CheatCodes.com has all the official Jampack Vol. 1 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 Jampack Vol. 1 are shown below.
At the MDK screen, press Triangle, Circle, Square.
At the NBA Shootout '97 screen, press Circle, Square, Triangle.
At the Machine Hunter screen, press Circle(2), Triangle.
At The Lost World screen, press Square, Triangle, Square.
At the title screen, press X or Start simultaneously on controllers one and two. Now a best two out of three match will begin.
At the Super Puzzle Fighter screen, press Square, Triangle, Circle.
At the Thunder Truck Rally screen, press Circle, Square, Circle.
At the Codename: Tenka screen, press Square, Circle, Triangle.
At the Wild Arms screen, press Triangle(2), Square.
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