CheatCodes.com has all the official Madden NFL '97 PSX cheats to unlock everything. If you know of any that we don't have, please let us know.
All published and official codes as of Saturday May 18, 2013 for Madden NFL '97 are shown below.
Start an exhibition game. Select any two teams and the controller options. Then, enter "TIBURON" as a user record name and press X to accept. Press Circle to return to the team select page, where there will be 8 more teams available: AFC Pro Bowl, NFC Pro Bowl, All-Time All-Madden, All '60s, All '70s, All '80s, EA Sports, and Tiburon. The hidden teams may also eventually be selected randomly by holding L2 + R2 in exhibition mode.
When the black screen with the PlayStation logo appears during the loading of the game, hold R1 or R2. If you entered the code correctly, a screen titled "Cinematics" will appear instead of the title screen. Then the winning, losing and Super Bowl FMV sequences may be viewed.
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