Better than the Internet.
I never turn down a good Wikipedia article. I wonder who actually made it -- Nintendo? They don't really say. Here's the part where I make a joke about an Eastern European version of a well-known SNES game.
I think the implication is that they were bootleg systems, not made by Nintendo, produced in dank factories in far-flung lands. I suppose it would be hard for Nintendo to clamp down on that sort of production.