Hex Cheat
     Using a hex editor, look for offset ...018. The hex number is set
up  in the standard savegame way, with two digits in pairs from lowest
to  higest  place  (i.e.,  if  you  have  6000 credits, that's 1770 in
hexidecimal, and that would be laid out like this" 70 17 00" .. etc.).
Then,  you  can overwrite this offset and modify the amount of credits
you have. If you use FF FF, this translates into 65,535 credits.

Hex Ship Cheat
     If  you don't want to type in the cheat code for ships, but still
want  to  fly  the  ship  of your choice in either campaign, use a hex
editor  and  look  for the following offsets. Then, set that offset to
"01".

550C: Pegasus Interceptor
5520: Battleaxe Fighter
5510: Orion Fighter
5524: Cutlass Bomber
5514: Archangel Fighter
5528: Mace Interceptor
5518: Phoenix Heavy Bomber
552C: Warhammer Fighter
551C: Poseidon Bomber
5530: Claymore Heavy Bomber
5534: Mako Economy Fighter