Alekmaul's Atari 4200 emulator for the Nintendo DS and DSi, a5200DS is now up at version 1.5. This emulator is based on the source code of Atari800, and in order for you successfully use it, you must use compatibles rom with a52/bin format. Apart from that, you'll also need the 5200.bin rom bios.

For the changelog of version 1.5:

* Fix bug in GTIA/POKEY for enabling pot management, analog jostick works now
* Compiled with new devkitpro (r33), win 1 fps since previous version

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How tu use a5200DS :
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YOU NEED PERHAPS TO PATCH THE NDS FILE WITH THE DLDI PATCH BEFORE USING IT.A 
Unzip a5200DS.nds from the a5200DS.zip archive in a directory of your flash / (micro) SDA 
/ MMC card.
Put the a26/bin files where you want on your flashcard.A 

That's all, a5200DS can be use now :) !

When the emulator starts, click on the cartridge slot to choose a file. you are use Up/DownA 
to select a file, then use A to load it.

Controls :
* Direction pad : the joystick ...
* A : Fire button 1
* B : Shift button
* X : * button
* Y : # button
* R : button 0
* L : show fps
* R & L : change rom
* START : START button
* SELECT : Pause button

Use stylus on buttons for other actions on bottom screen.