This section started by Andreas Koch.

- some 80 column interfaces made by Atari and third parties. Although 
  these interfaces are there to provide a better text display with 80 
  chars. per line, they can somehow be used as a simple graphic 
  enhancement; think I have seen a graphic demo for the XEP-80 device 
  somewhere, that used a higher graphic resolution in Gr. 0 or Gr. 8 
  and also provided some animation (not only text, but also graphics), 
  alas I don`t remember the name of that demo...;
- Antic and GTIA upgrade by Chuck Steinman. As far as I
  know, an article about that topic appeared in Atari Classic, since I do
  not own it, I can merely speculate that it adds a second Antic and GTIA
  for higher resolution and/or more colors...;
- many self-made upgrades, using graphic chips or graphic cards from other
  computers...