2 versions exist – 16K (cart and cassette – pictures #1-#6) and 32K (disk – pictures #7-#12).  The 32K version has different credits, a better title screen, missiles that launch from the silos, ships in space that change size, and a larger Zaxxon robot.  Also, the 32K Zaxxon needs to be shot in the missile to destroy it; the 16K version merely needs to be shot.  The Datasoft version has some extra text - “Player (I)” or Player (II)” (picture #12).

Lacks the satellites that fly by in space.

BUG: When the player’s ship explodes in the cartridge version, it always appears in the bottom-center of the screen, regardless of where the ship was located.

BUG: Your ship will sometimes explode if you fly over a certain area that looks clear of enemies.  This has been confirmed to be a bug in the program, possibly with the collision-detection.

BUG: A small line appears above your ship at the very top of the screen.



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