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000232_news@columbia.edu _Tue Jan 30 10:43:53 2001.msg
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From: fdc@columbia.edu (Frank da Cruz)
Subject: Re: New release of DEC-20 Kermit
Date: 30 Jan 2001 15:31:59 GMT
Organization: Columbia University
Message-ID: <956mpf$qhh$1@newsmaster.cc.columbia.edu>
To: kermit.misc@columbia.edu
In article <3A762DDC.FBD6FB61@yk.rim.or.jp>,
Ishikawa <ishikawa@yk.rim.or.jp> wrote:
: > This is to announce (no kidding) Version 5.1 of DECSYSTEM-20 KERMIT,
: > replacing version 4.2 of September 1988. Version 5.1 adds long packets,
: > which were never done before because long packets would crash a real
: > DEC-20.
:
: I crashed the DEC-20 because of such long transfer until
: a DEC engineer told me why after we sent them a crash dump tape.
:
: Essentially I was told that the tty input queue was
: very short since nobody was going type in very quickly and
: I was overflowing it! Oh, the joy of "mainframe" programming!
:
Yes, this is the entire reason for the original 94-byte limit on the length
of a Kermit packet. The initial design of the Kermit protocol was very much
a lowest-common-denominator affair -- a protocol that would not break the
DEC-20 and would also work with the IBM mainframe. But it was also
deliberately extensible, and that's why we've been able to grow it over the
years. Unfortunately, many people have yet to see past the original design
and still, after nearly 20 years, believe the protocol is intrinsically slow.
: Care to comment where [the KL20] emulator will be available?.
:
Tune in to alt.sys.pdp10 for fairly constant updates.
- Frank