home
***
CD-ROM
|
disk
|
FTP
|
other
***
search
/
Columbia Kermit
/
kermit.zip
/
e
/
newsn3.txt
< prev
next >
Wrap
Text File
|
2020-01-01
|
37KB
|
687 lines
KERMIT NEWS
Volume 3, Number 1
June, 1988
Kermit News is published periodically free of charge by Columbia University,
Center for Computing Activities, 612 West 115th Street, New York, NY 10025,
USA, phone 212-280-3703.
Editor: Christine Gianone
The Kermit file transfer protocol is named after Kermit the Frog, star of the
television series The Muppet Show, used by permission of Henson Associates,
Inc.
EDITOR'S NOTES
Christine Gianone
Columbia University, New York City
Welcome to the third issue of Kermit News. This newsletter is published
whenever enough news is gathered to report, and time permits. The two previous
issues were Volume 1, Number 1 (July 1986) and Volume 2, Number 1 (November
1987). We hope to publish the newsletter more frequently in the future.
The Kermit newsletter attempts to inform Kermit users of new developments and
report on some of the varied Kermit uses. Readers who are using Kermit in
especially unusual, interesting, or beneficial ways are encouraged to submit
articles of about 500 words for publication in future issues. Testimonials
from satisfied Kermit users are always welcome too.
Everyone is permitted to copy and redistribute Kermit programs so long as it is
not done for profit. If you make fixes, changes, improvements, or write new
documentation of general interest, or especially if you develop a Kermit
program for a system that didn't have one before, you are encouraged to send
your work back to Columbia University so that we can maintain a definitive and
comprehensive set of Kermit implementations for further distribution.
Product News
New versions and releases of Kermit programs are continually appearing, as you
will see in the sections "Summary of Recent Releases" (page 9) and "Major New
Releases" (page 3). In some cases, a single portable version is able to
replace several more specific versions, as reported in the "Portable 370
Kermit" article (page 3). Kermit is currently available for over 300 different
computers and operating systems.
DEC's large systems, the DECsystem-10 and DECSYSTEM-20, have begun to sail
smoothly into eternity. Our own DEC-20, CU20B, home of Kermit Distribution
since its beginning in 1981, will be retired this Fall. After that time we
will no longer be able to provide DEC-20 DUMPER or DEC-10 BACKUP/Interchange
format tapes! If you need tapes in this format, this is your last chance to
order. This offer expires September 1, 1988.
By popular demand, we have added some new items and formats to our catalog,
which you may select on the enclosed order form:
- DEC MicroVAX TK50 tape cartridges. These should also be readable on TK70
drives. Available for both VAX/VMS and Ultrix-32. Cartridge #1 holds Tapes
A, B, and E; Cartridge #2 has Tapes C, D, and E.
- DEC MicroVAX RX50 diskettes for VMS and Ultrix. These should also be
readable on RX33 drives. Executables, utilities, and documentation for VMS
or Ultrix Kermit are included.
- IBM PC MS-DOS Kermit source diskettes available on IBM PC 5 1/4-inch 360K
and PS/2 formatted 3.5-inch 720K diskettes.
- UNIX C-Kermit source on IBM PC 5 1/4-inch diskettes. These are especially
useful for Xenix users on PC/AT's or similar systems.
- MacKermit C source on Macintosh formatted 3.5-inch diskettes.
Thanks to Digital Equipment Corporation for an equipment grant that allows us
to make the MicroVAX TK50s and RX50s, and to International Business Machines
for providing a PS/2 for 3.5-inch and 5 1/4-inch diskette production.
Disk Volunteers Needed
At Columbia University, we try to meet the demand for Kermit programs in a
variety of tape and diskette formats. Since we don't have one of every kind of
computer to make disks and tapes on, we take every opportunity to ask
public-spirited volunteers to come forward and make Kermit available on native
media for the kinds of computers we don't have: Acorn, Apple II, Apricot, Alpha
Micro, Altos, Amstrad, Apollo, AT&T 3Bx, Atari . . . And those are just the
A's!
