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:

 7 6 5 4 3 2 1 0 
     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).

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