I assume one of the first undocumented effects on the VIC-II was the ability to display sprites in the (upper and lower) border area. I wonder how and when this was first discovered and used? Was it in a game, in an intro or a demo?
There was an article in the german 64'er magazine 12/1985 (pages 76/77) describing how to put sprites into lower/top border including a type-in listing. The article states also that no game has used this technique so far. As author of the article Holger Gehrmann was given, together with Achim Hübner as editor. The program is called
Hyperscreen and was written by Holger Gehrmann.