Only mapper 0 ROMS are supported, and to change the NES ROM you simply have to replace it at the 512th Kilobyte of the Megadrive ROM of the emulator.
Interested? Get it at http://tails92.sepwich.com/files/megadr ... inball.zip
Nintendo Pinball is included. It "runs" at 1fps. Unplayable, though.
If I remember well one of the red strings in the top-left corner should be the program counter.
Enjoy.

P.S: And this is not reposting, everyone knows what small room their personal website is
