Note: Apparently, upon entering the 'Infinite Weapon Power ' codes, you start the game with that weapon.

Infinite Health:
800791BC 00C8

Have Pistol:
800830C6 0040

Have M60:
800830C8 0040

Have Anum Bomb:
800830CA 0040

Have Flame Thrower:
800830CC 0040

Have Cobra Staff:
800830CE 0040

Ring Of Ra:
800830D0 0100

Manacle:
800830D2 013C

Infinite Weapon Power - Pistol:
800830C6 003C

Infinite Weapon Power - M60:
800830C8 0032

Infinite Weapon Power - Atum Bomb:
800830CA 0014

Infinite Weapon Power - Flame Thrower:
800830CC 003C

Infinite Weapon Power - Cobra Staff:
800830CE 0014