In the Summary of Recent Releases on the inside back cover you will see some of
our current diskette and tape volunteers. If you would like to add your name
to the list, please contact Kermit Distribution. Even better, perhaps, if you
know of a user group for your kind of computer that does non-profit mail-order
software distribution, please submit Kermit to them and let us know.
Have Kermit, Will Travel
Frank da Cruz and I have developed a series of Kermit seminars aimed for
audiences ranging from novice to experienced. People in the New York City area
may attend our courses at Columbia University's Division of Special Programs.
Organizations outside of New York as well as local companies who would prefer
in-house training might be interested to know that we have recently begun to
take Kermit "on the road".
In November, 1987, Frank and I were invited to Tokyo to teach a Kermit course
and give a Kermit presentation at Japan DECUS (Digital Equipment Corporation
User Society). The course, Fast-Paced Introduction to Kermit, was conducted in
English with Japanese translation. It covered the basics of terminal emulation
and file transfer between MS-DOS PCs and VAX/VMS, with a brief introduction to
RS-232 asynchronous data communication and modems, and techniques for
troubleshooting.
The presentation, Kermit: Current Status and Future Directions, was similar to
the one prepared for Nashville DECUS in April 1987, except for the UN-style
simultaneous translation and headphones, the guest speakers, and the news
itself. We discussed Kermit's history, design and philosophy, gave a brief
overview of the major new releases, and talked about Kermit performance issues
and how they are addressed by compression, long packets, and sliding windows.
Then Japan's "Kermit-san," Ken-Ichiro Murakami of NTT, spoke on special
considerations for Japanese Kermits: implementations for Japanese computers,
translation among the many computer representations for the different forms of
Japanese text (Kana, Kanji, Romaji), Japanese-language Kermit documentation,
and Kermit distribution in Japan. We were charmed by the generous hospitality
of our hosts, and gratified by the high level of interest in, knowledge of, and
support for Kermit in Japan. Many thanks to Kohichi Nishimoto, Administrator
of Japan DECUS, for sponsoring the trip.
In March of this year, we were invited to Switzerland DECUS at St. Gallen to
conduct a course, Advanced Kermit: Use, Installation, and Support, designed for
computer professionals who are responsible for Kermit within their
organizations. Unlike Japan, Switzerland has no common language, so Swiss
DECUS is conducted in English. The all-day course was quite successful, and
well-attended despite the blizzard outside. The topics ranged from tutorials
in Kermit use and data communications to customization via script construction
and key redefinition, illustrated using a MicroVAX 2000 and a Toshiba laptop
connected to a projection screen. We are grateful to David Guerlet, Swiss
DECUS Chairman, for the invitation and for his gracious hospitality. Course
handouts included the new MS-DOS Kermit 2.30 and manual, plus MS-DOS Kermit
documentation translated into German by Gisbert W. Selke of the
Wissenschaftliches Institut der Ortskrankenkassen in Bonn, whom we had the
opportunity to meet with in Ludwigsburg, West Germany.
Later in the month we met with the "Club Kermit" board of directors in Paris.
Club Kermit is a non-profit association, founded by Jean Dutertre, devoted to
the distribution and promulgation of Kermit in France. Club Kermit may be
contacted at 9 Av. Vergriand, 78600 Maisons Laffitte, France.
The entire Kermit Distribution collection was presented to both Japan and
Switzerland DECUS, as well as to Club Kermit in France.
KERMIT DOCUMENTATION
Kermit manuals have been translated into Japanese, French, German, Italian,
Hungarian and Portuguese, but so far we have only the Portuguese available
online, plus some German help files. If you have machine-readable
translations, please send them in!
Kermit User Guide, 7th Edition (May 1988). Detailed instructions for use of
selected Kermit programs. New chapters for MS-DOS Kermit 2.30, UNIX Kermit 4E,
IBM 370 Kermit 4.0 for VM/CMS and MVS/TSO, VAX/VMS Kermit 3.3, DEC-20 Kermit
4.2, PDP-11 Kermit 3.58, Apple II Kermit 3.81, Macintosh Kermit 0.9, and
CP/M-80 Kermit 4.09. The printed version is typeset, with boldface, italics,
underlining, etc, used to clarify the examples. The 7th edition of the User
Guide is much thicker than the 6th, hence the higher price. Selected chapters
are available separately: MS-DOS, Macintosh, UNIX, VMS.
