In the ROM that I am programming ( I am a beginner at programming these ROMs and all ), I can see no place where I have defined a pattern for the background, yet, it displays various tiles from my tileset all across the screen... How and where do I specify these tiles?

And on Sprites... how do I move one of two sprites with the push of a button? I know how to capture button presses, but, how do I change the X and Y values of a sprite?

Thanks,
Matt