/64KB Hi res color 16 640x350, graphics not saved,
4 colors of red, white, blue, black.
Med res color 14 640x200, graphics saved, 8 colors.
Monochrome 15 640x350, graphics not saved.
CGA Color 6 640x200, graphics not saved, b/w.
Hercules Monochrome none 720x348, graphics saved if memory.
Monochrome Monochrome 7 80 by 25 text, graphics not saved.
AT&T/Olivetti any 72 640x400, grahics not saved, b/w.
Table 1-3: Adapters Supported by IBM PC MS-Kermit for Tektronix Emulation
-------------------------------------------------------------------------------
The technical details of Tektronix emulation are presented in section 1.15.7.
1.6.3. COMMANDS FOR FILE TRANSFER
MS-Kermit's SEND, GET, and RECEIVE invoke the Kermit file transfer protocol for
error-checked transmission of files between MS-Kermit and another Kermit
program on the other end of the connection. There are also commands for "raw"
transfer of files (no error checking) with systems that don't have Kermit
programs: LOG SESSION (for capturing text files on your PC) and TRANSMIT (for
uploading text files to the remote system).
During file transfer, MS-Kermit normally displays its progress on the screen as
shown in Figure 1-1. The items in the right-hand column are updated more or
less at random. In the current version, the percent done is filled in only
when sending files, not when receiving. Several other display options are also
available; see SET DISPLAY.
-------------------------------------------------------------------------------
Kermit-MS: V2.30 8 Jan 88
File name: FOT.
KBytes transferred: 7
Percent transferred: 52%
Sending: In progress
Number of packets: 74
Packet length: 93
Number of retries: 2
Last error: None
Last warning: None
Figure 1-1: MS-Kermit File Transfer Display Screen
-------------------------------------------------------------------------------
Although MS-Kermit makes no distinction between text and binary files, most
other Kermit programs do. Therefore, before you attempt to transfer binary
files with another type of system (say, a VAX, or an IBM mainframe), be sure to
give the appropriate command -- usually something like SET FILE TYPE BINARY --
to the Kermit on the remote end.
File transfers involving floppy disks will be slow and noisy. Hard disks are
much faster (and quieter), and RAM disks faster still (and totally silent).
But if you store files on a RAM disk, be sure to move them to a real disk be-
fore turning off your PC. And before attempting to transfer files to the PC,
make sure you have enough room on the selected device. Kermit does not provide
a way for you to change disks during a file transfer.
The SEND Command
Syntax: SEND filespec1 [filespec2]
The SEND command causes a file or file group to be sent from the local MS-DOS
system to the Kermit on the remote system. The remote Kermit may be running in
either server or interactive mode; in the latter case, you should already have
given it a RECEIVE command and escaped back to your PC. S is a special
non-unique abbreviation for SEND.
filespec1 may contain the wildcard characters "*" to match zero or more
characters within a field, and/or "#" (first position) or "?" (elsewhere) to
match any single character. If filespec1 contains wildcard characters then all
matching files will be sent, in the same order that MS-DOS would show them in a
directory listing. If filespec1 specifies a single file, you may direct
Kermit-MS to send that file with a different name, given in filespec2. For in-
stance, in the command
Kermit-MS>send foo.bar framus.widget
filespec2 begins with the first nonblank character after filespec1 and ends
with the carriage return; thus it may contain blanks or other unusual charac-
ters that may be appropriate on the target machine. The alphabetic case of
text in filespec2 is preserved in transmission, so if case matters on the tar-
get system, be sure to type filespec2 appropriately.
If the SEND command is specified by itself on the command line, then you will
be prompted separately for the name of the file to send, and the name to send
it under:
Kermit-MS>send
Local Source File: c:\chris\xcom1.txt
Remote Destination File: com1.txt
If a file can't be opened for read access, standard MS-DOS recovery procedures
will take place. For example:
Not ready error reading drive A
Abort, Retry, Ignore?
Kermit remains active even if you select "Abort" (DOS's word, not ours).
Files will be sent with their MS-DOS filename and filetype (for instance
FOO.TXT, no device or pathname). Special characters in the file name are not
converted. If there is no filetype, then only the name will be sent, without
the terminating dot. Each file is sent as is, with no conversions done on the
data, except for possibly stopping at a terminating Control-Z character (see
the SET EOF command).
Once you give Kermit-MS the SEND command, the name of each file will be dis-
played on your screen as the transfer begins. Packet, retry, and other counts
will be displayed along with informational messages during the transfer, in the
style specified by SET DISPLAY. If the file is successfully transferred, you
will see "Complete", otherwise there will be an error message. When the
specified operation is done, the program will sound a beep.
Several single-character commands may be given while a file transfer is in
progress:
^X (Control-X) Stop sending the current file and go on to the next one, if
any.
^Z Stop sending this file, and don't send any further files.
^C Return to Kermit-MS command level immediately without sending any kind of
notification to the remote system. (^Z or even ^E is preferable.)
^E Like ^C, but send an Error packet to the remote Kermit in an attempt to
bring it back to server or interactive command level.
CR Simulate a timeout: resend the current packet, or NAK the expected one.
Control-X, Control-Z, and Control-E send the proper protocol messages to the
remote Kermit to bring it gracefully to the desired state. Control-C leaves
the remote Kermit in whatever state it happens to be in, possibly retransmit-
ting its last packet over and over, up to its retry limit. You should only
have to use Control-C in dire emergencies (the remote Kermit is stuck, the
remote system crashed, etc), or at those times when you realize that you have
given a file transfer command to Kermit-MS without first having told the remote
Kermit about it.
The RECEIVE Command
Syntax: RECEIVE [filespec]
The RECEIVE command tells Kermit-MS to receive a file or file group from the
other system. The file is stored under the name it was transmitted with, ex-
cept that any illegal characters are translated to X's. Kermit-MS passively
waits for the file to arrive; this command is not to be used when talking to a
Kermit server (use GET for that). You should already have issued a SEND com-
mand to the remote Kermit and escaped back to Kermit-MS before issuing the
RECEIVE command. R is a special non-unique abbreviation for RECEIVE.
If the optional filespec is provided, incoming files will be stored under that
name. If the filespec is really just a path then files are stored where the
path indicates. If it is an actual filename the first incoming file is renamed
and any additional files either overwrite the first (if FILE WARNING is OFF) or
are renamed slightly from the filespec (digits are added to the end of the main
filename part before the dot and extension) if FILE WARNING is ON (the
default). The filespec may include any combination of the following fields:
Device designator
Store the file on the designated device, in the current directory for
that device. If no device designator is given, store it on the current
default device.
Directory path
Store the file in the designated directory. If no path given, store the
file in the current directory.
File name
Store the file under the name given. If no name is given, store it under
the name it was sent under, converted, if necessary, to suit DOS conven-
tions, and modified, if SET WARNING ON, to avoid overwriting any file of
the same name in the same directory.
If an incoming file does not arrive in its entirety, Kermit-MS will normally
discard it and it will not appear in your directory. You may change this be-
havior by using the command SET INCOMPLETE KEEP, which will cause as much of
the file as arrived to be saved on the disk.
The same single-character commands are available as during SEND:
^X Request that the remote Kermit stop sending the current file, and proceed
to the next one immediately. Since this is an optional feature of the
Kermit protocol, the remote Kermit might not honor the request.
^Z Request that the remote Kermit terminate the entire transfer; this is
also an optional feature that may or may not be supported by the remote
Kermit.
^C, ^E, and CR operate in the same way as they do during SEND. In this case,
^E should always do what ^Z is supposed to do.
If WARNING is OFF and you type ^X or ^Z to interrupt the transfer, you'll ei-
ther get a partial new file, or else both the old and the new file of that name
will be lost, depending on SET INCOMPLETE. In any case, when WARNING is off,
files with the same name as incoming files will not survive.
Caution: If an incoming file's name (the part before the dot) corresponds to an
MS-DOS device name, such as NUL, COM1, CON, AUX, or PRN, output will go to that
device, rather than to a file with that name. This is a feature of MS-DOS.
1.6.4. Hints for Transferring Large Files
During a prolonged file transfer session, things can go wrong that are beyond
Kermit's control. The longer the session, the greater the probability it will
be fatally interrupted. But you can take a few precautions:
- Make sure there is sufficient disk space at the receiving end. If
possible, first run a disk utility (such as CHKDSK on MS-DOS systems)
to clean out any bad disk blocks.
- If you are using a telephone connection, make sure your session won't
be interrupted by call waiting, people picking up other extensions,
etc.
- Don't attempt to transfer a single file of many megabytes over a
telephone connection. The longer the call, the greater the chance of
disconnection (carrier loss). Although it's a bother, it may save
time in the long run to break the file up into smaller pieces, trans-
fer the pieces, and then recombine on the other end.
- SET INCOMPLETE KEEP on the receiving end, so that if the transfer
fails, then the partial file will be retained. Then chop the part
that wasn't transferred into a separate file, reconnect, and send it.
Then join the pieces together.
Consider moving truly massive amounts of data on magnetic media. "Never under-
stimate the bandwidth of a station wagon full of magnetic tapes!"
1.6.5. Commands for Raw Uploading and Downloading
MS-Kermit can be used to send files to, or capture files from, remote systems
that do not have Kermit programs available. No error checking or correction is
done, so the results can very likely contain corrupted characters, spurts of
noise, gaps, or extraneous system messages or prompts. The command for upload-
ing is TRANSMIT, and for downloading LOG SESSION.
To minimize loss of data during these operations, be sure to SET the
FLOW-CONTROL and HANDSHAKE parameters to match the characteristics of the sys-
tem on the other end.
The TRANSMIT Command
Syntax: TRANSMIT filespec [prompt-character]
The TRANSMIT command provides a basic raw upload (export) facility to send
straight ASCII text files to the host without packets, error checking, or
retransmissions, but using all the currently selected communication parameters
for flow control, parity, etc. Information is read from the disk file a line
at a time, sent out the serial port, and the command waits for a single charac-
ter prompt (normally linefeed) from the host before sending the next file line.
A disk file line ends with carriage-return-linefeed (CRLF), but only the car-
riage return is sent, just as you only type carriage return at the end of a
line, not CR and LF. Most remote systems will echo the CR and then also supply
a LF, which indicates that they have processed the line and are ready for
another one. Setting the prompt to binary zero, \0, makes the TRANSMIT command
proceed without waiting for a prompt. Pressing the local Return key simulates
arrival of a prompt character.
Typically, before using this command to upload a file, you would start a text
editor (preferably a line-oriented, rather than full-screen, editor) on the
remote host and put it into text insertion mode. When the file has been com-
pletely transmitted, you would manually enter the required sequence for getting
the editor out of text insertion mode, and then make any necessary corrections
by hand. Here's an example for VAX/VMS:
Kermit-MS>set flow xon/xoff Set flow control to match VAX/VMS.
Kermit-MS>connect Connect to VAX.
