How do you get zombie maps for black ops 1 on ps3?

To unlock all three zombie maps on Black Ops, on he main menu, repeatedly tap R1 and L1 to get out of your chair. Then go to the terminal to your left. Once there, enter the code "3ARC UNLOCK" to unlock the zombie map "Five" and "Dead Ops Arcade". I hope this helped!

~Q6F14~