While sitting in the chair at the main menu, begin hitting both triggers rapidly. You will be able to stand up and walk around the room. Walk behind the chair and access the terminal. Type in "Zork". You will then be awarded an achievement/trophy.
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Nothing,all ZORK does is give you an achievement.
First you have to get out of the chair then walk around until you find the computer then enter zork
3arc unlock 3arc intel zork doa
if you mean on the computer there is doa dead ops arcade zork which lets you talk to the computer
If you type in 'zork' into the terminal when you get out of the chair, you'll get to play the old game zork. It's basically a text-based adventure game. You can play by saying stuff like 'LOOK door', etc.