Sound is present since videogames are such. From little beeps to the complex, positional digital audio system nowadays. Sound effects and music in the digital entertainment have come a long way, and so the necessary hardware has.
Among the electronic circuits that have made possible the sound aspect of the digital world there are really notable ones. Because the melodies they have been written for, the impact in the gaming (or general) culture, its capacities or simply because the leap they meant. As the dumb lists enthusiast I am, here is a list of some which, in my judgement, are the most interesting and deserve to be remembered.