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

POKE 41987,165 
Invincibility:
Load or reset the game, then execute the following BASIC command before running or restarting the program. 

POKE 41961,165 
Unlimited weapons:
Load or reset the game, then execute the following BASIC command before running or restarting the program. 

POKE 44755,165