Well an interesting hack (of a hack) was pirated / imported games couldn't be played because they didn't have a specific chip. They did have splitters so you to

Well an interesting hack (of a hack) was pirated / imported games couldn't be played because they didn't have a specific chip. They did have splitters so you took the chip signal from a genuine cart, and the other game plugged in the other port. So you could have your camera and printer.