Kermit, A File Transfer Protocol, by Frank da Cruz, Digital Press (1987). An
introduction to, and comprehensive reference on, Kermit: its purpose, its use,
its commands, its design. Complete with tables, illustrations, tutorials,
appendices, a glossary, etc, as well as a troubleshooting guide and a complete
specification of the Kermit protocol, with programming examples in the C
language. Review clips:
- " . . . an unprecedented, self-contained book about a media-independent
point-to-point 'filegram' protocol that is robust and adaptable to a wide
variety of systems . . . an excellent reference source." -J. Klaczak, ACM
Computing Reviews, March 1988
- " . . . addresses the needs of a full spectrum of users, from the computer
semiliterate who has only used 'canned' programs, to the experienced user who
merely wants to learn the Kermit command set, to the programmer who wants to
implement Kermit on a new computer. [It is] a friendly book that puts you at
ease with amusing and informative illustrations." -James Heliotis, IEEE
Computer, December 1987
- " . . . highly recommended, not only for its KERMIT information, but also
for the first 100 pages, which are one of the finest discussion of data
communications anywhere." -Merv Adrian, "The Workstation Data Link",
McGraw-Hill (1988)
Info-Kermit Digest, 1985-present. This is the electronic Kermit newsletter,
issued approximately twice monthly, to thousands of readers on the
international academic computer networks BITNET/EARN, CSNET, CCNET, etc, with
contributions from Kermit users and developers all over the world. Printed
versions are now available, paginated and indexed for easy reference. Included
are announcements of new releases, discussions of proposed new features of the
protocol, problems and solutions.
MAJOR NEW RELEASES
MS-DOS KERMIT 2.31
Short on the heels of version 2.30 of MS-DOS Kermit comes another new release,
this time 2.31, also from Professor Joe R. Doupnik of Utah State University.
But before talking about 2.31, let's correct a major omission in the
announcement of 2.30 in the last issue: Tektronix graphics terminal emulation.
IBM PC Kermit 2.30 and later includes emulation of the Tek 4010, plus some 4014
line drawing features, on most popular displays, including CGA, EGA, Hercules,
Olivetti, AT&T, and even character-mode simulation on systems with no graphics
boards at all!
Major new features for version 2.31 include expanded support for local area
networks (see article on page 4), and new support for Kermit file attribute
packets, so that file sizes, creation dates, and other information can be
conveyed along with the file itself (page 6). And there's now a transaction
log, so that you can come back after a long unattended file transfer session
and find out what happened.
But the biggest change for 2.31 is in the script and macro language. It is now
possible to define variables, to call macros with parameters, to construct
loops, to perform conditional GOTOs, to reexamine previous INPUT strings, to
delay operations until a predetermined time of day, and much more.
Thanks once again to Joe for his excellent work and generous spirit, and to the
many beta testers for bug reports and fixes. MS-Kermit 2.31 is available on
Tape A, prefix MS, and on diskette.
Since MS-DOS Kermit runs on so many different machines, not all versions are
updated at once. IBM PCs and compatibles are done first, with other systems
like Rainbow, Sanyo, HP, NEC, and Victor following later. As of press time,
version 2.31 is available only for the IBM's and compatibles, the DEC Rainbow,
the HP-150, and "generic MS-DOS."
MACINTOSH KERMIT 0.9(40)
Macintosh Kermit 0.9(40), by Paul Placeway of Ohio State University and
Matthias Aebi of ECOFIN Research and Consulting, Ltd, Zuerich, based on
Columbia's original MacKermit, was released in May 1988. MacKermit 0.9(40)
runs on all Macs except the 128K original, for which the previous release,
0.8(34), is still available.
As of 0.9, MacKermit has been translated into Apple MPW C, so that it can be
edited, compiled, and built on the Macintosh itself. Previous versions had to
be cross-compiled on a Unix system. MacKermit's new features include correct
operation on the Mac II and SE; compatibility with all Macintosh keyboards;
long packet support; a built-in, expanded key redefinition function; expanded
server operation; multifile (folder) send; screen capture; transaction logging;
Multifinder support; improved VT102 emulation, including the addition of smooth
scrolling; and a new manual.
