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:

          ║   │r│g│b│R│G│B║             Note: R,G,B are 2/3-intensity
          ╙─┴─┴╥┴╥┴╥┴╥┴╥┴╥╜ 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