Type "champie" at the title screen. Then press the keys for the desired effects.

Code - Effect

Press [F9] - Press a number from 1-5
Press [F4] - Set delay value
Press [F1] - Set drain value
Press [F7] - Set gain per frame
Press [F6] - Set machine delay value
Press [F3] - Set machine drain value
Press [F8] - Set maximum ship speed
Press [F5] - Set rapid delay value
Press [F2] - Set rapid drain value
Press [F10] - Switch between screens