Take a look at this video: To make it short: This guy has found a working US version of 64DD. It came with developer floppy. The 64DD can't read it without a special developer's cardridge (which still exist, but these cardridges are very, very rare). I thought about it, and it would be nice if someone gave him the dev cartridge, but they're probably too expensive and noone would do it. But maybe there is some way to dump it? And no, I'm not this guy, but maybe with help of the modding community we could take a small look at what's inside this floppy. It can contain almost every game that Nintendo has announced for 64DD, this includes: EarthBound 64, Fire Emblem 64, Ura Zelda.