Here is an attempt at background scolling. I thought it might be useful to others. Let me know if you see any bugs.

Thanks! I'm really new to coding, can I input an image as a bg or have to use it as a data file?

You can load an image and put it on the drawing page with something like the attached. If you just want to change the background tileset you could add something like load "grp5:<filename>", false. The background would ideally not just be random stuff too. You would be better of reading that from file or data statements instead.

Okay this great! Are image values always GRP5? What do you mean reading the bg from file or data statements?

I think background tiles are grp5, and sprite images are grp4. I was just saying you would want to have a background layout that was purposeful instead of just random tiles.