"Improvements to the initial General Instruments AY-3-8500 (PONG) chip resulted in more game variations. Manufacturers included the new chip(s) on cartridges. This eliminated the need to develop a new system for every chip and significantly drove down cost. There were a total of eight chip variations that were produced and the pin-out cartridges contained up to 10 games."
The initial models outputed the games in black and white. Advancements lead to color (4 colors) and sound.
