improved 7 segment display

As discussed elsewhere in this issue, it is possible to distinctly improve the read- ability of ?-segment numeric displays by adding an extra stroke at the top of a six and at the bottom of a nine. The other circuit uses two transistors to achieve this; however, in digital circuits one often has a few gates "left over" because the integrated circuits are not fully used. In this case it is more attractive to use these extra gates to achieve the improved readability.