Radio Security Problem

I have a 1994 Mitsubishi 3000GT. For some reason the CD/Radio/Cassette player now shows a message, and this is it: cODE. Now the whole thing doesn't work, and it is asking for a four-digit code, which I don't have, since I just recently bought the car from a used car dealership. I called a local dealership about what to do, and I was told that I needed the specific code that comes with the car. I don't have any idea what to do to obtain the code, and if anyone on this site knows how I might do this, I would really be appreciative.

Thanks.

a mitsu dealership can fix that for you, you just need to take the radio out and get them the serial# on the back. Its either that or you have 9999 guesses to make.

Lol, I'd rather not take the time to guess. Do you think that a Dodge dealer might be able to do the same thing since the Stealth and GT are basically the same car?