This isn't the most original design, but I found it very useful so I cleaned it up a bit and fitted a piston display. I think the RDF uses something like this, so kudos to them for being innovative. The display is fitted with a compact vertical decoder that will convert binary into something the display can understand. You can input binary numbers with the 4 levers in the back, or remove them and hook the inputs up to a calculator or cpu. The lever's left position is 1, its right is zero, and make sure to read them from left to right (while facing them.) I have it labeled, and the screen shots explain it more. Hope this helps somebody out and if people need questions or help feel free to ask.