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Annotation of 43BSD/contrib/emacs/etc/TERMS, revision 1.1

1.1     ! root        1: This file describes what you must or might want to do to termcap entries
        !             2: to make terminals work properly and efficiently with Emacs.  Information
        !             3: on likely problems with specific types of terminals appears at the end
        !             4: of the file.
        !             5: 
        !             6: *** What you want in a terminal ***
        !             7: 
        !             8: Vital
        !             9: 1. Easy to compute suitable padding for.
        !            10: 2. Never ever sends ^S/^Q unless you type them, at least in one mode.
        !            11: 
        !            12: Nice for speed
        !            13: 1. Supports insert/delete of multiple lines in one command.
        !            14: 2. Same for multiple characters, though doing them one by
        !            15: one is usually fast enough except on emulators running on
        !            16: machines with bitmap screens.
        !            17: 
        !            18: Nice for usability
        !            19: 1. Considerably more than 24 lines.
        !            20: 2. Meta key (shift-like key that controls the 0200 bit
        !            21: in every character you type).
        !            22: 
        !            23: *** New termcap strings ***
        !            24: 
        !            25: Emacs supports certain termcap strings that are not described in the
        !            26: 4.2 manual but appear to be standard in system V.  The one exception
        !            27: is `cS', which I invented.
        !            28: 
        !            29: `AL'    insert several lines.  Takes one parameter, the number of
        !            30:         lines to be inserted.  You specify how to send this parameter
        !            31:        using a %-construct, just like the cursor positions in the `cm'
        !            32:        string.
        !            33: 
        !            34: `DL'    delete several lines.  One parameter.
        !            35: 
        !            36: `IC'    insert several characters.  One parameter.
        !            37: 
        !            38: `DC'    delete several characters.  One parameter.
        !            39: 
        !            40: `rp'    repeat a character.  Takes two parameters, the character
        !            41:         to be repeated and the number of times to repeat it.
        !            42:        Most likely you will use `%.' for sending the character
        !            43:        to be repeated.  Emacs interprets a padding spec with a *
        !            44:        as giving the amount of padding per repetition.
        !            45: 
        !            46: `cs'    set scroll region.  Takes two parameters, the vertical
        !            47:        positions of the first line to include in the scroll region
        !            48:        and the last line to include in the scroll region.
        !            49:        Both parameters are origin-zero.  The effect of this
        !            50:        should be to cause a following insert-line or delete-line
        !            51:        not to move lines below the bottom of the scroll region.
        !            52: 
        !            53:        This is not the same convention that Emacs version 16 used.
        !            54:        That is because I was led astray by unclear documentation
        !            55:        of the meaning of %i in termcap strings.  Since the termcap
        !            56:        documentation for `cs' is also unclear, I had to deduce the
        !            57:        correct parameter conventions from what would make the VT-100's
        !            58:        `cs' string work properly.  From an incorrect assumption about
        !            59:        %i, I reached an incorrect conclusion about `cs', but the result
        !            60:        worked correctly on the VT100 and ANSII terminals.  In Emacs
        !            61:        version 17, both `cs' and %i work correctly.
        !            62: 
        !            63:        The version 16 convention was to pass, for the second parameter,
        !            64:        the line number of the first line beyond the end of the
        !            65:        scroll region.
        !            66: 
        !            67: `cS'    set scroll region.  Differs from `cs' in taking parameters
        !            68:        differently.  There are four parameters:
        !            69:        1. Total number of lines on the screen.
        !            70:        2. Number of lines above desired scroll region.
        !            71:        3. Number of lines below (outside of) desired scroll region.
        !            72:        4. Total number of lines on the screen, like #1.
        !            73:        This is because an Ambassador needs the parameters like this.
        !            74: 
        !            75: `cr', `do', `le'
        !            76:        Emacs will not attempt to use ^M, ^J or ^H for cursor motion
        !            77:        unless these capabilities are present and say to use those
        !            78:        characters.
        !            79: 
        !            80: Defining these strings is important for getting maximum performance
        !            81: from your terminal.
        !            82: 
        !            83: Make sure that the `ti' string sets all modes needed for editing
        !            84: in Emacs.  For example, if your terminal has a mode that controls
        !            85: wrap at the end of the line, you must decide whether to specify
        !            86: the `am' flag in the termcap entry; whichever you decide, the `ti'
        !            87: string should contain commands to set the mode that way.
        !            88: (Emacs also sends the `vs' string after the `ti' string.
        !            89: You can put the mode-setting commands in either one of them.)
        !            90: 
        !            91: *** Specific Terminal Types ***
        !            92: 
        !            93: Watch out for termcap entries for Ann Arbor Ambassadors that
        !            94: give too little padding for clear-screen.  7.2 msec per line is right.
        !            95: These are the strings whose padding you probably should change:
        !            96:     :al=1*\E[L:dl=1*\E[M:cd=7.2*\E[J:cl=7.2*\E[H\E[J:
        !            97: I have sometimes seen `\E[2J' at the front of the `ti' string;
        !            98: this is a clear-screen, very slow, and it can cause you to get
        !            99: Control-s sent by the terminal at startup.  I recommend removing
        !           100: the `\E[2J' from the `ti' string.
        !           101: The `ti' or `vs' strings also usually need stuff added to them, such as
        !           102:     \E[>33;52;54h\E[>30;37;38;39l
        !           103: You might want to add the following to the `te' or `ve' strings:
        !           104:     \E[>52l;\E[>37;h
        !           105: The following additional capabilities will improve performance:
        !           106:     :AL=1*\E[%dL:DL=1*\E[%dM:IC=4\E[%d@:DC=4\E[%dP:rp=1*%.\E[%db:
        !           107: If you find that the Meta key does not work, make sure that
        !           108:     :km:
        !           109: is present in the termcap entry.
        !           110: 
        !           111: Watch out for termcap entries for VT100's that fail to specify
        !           112: the `sf' string, or that omit the padding needed for the `sf' and `sr'
        !           113: strings (2msec per line affected).  What you need is
        !           114:     :sf=2*^J:sr=2*\EM:cs=\E[%i%d;%dr:
        !           115: 
        !           116: The Concept-100 and Concept-108 have many modes that `ti' strings
        !           117: often fail to initialize.  If you have problems on one of these
        !           118: terminals, that is probably the place to fix them.  These terminals
        !           119: can support an `rp' string.
        !           120: 
        !           121: Watch out on HP terminals for problems with standout disappearing on
        !           122: part of the mode line.  These problems are due to the absence of
        !           123: :sg#0: which some HP terminals need.

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