(On arcade game)
Why does the volcano erupt in the game? Well, one of the programmers kept telling Ed Rotberg that he really should make the volcano active... and after some time, he got tired of listening to that and told the programmer to write it, and he'd then add it to the game. And lo and behold, next day the programmer had brought him the code!
One BattleZone-related legend was that somene was able to drive up to the volcano, then fall into the crater, and find a castle there that they had explored.
The game screen was all green, but they were able to make the radar display red by placing piece of red cellophane inside the screen.
(Source of trivia: Microsoft Arcade helpfiles)
The "modern PC adaptation" is pretty good, actually. Crack dot Com was working on Golgotha, which I thought was pretty innovative (combination of RTS and FPS games), but unlike Golgotha, Battlezone was actually released commercially. =) I heard the game sold pretty poorly, but that's pretty silly because the game is still pretty good. If you can find this game from among budget releases, get it! It rocks! It's definitely worth it, even if you only get it for the funny Cold War-era jabbering... =)
(I need to play this soon again and write more of it; I just hope it works with the modern 3D accelerators...)