Re: vt100

[Johnny Billquist <bqt%update.uu.se@localhost>]

On 2017-12-30 21:56, John Nemeth wrote:
> On Dec 30,  7:56pm, Kamil Rytarowski wrote:
> }
> }
> } On 30.12.2017 19:39, Thomas Dickey wrote:
> } > ----- Original Message -----
> } > | From: "Valery Ushakov" <uwe%stderr.spb.ru@localhost>
> } > | To: netbsd-users%netbsd.org@localhost
> } > | Sent: Saturday, December 30, 2017 1:28:53 PM
> } > | Subject: Re: vt100
> } > |
> } > | Kamil Rytarowski <n54%gmx.com@localhost> wrote:
> } > ...
> } > |
> } > | > I've uploaded screen shot of xterm and script(1) recording.
> } > | >
> } > | > http://netbsd.org/~kamil/vt100/
> } > |
> } > | The typescript looks strange.  Are you sure there was not accidental
> } > | conversion(s) to/from utf-8 somewhere along the path?
> } >
> } > That might be part of it, but the 233's are pretty clear.
> } > The host is responding with C1 controls, and that seems to be the main issue.
> } > Either make it work properly (I'd do that...) or back off and just be a VT100/VT102.
> }
> } I use the default options and I assume that something is wrong on the
> } NetBSD side.
>
>       Why would you automatically assume that?  That's a pessimatic
> viewpoint towards NetBSD.

:-)

> } My only host change in my env(1)/NetBSD-host that might affect something is:
> }
> } LC_ALL=pl_PL.UTF-8
>
>       Given what Thomas Dickey said about the 8-bit controls earlier
> it sounds like you're failing to tell the OpenVMS side what type
> of terminal you have (i.e. it thinks that you have a VT220 or newer
> model when you only have a VT100).  If this is the case, then it
> is user error on your part and not NetBSD's fault at all.

In general, I agree.

If I got everything right in this thread, the OP is trying to use xterm 
and other programs. And it fails both in some output (fail to parse some 
escape sequences) and input (fails with delete).

There are several issues and problems with the whole thing. First of 
all, as others have mentioned, TERM is not for telling xterm how to 
work, but telling other programs what kind of terminal (in this case 
xterm) you are using, so that the program can send the correct sequence 
of characters to clear the screen (for example).
The second problem is that the OP seems to have logged into a VMS 
system, and either explicitly told the system to use 8 bit control, or 
told the VMS system that he has a VT200 or newer. Both alternatives in 
the end makes VMS use 8 bit control characters. Meaning a sequence like 
CSI is not made up from ESC + "[", but instead 0233 (octal), which is 
the equivalent 8-bit control character for CSI. Now, getting UTF-8 
anywhere near this is just going to cause total destruction. In general, 
if you want to talk to older systems, the first thing you need to kill 
is anything related to UTF-8 And then you still need to make sure that 
your terminal type that you use is correctly reflected in the terminal 
settings of the VMS system in this case (or the TERM variable, if you 
are on Unix).
Finally, the delete problem, which is caused by people and programs 
today commonly using the BACKSPACE character for deleting, while older 
systems (especially non-Unix) using the DEL character for deleting.
xterm can be made to use either, and you can even change by accessing a 
manu (CTRL+left mouse).

  Johnny

--
Johnny Billquist                  || "I'm on a bus
                                  ||  on a psychedelic trip
email: bqt%softjar.se@localhost             ||  Reading murder books
pdp is alive!                     ||  tryin' to stay hip" - B. Idol