$ edt foo.txt Start the EDT editor.
*i Put it into "insert" mode.
^]c Escape back to Kermit-MS.
Kermit-MS>transmit foo.txt Upload the file a line at a time.
... The lines are displayed on your screen.
Kermit-MS>connect When done, connect back to the VAX.
^Z Type Ctrl-Z to exit EDT insert mode.
*exit Exit from EDT to save the file.
$
If transmission appears to be stuck, you can wake it up by typing a carriage
return on the keyboard. You can cancel the TRANSMIT command by typing a
Control-C. Control-Z's or other control characters in the file may have ad-
verse effects on the host. For this reason, you should use TRANSMIT only for
files that contain 7-bit printing ASCII characters, spaces, tabs, carriage
returns, linefeeds, and possibly formfeeds.
The LOG SESSION Command
Syntax: LOG SESSION [filespec]
The LOG SESSION command lets you copy the characters that appear on your screen
during CONNECT into the specified file on the PC. You can use this command to
download files by displaying (usually with a command like TYPE) the file on the
remote system while logging is in effect. Example:
Kermit-MS>set flow xon/xoff Set flow control to match VAX/VMS.
Kermit-MS>connect Connect to the VAX.
$ type foo.bar Give this command, but don't type CR yet.
^]c Escape back.
Kermit-MS>log sess foo.bar Start logging.
Kermit-MS>connect Connect back.
Now type the carriage return.
This is the file FOO.BAR. The file is displayed on your screen
Blah blah ... and captured into PC file FOO.BAR.
$ The prompt is captured too.
^]c When done, escape back
Kermit-MS>close and close the log file.
The PC file FOO.BAR now contains a (possibly mutilated) copy of the remote
computer's FOO.BAR file. It probably has the remote system's prompt at the
end, which you can edit out. The session log can also be used to record
typescripts, editing sessions, Tektronix graphics output, or any other output
from, or dialog with, the remote computer. The LOG and CLOSE commands are
described further below, in section 1.6.8.
1.6.6. Kermit Server Commands
Kermit-MS can act as a Kermit server, and can also interact with other Kermit
servers. Normally, the remote Kermit is put into server mode. Then the local
Kermit becomes a "client", and may issue repeated commands to the server with-
out having to connect and escape back repeatedly. Servers can not only trans-
fer files, but can also provide a variety of file management functions. The
SERVER command puts MS-Kermit into server mode, and the DISABLE and ENABLE com-
mands modify the behavior of the server.
Kermit servers respond only to information sent as Kermit protocol packets and
not to ordinary CONNECT-mode commands. When MS-Kermit is the client, it uses
the SEND command (described above) to send files to a server, the GET command
(not RECEIVE) to get files from a server, the REMOTE commands to invoke the
file management functions of the server, and the BYE, FINISH, or LOGOUT com-
mands to shut down the server. The MS-Kermit server can also be returned to
interactive mode by typing Ctrl-C or Ctrl-Break on the PC's console keyboard.
The SERVER Command
Kermit-MS is capable of acting as a full-fledged Kermit server for users coming
in through one of the communication ports or a local area network. To put
Kermit-MS into server mode, first issue any desired SET commands to select and
configure the desired port, then DISABLE any undesired functions, and then type
the SERVER command. Kermit-MS will await all further instructions from the
client Kermit on the other end of the connection, which may be hardwired, or
connected through a network or autoanswer modem. In the following example, a
Kermit server is set up for dialing in:
Kermit-MS>set port 1
Kermit-MS>set baud 1200
Kermit-MS>connect
ATA
OK
^]c
Kermit-MS>set timer on
Kermit-MS>set warning on
Kermit-MS>disable all
Kermit-MS>server
Before putting Kermit in server mode in this case, it was necessary to connect
to the modem (in this example, a Hayes) and put it into autoanswer mode by
typing the ATA command.
MS-Kermit 2.30 server mode supports the following requests:
SEND REMOTE CWD REMOTE SEND
GET REMOTE DELETE REMOTE SPACE
FINISH REMOTE DIRECTORY REMOTE TYPE
BYE REMOTE HELP REMOTE WHO
LOGO REMOTE HOST
REMOTE CWD can be used to change both directories and devices. The REMOTE SEND
command accepts a one line message on the command line which will be displayed
on the operator's console. An MS-Kermit Server can DISABLE recognition of
selected REMOTE commands to help reduce accidents.
CAUTION: The method used for most of the REMOTE commands is to invoke a
task with the user's command line, redirect standard output to a tem-
porary file, $KERMIT$.TMP, send that file back to the remote end, and
then delete the file. Sufficient space must be available to store this
file. To service DOS commands or user tasks the boot drive must hold a
copy of COMMAND.COM. PATH will not be searched (this can be dis-
asterous on a floppy disk based system).
FURTHER CAUTION: Any of these DOS tasks or programs may encounter an
error, and in that case, DOS will generally put the familiar "Abort,
Retry, Ignore?" message on the screen, and will wait for an answer from
the keyboard. This will hang the server until a human comes to the
keyboard and gives a response. The same thing will happen when any
program is invoked that interacts with the real console. For instance,
REMOTE SPACE works by running CHKDSK and if CHKDSK finds something
wrong with the disk while tallying up the space, it will ask (at the
console) if you want to it to be fixed. This, too, will hang the serv-
er.
MORAL: The MS-DOS Kermit server should probably not be used for REMOTE
commands unless someone is around to take care of it when it gets
stuck.
For local network operation, the SET PORT NET command (with no node name) must
be issued before the SERVER command. MS-Kermit then becomes a network-wide
server, and other client Kermits can start a network session with it by using
the name of the Kermit Server, which is shown on the server's screen when SET
PORT NET is given. The Kermit Server accepts connections from other Kermits,
but only one at a time. There may be many Kermit Servers active on the network
simultaneously because each has a unique node name. Operations are exactly the
same as with serial port usage and the session (equivalent to a dialed phone
connection) is maintained between the pair until too many timeouts occur, or
the client Kermit issues a HANGUP command, exits to DOS, or SETs PORT NET to
another node. In the latter cases, the server remains available for use by
other client Kermits. If a client Kermit issues the BYE or FINISH command, the
network server is shut down (unless it was started with FIN disabled).
The DISABLE and ENABLE Commands
For security purposes, it may be desirable to leave your PC in Kermit server
mode so that it can be dialed in to, but with certain functions unavailable to
those who dial in. The DISABLE and ENABLE commands provide this control.
The DISABLE and ENABLE commands affect the following functions, with the effect
of DISABLEs noted:
CWD Changing of directories, disabled entirely.
DEL Deletion of files confined to current directory.
DIR Production of directory listings confined to current directory.
FIN Shutting down the server (applies also to BYE) disabled entirely.
GET Getting files from the server confined to current directory.
HOST Execution of all REMOTE HOST (DOS) commands disabled entirely.
SEND Forces files sent to server into current directory.
SPACE Asking the server for a disk space report, disabled.
TYPE REMOTE TYPE files confined to current directory.
ALL All of the above.
TEK Automatic invocation of Tektronix graphics mode by host commands.
This function is not related to server mode, and is not included in
the ALL term.
For reasons which should be obvious, the Kermit server does not provide a
REMOTE ENABLE command!
The GET Command
Syntax: GET remote-filespec
The GET command requests a remote Kermit server to send the file or file group
specified by remote-filespec. This command can be used only when Kermit-MS has
a Kermit server active on the other end of the connection. This means that you
must have CONNECTed to the other system, logged in, run Kermit there, issued
the SERVER command, and escaped back (e.g. "^]C") to the local Kermit-MS (or,
in the case of LAN operation, a Kermit server must be running somewhere on the
network). If the remote Kermit does not have a SERVER command, then you should
use SEND and RECEIVE as described above.
You may use the GET command in a special way to specify a different name for
storing the incoming file. Just type GET alone on a line, and you will be
prompted separately for the remote filespec and the local filespec:
Kermit-MS>get
Remote Source File: com1 txt
Local Destination File: a:xcom1.txt
The local file name may contain a device field, and/or a directory specifica-
tion. Device and directory specifications in the local destination file name
work the same way as in the RECEIVE command.
The remote filespec is any string that can be a legal file specification for
the remote system; it is not parsed or validated locally. It can contain
whatever wildcard or file-group notation is valid on the remote system.
Once the file transfer begins, the GET command behaves exactly like the RECEIVE
command.
Warning: If the remote filespec is to contain a semicolon, and the GET command
is being issued from a TAKE command file, you must prefix the semicolon with a
backslash. Otherwise, all characters beginning with the semicolon will be ig-
nored:
get me.home\;0
1.6.7. Commands for Controlling Remote Kermit Servers
The BYE, FINISH, and LOGOUT commands allow you to shut down a remote Kermit
server:
BYE When communicating with a remote Kermit server, use the BYE command to
shut down the server, log out its job, and exit locally from Kermit-MS
to DOS. On local area networks, BYE also terminates the network ses-
sion.
FINISH Like BYE, FINISH shuts down the remote server. However, FINISH does
not log out the server's job. You are left at Kermit-MS prompt level
so that you can connect back to the job on the remote system. On local
area nets, FINISH shuts down the MS-Kermit server, but in a way that
allows it to be restarted as if no interruption had occurred.
LOGOUT The LOGOUT command is identical to the BYE command, except you will
remain at Kermit-MS prompt level, rather than exit to DOS, so that you
can establish or use another connection without having to restart
MS-Kermit.
The REMOTE Commands
The REMOTE keyword is a prefix for a number of commands. It indicates that the
command is to be performed by a remote Kermit server. Not all Kermit servers
are capable of executing all of these commands, and some Kermit servers may be
able to perform functions for which Kermit-MS does not yet have the correspond-
ing commands. In case you send a command the server cannot execute, it will
send back a message stating that the command is unknown to it. If the remote
server can execute the command, it will send the results, if any, to your
screen.
Here are the REMOTE commands that Kermit-MS may issue:
REMOTE CWD [directory]
Ask the server to Change your Working Directory on the remote host,
that is, the default source and destination area for file transfer and
management. You will be prompted for a password, which will not echo
as you type it. If you do not supply a password (i.e. you type only a
carriage return), the server will attempt to access the specified
directory without a password. If you do not supply a directory name,
your default or login directory on the remote system will be assumed
and you will not be prompted for a password.
REMOTE DELETE filespec
Ask the server to delete the specified file or files on the remote sys-
tem. In response, the server may display a list of the files that were
or were not successfully deleted.
REMOTE DIRECTORY [filespec]
Ask the server to display a directory listing of the specified files.
If no files are specified, then the list should include all files in
the current working directory.
REMOTE HELP
Ask the server to list the services it provides.
REMOTE HOST [command]
Ask the server to send the command to the remote system's command
processor for execution.
