WHAT'S WRONG WITH SUPER MARIO BROTHERS?

In Emulators / NES ROMs

i've downloaded about 20 different Super Mario Bros. NES ROMs and every one of them plays level 0-1 no matter what, and when you beat it, it just goes back to the title screen. does any one have a rom that doesn't do that, or is it just FCEUltra?

thanks, i got a real version finally. i think this is no more than the 3rd time i've played smb1