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000173_news@newsmaster….columbia.edu _Thu Oct 23 10:36:36 1997.msg
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From: fdc@watsun.cc.columbia.edu (Frank da Cruz)
Newsgroups: comp.sys.hp.mpe,comp.protocols.kermit.misc
Subject: Re: file transfer protocols
Date: 23 Oct 1997 14:36:31 GMT
Organization: Columbia University
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In article <9709228775.AA877536887@itauucp.ita-relay.com>,
Marshall Medoff <Marshall@ITA-RELAY.COM> wrote:
: Our HP3000 has an installation of Telamon's Network Engine which came
: with a version of Kermit. This version has a record length on send
: and receive of 2048 bytes.
:
: Is there another version of Kermit for the HP3000 that has no such
: limitation?
:
There are two Kermit programs for the HP-3000, both by Tony Appelget of
General Mills (now retired): One written in C and another written in SPL. As
far as I know, the functionality of the two is equivalent. They don't have
version numbers, but the release date for both programs is 3 September 1994:
ftp://kermit.columbia.edu/kermit/d/hp3*.*
Tony is no longer reachable, as far as I know, and we (at the Kermit Project)
have never even seen an HP-3000 except once on a tour of INION (the Institute
of Scientific Information for Social Science of the USSR Academy of Science)
in Moscow in 1989, and so I can't explain the 2048-byte limitation. Supposing
it is not there for any good reason, then it is just a number that you can
change (you have the source code) to any other number up to 9024, which is the
maximum Kermit packet length, so you are certainly welcome to try it. But I
suspect that the 2048 limitation was more likely imposed because of some kind
of buffering limitation on communication-device reads, and so the workaround
might not quite so simple. (I am not steeped in HP-[13]00 lore, but I seem
to recall a lot of talk about this mux and that mux and their respective
peculiarities.)
However, given that Tony is no longer on the case, perhaps a better solution
to this problem -- and to various others mentioned recently on this newsgroup
(the need for a scriptable Telnet client, the need to translate HP-Roman8 text
files appropriately when transferring to non-HP platforms, etc), a port of
C-Kermit 6.0 would be a better choice, if an HP-3000 C programmer was willing
to take it on. In addition to the advantages just mentioned, this would also
give HP-3000 users a high-performance Kermit implementation with all the
advanced features of the protocol (sliding windows, locking shifts, etc) that
operated independently of the communications medium (direct serial, dialed
serial, network).
: In looking at 3K Associates' web site and going into Telamon's freeware
: section, I was happy to see versions of Kermit and Xmodem, but after
: downloading Xmodem, I was dismayed to see that it did not work.
:
Xmodem and Ymodem need a fully transparent 8-bit clean communication path;
Kermit doesn't. Zmodem might or might not be able to work over connections
that are not fully transparent -- it depends on the Zmodem implementations
at each end.
If you're an HP-3000 C programmer and might be interested in doing an HP-3000
port of C-Kermit, please get in touch.
Frank da Cruz <fdc@columbia.edu>
The Kermit Project, Columbia University
http://www.columbia.edu/kermit/