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000183_news@columbia.edu_Thu Apr 20 17:03:40 1995.msg
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From: fdc@watsun.cc.columbia.edu (Frank da Cruz)
Newsgroups: comp.protocols.kermit.misc
Subject: Re: Terminal emulation incorrect?
Date: 20 Apr 1995 17:03:40 GMT
Organization: Columbia University
Lines: 53
Message-Id: <3n645c$okc@apakabar.cc.columbia.edu>
References: <3n3koo$ref@highway.LeidenUniv.nl> <1995Apr19.182025.47998@cc.usu.edu> <3n5lu8$gbq@sundog.tiac.net>
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In article <3n5lu8$gbq@sundog.tiac.net>,
Michael Ciaraldi <ciaraldi@max.tiac.net> wrote:
>In article <1995Apr19.182025.47998@cc.usu.edu> jrd@cc.usu.edu (Joe Doupnik) writes:
>>In article <3n3koo$ref@highway.LeidenUniv.nl>, noordam@rulcri.LeidenUniv.nl (STEPHAN NOORDAM) writes:
>>> I use MS-Kermit 3.14 (18.1.95) with VT102 terminal emulation to
>>> communicate with a VAX/VMS computer, and have the following problems.
>>>
>>> * The VAX-prompt does not always appear at the bottom of the
>>> screen.
>>> * The position of the cursor is not always shown correctly.
>
>This sounds like a possible flow control problem to me.
>Losing a few bytes in a control sequence might have effects like this.
>Just a thought.
>
It's always a possibility. But usually when you have flow control
problems (and therefore data loss), you see fragments of escape sequences
on the screen -- lots of left brackets, numbers, semicolons, etc. But
yes, it is always a good idea to be sure that flow control is in effect,
but the exact setup depends on how you came into VMS (direct dial,
terminal server, etc). On the VMS end, you have to make sure SHOW TERM
says TTSYNC and HOSTSYNC, and then everything else is set up as required
by the connection (RTS/CTS, hopefully, if dialing into a terminal server /
Xon/Xoff if dialing in to a VAX port).
I think Stephan said he was using VT102 emulation, so I would not expect
8-bit transparency to be a problem. But since MS-DOS Kermit provides full
VT320 emulation, and VMS can take advantage of it, why not use it? Before
logging in to VMS, tell MS-DOS Kermit to:
set parity none
set term byte 8
set term controls 8 ; optional
set term type vt320
and then VMS and Kermit should "configure each other" appropriately.
If you can't actually make an 8-bit connection, then:
set parity even ; or space, or whatever
set term byte 7
set term controls 7
set term type vt320
and tell VMS to:
set term /noeight
But like I said before, all bets are off if you are using some kind of
"front end" to VMS with hardwired escape sequences in it. Properly
written screen-oriented VMS applications use SMG, which is sort of the
VMS equivalent of curses, rather than sending hardcoded escape sequences.
- Frank