REMOTE KERMIT command
Send the command to the remote Kermit for interpretation as a Kermit
command in the remote Kermit server's own command syntax. Most Kermit
servers, including Kermit-MS, do not yet recognize REMOTE KERMIT com-
mands.
REMOTE SEND message
Send the one line message to be displayed on the Server's screen.
REMOTE SPACE [directory]
Ask the server to provide a brief summary of disk usage in the
specified area on the remote host or, if none specified, the default or
current area.
REMOTE TYPE filespec
Ask the server to display the contents of the specified remote file or
files on your screen.
REMOTE WHO [who-spec]
Ask the server to list actively logged on users; optional who-spec
qualifies the list and uses the syntax of the server system.
1.6.8. The LOG and CLOSE Commands
Syntax: LOG {PACKET, SESSION} [filespec]
CLOSE
LOG SESSION specifies that your terminal session during CONNECT will be
recorded in the indicated file (whose name defaults to KERMIT.LOG in the cur-
rent directory), with any input character translations applied according to SET
TRANSLATION INPUT. The filespec may include a device specification and/or
directory path. The LOG SESSION command allows you to "capture" files from a
remote system that doesn't have Kermit, as well as to record remote
typescripts. LOG PACKET causes the log file to record all packets in file ex-
changes (DEBUG need not be set ON). Both kinds of logging can be active simul-
taneously but only one filename can be specified -- everything goes to the same
log file. The log is closed when you EXIT from Kermit-MS or when you issue an
explicit CLOSE command.
If the log file already exists then new material is appended to it. Try not to
delete an open log file (CLOSE it first) because DOS will become confused.
During terminal emulation, the LOG command records all the characters that ar-
rive from the remote host in the specified file, including escape sequences.
If you have SET LOCAL-ECHO ON, it will also record the characters you type.
Logging may be suspended and resumed within a terminal session with the CONNECT
escape-level commands Q and R. The log file will be composed of 7-bit ASCII
bytes if (a) PARITY is other than NONE, or (b) DISPLAY is SET to 7. If DISPLAY
is 8 and PARITY is NONE, or if DEBUG is ON, then the log will contain 8-bit
bytes.
You may LOG PRN to cause the logging information to be printed directly on your
printer. Any escape sequences that are sent to the screen are also sent to the
printer.
If you want to record information without imbedded escape sequences, use the
screen dump feature, invoked by the CONNECT escape-level command F, which is
described under the CONNECT command.
A session log cannot be played back directly on the PC from the log file. To
relive the session, you must transfer it to the remote system and display it in
"binary mode" (e.g. cat in Unix) which CONNECTed.
1.6.9. The SET Command
Syntax: SET parameter value
-or- SET parameter parameter value
The SET command establishes or modifies parameters for file transfer or ter-
minal connection. You can examine their values with the STATUS command. The
following SET commands are available in Kermit-MS:
BAUD Communications port line speed (synonym for SPEED)
BELL Whether to beep at the end of a transaction
BLOCK-CHECK-TYPE Level of error checking for file transfer
DEBUG Display packet contents during file transfer
DEFAULT-DISK Default disk drive for file i/o
DELAY Wait number seconds before Sending a file
DESTINATION Default destination device for incoming files
DISPLAY For selecting the type of file transfer display
DUMP Screen dump file (or device) name
END-OF-LINE Packet termination character
EOF Method for determining or marking end of file
ESCAPE Escape character for CONNECT
FLOW-CONTROL Enable or disable XON/XOFF
HANDSHAKE Half-duplex line turnaround option
INCOMPLETE What to do with an incompletely received file
INPUT Behavior of INPUT command for scripts
KEY Specify key redefinitions
LOCAL-ECHO Specify which computer does the echoing during CONNECT
MODE-LINE Whether to display a mode line during terminal emulation
PARITY Character parity to use
PORT Select a communications port
PROMPT Change the "Kermit-MS>" prompt to something else
RECEIVE Request remote Kermit to use specified parameters
REMOTE For running Kermit-MS interactively from back port
RETRY Packet retransmission threshold
SEND Use the specified parameters during file transfer
SPEED Communications port line speed (synonym for BAUD)
TAKE-ECHO Control echoing of commands from TAKE files
TERMINAL Emulation and parameters
TIMER Enable/disable timeouts during file transfer
TRANSLATION Enable/disable/specify conversion of arriving characters
WARNING Specify how to handle filename collisions
The SET commands are now described in detail, in alphabetical order.
SET BAUD
Syntax: SET BAUD number
Set the speed (in bits per second, commonly called baud) of the currently
selected terminal communications port (COM1 by default) to 300, 1200, 1800,
2400, 4800, 9600, or other common speed, and on the IBM PC family, higher
speeds including 19200, 38400, 57600, and 115200. Both connected systems, as
well as any intervening communication equipment, must be able to support the
specified baud rate, and both systems should be set to the same baud rate.
Some implementations do not support the SET BAUD command. But Kermit-MS leaves
the current communication port settings alone unless you issue explicit SET
commands to change them, so you may use MODE or other DOS programs to establish
the desired settings before running Kermit.
On certain systems, when you first run Kermit after powering the system up, you
may get a message "Unrecognized baud rate". This means that Kermit tried to
read the baud rate from the port and none was set. Simply use SET BAUD (if
available) or the DOS MODE command to set the desired baud rate.
SET SPEED is a synomym for SET BAUD.
SET BELL
Syntax: SET BELL {ON, OFF}
Specifies whether the bell (beeper) should sound upon completion of a file
transfer operation. Normally ON.
SET BLOCK-CHECK-TYPE
Syntax: SET BLOCK-CHECK-TYPE {1, 2, 3}
Selects the error detection method: a 1-character 6-bit checksum (the normal
case), a 2-character 12-bit checksum, or a 3-character 16-bit cyclic redundancy
check (CRC). If the other Kermit program is not capable of type 2 or 3 check-
ing methods, automatic fallback to type 1 will occur. The more secure type 2
and 3 block checks take essentially no more execution time than the simple 1
character checksum. SET BLOCK 3 is a stronger check than SET BLOCK 2. SET
BLOCK 2 or 3 is recommended for use with long packets (see below), noisy com-
munication lines, binary (8-bit data) files, and text files containing critical
data (budgets, grades, etc).
SET DEBUG
Syntax: SET DEBUG {PACKET, SESSION, ON, OFF}
With DEBUG PACKET, Kermit will display packet traffic on your screen during
file transfer. With the normal file transfer display, regular-length packets
sent and received are displayed in fixed-size slots. The display of
extended-length packets, however (see SET RECEIVE PACKET-LENGTH), tends to
overlap. If this bothers you, then also SET DISPLAY SERIAL, or LOG the packets
rather than displaying them.
With DEBUG SESSION, during terminal emulation (on the IBM PC, Rainbow, and a
few others), control characters are displayed in uparrow ("^") notation and
characters with the 8th bit set are preceded by the tilde ("~") sign, and your
session log (if any) will record 8-bit bytes, rather than 7-bit ASCII, regard-
less of SET DISPLAY or SET PARITY. Character translation (SET TRANSLATION
INPUT) is not done during session debugging. The effect of SET DEBUG SESSION
during terminal connection can be disconcerting, but it gives you a convenient
line monitor equivalent to a specialized device that costs several thousand
dollars, and it can prove very handy for tracking down data communication
problems.
SET DEBUG ON turns on both SESSION and PACKET debugging, and SET DEBUG OFF
turns them both off.
SET DEFAULT-DISK
Syntax: SET DEFAULT-DISK x:
Specify the default disk drive to use for file transfer, directory listings,
and so forth. Equivalent to typing the DOS command for changing disks (A:, B:,
etc). Affects Kermit and all inferior processes, but when you exit from Ker-
mit, you will still have the same default disk as when you entered.
SET DELAY
Syntax: SET DELAY number
Wait the specified number of seconds before starting a file transfer. Intended
for use when the other side needs appreciable time to become ready, such as
rearranging cables, changing programs, etc., or when MS-DOS Kermit is the
remote Kermit (e.g. after CTTY COM1, SET REMOTE ON). The number is 0 to 63
seconds, normally 0.
SET DESTINATION
Syntax: SET DESTINATION {DISK, PRINTER, SCREEN}
SET DESTINATION PRINTER will cause incoming files to be sent directly to the
printer; SCREEN will send output normally destined for the disk to the screen.
The normal destination is DISK. SET DESTINATION affects only files transferred
with SEND, GET, or RECEIVE; it cannot be used to reroute the output from REMOTE
server commands.
SET DISPLAY
Syntax: SET DISPLAY {QUIET, REGULAR, SERIAL, 7-BIT, 8-BIT}
During file transfer, MS-DOS Kermit's regular display is a formatted screen
whose fields are randomly updated with file names, packet numbers, error
counts, percent done, error messages, and so forth.
If you wish to run Kermit-MS interactively through the back port, for instance
after the operator has done CTTY COM1, you must give the command SET REMOTE ON
(which, currently at least, is equivalent to SET DISPLAY QUIET); this sup-
presses the file transfer display screen, so that the display won't interfere
with the file transfer itself. You can also use this command to suppress the
display in local mode, in case you are using a system that allows you to do
other work while file transfer proceeds in the background.
If you have your PC connected to a speaking device (a common practice for
visually impaired people), or you are logging the display screen to a printer
(using DOS ^P or kermit > prn), the random nature of the regular display will
make the results of little use. SET DISPLAY SERIAL is provided for this pur-
pose; it causes the program to report progress "serially" on the screen. In
serial mode, error messages are preceeded with the word "Error" and repeat mes-
sages with the word "Retry". Packets are numbered as dots with every tenth be-
ing a plus sign. The packet display is automatically broken across lines at
every 70th packet. The serial display makes much more sense when spoken than
does the regular display.
The serial display does not show the percent and kilobytes transferred. It is
the default display style for generic MS-DOS Kermit; REGULAR is the default for
all others.
The last two parameters, 7-BIT and 8-BIT, control the size of characters sent
to the screen during terminal emulation. 7-BIT is the default and includes all
ASCII characters. 8-BIT is useful with national and line drawing characters.
SET DUMP
Syntax: SET DUMP filespec
On those systems that support this feature, change the file or device name of
the screen dump file. The normal file name is KERMIT.SCN. See the section on
terminal emulation for details about screen dumps. If the specified file al-
ready exists then new material is appended to old.
SET END-OF-LINE
Syntax: SET END-OF-LINE number
If the remote system needs packets to be terminated by anything other than car-
riage return, specify the decimal value, 0-31, of the desired ASCII character.
Equivalent to SET SEND END-OF-LINE (SET END-OF-LINE is kept only for historical
reasons, and the parameter really should be called END-OF-PACKET anyway.)
SET EOF
Syntax: SET EOF {CTRL-Z, NOCTRL-Z}
Controls how the end of file is handled. CTRL-Z specifies a Control-Z charac-
ter should be appended to the end of an incoming file, unless it already ends
with a Control-Z. Certain MS-DOS text editors and other applications require
files to be in this format. For outbound files, treat the first Control-Z as
the end of the local file, and do not send it or any subsequent characters.
