OK, my code is tested and works. On emulators at least, but it's pretty much fool-proof (other than the timing, which can be adjusted if needed). You can barely see the attribute update in my posted ROM, but it's there.

I wrote a doc to show the data format my display code uses. If the doc doesn't explain something well enough, just ask.
http://mywebpages.comcast.net/memblers/fau.txt
Laughy, do you think you can convert graphics to this format? Or anyone else who wants to do it.