I didn't even know it existed until I stumbled a pic of it from a recent site that I've been browsing..
they have hotlinking disabled but you can see it [URL="http://watler.prohosts.org/snes/Snesstik.htm"]here[/URL].
Yup its true I have one like that for the original NES.It is called for the NES"Nintendo NES ADVANTAGE.Its usually a great tool for racing games.But for the SNES its called Nintendo Super Nintendo Advantage.
I still have one of those. Don't remember where or why I got it. I hardly ever used it unless I wanted to put myself at a disadvantage.