NOCTRL-Z is the default; incoming files are stored, and MS-DOS files are sent,
exactly as is, in their entirety.
SET ESCAPE
Syntax: SET ESCAPE character
Specify the control character you want to use to "escape" from remote connec-
tions back to Kermit-MS. On most systems the default is "^]" (Control-
Rightbracket), which was chosen because it is a character you would otherwise
rarely type.
The character is entered literally after SET ESCAPE or in backslash number form
(\29), and should be chosen from the ASCII control range. It is not possible
to use non-ASCII characters (like function keys) for this purpose (but see SET
KEY for a way around this restriction).
SET FLOW-CONTROL
Syntax: SET FLOW-CONTROL {XON/XOFF, NONE}
Specify the full duplex flow control to be done on the currently selected port.
The options are XON/XOFF and NONE. The specified type of flow control will be
done during both terminal emulation and file transfer. By default, XON/XOFF
flow control is selected. XON/XOFF should not be used on half-duplex (local
echo) connections, or with other systems that do not support it. If XON/XOFF
is used, HANDSHAKE should be set to NONE.
SET HANDSHAKE
Syntax: SET HANDSHAKE {CODE number, BELL, CR, LF, NONE, XOFF, XON}
Specify any half-duplex line turnaround handshake character to be used during
file transfer on the currently selected port. The CODE number form allows any
ASCII character to be specified by its decimal ASCII code. Handshake is NONE
by default; if set to other than NONE, then FLOW-CONTROL should be set to NONE.
In operation the handshake character is sought at the end of each received
packet, following the normal END-OF-LINE character, but is not sent for out-
going packets.
SET INCOMPLETE
Syntax: SET INCOMPLETE {DISCARD, KEEP}
Specifies what to do with files that arrive incompletely: discard them or keep
them. They are normally discarded.
SET INPUT
Syntax: SET INPUT {CASE, DEFAULT-TIMEOUT, ECHO, TIMEOUT-ACTION}
SET INPUT controls the behavior of the script INPUT command (see the section on
scripts for more information):
SET INPUT CASE {IGNORE, OBSERVE}
Says whether or not to distinguish upper and lower case letters when doing
a matchup in the INPUT command. OBSERVE causes upper and lower case let-
ters to be distinguished. The default is to IGNORE case distinctions.
SET INPUT DEFAULT-TIMEOUT seconds
Changes the waiting time from one second to this new value.
SET INPUT ECHO {ON, OFF}
Show on the screen characters read from the serial port during the script
operation, or not. Default is ON, show them.
SET INPUT TIMEOUT-ACTION {PROCEED, QUIT}
Determines whether or not the current TAKE command file is to be continued
or exited if a timeout occurs. PROCEED is the default and means that
timeouts are ignored. QUIT causes the current script file to be exited and
control passed to either the next higher level script file (if there is
one) or to Kermit's main prompt.
SET KEY
Syntax: SET KEY key-specifier [key-definition]
Also: SET KEY {ON, OFF, CLEAR}
WARNING: The format and functions of this command have changed substan-
tially since version 2.29B and earlier. The changes were made in order
to allow key redefinition to work on a wider variety of systems and
keyboards without customization of the program source code for each
configuration. See section 1.10 for further details.
The SET KEY command is one of the most useful -- and confusing -- features of
MS-Kermit. Typical uses:
- You're used to having the ESC key in the upper left corner of the
keyboard, but your new PC keyboard has an accent grave ("`") there.
You can use SET KEY to make the accent key transmit an ESC, and you
can assign accent grave to some other key.
- You send a lot of electronic mail, and always sign it the same way.
You can put your "signature" on a single key to save yourself a lot
of repetitive typing.
- You must set up your PC's function keys or numeric keypad to work
properly with a host application.
The SET KEY command does these things and more, and SHOW KEY gives us assis-
tance. A key can be defined to:
- send a single character other than what it would normally send,
- send a string of multiple characters,
- invoke a CONNECT-mode Kermit action verb,
- send itself again.
SET KEY specifies that when the designated key is struck during terminal emula-
tion, the specified character or string is sent or the specified Kermit action
verb is performed. Key definitions operate only during CONNECT, not at
Kermit-MS> or DOS command level.
The key-specifier is the identification of the key expressed in system-depend-
ent terms. This can be a letter, such as Q for the key which emits an upper
case Q, or the numeric ASCII value of the letter in backslash notation (e.g.
"\81"), or else the numerical "scan code" observed by the system when the key
is pressed (e.g. "\3856" for Ctrl-Alt-Q on an IBM PC). Material printed on
keycaps is not necessarily a guide to what the key-specifier should be. When
the word CLEAR is used in place of a key-specifier, all key definitions are
cleared and then any built-in definitions are restored.
A string definition is one or more characters, including 8-bit values expressed
in backslash form, such as
SET KEY \315 top \13 list\13 IBM F1 key sends "top <cr> list<cr>"
SET KEY S L S key sends upper case L
SET KEY T \27[m T key sends three bytes ESC [ m
The string begins with the first non-spacing character following the key iden-
tification and continues until the end of line, exclusive of any trailing
spaces. If a semicolon comment is used and the definition is given in a TAKE
file, the line ends at the last non-spacing character before the semicolon.
Curly braces, {...<}>, can be use to delimit the string in case you want the
definition to include trailing spaces. All text after the closing bracket is
ignored.
SET KEY \315 {login } this extra text is ignored
This manual does not contain a list of all the scan codes for all the keys on
all the keyboards on all the PCs supported by MS-Kermit -- that would be a
manual in itself. Rather, in order to obtain the key-specifier for the SET KEY
command, you must type a SHOW KEY command and press the desired key or key com-
bination. This will report a scan code that you can use as the key specifier
in a SET KEY command. To do this for many keys is a laborious process, so you
should collect all your SET KEY commands into a file, which you can TAKE, or
put them in your MSKERMIT.INI file.
If you enter SET KEY by itself, with no key specifier, the command will prompt
you to press the selected key and again for the definition string. Certain
characters, like ESC and CR, may not be entered literally into the string, but
can be included by inserting escape codes of the form \nnn, a backslash fol-
lowed by a 1- to 4-digit number corresponding to the ASCII value of the desired
character. Where an ASCII digit follows directly after a backslash number,
confusion can be avoided by placing curly braces {} around the backslashed num-
ber; thus, \{27}5 represents the two ASCII characters ESC 5.
Here is an example of the use of SET KEY to assign ESC (ASCII 27) to the accent
grave key. First the user gets the key-specifier for the key:
Kermit-MS>show key
Push key to be shown (? shows all): `
ASCII char: ` \96 decimal is defined as
Self, no translation.
Free space: 145 keys and 96 string definitions, 894 string characters.
The free space report says that 145 more keys may be redefined, and up to 96 of
them may have multi-character strings assigned to them (as opposed to single
characters), and that there are 894 bytes left for these strings, in total.
Confident that there is enough space left for a new key definition, the user
proceeds:
Kermit-MS>set key
Push key to be defined: `
Enter new definition: \27
Once a key definition is constructed and tested, it may be entered on a single
line in a command file (such as MSKERMIT.INI):
set key \96 \27
To prevent accidents, SET KEY shows the current definition before asking for a
new one; enter a Control-C to keep the current definition, or a carriage return
to undefine the key, or a query mark (?) to see available choices.
A more exact definition of SET KEY follows these construction rules:
SET KEY [<key-ident><whitespace><definition>]
where <key-ident> is:
- a single ordinary printable ASCII character, or
- the numerical equivalent of an ASCII character (ESC is \27), or
- a scan code written as a backslashed number (e.g. \3856 for
Ctrl-Alt-Q), or
- keyword CLEAR which removes all current key definitions and then
restores any built-in definitions.
- ? (a question mark), which displays a help message.
Scan codes, non-printing ASCII characters, 8-bit characters, and other binary
codes are written in backslash form (see Table 1-1 for ASCII codes):
\123 a decimal number (decimal is the default number base)
\d789 a decimal number (also \D)
\o177 an octal number (also \O)
\x0d a hexadecimal number (also \X)
\{b###} braces around material following the slash, where the
numerical base letter b is d, o, x, or absent.
<whitespace> is one or more spaces and or tabs.
<definition> is:
missing altogether which "undefines" a key.
\number (a number in backslash notation between 0 and 255 decimal)
- assigns a character with the corresponding 8-bit value.
\Kverb for a Kermit action verb; upper or lower case K is OK.
\{Kverb} Same. Verb is the name of an action verb.
text a string with allowed embedded whitespace and embedded bi-
nary chars as above. This kind of string may not commence
with sequences \K or \{K. The string begins with the first
non-whitespace character and ends at the end of the line
(exclusive of trailing spaces and comments).
{text} string confined to material within but excluding the
braces. Note, where the number of opening braces exceeds
the number of closing braces the end of line terminates the
string:
{ab{}{{c}d ==> ab{}{{c}d
but
{ab}{{c}d ==> ab
? Displays help message and lists all action verbs.
Control-C Quits the Set Key command without making changes.
Curly braces can be used to separate backslash numbers from regular ASCII text,
such as when we want to send the two bytes ESC 8 (ESC is decimal 27):
SET KEY T \{27}8
SET KEY L {words \{27}8 more words} trailing junk to be ignored
If a string begins with a left curly brace then Kermit counts them and ends the
string on the matching right curly brace (or end of line); the SET KEY L ex-
ample above relies on brace matching to omit the trailing comment. The outer
curly brace delimiters are not sent but the inner ones are; for example:
SET KEY U {a {b}\{27}8} sends the 7 bytes "a {b}ESC8"
SET KEY U a{ {b}\{27}8} sends the 9 bytes "a{ {b}ESC8}"
SET KEY U a{ {b}\{{27}}8} sends the 15 bytes "a{ {b}\{{27}}8}"
A definition is removed, that is a key is defined as itself, by giving an empty
definition:
SET KEY q q key sends q again
SET KEY \331 IBM left arrow key is undefined.
The keyboard can be restored to its startup state, that is all redefinitions
removed and all built-in defitions restored, by using the keyword CLEAR in
place of the key identification:
SET KEY CLEAR
Undefined keys which do not send ASCII characters are trapped by the keyboard
translator and are rejected; a beep results from using an undefined non-ASCII
key.
SET KEY OFF directs MS-Kermit to read keycodes from DOS, rather than BIOS, so
that console drivers like ANSI.SYS that operate at the DOS level may be used
during Kermit CONNECT sessions. This would also apply to any special keyboard
replacements that come with DOS-level drivers. SET KEY ON turns key definition
back on, and returns Kermit to processing keystrokes at the BIOS level.
