devkitPro

ok, i have an way to load a map, tileset and the palette out of a txt file into the vram. but i think it is not the correct way. so does anyone knows here how tilesets and tilemap work exactly, and could you please explain?

This is probably the best read you're going to find on that:

http://www.dev-scene.com/NDS/Tutorials_Day_4

thanks i will look there