Re: RCTE


Charles Hedrick (hedrick@topaz.rutgers.edu)
Sat, 26 Sep 87 15:09:09 EDT


On Unix, my impression is that we have roughly three modes:
  - normally software lets the system do line editing. In this
        mode, the terminal server could do the editing and
        then pass whole lines without echo
  - raw or cbreak mode is used by a few programs that do screen
        handling. It is specifically enabled by a system call,
        which would give the kernel a chance to trigger
        negotiation of a different telnet mode. THis would
        be full duplex, char at a time.
  - some screen-oriented programs are used enough that it is
        worth modifying them to give the terminal server
        instructions. Emacs is probably the best example.
        The main screen-oriented programs I use are emacs nad
        vnews. Vnews is not worth doing, I suspect, since
        normally the characters typed a single letters anyway,
        so not much improvement is to be had. I understand
        that Encore already has support for emacs in their
        terminal servers. I don't know what they are doing,
        but experiments were done with TOPS-20 Emacs based
        on the concept that Emacs should let the temrinal
        server echo, and should specify two things: a bit
        map - when any of these characteris is typed, the
        server should go back into char at a time mode, and
        let Emacs respond to that character; a count - when
        that many characters had been typed, ditto. The idea
        was that most people spent most of their time typing
        text at the end of a line. Emacs would set the bitmap
        to all of the command chars (in effect, all but printing
        characters), and the count to the number of characters
        left on the line (since Emacs will have to do some
        screen management when you reach the end of the line).
        probably Encore is in a position to make additional
        suggestions, but this seems a reasonable place to start.



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