[Info-vax] VTxxx/VMS term driver: bug or feature?

Jan-Erik Soderholm jan-erik.soderholm at telia.com
Tue Jul 5 12:45:44 EDT 2011


VAXman- @SendSpamHere.ORG wrote 2011-07-05 16:26:
> In article<W75R8kxItmfA at eisner.encompasserve.org>, koehler at eisner.nospam.encompasserve.org (Bob Koehler) writes:
>> In article<00AB1B94.1FA197E0 at SendSpamHere.ORG>,   VAXman-  @SendSpamHere.ORG writes:
>>>
>>> Initially, I would have thought that the local nowrap, terminal driver
>>> /WRAP combination should have appears the same.  Strangely enough, the
>>> terminal emulator I was checking didn't show this.  While testing it,
>>> I was performing the same tests on 2 VT terminals (VT220 and VT525, as
>>> well as, a DECterm).  I was simple taken aback when I saw differences
>>> that were shown on the VTs and DECterm but not this terminal emulator.
>>> I am, of course, convinced now that the terminal emulator got it flat
>>> out wrong.
>>
>>    After further investigation, I decided to try the other two
>>    combinations:  local nowrap and driver /NOWRAP, local wrap
>>    and driver /WRAP.  In doing so, I reduced the line separation to try
>>    to fit everything on one screen.
>>
>>    The results are much different, in comaring DEC VTSTAR to PuTTY's
>>    emulation. I haven't tried it on anything else yet.
>
> Right.
>
> When using real VT terminals, the result with the /WRAP and no local wrap
> shows that the terminal driver doesn't have knowledge of where the string
> of digits begins.  The terminal driver could, however, know if it issued
> a CPR but that's _NOT_ what's at issue here.  The issue is whether or not
> these real VT results should be expected on the VT terminal emulators.  I
> am going to say that they should reproduce these results IF they were true
> VT emulations.  I'd conclude from my testing of several emulators is that
> they've all got it wrong.
>

Now, emulators have been there for, say, 20+ years.
I have a hard time thinking this is a *real* problem
if the emululators still works as they do ("wrong" in
your opinion). If this was a real problem, I would have
expected this to be "fixed" long ago.

What is the real-life example where this is an issue ?







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