INT 62 u - FGDRIVER v3.03 - "FG_DRAWX" - XOR SOLID LINE TO ABSOLUTE POSITION
        AX = 0020h
        BX = endpoint column
        CX = endpoint row
Desc:   draw a solid line, XORing each pixel onto the screen
Notes:  For FGDRIVER v1.10, this function was "FG_GETPIXEL" (see AX=0041h);
          "FG_DRAWX" did not exist yet
        This call is ignored in text modes
        The starting point is the current graphics cursor position; the cursor
          position is updated
SeeAlso: AX=001Bh,AX=001Fh,AX=0076h

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