Man, just when I got excited about my full screen 2x2 tile drawing, I found a bug when I changed rooms!
I traced it down to my room data rolling over. Stupid mistake now that I see it.
Anyway, an entire room can now be defined on the world map with one byte. The attached picture shows room 0 and room 1.
So chaining rooms (001101001) can create some huge worlds!
The scrolling engine is coming along. But still buggy. lol
Anyway, a snap shot of two rooms. (PS, I am working on reducing a room size from 220 bytes to hopefully around 160 or less).