VIRUS:

        Hold down 'ENTER' (Keypad) and 'P', keep holding 'ENTER' then press
        'O'.  Now use the following keys:

                    'F'_______________________________Refuel.
                    'O'___________________Activate demo mode.
                    'L'___________________________More lives.
                    'N'______________________Resume the game.
                    'C'______________Special effect on & off.
                    'D'__________________________Demo on/off.