the wide boy 64 was a device made by intelligent systems, the same people who made the wario ware games. it could allow you to play Gameboy and Gameboy color games on a Nintendo 64. it was a lot like the game boy player for the gamecube, but let you take screen shots. this was mainly marketed at the press, and you could not purchase it at normal stores. like the Gameboy player, it had a border that mimics the Gameboy color. so why did it not catch on until the Gameboy player came out?
so, did it change gaming? not at all! it was too expensive, and was only sold to a few people. so the lesion here is: don't make something that can play games on another system if it costs more then both of them!