Try:
http://www.bombjack.org/commodore/ga...ion_Manual.pdf
On further inspection, there don't seem to be any codes in there...
What sort of copy protection is it?
Oh and the bloke who writes this blog:
http://crpgaddict.blogspot.com/ has played the game, so might be a good person to ask.
Well, actually the above manual is good. Tried it out myself.