sentences:  The central processing unit in these games allowed for more complexity than earlier discrete-circuitry games such as Atari's "Pong" (1972).During the late 1970s video-arcade game technology had become sophisticated enough to offer good-quality graphics and sounds, but it remained fairly basic (realistic images and full motion video were not yet available, and only a few games used spoken voice) and so the success of a game had to rely on simple and fun gameplay.This emphasis on the gameplay explains why many of these games continue to be enjoyed , despite the progress made by modern computing technology.