RoboCop Cheats
NES Cheats
Unlimited continues
Hold A + B + Select and press Start at the game over screen.
Special Continue
Normally you have limited continues, but with this trick you can keep on playing after your last restart. When Robocop dies press the 'A', 'B', and 'Select' buttons and then press 'Start' to return to the title screen where the 'Continue' option can be used again.