Z
???Can the r4-ultra play roms other than just NDS ones?
T
By using Emulators built for the DS, you can emulator older systems. Gameboy/Gameboy Color, SNES, NES, Sega, etc.
https://www.romulation.org/forum/index.php?topic=5002.0By using a Slot 2 (GBA Slot) card, like the EZFlash 3 in 1, you can play GBA games on your DS.
http://www.dealextreme.com/details.dx/sku.2967