HORIZONTAL SCAN LINEs

The current version (and 7.0.0-tobe) describe them as:

    @ Scan lines for terminal graphics
    @+ The scan line numbers here refer to old,
     low-resolution technology for terminals, with only 9 scan lines per
     fixed-size character glyph. Even-numbered scan lines are unified with
     box-drawing graphics.
    23BA HORIZONTAL SCAN LINE-1
    23BB HORIZONTAL SCAN LINE-3
    23BC HORIZONTAL SCAN LINE-7
    23BD HORIZONTAL SCAN LINE-9

Is not it a complete BS? Was not this intended to be written similar to:

  Glyphs for even-numbered scan lines were never defined. The 5th
  scan line is unified with U+2500 (from box-drawing graphic).

Please note that even well-researched fonts (like Symbola) treat them
wrongly. Should not another comment (or two) be better added:

  Line-1 was the top line of the character box, and Line-9 was at the bottom.
  These characters were intended to connect on the sides, and with

          23B8 LEFT VERTICAL BOX LINE
        23B9 RIGHT VERTICAL BOX LINE

Thanks,
Ilya

P.S. The references I found are

      http://lists.freedesktop.org/archives/wayland-devel/2012-May/003687.html
      http://invisible-island.net/vttest/images/VTTEST-VT100%20character%20sets.png
        illustrating http://invisible-island.net/vttest/
      http://www.unicode.org/mail-arch/unicode-ml/y2001-m09/0037.html
      5-9 in ftp://kermit.columbia.edu/kermit/ucsterminal/ucsterminal.txt
      http://paulbourke.net/dataformats/ascii/ (search for: control-backspace)
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Received on Wed Apr 02 2014 - 13:37:47 CDT