Thanks to everyone who tested different prereleases of this program since last
October, and apologies to those of you who ordered MacKermit from us in the
last several months and received a 0.9(36) beta-test copy without an up-to-date
manual. And many thanks to Paul and Matthias for putting this release together
and making it available. Both the new MacKermit and the old MacKermit (version
0.8(34) for the 128K Macintosh) are available on Tape B, prefix CK, and on
Macintosh diskette.
KERMIT-370 4.0 FOR CMS & TSO
Portable IBM 370 Kermit was described by John Chandler of Harvard University in
the last issue of the newsletter. Since then, this program has been released
for both VM/CMS and MVS/TSO systems. It is a very advanced Kermit
implementation, operating in both the linemode (3705) and full-screen
3270-emulation environments with a variety of protocol emulators, including the
IBM Series/1, 4994, and 7171, as well as several non-IBM models.
Kermit-370 retires several redundant versions of TSO and CMS Kermit, in
particular the venerable 1.0 for TSO, which had separate incarnations for each
of several types of front ends. Kermit-370 is available on Tape B, with file
prefix IK. It is distributed in IBM 370 assembly language source form, with
complete assembly and installation instructions.
CP/M-80 KERMIT 4.09
This is the first new release of CP/M-80 Kermit since February 1985, when
Charles Carvalho updated Columbia's original CP/M Kermit program to consolidate
support for different systems and to add some new features. This process has
been carried forward by Bertil Schou of Loughborough University in the UK, who
has further modularized the program, improved its performance, added support
for many new systems, and put in some new features too. Version 4.09 supports
more than 60 different CP/M systems, ranging from the Kaypros and Osbornes, to
various British micros, to the homemade models from the BYTE Magazine Circuit
Cellar.
New features for this version include a selection of terminal emulations;
standardized file transfer command syntax; command-line arguments; command and
initialization files; TYPE, PRINT, and COPY commands; increased speed on
DIRECTORY and wildcard SEND operations. The program is written in 8080
assembly language, and can be assembled using LASM or the Microsoft M80
assembler.
Many thanks to Bertil for this long-term effort, to Alan Phillips and Steve
Jenkins at Lancaster University for sending this new version to us via
transoceanic magnetic tape, and to the many others in the UK and elsewhere who
contributed to the new release. CP/M-80 Kermit 4.09 is available on Tape A,
prefix CP. As always, diskette volunteers and user-group diskette distribution
are welcome!
CONTRIBUTIONS
MS-Kermit on Local Area Networks
Joe R. Doupnik
Utah State University
About one year ago Local Area Network support was incorporated in MS Kermit for
IBM PCs, thanks to support and advice from AT&T. In contrast to the common use
of LANs to connect workstations to network fileservers, Kermit uses the LAN to
talk to other Kermits or to selected mainframe hosts; this is called
peer-to-peer or any-to-any communications. The same MS Kermit program for IBM
PC's which happily talks over a modem or a direct RS-232 connection can also
use almost all popular LANs. These days when offices are wired for LANs but
not RS-232, it is nice to know that Kermit can exploit the new high speed
technology.
How does Kermit connect to a Local Area Network? Three kinds of network
connections can be made. The first kind is through the industry standard
NetBios interface (interrupt 5CH) which is supplied with virtually all current
LAN systems. The Kermit command
SET PORT NET host-name
selects the LAN's NetBios channel, rather than the familiar serial port, and
attempts to connect to the named host system. That is the only Kermit command
which distinguishes network from serial port operations; everything else is
exactly the same. All the LAN-specific work is carefully hidden behind the
scenes and operates automatically. A BREAK signal can even be sent across
STARLAN and Ungermann-Bass systems.
NetBios systems use names for each station and each active Kermit makes a
unique name for itself. Connections to other Kermits are done by name. This
technique works well even on LAN systems such as Novell Netware which do not
otherwise really use NetBios names.
