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Int 2Fh / 1A00h         Get ANSI.SYS Installed State                 DOS 4.0+

    Determines whether the ANSI.SYS device driver has been loaded.

        Entry   AX = 1A00h

        Return  AL = 0FFh | 00h   ANSI.SYS loaded | not loaded

    ------------------------------------------------------------------

    ANSI Escape Sequences

    ANSI escape sequences affect output to the screen device, giving
    programs control of the screen's cursor, colors, and display
    modes. (An escape sequence is one or more characters preceded by
    the escape character ASCII 1Bh.) When a program writes an escape
    sequence to the screen, the screen device translates the sequence
    into its corresponding action, such as positioning the cursor or
    changing colors.

    The following list summarizes the ANSI escape sequences supported
    by the ANSI.SYS driver. ANSI escape sequences are available only
    if this driver has been installed. Parameters shown in underline
    are ASCII strings representing integers.

    Escape sequence     Action
        ESC[2J          Clears the entire screen and moves the cursor
                        to upper-left corner (home).
        ESC[K           Clears the screen from cursor to end of line.
        ESC[rowsA       Moves the cursor up the specified number of
                        rows without changing the column (one row if
                        rows omitted). Ignored if cursor already
                        at top row.
        ESC[rowsB       Moves the cursor down the specified number of
                        rows without changing the column (one row if
                        rows omitted). Ignored if cursor already
                        at bottom row.
        ESC[colsC       Moves the cursor to the right the specified
                        number of columns without changing the row
                        (one column if cols omitted). Ignored if
                        cursor already at rightmost column.
        ESC[colsD       Moves the cursor to the left the specified
                        number of columns without changing the row
                        (one column if cols omitted). Ignored if
                        cursor already at leftmost column.
        ESC[row;colH    Moves the cursor to an absolute position, e.g.
                        ESC[25;80H moves the cursor to the lower-right
                        corner on an 80x25 screen. Either row or col
                        can be omitted.
        ESC[s           Saves the current cursor position.
        ESC[u           Moves the cursor to the position most recently
                        saved by ESC[s.
        ESC[6n          Returns the current cursor position in the
                        format ESC[row;colR. A program should read the
                        cursor position from standard input immediately
                        after writing the escape sequence.
        ESC[attrm       Selects from the character attributes and
                        colors in Table 1. If more than one attribute
                        or color is specified, values are separated by
                        semicolons. The ability to display certain
                        attributes and colors depends on the screen
                        device.
        ESC[=modeh      Selects on of the display modes in Table 2.
        ESC[=7l         Disables line wrap.


        Table 1 - Character attributes and colors
          Value   Attribute
            0     No special attributes
            1     High intensity
            2     Low intensity
            3     Italic
            4     Underline (on monochrome display adapter only)
            5     Blinking
            6     Rapid blinking
            7     Reverse video
            8     Invisible (doesn't display)
        Foreground    Background
          value         value         Color
           30            40           Black
           31            41           Red
           32            42           Green
           33            43           Yellow
           34            44           Blue
           35            45           Magenta
           36            46           Cyan
           37            47           White

        
        Table 2 - Display modes
        Value   Mode
          0     40 columns by 25 rows, 16-color text (color burst off)
          1     40 columns by 25 rows, 16-color text
          2     80 columns by 25 rows, 16-color text (color burst off)
          3     80 columns by 25 rows, 16-color text
          4     320 pixels by 200 pixels, 4-color graphics
          5     320 pixels by 200 pixels, 4-color graphics (color burst off)
          6     640 pixels by 200 pixels, 2-color graphics
          7     Enables line wrapping
          14    640 pixels by 200 pixels, 16-color graphics (EGA/VGA)
          15    640 pixels by 350 pixels, 2-color graphics (EGA/VGA)
          16    640 pixels by 350 pixels, 16-color graphics (EGA/VGA)
          17    640 pixels by 480 pixels, 2-color graphics (MCGA/VGA)
          18    640 pixels by 480 pixels, 16-color graphics (VGA)
          19    320 pixels by 200 pixels, 256-color graphics (MCGA/VGA)
        Note: Modes 14-19 supported by DOS 4.0+