Star Trek: Tactical Assault

Klingon campaign:
When you are at the main menu, press Up, Down, Left, Right, Select, Start,
Triangle. If the code is acceped, you will hear a sound.

Unlock all ships for Multiplayer and Skirmish modes:
When you are at the skirmish screen, press Up, Down, Left, Right, Select,
Start, Square.

Bonus crew upgrades:
When you are at the crew screen, press Up, Down, Left, Right, Select, Start,
Select to get five promotion points.

Select any mission:
When you are at the briefing screen, press Up, Down, Left, Right, Select,
Start, Start. Now press L or R to select any mission.

Unlock all ships in all missions:
When you are at the main menu, press Up, Down, Left, Right, Select, Start, X
to access to all ships in all missions.