The second connection method is to send and receive through a vendor-supplied
intercept package which masquerades as a serial port. Many LANs and X.25
systems provide such packages. The Kermit command
SET PORT BIOSn (n = 1..4)
tells Kermit to use the system Bios so that the interceptor can capture
traffic. Commonly, one "logs on" to the network package by behaving as a
terminal (Kermit's Connect mode) and telling the interceptor the name of remote
host, terminal type, and so forth according to the rules of the LAN system.
Thereafter, Kermit operations are the same as using a modem or wired line.
(BIOSn support requires 2.31.)
A third connection method is the Ungermann-Bass NetOne LAN system through UB's
specialized NETCI (interrupt 6BH) LAN calls. The Kermit command
SET PORT UB-NET1
starts such a connection. Further "logon" commands are issued from Kermit's
terminal emulator. UB support was provided by Rene Rehmann in Switzerland, and
Henrik Levkowetz in Sweden. This kind of connection directs traffic to an
outgoing bridge which simulates ordinary asynchronous character terminal
activity to modems and other computers. (NetOne support is available only in
Kermit version 2.31.)
What can MS Kermit do across a LAN? First, it works fast! As fast as the
computers at each end can execute Kermit, roughly 40,000+ bits per second
between standard AT's.
Second, Kermit can talk to other Kermits on the network as a Client (requestor)
Kermit to a Server Kermit. Many such pairings can be active simultaneously
without disturbing normal LAN operations. Each pair uses the NetBios unique
names to make a formal connection, or "virtual circuit." Thus one or more
Kermits can be named Servers and provide file exchanges between cooperating
stations, at the whim of individual users. A Kermit Server (using the NetBios
connection) left running all day can attend to many clients, one at a time of
course. Since Kermit is not a Terminate-Stay-Resident program, workstation
memory is freed when communications are finished.
Third, Kermit can act as a decent terminal (VT102, VT52, Heath-19 for text, and
Tektronix 4010+ for both text and color graphics) for connections to mainframes
and X.25 systems joined to the LAN; this seems to be one of the most popular
options. Of course, where terminal traffic can flow usually one may find
another Kermit to support file transfers.
What MS-Kermit cannot do: Well, it does not know how to converse with the LAN
fileserver even though the network's pseudo disk drives work fine with Kermit.
The reason is filesevers talk arcane proprietary languages across the LAN.
Similarly, it does not know about other specialized operations associated with
LAN servers, such as asynchronous modem servers, unless the LAN vendor supplies
software replacing the normal serial port driver on the workstation (some X.25
systems and UB do this).
Kermit cannot act as a bridge to relay traffic from one source, say the LAN
workstation, to another destination such as an attached modem. Kermit says
"Packets stop here," to borrow from Harry Truman.
What is needed to use MS Kermit across a LAN? One each: MS-Kermit version 2.30
or later for IBM PCs (2.31 for BIOSn or NetOne support), a LAN of arbitrary
size and manufacture, a matching LAN adapter board for the PC set to LAN
adapter board number zero. Mix well, enjoy.
Dynamic Packet Size Control
John Chandler
Harvard University
Kermit-370 release 4.0 (for CMS and TSO and, potentially, other operating
systems on IBM/370-type mainframes) has introduced a new feature with
importance to the transmission of long packets, namely, dynamic tailoring of
the packet size to noise conditions on the communication line. The
implementation in release 4.0 is a greatly simplified version of a more
detailed model that will be sketched out here. In essence, the model rests on
a few simple assumptions:
1. Transmission errors have a Poisson distribution, i.e., occur randomly and
not too frequently.
2. The effective speed is limited by both the transmission line data rate and
the CPU processing speed (both of which add delays proportional to the
number of bytes exchanged).
3. Each exchange of a packet and its acknowledgment is accompanied by a fixed
communication dead time, which may include any combination of computer time
sharing waits, line turnaround, satellite transmission delay, or other fixed
overhead.
4. Noise between packets has no ill effects. Thus, errors occur effectively
only in data packets, since those are much longer than the acknowledgments.
5. Each transmission error corrupts, but does not destroy, a packet.
With these assumptions, it is relatively straightforward to compute the
throughput of a Kermit transmission in data bytes per second, given the
relevant quantities:
- B, the block check type;
- P, the packet size (including the SOH and EOL);
- V , the computer encoding/decoding speed (serial, both computers);
C
- V , the communication line speed;
L
- X, the packet overhead (i.e., the number of non-data bytes in each packet);
- T , the packet dead time; and
D
- T , the average time between errors.
