I've played Zero Gunner 2 on the Dreamcast off and on for a few months. Really cool shooter. I got to play an arcade version (at an arcade) on Monday.
The game seems totally different. The levels are different, the controls are different.
The arcade version will lock onto a target when your crosshairs cross over it and your gunship will autorate to stay on the target as long as you hold down the fire button.
On the Dreamcast, you press the B button to rotate your ship around an axis point in front of the gunship.
Is there a setting (that was in Japanese, perhaps) that makes the Dreamcast version play more like the arcade version?