Kermit Action Verbs:
An action verb is the shorthand expression for a named Kermit procedure, such
as "generate the proper sequence for a left arrow," "show status," "send a
BREAK," and others; verbs are complex actions and each verb has a name. In a
key definition the verb name is preceeded by backslash K (\K) to avoid being
confused with a string. Verbs and strings cannot be used together on a key.
SET KEY \331 \Klfarr
SET KEY \2349 \Kexit
makes the IBM keyboard left arrow key execute the verb named lfarr which sends
the proper escape sequence for a VT102 left arrow key (which changes depending
on the internal state of the VT102). The leading \K identifies the definition
as a Kermit verb, so no string can start as \K or as \{K in upper or lower case
(use \92K). The second example has Alt-X invoking the Leave-Connect-Mode verb
"exit" (same as Kermit escape character "^]" followed by C).
Each system has its own list of verbs and predefined keys. Table 1-4 shows
those available for the IBM PC family (there are also some additional verbs for
reassigning Heath or VT100 function keys, see section 1.15.2). The SET KEY
command shows the list of available verbs when a query mark (?) is given as a
definition. SHOW KEY displays all currently defined keys or individually
selected ones; SHOW KEY can be executed only interactively.
-------------------------------------------------------------------------------
Verb Meaning
\Kupscn Roll up (back) to previous screen
\Kdnscn Roll down (forward) to next screen
\Khomscn Roll up to top of screen memory
\Kendscn Roll down to end of screen memory (current position)
\Kupone Roll screen up one line
\Kdnone Roll screen down one line
\Kprtscn Print the current screen
\Kdump Append the current screen to dump file
\Klogoff Turn off session logging
\Klogon Turn on session logging
\Ktermtype Toggle terminal type
\Kreset Reset terminal emulator to initial state
\Kmodeline Toggle modeline off/on
\Kbreak Send a BREAK signal
\Klbreak Send a "long BREAK" signal
\Khangup Drop DTR so modem will hang up phone
\Knull Send a null (ASCII 0)
\Kdos "Push" to DOS
\Khelp Display CONNECT help message
\Kstatus Display STATUS message
\Kexit Escape back from CONNECT mode
\Kgold,\Kpf1 VT102 keypad function key PF1
\Kpf2..\Kpf4 VT102 keypad function keys
\Kkp0..\Kkp9 VT102 keypad numeric keys
\Kkpdot,\Kkpminus,\Kkpcoma,\Kkpenter Other VT102 keypad keys
\Kuparr,\Kdnarr,\Klfarr,\Krtarr VT102 cursor (arrow) keys
Table 1-4: Kermit-MS Verbs for the IBM PC Family
-------------------------------------------------------------------------------
Some systems have preset key definitions when Kermit first begins (those for
the IBM PC are shown in section 1.15.2). You can find out what they are on
your system by typing SHOW KEY, and then question mark on the next line. You
may supplement or change the predefined keys with SET KEY commands typed inter-
actively or in MSKERMIT.INI or other command files.
The MS-Kermit CONNECT command may be used in conjunction with certain console
drivers that do their own key redefinitions. Since MS-Kermit intercepts
keystrokes at the BIOS level, drivers like ANSI.SYS which work at the DOS level
will have no effect during CONNECT, even though they work at MS-Kermit command
level. Other drivers, like SuperKey and ProKey, work at the BIOS level, and
their key assignments will remain effective during Kermit terminal sessions,
and additional Kermit SET KEY assignments may be made "on top" of them.
SET LOCAL-ECHO
Syntax: SET LOCAL-ECHO {ON, OFF}
Specify how characters are echoed during terminal emulation on the currently
selected port. ON specifies that characters are to be echoed by Kermit-MS
(because neither the remote computer nor the communications circuitry has been
requested to echo), and is appropriate for half-duplex connections. LOCAL-ECHO
is OFF by default, for full-duplex, remote echo operation.
SET MODE-LINE
Syntax: SET MODE-LINE {ON, OFF}
On systems, like the IBM PC family, which are capable of displaying a status,
or "mode" line on the 25th line during terminal connection, disable or enable
this function. This command has no effect on systems that do not display a
mode line during connect.
The mode line shows several important facts about the connection, like which
port is being used, the baud rate and parity, the current escape character,
etc. When the mode line is enabled, it may be turned on and off using the CON-
NECT escape-level command M or the Kermit verb "modeline".
The mode line occupies the 25th line of those systems that have such a thing,
and is not affected by scrolling (on some systems that have large screens, the
mode line should appear on whatever the bottom line is, e.g. the 43rd). When
emulating a VT102 or Heath-19, Kermit will allow the host to address the 25th
line directly using cursor positioning commands. If this happens, Kermit will
remove its mode line and relinquish control of the 25th line to the host (as if
you had typed SET MODE OFF). When no terminal is being emulated, the 25th line
(if any) is available for scrolling. If the mode line is disabled by an ap-
plication or by the command SET MODE OFF then the only way to revive Kermit's
mode line display is to give the command SET MODE ON. On IBM systems support-
ing different length displays, the host needs to address the bottom line ex-
plicitly. Also, note the line is saved and restored when CONNECT mode is
exited and reentered so an old "fossil" mode line may reappear unexpectedly.
If this happens, you can escape back to the Kermit prompt, say SET MODE ON,
CONNECT, and toggle it off ("^]M") to clear the line.
SET PARITY
Syntax: SET PARITY {EVEN, ODD, MARK, SPACE, NONE}
Specify the character parity to be used on the currently selected port. NONE
means no parity processing is done, and the 8th bit of each character can be
used for data when transmitting binary files. This is the normal case. If
parity is other than none, then there will be 7 data bits (use of parity with 8
data bits is not supported).
If you have set parity to ODD, EVEN, MARK, or SPACE, then Kermit-MS will re-
quest that binary files be transferred using 8th-bit-prefixing. If the other
Kermit knows how to do 8th-bit-prefixing (this is an optional feature of the
Kermit protocol, and some implementations of Kermit don't have it), then 8-bit
binary files can be transmitted successfully. If NONE is specified, 8th-bit-
prefixing will not be requested. Note that there is no advantage to using
parity. It reduces Kermit's file transfer efficiency without providing ad-
ditional error detection. The SET PARITY command is provided only to allow
Kermit to adapt to conditions where parity is required, or 8-bit transmission
is otherwise thwarted.
You will need to SET PARITY to ODD, EVEN, MARK, or possibly SPACE when com-
municating with a system, or over a network, or through modems, concentrators,
multiplexers, or front ends that require or impose character parity on the com-
munication line. For instance, most IBM mainframe computers use EVEN or MARK
parity; Telenet normally uses MARK parity. If you neglect to SET PARITY when
the communications equipment requires it, the symptom may be that terminal
emulation works (well or maybe only partially), but file transfer or script IN-
PUT commands do not work at all.
If parity is in use, then the display during terminal emulation, as well as any
session log, will be 7-bit ASCII, unless you have SET DEBUG ON (q.v.).
There may be situations in which you require 7-bit ASCII with no parity during
terminal emulation, but still want to force 8th bit prefixing during file
transfer. To accomplish this, SET PARITY SPACE.
The INPUT and TRANSMIT commands use 7 or 8 bits if parity is NONE, according to
the SET DISPLAY command, and this may upset recognition of received characters
when the host unexpectedly sends them with its own parity.
SET PORT
Syntax: SET PORT {number, COM1, COM2, NET [nodename]}
On machines with more than one communications port, select the port to use for
file transfer and CONNECT. This command lets you use a different asynchronous
adapter, or switch between two or more simultaneous remote sessions. Sub-
sequent SET BAUD, PARITY, HANDSHAKE, FLOW, and LOCAL-ECHO commands will apply
to this port only -- each port remembers its own parameters, so that you may
set them for each port and then switch between ports conveniently with the SET
PORT command.
SET PORT 1 selects COM1, SET PORT 2 selects COM2. All versions default to port
1, except for the IBM PCjr, which uses port 2 if its internal modem is in-
stalled. Additionally, COM3 and COM4 are supported for IBM PC's if the system
is informed of their presence (as explained in Section 1.16.3).
In "generic" MS-DOS Kermit, the following alternate forms allow you to experi-
ment with device names or numbers until you find the communication port:
SET PORT {DEVICE, FILE-HANDLE}
Just type a carriage return after either of these commands, and you will be
prompted for a device name or a numeric port-handle. Keep trying till you find
one that works. File-handle 3, the system auxillary device, is conventional on
many machines, as are device names COM1, COM2, and AUX.
MS-Kermit for the IBM PC family is able to operate over local area networks
through the NetBIOS interface. The command
SET PORT NET [nodename]
redirects communications the LAN board installed in the local computer and the
associated NetBIOS emulator software, if active, rather than the serial port or
the COM device driver. It installs a unique Kermit node name in the local LAN,
so that other nodes can refer to it when files are transferred or terminal
emulation is done. This name is displayed when you give the SET PORT NET com-
mand. The server should use SET PORT NET, and the client should use SET PORT
NAME nodename, specifying the server's name, e.g. CHRIS.K. Note that al-
phabetic case is significant in node names!
Both the regular serial port and a network connection can be kept alive simul-
taneously; clearly, only one can be used at a time under MS-DOS. MS-DOS 3.x is
not required for Kermit network usage, but most LANS do need DOS 3.1 or later
for conventional file server work. Kermit needs only the NetBIOS emulator net-
work software.
SET PROMPT
Syntax: SET PROMPT [string]
This command allows you to change the MS-DOS Kermit program's prompt. The
string may be enclosed in curly braces. Control characters like ESC can be in-
cluded as backslashed numbers like "\27". ANSI.SYS and similar console drivers
can be programmed through this command. The string must be less than 128
characters. If the string is omitted (missing) Kermit's original prompt of
"Kermit-MS>" is restored.
SET RECEIVE
Syntax: SET RECEIVE parameter value
This command lets you modify the ways in which MS-Kermit asks the other Kermit
to behave. That is, it controls the file transfer protocol options for packets
sent to MS-Kermit by the other Kermit. The parameters and values you specify
in the SET RECEIVE command are sent to the other Kermit during initial negotia-
tions.
END-OF-LINE number
ASCII value of packet terminator to look for on incoming packets. Nor-
mally carriage return. Use this command if the other Kermit is ter-
minating its packets with some other control character.
PACKET-LENGTH number
Ask the remote Kermit to use the specified maximum length for packets
that it sends to Kermit-MS. The normal length is 94 bytes. Use this
command to shorten packets if the communication line is noisy or ter-
minal buffers somewhere along the path are too small. Shorter packets
decrease the probability that a particular packet will be corrupted,
and will reduce the retransmission overhead when corruption occurs, but
will increase the protocol overhead.
If a length greater than 94 is specified, a protocol option called
"long packets" will be used, provided the other Kermit also supports
it. Kermit-MS handles extended-length packets up to 1000 bytes long.
Long Packets can improve efficiency by reducing the per-packet overhead
for a file, but they will not be used unless you issue this command.
