I'm guessing by script, you are referring to the game text?
If that's the case, AFAIK, most games use their own unique code for storing text, I haven't seen many use ASCII. I'm pretty sure it would be impossible to determine this code without doing some hexing. Because of that it would probably also be impossible to determine where the script is. Most people seem to obtain the code by getting a long word from a game and doing what is called a Relative Search. This would look through the entire ROM and find all possible instances of that string for all the codes. Like A = 0, B = 1, and then, A = 1, B = 2, like that. Usually you would need to find a word that only returns a few results and then there are certain assumptions you can make, but I think I've gone far enough.
If you weren't referring to the text, then ignore this little piece of gibberish

.