http://www.netrover.com/~timt/cheats/r/robocopiii.html (Amiga Plus Extra No. 5/97, 05/1997)Hold down the 'SHIFT' key (either one) and type "THE DIDY MEN". Press 'ESC' to skip levels.
During the {jet-pack round} push the RIGHT SHIFT key and type "MY FRIEND BILL" to activate the cheat mode. (If you do it right, you will get to see a limmerick.)