On the title screen, type one of the following and then press 'RETURN':
"DUNE"--For magic laser, speed boots, & press 'HELP' for the map
"TERMINATOR"----------------------------For ECM for both players
"LAWNMOWER"-------------------For bouncy bullets and speed boots
A voice will say {Bingo!} if you have entered the cheat correctly. Don't forget to press 'RETURN' after you enter any of the above.