A good resource for learning about this game is Hardcore Gaming 101's introduction to Out Zone, linked below. HG101 is a great website with a huge database of information about many games. The Out Zone write-up is actually included within an article about Toaplan, the developer behind Out Zone. Find out more about Out Zone, and discover some new games from the same developer:

Out Zone: http://www.hardcoregaming101.net/toaplan/toaplan4.htm#outzone

Toaplan, Page 1: http://www.hardcoregaming101.net/toaplan/toaplan.htm