E
In these terms, the throughput is
(P-X) * exp(-P / (V * T ))
L E
---------------------------
(P+5+B) * (1/V +1/V ) + T
L C D
A plot of throughput versus packet size for this model has a characteristic
shape, rising sharply at small P, then leveling off and finally declining
gently at large P. Since the throughput goes through a maximum, there is an
optimum packet size, which can be found analytically from the expression for
throughput. Indeed, if the average time between errors is reasonably long,
i.e., if the mean number of characters transmitted between errors is much
greater than 20, and if T is much less than T , the optimum packet size can be
D E
approximated by
sqrt((X+5+B+D) * V * T )
L E
where D = T / (1/V + 1/V ) is the number of bytes that could have been
D L C
transmitted during the unavailable dead time.
In order to use this model, Kermit must have the theoretical quantities in
terms of observable ones. For example, V * T is, in the long run, equal to
L E
the total number of bytes transmitted (both ways) divided by the number of
errors, i.e., by the number of packets that must be resent. In short, Kermit
can keep a running tally of bytes, packets, and retries during a transmission
and from them compute the optimum packet size dynamically. If T is
D
negligible, then Kermit needs only a total of bytes sent (and received) and a
count of bad packets. Otherwise, Kermit must also have available the line
speed V plus a count of packets exchanged and the elapsed time. From the
L
tallied quantities, b, the total number of bytes exchanged; e, the number of
error retries; p, the number of packet exchanges; and t, the elapsed time, a
Kermit program can obtain the approximate optimum packet size in either of two
ways. Assuming negligible dead time gives
sqrt((X+5+B) * b/e)
which underestimates the optimum, and making allowance for large dead time
gives
sqrt((b/p - (X+5+B)) * (V * t - b) / e)
L
which overestimates by virtue of assuming that V far exceeds V .
C L
Kermit-370 has an implementation of the first expression, with the handy value
16 substituted for X+5+B (which would be 15 for B=1 and 19 for B=3). It is
clear from the two expressions that the optimum cannot be calculated if there
are no transmission errors; the optimum length would be infinite, and the
packet size can be just what the other Kermit requested. When the long-packet
protocol is in effect, Kermit-370 checks after every 20 packets during a SEND
to see if there have been any errors and, if so, computes the optimum packet
length based on the formula and uses that optimum size as an upper bound on
subsequent packets. Simulations (with V at 120 bytes/sec) have shown that
L
this method, while typically forcing the packet sizes to be smaller than
optimal, achieves at least 94% of the maximum possible throughput as long as T
D
is not significantly greater than one second and achieves essentially 100% when
T is less than half a second. At higher speeds, the dead time is
D
correspondingly more critical.
There are three main drawbacks to this simplified implementation. First, it
does poorly with extreme T (but that could be remedied by adding an
D
informational SET SPEED to Kermit). Second, it responds slowly to changes in
the noise environment (but that could be improved by replacing the cumulative
tallies with shorter-term subtotals). Third, it fails insofar as assumptions 4
or 5 do. For example, if errors caused packets to disappear, thereby
triggering timeouts as well as retransmissions, a quite different model would
be needed.
Kermit File Attributes
Frank da Cruz
Columbia University, New York City
The basic Kermit protocol allows one computer to send files to another, so that
each file arrives at its destination correctly and completely, under its own
name. But there are times when file transfer could be more useful if the
receiving computer knew a little bit more about the file: its type (text or
binary), its size, creation date, protection, or record format. These
characteristics are called "file attributes".
Users of MS-DOS Kermit, for example, have long been able to watch the
comforting "Percent Done" display when sending files, but when receiving them
this information is missing. If the sending Kermit was able to tell the
receiver in advance how big the file was, then not only could the receiver
display the percent done, but it could also check whether there was enough
space available for the file before agreeing to accept it, saving needless
aggravation when disks fill up. Certain systems even require preallocated disk
space before a file can be sent.
