linewrap

[Myron Seto]

I am using the Procomm version 2.4.2 as a terminal emulator
on my IBM XT.  One of the Set-up features is that I have to
set Line Wrap=On. If not, whenever I do a 'cat' command,
for example, the text runs off at the end of the line.
The problem is that whenever I use vi, many strange things
happen-lines appear twice(!), deleting lines is a hassle,
etc.  Basically, the CRT does not show what it supposes to
show in vi with line wrap on.
Can anyone tell me how I can have both Line wrap, and not
have vi going berserk?
Procomm is emulating the vt100 by the way, if that is part
of my problem.
I would appreciate any help.
Thanks!
Myron