INT 5F - HP 95LX GRAPHICS PRIMITIVES - DRAW RECTANGLE
        AH = 05h
        AL = fill type
            00h outline, using current line type and color
            01h solid, using current color
            02h pattern, using current fill mask and color
        DX,CX = row,column of other corner of rectangle
Note:   the rectangle is drawn starting at the current pen position
SeeAlso: AH=06h,AH=07h