Arnie
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Unlimited lives:
Load or reset the game, then execute the following BASIC command before running or restarting the program. 

POKE 13270,173 
Unlimited shots:
Load or reset the game, then execute the following BASIC command before running or restarting the program. 

POKE 14022,173 
Invincibility:
Load or reset the game, then execute the following BASIC commands before running or restarting the program. 

POKE 13603,169
POKE 13604,0
POKE 13605,234
POKE 13606,234
POKE 13607,131 