[Simh] Escape sequence problem with VMS/DECterm

[Mark Pizzolato - Info Comm]

Hi Alan,

Well, the problem you are seeing is the default modes TTO (output).  The default input (TTI) mode is 7b, the default output (TTO) mode is 7p.

7p is 7 bit data and with non-printing characters suppressed on output.

Setting the mode of either TTI or TTO device sets them both to the same mode, so setting TTI 7b or 8b removes the suppression of non-printing output characters on TTO.

Since the documentation did not reflect the actual code I will change the documentation since folks may have configuration files which depend on the original (undocumented) behavior.  The latest documentation is in the doc directory of the github simh repo.

- Mark

On Sunday, April 12, 2015 at 11:21 AM, Alan Frisbie wrote:
> OK, the problem just got odder:
> 
> > > Try the following command in your startup:
> > >
> > > set tti 7b
> >
> > That fixed it!   Thank you very much.
> >
> > Now the question is why 8b (the default) does not work?
> 
> After finding that "set tti 7b" worked, I set it to 8b and it still works!
> 
> Also, the documentation says the default is 8b, but when I start up a new
> instance and "show tti", it says it is 7b.
> 
> Something very odd is happening.
> 
> Alan Frisbie