The Kermit protocol defines a way for Kermit programs to convey file attribute
information along with the files they send. This is called the Attribute
packet. One or more A-packets can be sent following Kermit's File header
packet, and preceding the file data, provided both Kermit programs agree to do
this during the feature negotiation phase. If they don't agree, files are
transferred in the normal way, without attribute information.
The first implementation of the file attribute mechanism was done by Brian
Nelson of the University of Toledo, Ohio, for PDP-11 Kermit in April 1984.
This was necessary because transferring the name and contents of a file alone
was not sufficient for the PDP-11's sometimes complex file and record
structure. By using Kermit's "system-dependent" file attribute field, PDP-11
Kermit is able to transmit a file's entire directory entry along with the file,
so that when the receiver is a PDP-11, any file can be stored in exactly the
same way as on the originating system.
Kermit defines a series of "generic" file attributes, including size, date,
type, and system of origin to allow the transferred file to reflect the
original as much as possible. One attribute of particular interest is
"disposition" - what to do with the file after it arrives. Normally, Kermit
simply stores it on the current disk. The disposition attribute allows the
sender to tell the receiver to print it instead, or to send it as mail to a
specified user, or to submit it as a batch job, or to run it as a program, or
to archive it. MS-DOS Kermit 2.31, for instance, includes a MAIL command,
which allows the PC user to transfer a file to a Kermit server for forwarding
to the given user as mail (unfortunately, there are no Kermits yet that can
respond to this command, but the ability to mail should appear in the next
release of C-Kermit).
Kermit file attributes are described in Chapter 12 of the Kermit book.
Additional attributes are expected to be defined in the future, for instance to
allow for representation of text files during data transfer in other than 7-bit
US ASCII format according to evolving ISO 8859 standards for international
character sets.
Like other advanced options, file attribute capability is gradually finding its
way into Kermit programs. Those that support it today include MS-DOS Kermit
2.31 (A:MS), IBM PC Turbo Pascal Kermit 1.1a (A:TP4), Kermit-370 4.0 for VM/CMS
and MVS/TSO (B:IK), PDP-11 Kermit (B:K11), as well as some of the commercial
Kermit implementations. Attribute support is planned for the next release of
C-Kermit.
SUMMARY OF RECENT RELEASES
Here is a concise list of Kermit releases since our last issue in November
1987. The notation (A:XYZ) means the version is available on tape A, as files
whose names start with XYZ; "diskettes" mean the item is also available from
Columbia Kermit Distribution on diskette (see order form). Volunteers listed
when available.
Micros and PCs:
- MS-DOS Kermit 2.31 for the IBM PC and PS2 family and compatibles, the DEC
Rainbow, the HP-150, and generic MS-DOS, written in Microsoft Macro Assembler
(MASM) by Joe Doupnik, Utah State University, June 1988 (A:MS, diskettes).
See articles on pages 3 and 4.
- MS-DOS Kermit 2.30 for NEC APCIII, MASM, Bob Goeke, MIT Center for Space
Research, Mar 88 (A:MS). Also on 5.25" diskette from Robert Goeke, MIT
Center for Space Research, Room 37-567, 77 Massachusetts Ave, Cambridge, MA
02139. Send 1 disk for executable; 4 disks for source code, and a stamped
return mailer.
- MS-DOS Kermit 2.30 for the Sanyo MBC 555, MASM, Bob Babcock, Harvard/
Smithsonian Center for Astrophysics, May 88 (A:MS). Also available on 5.25"
diskette from Bob Babcock, Sanyo New England Users Club Librarian, 4 Reeves
Road, Bedford, MA 01730, USA. Cost: $5 for executable and documentation, $10
for same plus source code on DS disks, $6/12 for SS disks. Foreign orders:
Pay in US funds, add $3 shipping.
- MS-DOS Kermit 2.30 for the ACT Apricot, MASM, Dick Carlton, The Open
University, UK, May 88 (A:MS).
- Intel iRMX-86 and iRMX-286 Kermit 2.30, based on MS-DOS Kermit 2.30, Jack
Bryans, California State University at Long Beach, May 88 (A:MS). Provides
most of the functions of IBM PC MS-Kermit. Also on 5.25" diskette for $10
from CSULB University Bookstore Computer Shop, 6049 E. 7th Street, Long
Beach, CA 90840 (specify Disk 1).
