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Playstation - Gunship 2000 cheats

Invincibile mode
After you received the mission orders, hold L1 + L2 + R1 + R2
during the loading screen. Keep held the buttons the entire 
loading of the game. If the code is accepted, the "Cheat" 
message will appear on the mission screen.

Unlimited ammunition
After you received the mission orders, hold L1 + L2 + R2 + X 
during the loading screen. Keep held the buttons the entire 
loading of the game. If the code is accepted, the "Cheat" 
message will appear on the mission screen.