Typically, you need to find the emulator you want to work with, and follow the instructions from there...
Here's a quickie for emulation on the DS using the Datel Games 'n Music...
For SNEmulDS, an SNES emulator :
Download the emulator...
Copy the .nds file for that program onto the root directory of your game card (basically, not in any folder)
On the root of the card, create a folder and name it "SNES" (obviously without the quotes)
Copy your SNES ROMS into that folder. Make sure that none of them exceed 4MB.....
That's all the setup.
From there you can just launch the emulator like you would any game.
For jenesisDS (a Sega Genesis emulator), setup is similar, except the program doesn't care where you put your ROMS. However, the 4MB limit is there as well....
I believe that the Datel site has a FAQ for all of this.
Bookmarks