
Well, now you can play an exact (almost) copy on your computer!

TO PLAY:
1. Extract both zip files.
2. Go into the Virtua folder and double click the "VirtuaNES.exe" file in there.
3: A window with a black screen will appear. Go to File > Open and open the .nes file found in the Super Mario Bros folder you extracted.
4: The game should start up and you're ready to play!

THE CONTROLS:
These are the controls you need to know. They might be hard to get used to, but they will be a cinch after a while. Press Start at the title screen to play. (The title screen is a little different, but other than that, it's a perfect copy.)
Z: Run/Shoot Fireballs
X: Jump
Enter/Return: Start/Pause
S: Save State (Useful for insanely hard things like in IWBTG.)
L: Load State
The VirtuaNES emulator is equipped with hundreds of Game Genie codes that I managed to find on the internet. I haven't tested every single one of them, though. Game Genie codes will alter the gameplay of the game. When you exit the VirtuaNES window and open it again, the codes will be turned off.
To use Game Genie codes, go to Tools > Game Genie and a menu of cheat codes will come up which I sorted into categories so you can easily find a certain type of cheat. I recommend you don't use the Game Genie codes until you get used to using the VirtuaNES emulator first.
Enjoy!

NOTE: Once this topic gets a few replies, I'll post some really cool stuff for the NES Super Mario Brothers.
Here is the ROM and the VirtuaNES emulator:
EDIT: The download for the ROM has been deleted. Google "super mary [p1][!].nes rom" (without the "s) and click on the 3rdish result. The ROM is called super mary [p1][!]. It's found by the bottom of the list. Download that.