Run the game, then hit the left button on the back of your Action Replay (or similar) cartridge and press E before entering the following codes:
POKE 28447,173 : POKE 28614,173 (unlimited credits)
POKE 31510,189 : POKE 31561,189 (enemies can't fire)
POKE 26423,0 (unlimited bullets)
POKE 33868,0 (unlimited missiles)
Once you're done, press F3 to restart the game with cheats intact.
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