- MS-DOS QK-Kermit Version 3.0 in Turbo Pascal Version 4 for the IBM PC
family, with Tektronix emulation, Victor Lee, Queens University, Kingston,
Ontario, Apr 88 (A:QK). Improved graphics, support for a variety of graphics
adapters. Also available on diskette for $10 (Canadian or US, incl. manual)
from Victor Lee, Computer and Communications Services, Dupuis Hall, Queen's
University, Kingston, Ontario, CANADA K7L 3N6 (USA & Canada only).
- MS-DOS Kermit 1.1a for the IBM PC family and compatibles, Turbo Pascal,
Terje Mathisen, Norsk Hydro Data, Norway, Apr 88 (A:TP4). Sliding windows,
long packets, attributes. Rudimentary dumb terminal emulation. This version
came to us indirectly; we've had no contact with the author.
- Macintosh Kermit 0.9(40) from Paul Placeway and Matthias Aebi, MPW C, Jun 88
(B:CK, diskette). See article on page 3.
- Apple II DOS and ProDOS Kermit-65 Version 3.81, 6502 Assembler, Ted Medin,
Feb 88 (A:APP). New features include wildcard send, improved VT100
emulation, new manual. Also available on 5.25" diskette for $10 from Peter
Trei, 15 Sickles Street, New York, NY 10040 (USA only).
- Commodore 64/128 Kermit 2.1(68), 6502 Assembler, Ray Moody, Purdue
University, Apr 88, (A:C64). New features include limited Tektronix 4010
emulation and improved VT100 emulation. Also available on diskette for $5
($10 with manual) from Dr. Evil Laboratories, P.O. Box 190, St. Paul, IN
47272 (USA only, Indiana residents add 5% sales tax).
- CP/M-80 Kermit Version 4.09, LASM, Bertil Schou, Loughborough University,
UK, 18 May 88 (A:CP). See article, p.3.
Minis, Mainframes, and Supercomputers:
- IBM Mainframe Kermit 4.0 for VM/CMS, 370 Assembler, John Chandler,
Harvard/Smithsonian Center for Astrophysics, Dec 87 (B:IK). See article on
page 3.
- IBM Mainframe Kermit 4.0 for MVS/TSO, 370 Assembler, John Chandler, loc.
cit., Mar 88 (B:IK).
- VAX/VMS Kermit-32 3.3.117, the Stevens Institute of Technology
Bliss-language version, modified by Jonathan Welch of Amherst College, MA, to
fix several bugs and add some minor features, Jun 88 (B:VMS).
- C-Kermit 4E(070) for UNIX, VMS, etc, in C, Frank da Cruz, Columbia
University, New York, Jan 88 (B:CK). Minor fixes and improvements to
4E(067), the first long-packet C-Kermit release.
- C-Kermit 4E(070) adapted to OS-9/68K, Bob Larson, Feb 88 (B:CK).
- C-Kermit 4D(061) adapted to Andrew Tanenbaum's MINIX, Adrian Godwin,
Bedford, UK, Feb 88 (B:MX).
- CDC Cyber NOS Kermit 3.4, Fortran, Steve Roseman, LeHigh University, and
Olaf Pors, University of Virginia, May 88 (D:CD3). Wildcards, compression,
long packets, init & take files, support for CDCNET, bug fixes, many new
commands.
- DECSYSTEM-20 Kermit 4.2(262), Assembler, Frank da Cruz, Jan 88 (B:K20).
Minor improvements.
- Honeywell CP-6 Kermit 1.00, PL/6, Lee Hallin, Honeywell Bull, Los Angeles,
CA, Jan 88 (D:HC6). Improved performance, bug fixes, some new features.
- Harris-100 Kermit 1.06, Fortran-77, Skip Russel, Washington University, St.
Louis, MO, Mar 88 (D:H1). Bug fixes.
- MAI Basic Four Kermit in Business Basic, E.V. Wastrodowski, Sphere Holdings
Ltd, Laguna Hills, CA, Apr 88 (D:MBF). First Kermit release for this system.