INT 10H 1001H: Set Overscan/Border Color Register

                                                      Compatibility: EGA VGA
 Expects: AX    1001H
          BH    6-bit RGB color to display for that attribute
          
 Returns: (none)
          
    Info: This sets the EGA/VGA screen border to a specific rgbRGB color.

       BH is a 6-bit rgbRGB color setting, as follows:

          76543210
             rgbRGB             Note: R,G,B are 2/3-intensity
          ҽ bit               r,g,b are 1/3-intensity
                    > 0: 01H Blue
                   > 1: 02H Green
                  > 2: 04H Red
                 > 3: 08H blue'
                > 4: 10H green' (also CGA-emulation intensity)
               > 5: 20H red'

   Notes:  To make the border color match a particular video attribute,
            you may use need to use INT 10H 1007H (read one palette
            register) to obtain the rgbRGB setting for that attribute.

           The CGA-compatible fn, INT 10H 0bH also sets the border color.

           The EGA/VGA overscan area is so anemic, that it is probably
            best to leave this as 00H (black).

See Also: INT 10H 10H: EGA/VGA Palette Functions
          INT 10H: Video Services
          EGA/VGA Data Areas
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