I have a 3DS and I want to install an Atari emulator to play some old games (Boulder Dash, River Rider). I have read that I need a flash cartridge(such as the R4), but I am still not sure how these carts work. My questions are:
Do I really need flash cartridge to play on an Atari emulator(I.E. StellaDS) on my 3DS?
Is it possible to run the emulator from an SD card?
Do I have to flash my 3DS with some special software to be able to run an emulator on a flash cartridge?