Code.     Key in...                                        Effect.

1.             PAUGVILA                                    Start with 1 life.
2.             TAUGVILA                                    Start with 6 lives.
3.             PAUGVILE                                     Start with 9 lives.
4.             PVXKKKLI                                     Start at last mission reached.
5.             TPVAPXYE                                    Start with 30 missiles.
6.             IZVAPXYE                                     Start with 45 missiles.
7.             GXSZAPVG                                   Start with infinite missiles.
8.             IEVAISYA                                      Sets missiles to 5 when you refuel.
9.             TOVAISYE                                     Sets missiles to 30 when you refuel.