I picked up a used PAR3, but it didn't come with a manual so I was wondering what some of the features do.

The PAR2/PAR 3 has a Dead Code generator, but I have no clue how it works, other than you enter DEADCODE as the code and a bunch of lines after that. Does the manual say anything about the code format and how to generate it?

After entering a code, you can toggle the code ON, OFF, but also A and B (what are those 2 for, in-game activation?)

Is there any other features that one would only know from reading the manual?

Also, is there a way to save your own codes to it ala the PSX gameshark? (that was probably just a rumor)