Any faithful VT100 Emulators?

Paul Koning paulkoning at
Wed Mar 22 08:01:40 CDT 2017

> On Mar 22, 2017, at 7:11 AM, Peter Coghlan via cctalk <cctalk at> wrote:
> ...
> I've used Putty to connect to a VMS system to run TPU (which I think LSE is
> a thinly disguised variant of) and I have regularly come across an irritating
> bug which messes up full screen editing when the on-screen cursor seems to get
> out of step with the text that is actually getting changed, or something like
> that anyway.  Scrolling down the file and scrolling back up to the point where
> changes were made reveals that the changes actually made were not what it
> looked like was changed on the screen.

I don't remember how VMS describes terminal types, but here's one possible issue.  VT100 is fairly different from VT101/102, and if the emulator is emulating a VT100 while the application has been told it has a VT102, things are likely to be problematic.  I vaguely remember that VT100 lacks the insert operations, and if the program tries to use those when they aren't there, that would certainly cause the sort of problems you mentioned.


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