Theres a slot on the bottom of the console whats it for?
On the bottom of my SNES console there is a slot for something but i have no clue what. it has a protective cover and on the cover is simply the letters EXT. I am guessing its for some type of extension....Ho
Nothing. It was originally put in by Nintendo with the anticipation that something would go there as an add on later that they could sell. In Japan the only thing was the Stellaview but that never came to America. They later added Extention ports to the N64, again only in Japan this is the 64DD short for Disk Drive and didn't leave Japan due to it being a commercial failure. Other EXTention ports can be found on the Gameboy, Virtual Boy, and Gamecube. All with the idea of system connectivity and post-release peripherals.
To reiterate, it doesn't do anything. Not in NTSC anyway.