I'm slowly working on getting Nova the Squirrel 2 to display some stuff using my own infrastructure. I've got a palette but I'd very much like to upload some tiles too.
It works now. I was storing the wrong register when I meant to store the accumulator, and it was a copy and paste issue. I have a directory of graphic files in the ROM now, where I can specify one to upload. Now I have to make some mechanism for uploading palettes. Maybe that calls for a separate list.
