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

POKE 44355,0 
Invincibility:
Load or reset the game, then execute the following BASIC command before running or restarting the program. 

POKE 44258,96 
Unlimited weapons:
Load or reset the game, then execute the following BASIC command before running or restarting the program. 

POKE 51104,0