After the countdown, type "GERRINTAETHUM". Now use the following keys:
'T'---------------Add time
'U'----Jump to Los Angeles
'G'--------------Game over
'F'------------Show ending
'N'-----Jump to next stage
'B'--Restart current stage
'1'-'9'-------Stage select
The next two did not work on my version, but may work on others.
After the countdown, type in "WEARPEEPEL". Now to get more turbos press 'D', press 'F' to see the ending, or 'G' to lose a credit.
Pause the game, press