Codes
1 D16C-0D0D Start with half energy--1st life
2 D161-AF0D Start with half energy--after 1st life
3 C22C-AF08 Almost infinite energy
4 7DA8-C7DC Gun power-ups worth 30
5 D9A8-C7DC Gun power-ups worth 5
7 C267-A70D Infinite lives
8 DF6C-040D Start with 2 life
9 D76C-040D Start with 4 lives
10 DB6C-040D Start with 10 lives
11 82EA-A4D1 1 hit and you're invincible
12 DDEA-AFA1 + DDA0-04A8 Everyone is invincible--including enemies