Some guy at gamefaqs broke the password system, and he said that he couldnt find anywhere on the rom a list of vault codes, so he assumes that its generated by using the first letter of the password as a seed.
now this is weird...
passwords that start with "A" dont work??? its like the passwords after 2000 gold, the game gives you a passoword which doesnt work, but come on, starting the game with a password that starts with "A" just to find out later that it doesnt work? that'd piss me off if i was playing it.
btw, i'm using the password hacking to warp to each level and getting the hint for each room. i also added a code to have infinite health, keys and bombs.
i just finished the game with a password that start with an "A" and nothing different happens. the code has been the longest input so far, but that must be just a coincidence.
notice the game gave me the password, but you can try for yourself, it doesnt work!!! (and no, i didnt get 2000+ gold) it even gave me vault clues, and that worked. so, when you start a gauntlet game and get an "A" type password, you will have to finish the game in one sitting or reset and get another type.
i know that because i have been generating passwords for each type using the password crack guide on gamefaqs. but, even though its not mentioned anywhere on the faq, i couldnt generate passwords starting with A. they just dont work. if i generate a password that starts with A and then change that letter and the according checksums protections, then it becomes a working password.
I think the whole "A" issue it a lazy programming error they didnt care to fix and prefered to let it there as another cheap difficulty factor of the game. they used the first letter of the password as a seed for the vault code, and the bits for A are 00000 which is probably a bogus number for a seed,
OR
as its easier to crack a password that starts with A because of the way one of the password protections was made. there are only 2 protections, and one of them is related to the first letter, maybe they simply made all A passwords functionless...