There are some cheat codes in Call of Duty: Black Ops for the PS3, Xbox 360, and PC that you can use to unlock various things in the game.
To enter cheat codes, you need to access the computer on the main menu. To access the computer, you need to mash the aim and shoot buttons (on PC, just mash the spacebar) until you break free of your restraints. Once you break free, walk up to one of the computers behind you and you’ll see an old DOS prompt.
Enter the following codes for unlockables:
Unlock all Intel in the game (disables achievement/trophy) – 3ARC INTEL
Unlock Dead Ops Arcade – DOA
Unlock Dead Ops Arcade and Presidential Zombie Mode – 3ARC UNLOCK
Unlock the text adventure game Zork – ZORK
There are several other commands you can use as well to view various interesting things. Type in HELP for a list of commands you can use. DIR lists files you can access using the CAT command (eg: CAT filename.txt). You can access your email by using the MAIL command. The WHO command gives you a list of login names you can use with the LOGIN command, all of which require passwords.
Here is a list of some of the passwords I’ve found so far:
User: jfkennedy
Password: lancer
User: vbush
Password: manhattan
User: lbjohnson
Password: ladybird
User: rnixon
Password: checkers
Nosing around in various email accounts, you can find passwords to other email accounts as well, so I won’t spoil your fun unless you want me to. Check out my full list of login names and passwords if you want all of them.