Pong decoded

Here the circuitry to display the score has been added. It uses a 7-segment LED decoder to convert the digits into segments that can be displayed on the screen with some logic. Some additional logic makes sure that the decoder's blank input is low if we're not in the correct place on the screen... More here.

I literally have no idea what most of the content means, but I loved the game when I was a kid and I enjoy seeing the complexity within something that looks so simple on the surface.