http://www.netrover.com/~timt/cheats/b/battlesquadron.html (Amiga Plus Extra No. 5/97, 05/1997)During play, type "CASTOR" for invincibility. use 'F6'-'F10' for different weapons and 'F1'-'F5' to change the weapon's power.
On the title screen, type "ELECTRONIC" for a list of options. If this doesn't work try pressing the 'SPACEBAR".