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From: wtm@neoucom.UUCP (Bill Mayhew)
Newsgroups: comp.sys.amiga
Subject: Re: More bugs in DBW's VT100
Message-ID: <331@neoucom.UUCP>
Date: Wed, 3-Dec-86 09:29:18 EST
Article-I.D.: neoucom.331
Posted: Wed Dec  3 09:29:18 1986
Date-Received: Wed, 3-Dec-86 22:50:55 EST
Organization: Northeastern Ohio Universities College of Medicine
Lines: 42
Summary: garbage due to vi timeout

In article <6478@ut-sally.UUCP>, srinivas@ut-sally.UUCP (Srinivasan Sankaran) writes:
> ...
> I compiled with Lattice (version ?.??). If I keep pressing any of the arrow 
> keys in vi, a lot of lines with just one character (usually "C") get inserted 
> in the in the file.
> 
> -srinivas

I sounds like you are getting bitten by the timeout in vi that
differntiates terminal generated escape sequences from the the user
pressing the escape key, then after n milliseconds typing some
command.

On the VT100, the right arrow generates ^[ [ C, and in the keypad
mode generates ^[ O c, which means that if things are going slow,
and vi has you in keypad mode (which it does for the "normal" vt100
termcap or terminfo) that you are going to exit from insert mode,
and then suddenly find yourself with a capital C on the line above
the one you were working on.

Here, we run over ethernet servers to the Vax and occasionally, an
arrow escape sequence gets broken up between two ethernet packets
and results in an unwanted insetion of A,B,C, or D depending on the
arrow pushed.  That's how I first encountered this on a real
vt100.

I'm not a vi expert; perhaps, you could change the durration of the
timeout, or else operate at a lower baud rate, as the timeouts are
calculated proportional to the baud rate.

You also might try recompiling under Aztec rather than Lattice, as
the stdio functions are faster in Lattice, so I'm told.  I have a
version of DBW's vt100 version 2.3 that was compiled under Lattice
that our vax seems to believe is a real vt100 without problems.

BTW:  thanks DBW.  vt100 is really nice, especially the kermit.

Bill Mayhew
Division of Basic Medical Sciences
Northeastern Ohio Universities' College of Medicine
Rootstown, OH  44272  USA    phone:  216-325-2511
(...!cbatt!neoucom!wtm    wtm@neoucom.UUCP)