[TUHS] vi on v7

[Will Senn]

On 1/5/22 11:34 AM, Phil Budne wrote:
> Will Senn wrote:
>> so then I tryed vt50 and vt52 modes...
> xterm should have VT52 emulation, at least the man page on my system says:
>>         o   VT52 emulation is complete.
> But looking at CTRL+{LEFT,MIDDLE,RIGHT}_CLICK menus didn't show a toggle.
>
> The VT100 sequence to enter VT52 mode seems to be <ESC>[?2l
> you should be able to send it with echo.
>
> Then <ESC>H<ESC>J should clear the screen.
>
> NOTE! The ANSI command prefix <ESC>[ will put a real VT52 into "hold
> screen" mode where you need to press some (scroll?) button to allow
> new lines to be added at the bottom of the screen.  Ask me how I know!
>
> phil
Well, is there no end to fascination... That 'worked' in that I was able 
to do this in n xterm on my mac:

    printf "\033[?2l"


which changed the size of the xterm window to 80 chars wide... then:

    printf "\033H\033J"


which cleared the screen as you said it would.

But, then, I telnet'd into the the v7 instance and set TERM=vt52, etc.

Now vi gives this:

    Y7 HJY- ~
             ~
             ~
             ~
             ~
             ~
             ~
             ~
             ~
             ~Y,


However, I should note that v7 doesn't seem to process escape sequences, 
either with a pristine instance or my fully configured instance...

    echo '\033'
    \033

    $ ed test
    ?test
    a
    <ESC>J (just echoes the J)
    .
    w
    3
    q
    $ od -c test
    0000000 033   J  \n  \0
    0000003
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