In the middle of the summer, Sofmachine was contacted by Atarisoft. Atarisoft had been buying the rights to port the popular full-size arcade games to game consoles and home computers of the day. And Atarisoft wanted us to convert three games: Jungle Hunt, Pole Position, and Vangard. We agreed to do so, at $35,000 for each game — except for Pole Position, which we managed to get $50,000 to do. So we started coding in earnest. We finished both Jungle Hunt and Pole Position at the end of 1983. About midway through the Vangard project, which I was doing, Atarisoft cancelled the project and agreed to pay half of the $35,000.
ref.: Game Programming All in One