INT 62 u - FGDRIVER v3.03 - "FG_BOXX" - XOR HOLLOW RECTANGLE
        AX = 0008h
        BX = left column
        CX = right column
        DX = top row
        SI = bottom row
Notes:  For FGDRIVER v1.10, this function was unused and "FG_BOXX" did not
          exist yet
        The rectangle is XORed into screen space, respecting the clipping
          region, with edges of the width specified with "FG_BOXDEPTH"
          (see AX=0007h) (default = 1 is set by "FG_SETMODE")
        This function has no effect in text modes
SeeAlso: AX=0006h,AX=0007h,AX=001Fh,AX=0020h,AX=0077h

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