When in space combat, fire your phasers and torpeoes at the enemy vessel. Then press 'D' to get Scotty on the damage control. All the action stops, but your phasers and torpedoes will still recharge. When the action begins again you will be able to fire at the target straight away. Repeat this process a few times and your enemy will not last long.
Enter "INTRODUCTION" for the password, and stage one will be completed, and you'll have 14 lives and are powered with the three way shot, bouncer and buster. To skip a stage, quit the game while on the stage you want to skip, and start the game again. You will now find that the stage has been completed for you.
Enter "BNTRODUCTINM" for the password, and level one will be completed and you will move on to the 3d section.
1-"BCQQAAAAAGGN"
2-"CCSAQAAAALOO"
3-"DDSAQAASANMN"
4-"EDSAQAQTANKM"