High Quality Content by WIKIPEDIA articles! As part of the overall plan for the Super Nintendo Entertainment System, rather than include an expensive CPU that would still become obsolete in a few years, the hardware designers made it easy to interface special coprocessor chips to the console. Rather than require a console upgrade, these enhancement chips were included inside the plug-in game cartridges. The presence of an enhancement chip is most often indicated by the presence of 16 additional pins on the cartridge card edge.