INT 62 u - FGDRIVER v3.03 - "FG_DASHREL" - DRAW DASHED LINE TO RELATVE POSITION
        AX = 0015h
        BX = endpoint column offset
        CX = endpoint row offset
        DX = dash pattern (set bits cause drawn pixels)
Notes:  For FGDRIVER v1.10, this function was "FG_GETCOLOR" (see AX=0034h);
          "FG_DASHREL" was AX=0028h
        This call is ignored in text modes
        The starting point is the current graphics cursor position; the cursor
          position is updated
SeeAlso: AX=0014h,AX=001Ch,AX=0076h

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