Before using this option, ensure that the equipment on the communica-
tions pathway can absorb a long packet, and that the connection is
clean (retransmission of long packets is expensive!). You should also
SET BLOCK-CHECK 2 or 3 for more reliable error checking.
PADCHAR number
Ask the remote Kermit to use the given control character (expressed as
a decimal number 0-31, or 127) for interpacket padding. Kermit-MS
should never require any padding.
PADDING number
Ask the remote Kermit to insert the given number of padding characters
before each packet it sends. MS-Kermit never needs padding, but this
mechanism might be required to keep some intervening communication
equipment happy.
START-OF-PACKET number
If the remote Kermit will be marking the beginning of packets with a
control character other than Control-A, use this command to tell
Kermit-MS about it (the number should be the decimal ASCII value of a
control character). This will be necessary only if the hosts or com-
munication equipment involved cannot pass a Control-A through as data,
or if some piece of communication equipment is echoing packets back at
you.
TIMEOUT number
Ask the remote Kermit to time out after the given number of seconds if
a packet expected from Kermit-MS has not arrived. Use this command to
change the other Kermit's normal timeout interval.
SET REMOTE
Syntax: SET REMOTE {ON, OFF}
SET REMOTE ON removes the file transfer display (as if you had given the com-
mand SET DISPLAY QUIET). It should be used when you are running Kermit-MS in
remote mode when coming in from another PC through the Kermit-MS's "back port",
to which the console has been reassigned using the DOS CTTY command, e.g.
CTTY COM1
It is necessary to issue the SET REMOTE ON command because (a) Kermit-MS has no
way of knowing that its console has been redirected, and (b) when the console
is the same as the port, the file transfer display will interfere with the file
transfer itself. SET REMOTE OFF returns the file transfer display to its
preferred style (REGULAR or SERIAL). When you SET REMOTE ON, you might also
want to SET DELAY 5 or thereabouts, to allow yourself time to escape back to
the local system before MS-Kermit starts sending packets.
WARNING: During CTTY console redirection, many programs still output to the
real screen and require input from the real keyboard and will hang the system
until keyboard requests are satisfied. On the IBM PC, CTTY CON returns control
to the normal keyboard and screen (other systems may use other device names).
See section 1.16.4 for further details about remote operation.
SET RETRY
Syntax: SET RETRY number
Sets the number of times a packet is retransmitted before the protocol gives
up. The number of retries can be between 1 and 63, and is 5 by default. This
is an especially useful parameter when the communications line is noisy or the
remote host is very busy. The initial packet of a file exchange is given three
times as many retries to allow both systems to become ready.
SET SEND
Syntax: SET SEND parameter value
The SET SEND command is primarily used to override negotiated protocol options,
or to establish them before they are negotiated.
END-OF-LINE number
ASCII value of packet terminator to put on outbound packets. Normally
carriage return. Use this command if the other Kermit needs its pack-
ets terminated with a nonstandard control character.
PACKET-LENGTH number
Use this as the maximum length for outbound packets, regardless of what
was negotiated with the other Kermit. Normally, you would use this
command only to send shorter packets than the other Kermit requests,
because you know something the other Kermit doesn't know, e.g. there's
a device on the communication path with small buffers.
PADCHAR number
Use the specified control character for interpacket padding. Some
hosts may require some padding characters (normally NUL or DEL) before
a packet, and certain front ends or other communication equipment may
need certain control characters to put them in the right modes. The
number is the ASCII decimal value of the padding character, (0 - 31, or
127).
PADDING number
How many copies of the pad character to send before each packet, nor-
mally zero.
PAUSE number
How many milliseconds to pause before sending each packet, 0-127, nor-
mally zero. This helps half-duplex systems prepare for reception of
our packet. Padding characters are sent only after the time limit ex-
pires.
QUOTE number
Use the indicated printable character for prefixing (quoting) control
characters and other prefix characters. The only reason to change this
would be for sending a very long file that contains very many "#"
characters (the normal control prefix) as data.
START-OF-PACKET number
Mark the beginning of outbound packets with some control character
other than Control-A. This will be necessary if the remote host or the
communication channel cannot accept a Control-A as data, or if it
echoes back your packets. The remote host must have been given the
corresponding SET RECEIVE START-OF-PACKET command.
TIMEOUT number
Change Kermit-MS's normal timeout interval; this command is effective
only if TIMER is set to be ON; it is normally ON so that both Kermits
can control timeouts. When the timer is ON, the default interval is 13
seconds.
SET SPEED
Syntax: SET SPEED rate
Same as SET BAUD, q.v.
SET TAKE-ECHO
Syntax: SET TAKE-ECHO {ON, OFF}
Specifies whether screen display should occur during implicit or explicit TAKE
operations on MSKERMIT.INI or other Kermit-MS command files, and during evalua-
tion of macro definitions by the DO command. Handy for finding errors in TAKE
files or macro definitions.
SET TERMINAL
Syntax: SET TERMINAL parameter [value]
This command controls most aspects of terminal emulation. Most of the
parameters are only settable (or meaningful) on the IBM PC family and com-
patibles. (Programmers who are proficient on other MS-DOS systems are invited
to fill in these functions for those systems and send the results back to
Columbia.) On other systems, built-in setup modes or DOS commands can be used
to accomplish the same functions.
The first group of parameters tells which kind of terminal to emulate. When
Kermit-MS uses its built-in software for emulation, incoming characters are ex-
amined for screen control commands (escape sequences) specific to that ter-
minal, and if encountered, the commands are executed on the PC screen.
NONE Act as a dumb terminal. All incoming characters will be sent to the
screen "bare", as-is, through DOS. If you have loaded a device driver
into DOS for the CON device, such as ANSI.SYS, then that driver will be
able to interpret the codes itself. Many non-IBM systems have their
own screen control code interpreter built into DOS or firmware, or
available as a loadable device driver.
VT52 The DEC VT-52 terminal.
HEATH The Heath/Zenith-19 terminal (H19), which supports all the VT52 com-
mands, plus line and character insert/delete editing functions, an ANSI
mode, and a 25th line.
VT102 The DEC VT102 (ANSI) terminal, which is the same as a VT100 but also
supports line/character insert/delete editing functions and ANSI
printer controls.
TEK4010 A Tektronix 4010 graphics terminal. Currently only available on IBM,
TI, and Victor PCs. On the IBM family, Kermit automatically senses and
adapts to the CGA, EGA, or Hercules color board.
The specific escape sequences supported by Kermit for each of these terminal
types are listed in section 1.15.1. Note that when a Kermit program includes
Tektronix emulation, this can be invoked automatically while in character mode
(VT102, VT52, or Heath emulation) when the emulator receives certain escape se-
quences. This can be turned off using the DISABLE TEK command.
The remaining SET TERMINAL commands specify setup options for the selected ter-
minal:
CHARACTER-SET {UK, US}
UK displays "#" (ASCII 35, number sign) as a pound sterling sign, US
displays "#" as "#". This command applies during VT100/102 emulation.
COLOR number [, number [, number]]
Several numbers, applied in left to right sequence, separated by commas
or spaces:
0 Reset the colors to normal intensity white characters on a black
background and use the "no-snow" mode on the IBM Color Graphics
Adapter (CGA).
1 High intensity foreground
10 Request fast screen updating for use on the IBM Mono, EGA, or PGA
(usually sensed and set internally by Kermit), and some non-IBM
CGAs.
3x Foreground color
4x Background color
where x is a single digit from 0 to 7, which is the sum of the desired
colors:
1 Red
2 Green
4 Blue
Example: 0, 1, 37, 44 on an IBM CGA would produce bold white characters
on a blue field with no snow. The snow removal business has to do with
whether the program should synchronize with vertical retrace when up-
dating screen memory. This is necessary with certain color adaptors
(like the CGA) and unnecessary for others (like the EGA).
CURSOR-STYLE {BLOCK, UNDERLINE}
Sets the cursor rendition to your preference. Note that on some early
IBM PCs and compatibles, the cursor may not be restored correctly after
escaping back from CONNECT because of a bug in the early IBM BIOS.
KEYCLICK {ON, OFF}
Turns electronic keyclick ON or OFF. If your keyboard has a mechanical
clicker (as IBM boards do), you may not notice the effect of this com-
mand.
MARGIN-BELL {ON, OFF}
Controls whether the bell should be sounded when the cursor passes
column 72 near the right screen margin; wider displays set the bell 8
columns from the right edge.
NEWLINE-MODE {ON, OFF}
ON sends a carriage-return-linefeed combination (CRLF) when you type
carriage return (CR) during terminal emulation. OFF (default) just
sends a CR when you type CR.
ROLL {ON, OFF}
ON unrolls the screen to the bottom before adding new material if the
screen had been rolled back, e.g. by Ctrl-PgUp. ROLL OFF (the default)
displays new material on the current screen, possibly overwriting old
material.
SCREEN-BACKGROUND {NORMAL, REVERSE}
NORMAL means dark background, light characters. REVERSE means light
background, dark characters.
TAB {AT n, CLEAR AT n, CLEAR ALL}
Sets tab stops or clears one or all tab stops; n is the numeric posi-
tion of the tab to be set or cleared. By default, tabs are every 8
spaces, at positions 9, 17, 25, etc. Only meaningful when emulating a
terminal that has settable tabs (the VT52 doesn't really but the
emulator can set them anyway). More than one tabstop may be specified
by separating column numbers with commas, spaces, or tabs. 132 columns
are supported.
WRAP {ON, OFF}
ON automatically breaks screen lines (by inserting a CRLF) when they
reach the right margin. OFF disables wrapping -- if a line is too
long, the excess characters go off the screen. WRAP is OFF by default,
since most hosts format lines to fit on your screen.
SET TIMER
Syntax: SET TIMER {ON, OFF}
This command enables or disables the timer that is used during file transfer to
break deadlocks that occur when expected packets do not arrive. By default,
the timer is ON. If the other Kermit is providing timeouts, you can safely
turn the timer OFF to avoid packet collisions that might occur when two timers
go off simultaneously.
SET TRANSLATION
Syntax: SET TRANSLATION INPUT {ON, OFF, char1 char2}
This command provides multi-language support (and perhaps other special
effects) during CONNECT, and during execution of the INPUT, OUTPUT, PAUSE, and
TRANSMIT script commands, but not during file transfer or at MS-Kermit command
level. A character that arrives at the communication port (char1) will be
translated to another character (char2) before display on the screen. As many
as 256 characters may have translations specified concurrently. But to see
characters with ASCII values higher than 127, you must also SET DISPLAY 8 and
SET PARITY NONE.
SET TRANSLATION INPUT ON enables translation (the keyword INPUT is required to
allow future translation mechanisms). OFF disables the translation and is the
default. So even if you have set up a translation table, you must SET TRANS-
LATION INPUT ON before it will take effect. SHOW TRANSLATION tells whether
translation is OFF or ON, and displays any current table entries.
