Trip Hawkins, who has little to do with the current EA, was pretty vehement that Antonick deserved nothing. Many programmers got royalties back then (see Todd Frye - 2600 Pac-Man), but almost always on only the game they did. It's not like he designed the game for his own company, he was working for EA. If I design a game, and get no royalty agreement, they can sell that game and 10 sequels and legally I am entitled to nothing.

I think he made out quite well, because the 1988 game is almost unrecognizable compared to the 16-bit 1990 game.