Translation table entries are made by specifying byte pairs in ASCII or numeric
backslash form:
SET TRANS INPUT \3 \13
converts incoming ASCII ETX characters (decimal 3) to ASCII CR (decimal 13).
8-bit values are allowed, and refer to characters in the "upper half" of the
PC's character set, either the ROM characters supplied with the PC or else sub-
stitutions provided by a special device driver.
A more practical example shows how the user of a German PC could use the SET
TRANSLATION and SET KEY commands to make the PC's umlaut-a key (key code 132)
send a left curly brace ("{", ASCII 123), and to display incoming curly braces
as umlaut-a's:
SET KEY \d132 \d123
SET TRANS INP { \d132
(This example applies to the IBM PC German keyboard, and assumes the German
keyboard driver, KEYBGR, has been loaded. This is usually done in
AUTOEXEC.BAT.)
SET WARNING
Syntax: SET WARNING {ON, OFF}
Specify what to do when an incoming file is about to be stored under the same
name as an existing file in the target device and directory. If ON, Kermit
will warn you when an incoming file has the same name as an existing file, and
automatically rename the incoming file (as indicated in the warning message) so
as not to destroy (overwrite) any existing one. If OFF, the pre-existing file
is destroyed, even if the incoming file does not arrive completely. WARNING is
ON by default as a safety measure.
The new name is formed by adding numbers to the part of the name before the
dot. For instance, ABC.TXT becomes ABC00001.TXT, ABC00001.TXT becomes
ABC00002.TXT, etc.
The STATUS Command
Syntax: STATUS
The STATUS command displays the values of all the current SET options. There
are currently no operands for the STATUS command. It always displays all the
options, and the display fills the screen.
The SHOW Command
Syntax: SHOW option
Most parameters that may be altered with SET commands are displayed by the
STATUS command. The SHOW command is used for displaying macro definitions, key
redefinitions, file transfer statistics, and translations.
SHOW MACROS
displays the definitions of all currently defined macros, as well as
the amount of space left for new macro definitions.
SHOW KEY
allows you to determine a key's identification code and what it will
send in CONNECT mode, most useful for obtaining the identification of a
key when SET KEY commands will be placed in a TAKE FILE. This command
can be done only interactively (use a ? to see all defined keys).
Refer to the terminal emulation section for examples.
SHOW MODEM
displays the status of the modem signals DSR (dataset ready, modem
tells the PC that it is turned on and in data mode), CTS (clear to
send, modem grants the PC permission to send data), and CD (carrier
detect, local modem tells the PC that it is connected to the remote
modem). The results may be misleading if your asynchronous adapter, or
the connector or cable that is attached to it, is strapped to supply
these modem signals itself.
SHOW STATISTICS
displays counts of characters sent and received during file transfers,
for both the most recent transfer and the entire session, and an es-
timate of the average baud rate while sending and listening.
SHOW TRANSLATION
displays the entries in the 256 byte input translation table. Values
are expressed numerically to avoid confusion with different display
adapters, and the command shows only entries for which input and output
codes differ.
1.7. SCRIPTS
A script is a file containing Kermit commands to be executed. It is the same
as a TAKE file, in Kermit terminology, but includes INPUT, OUTPUT, PAUSE, ECHO,
and CLEAR commands to automatically detect and respond to information flowing
though the serial port, actions which otherwise would be performed by the user
during CONNECT. The login sequence of a host computer is a classical example.
The script commands INPUT, OUTPUT, PAUSE, and ECHO may be terminated by typing
Control-C at the keyboard.
The CLEAR command
Syntax: CLEAR
The CLEAR command flushes the buffers of the serial port to forget any earlier
material to help the INPUT command with a clean start. (This command was
called CLRINP in 2.29B and earlier, and CLEAR was used to erase macro and key
definition memory).
The INPUT command
Syntax: INPUT [timeout] {search-string | @filespec}
INPUT is the most powerful of the script commands. It reads characters from
the serial port continuously until one of two things occurs: the received
characters match the search string or the time limit expires. Matching strings
is the normal use, as in
Kermit-MS>input 5 Login please:
to recognize the phrase "Login please:", or else time out after trying for 5
seconds. A special binary character \255 or \o377 or \xFF stands for the com-
bination carriage return and a line feed, in either order, to simplify pattern
matching.
Beware of characters arriving with parity set because the pattern matching con-
siders all 8 bits of a byte unless the local parity is other than NONE and SET
DISPLAY is 7-BITS. Arriving characters are modified by first removing the
parity bit, if parity is other than NONE, then they are passed through the SET
TRANSLATION INPUT converter, the high bit is again suppressed if SET DISPLAY is
7-BITs, the result is logged and stored for pattern matching.
The INPUT and OUTPUT commands have a special syntax to replace the normal
string with text obtained from a file or device:
OUTPUT @filespec
INPUT @filespec
Both forms read one line of text from the file or device and use it as the
desired string. A common use is to wait for a password prompt and then read
the password from the console keyboard. A string starts with the first
non-spacing character and ends at either the end of line or, if executed within
a TAKE file, at a semicolon. Indirectly obtained strings, the @filespec form,
read the first line of the file up to but not including the explicit carriage
return. Note if a trailing carriage return is needed it must be expressed
numerically, such as \13 decimal.
The behavior of the INPUT command can be controlled by SET INPUT parameters:
CASE, TIMEOUT-ACTION, DEFAULT-TIMEOUT, and ECHO. If the TIMEOUT-ACTION is
PROCEED then failure to match strings is ignored and the script continues with
the next command. Otherwise, QUIT causes the current script file to be exited
immediately; the next higher level script file or the Kermit prompt is done
next. CASE controls whether upper and lower case letters should be considered
the same during matching. DEFAULT-TIMEOUT supplies a different default for how
long to wait, in case an explicit value is not given in the INPUT command.
Finally, ECHO controls displaying of serial port data during matching and
during the other script commands.
When a script fails because an INPUT command did not encounter the desired
string within the timeout interval, the message is "?Not confirmed".
The OUTPUT command
Syntax: OUTPUT {string | @filespec}
The OUTPUT command writes the indicated character string to the serial port as
ordinary text. The string may contain control or other special binary charac-
ters by representing them in the backslash numerical form. Carriage Return
(CR), for example, is \13 decimal, \o15 octal, or \x0D hexadecimal. The string
may use 8-bit characters if the communications parity is type NONE.
The OUTPUT string may not contain Kermit CONNECT-mode action verbs, but it does
recognize a special code \b or \B, which causes a BREAK signal to be trans-
mitted.
The string to be transmitted starts with the first non-spacing character after
the OUTPUT command and ends at either the end of line or, if executed within a
TAKE file, at a semicolon (if you need to output a semicolon from within a TAKE
file, use backslash notation, e.g. "\59"). Indirectly obtained strings, the
@filespec form, read the first line of the file up to but not including the ex-
plicit carriage return.
As a convenience, text arriving at the serial port during the OUTPUT command is
shown on the screen if SET INPUT-ECHO is ON, and stored in a 128-byte internal
buffer for rereading by a following INPUT command.
The PAUSE command
Syntax: PAUSE [number]
PAUSE simply waits one or more seconds before Kermit executes the next script
command. Pauses are frequently necessary to avoid overdriving the host and to
let a modem proceed through a dialing sequence without interruptions from Ker-
mit. The default waiting time is set by SET INPUT DEFAULT-TIMEOUT and is nor-
mally one second. The optional integer number selects the number of seconds to
pause for this command. An explicit value of zero produces a pause of just a
few milliseconds which can be useful in some situations.
Text arriving during the PAUSE interval is shown on the screen, if SET
INPUT-ECHO is ON, and stored in a 128-byte internal buffer for rereading by a
following INPUT command.
Script Examples
Figure 1-2 shows a simple script file that dials a Hayes modem and logs in to a
computer, prompting the user for her password, and then connects as a terminal.
-------------------------------------------------------------------------------
CLEAR
SET SPEED 1200
OUTPUT AT\13 ; Wakeup modem.
PAUSE 2 ; Let it get ready.
INPUT OK ; Its response.
OUTPUT ATDT 9,555-1212\13 ; Dial the phone.
INPUT 30 CONNECT ; Wait for connection.
PAUSE 2 ; Breathing space for modems.
OUTPUT \13 ; Send carriage returns to
PAUSE 2 ; awaken host, wait 2 secs
OUTPUT \13 ; between them.
INPUT 15 Please login: ; Get expected prompt.
OUTPUT Sari\13 ; Send username and CR.
SET INPUT ECHO OFF ; Privacy, please.
INPUT Enter password: ; Quietly wait for this.
ECHO Type your password now. ; Make our own prompt.
OUTPUT @CON ; Send console keystrokes.
OUTPUT \13 ; Add a real carriage return
SET INPUT ECHO ON ; Go verbose again.
CONNECT ; Start terminal emulation
Figure 1-2: MS-Kermit Script for Dialing Up and Logging In
-------------------------------------------------------------------------------
Notice the semicolons used to indicate comments in TAKE files. If these same
commands were typed by hand at the Kermit prompt the semicolon material would
be considered part of a string! Typing a Control-C will interrupt and ter-
minate any of the commands.
The MS-Kermit script package maintains a small memory buffer to allow the INPUT
command to inspect characters received during the previous few script commands.
CLEAR removes them and any others in a lower level main serial port buffer.
As with any TAKE file, scripts can be nested by using the TAKE command within a
script. If an INPUT command fails to obtain a match and uses the QUIT option
or if the script simply finishes normally the TAKE file is exited and control
resumes where it left off in the next higher TAKE file or at the Kermit prompt.
A slightly more complicated combination of DOS Batch and Kermit Script files is
shown in Figures 1-3 and 1-4 (see your DOS manual for an explanation of the
batch file syntax). The purpose is to allow a user to say "SEND filename" at
the DOS prompt. The DOS batch shell, SEND.BAT, and the login script, KX, are
combined to login to a VAX through a data switch, run VMS Kermit in server
mode, transfer the file, submit it to VMS Mail, delete the disk file, shut down
the server and logout from the VAX, and report the overall transfer status.
The user is asked to provide a password interactively. Scripts are illustrated
further in the next section.
-------------------------------------------------------------------------------
File SEND.BAT, DOS batch program:
echo off
Rem Kermit, one-line file mailer, by Joe Doupnik.
Rem Logon to VAX, run Kermit, Send user's file,
Rem post via MAIL, logout from VAX.
if ".%2" == "." goto usage
if exist %1 goto proceed
echo No file to send!
:usage
echo Usage is SEND filename username
goto done
:proceed
echo Logging onto the Vax ...
kermit set disp q,take kx,send %1,pau,rem host mail %1 %2,pau 2,bye,
if errorlevel 3 goto badrem
if errorlevel 2 goto badrcv
if errorlevel 1 goto badsnd
echo File(s) "%1" has been mailed to %2.
goto done
:badrem
echo Mail did not cooperate!
:badrcv
echo Receive failed!
goto done
:badsnd
echo Send failed!
goto done
:done
echo on
Figure 1-3: MS-DOS Batch File Invoking Kermit to Send VAX Mail
-------------------------------------------------------------------------------
1.8. Initialization Files Revisited
At Columbia University, we have IBM 370-series mainframes running VM/CMS,
DECSYSTEM-20 mainframes running TOPS-20, a VAX 8700 running Unix. All of these
systems are accessible through a Gandalf PACX port contention unit. The IBM
systems have two different kinds of front ends, a COMTEN 3695 (similar to IBM
3705) for linemode half-duplex connections, and various Series/1-style protocol
converters (including the 7171 and 4994) for full-screen, full-duplex 3270
emulation, all of which use various combinations of parity and other settings.
Figure 1-5 shows an MSKERMIT.INI file composed by Vace Kundakci of Columbia to
automate the task of switching his PC/AT among all these systems. It il-
lustrates the creative use of macros and scripts. Numerous site- and system-
dependent key definitions have been omitted.
A bit of explanation might clarify some of this. PACX is our port contention
unit. Its output appears in even parity. It prompts us to "Enter node name
=>", and we respond with the name of one of our systems or front ends, like
CU20B or CU20D (DEC-20s), SIMA or SIMB (7171s), CUVMA or CUVMB (IBM mainframes
front ended by COMTEN), or CUNIXC (a VAX). To connect to a given system, Vace
types "do cu20b" or "do sima" to invoke a "connecting" macro. Each of these,
in turn, invokes the PACX macro to navigate through the PACX to the desired
system, and then invokes the appropriate macro (3695, 7171, etc) to get past
any associated front end (e.g. to tell the COMTEN which IBM mainframe is
wanted, or to tell the protocol converter what terminal to emulate), and then
to login on the desired system, prompting on the screen for user ID and
password. Finally, a macro like "vml" (VM linemode), "xed" (XEDIT, i.e. VM
full screen), or "dec" (DEC-20 or VAX) is executed to set the communication
parameters for the system just logged in to. The key definitions that are
shown in the "vml", "xed", and "dec" macros assign the host's character dele-
tion code (backspace or rubout) to the AT's backarrow key.
1.9. MS-Kermit Features for Different Systems
As noted early on, MS-Kermit was designed primarily for the IBM PC family, and
later adapted to various non-IBM-compatible MS-DOS (and even non-MS-DOS) sys-
tems. Some of these adaptations provide all the features of the IBM PC ver-
sion, others provide only a subset, and still others may include features not
available on the IBM family. These features are all of the system-dependent
variety; the Kermit file transfer protocol should be implemented identically on
all versions of MS-Kermit. The most obvious differences are in the terminal
emulation options and the keyboards. Table 1-5 shows the terminal emulation
options for the systems presently supported by Kermit-MS, and Table 1-6, shows
which keys are used for screen rollback on the various systems supported by
MS-Kermit.
-------------------------------------------------------------------------------
File KX, Kermit script:
Comment Login script for VAXA via Micom data PBX Switch.
set input timeout quit
set input echo off
set display quiet
output \13
comment - "slowly." and "CLASS" are part of the switch's prompt.
input 10 slowly.
input 10 CLASS
pause
comment - Slowly tell switch "vaxa", wait for beep.
output v
output a
output x
output a
output \13
pause
input 5 \7
comment - Done with Switch, wake up the VAX and log in.
pause
output \13
pause
input 5 Username:
set input timeout proceed
output MYNAME\13
input 2 Password:
comment - Prompt ourselves, then get password from console.
echo Enter password:
output @con
comment - Send a carriage return at the end of the password.
output \13
comment - Expect ESC Z from the VAX's Set Term/Inquire...
comment - Respond ESC [ <query symbol> 6 ; 2 c (say we are VT102).
comment - Note syntax for including question mark and semicolon!
input 15 \27Z
output \27[\{63}6\;2c
comment Look for VMS dollar sign prompt
input 15 $
comment Start VMS Kermit and place it in server mode
output kermit server\13
comment - allow server's message to finish, "machine." appears twice.
input 10 machine.
input 10 machine.
pause
Figure 1-4: MS-Kermit Script for Logging into VAX and Sending Mail
-------------------------------------------------------------------------------
-------------------------------------------------------------------------------
; MSKERMIT.INI for IBM PC/AT Kermit 2.30, by Vace Kundakci
COMMENT - INPUT command defaults for scripts
set inp tim quit
set inp echo off
set inp case observe
COMMENT - Macros for connecting to PACX and selecting various systems
def cu20b do pacx,o cu20b\13,do 2065
def cu20d do pacx,o cu20d\13,do 2065
def sima do pacx,o sima\13,do 7171
def simb do pacx,o simb\13,do 4994
def cunixc do pacx,o cunixc\13,do 8700
def cuvma do pacx,o cuvm\13,do 3695,o vma\13,do 3083
def cuvmb do pacx,o cuvm\13,do 3695,o vmb\13,do 3083
COMMENT - Macros for logging in to various systems.
def pacx cle,set par e,o \13,i 5 Enter node name =>\32,pau
def 3695 i 5 SWITCHING CHARACTERS:\32\32
def 3083 i 5 ONLINE,o L\32,do pwd,do vml,c
def 8700 i 5 login:\32,do pwd,do dec,c
def 2065 i 5 \13\10\64,o ter vt102\13,do pwd,do dec,c
def 7171 pau,cle,o \13,i 5 TERMINAL TYPE:\32,o vt-100\13,do 3270
def 4994 pau,cle,o \13,i 5 terminal type:\32,pau,o vt100\13,do 3270
def 3270 pau,cle,o \13,o L\32,do pwd,do xed,c
COMMENT - Macros for communicating with various systems
def vml set par m,set k \270 \8,set k \3 \Kbreak,do tty
def xed set par e,set k \270 \8,set k \3,do def
def dec set par n,set k \270 \127,set k \3,do def
def def set tim of,set loc of,set ter wr of,set han non,set flo xon
def tty set tim on,set loc on,set ter wr on,set han xon,set flo non
COMMENT - Macro for obtaining user ID and password
def pwd echo user:,o @con,o \13, do pw2
def pw2 echo Password:,o @con,o \13
Figure 1-5: An Advanced MS-Kermit Initialization File
-------------------------------------------------------------------------------
-------------------------------------------------------------------------------
System EscChar Capabilities Terminal Service
ACT Apricot ^] K VT52 ???
DEC Rainbow ^] R P K D VT102 firmware
DECmate/DOS ^] K VT100
Generic DOS ^] K Depends on system
Grid Compass ^] K ???
HP-110 ^] K Dumb terminal
HP-150 ^] R K HP-2623 firmware
IBM PC family ^] R M P K D H19,VT52,VT102,Tek emulation
Intel 3xx ^] K Uses real terminal
NEC APC3 ^] R M P K D H19,VT52,VT102 emulation
NEC APC ^] R P K VT100, ADM3A firmware
Olivetti M24 ^] R M P K D Same as IBM PC
Sanyo MBC55x ^] R M P K D H19,VT52,VT102 emulation
Wang PC ^A K Wang firmware
TI Pro ^] M P K VT100/Tektronix
Victor 9000 Alt-] M P K D H19,VT52,VT102 and/or Tek4010
Zenith Z100 ^] K Heath-19 emulation
R=Rollback, M=Modeline, P=Printer control, K=Key redefinition, D=screen Dump
Table 1-5: Kermit-MS Terminal Emulation Options
-------------------------------------------------------------------------------
-------------------------------------------------------------------------------
System Screen Down Line Down Screen Up Line Up
IBM PC PgUp Ctrl-PgUp PgDn Ctrl-PgDn
Rainbow PrevScreen Ctrl-PrevScreen NextScreen Ctrl-NextScreen
HP-150 Prev Shift-UpArrow Next Shift-DownArrow
NEC APC Uparrow Ctrl-UpArrow DownArrow Ctrl-DownArrow
NEC APC3 PgUp Ctrl-PgUp PgDn Ctrl-PgDn
Sanyo 55x PgUp Ctrl-RtArrow PgDn Ctrl-PgDn
The IBM PC also allows use of the Home key to get to the top of its display
memory and End key to get to the bottom, and the keypad minus (-) key to toggle
the mode line on and off. The Rainbow uses Shift-Next-Screen to get to the
bottom of its display memory, but provides no key for moving directly to the
top.
Table 1-6: Kermit-MS Screen Scroll Keys
-------------------------------------------------------------------------------
Another difference is the default communication port, the number of communica-
tion ports supported, and the names given to them. For instance, the IBM PC
family supports COM1 and COM2, and uses COM1 by default. MS-Kermit may be per-
suaded to support higher-numbered IBM ports using the method outlined in sec-
tion 1.16.3. For remote operation, IBM's name for the console is CON, so if
you CTTY COM1, you do CTTY CON to put the PC back to normal.
The DEC Rainbow
The DEC Rainbow version of MS-Kermit 2.30 uses the built-in VT102 terminal
firmware and setup modes, and can operate at speeds up to 9600 baud. It has no
25th screen line, and therefore no Kermit mode line during CONNECT. It sup-
ports only the Rainbow's single communication port, and not the printer port,
so SET PORT for the Rainbow is not implemented (but of course the printer may
be used for printing.) The Rainbow may be put in remote mode by CTTY AUX, and
returned to normal with CTTY SCRN. The Rainbow supports several SET TERMINAL
commands: VT102, VT52, and ROLL.
The keypad and cursor keys all work properly in VT102 and VT52 modes and in ap-
plication as well as native states (they never had in previous versions).
Newline mode is activated for received characters (LF ==> CR/LF). Screen roll
back is almost 11 screenfuls. Table 1-7 shows the verb names and default key
assignments for the Rainbow. On the main typewriter keyboard the shifted comma
and period are converted to special keys available for Set Key assignment with-
out impacting the normal unshifted ASCII actions; Shift Lock has no effect on
these keys.
The DECmate II
MS-Kermit for the DECmate II with the XPU option is somewhat similar to Rainbow
Kermit. It uses built-in terminal VT100 firmware and setup modes and baud
rates up to 9600 on the single communication port. The printer port is not
available for communications in this version. There is no mode line, but other
connect-mode escapes are supported, including sending BREAK. Disks A through I
are supported, and the floppy disk format is compatible with the Rainbow. DEC
utilities are available for file conversion between DOS and WPS-8 files.
The NEC APC3
The NEC APC3 version of MS-Kermit assumes that the ANSI.SYS driver has been in-
stalled and that a color monitor is being used; the color graphics option is
not used by Kermit. Although the display should be entirely sensible with a
monochrome system, it has not been tested. Differences from the IBM PC version
include:
SET BAUD: The useful baud rates supported range from 300 to 96