Hacking Sequential codes PSX

[jin299]

Helder, there's a code I was hoping you could provide me with some help on, in the game Street Fighter Ex2 Plus, there's a unselectable boss that can only be selected via a cheat device, the bosses name is Bison II which differs from the normal Bison in the game in the sense, that this Bison is a lot stronger, has his own special intro, and fights in a special white costume, which the computer controlled player can only use, now as I said before the human controlled player can play as the Bison II with assistance of a cheat device however the human controlled bison II fight in Bison's normal costume, and doesn't peform Cpu Bison II special intro, so my question is how do we find the flag code, that allows the human controlled Bison II perform cpu Bison II's intro, which would then allow the human controlled Bison II fight in his white costume?

[Helder]

Find the color mod for the character which is easy since all you do is choose the character with a different button to choose colors. Another way is use a character modifier for say P2 and see what the values are for when you fight him that are around the character modifier code and compare to a standard Bison to see the differences.

[jin299]

Helder, when I've found the character modifier code for player 2, do I change the values to that of Bison II and then fight him and then look at the values or do I leave the values as they are for the character modifier code, then Fight Bison II and look at the values?

[lee4]

Street Fighter EX2 Plus (NTSC-U)
http://gamehacking.org/?game=89931
There are already the Character Modifier & Costume Modifier codes
Sound like you want find for moveset modifier

[jin299]

That's the thing I already know that, I have tried a moveset in the past and all it does is allow the player to do his intro during the match, so that's no help, I was thinking this could be a flag code, that involves switching from 0 and 1 but I'm unsure, could you look into it for me man?

[jin299]

Helder, could you look into the code for me? because I have tried everything to try and hack the code but haven't been successful.

[jin299]

Helder, I was talking to Hacker Abystus, about how to hack the code and here's what he said.

Re: Re:Hacking PSX
You need to find an emulator with a debugger. Hack the ram code that controls whether the cpu or player has control of the character. Then in the debuggger, set a breakpoint for read of that address while the match is loading (before you get to fight). When you find the game code comparing the value at that address to 0, you need to make the code always go the way as if the cpu is controlling the character (even though your ram code says otherwise). One of those checks will be for the intro/costume.

So is there any chance you could hack the code?

[Helder]

Of course there is a chance but I need time and motivation to do it. Why not give it a shot yourself? I don't mind helping but how can you learn if you give up before even attempting it?

[jin299]

Okay I'll try and hack the code, now there's a problem I'm having hacking a code, for Street fighter Alpha 3,

No charge on attacks player 1
D11945D8 0000
50000208 0000
801945D8 0102

I tried hacking this code but couldn't find the correct address value's for the code, first I searched 16 bit code type , then I did unknown search, next I held the right button back for a second and then did a greater than search, but by the time I had carried out the, instruction, the code addresses had already fully loaded in the cheat engine? I didn't get a chance to follow the rest of the steps through, any idea why this problem keeps on occurring?

[Helder]

Looking at that code I see a conditional and a slide code which covers a bunch of addresses, so that Conditional is probably only active while in a battle and then it writes to a bunch of addresses which looks like 8 addresses:

801945D8 0102
801945DA 0102
801945DC 0102
801945DE 0102
801945E0 0102
801945E2 0102
801945E4 0102
801945E6 0102

so what I would do is fire up a good PSX emulator with a Memory viewer or attach Artmoney to a PSX emulator and look at those addresses in real time when you charge a direction to see what is going on and learn how to search for it by observing whats happening.

[jin299]

Right I found the first right address of the code which is 801945D8 0102, except I don't understand how do you know that there eight addresses in total for the code, basically what I mean is how did you know where the code starts and where it ends?

also I couldn't seem to find the rest of the other addresses of the code in the memory viewer? why is this.

[lee4]

Helder post 5 codetype breakdown example on post#2

[jin299]

Hey again, I have a question to ask you Helder about a code for Street Fighter Alpha 3.

Any ideas on how this code was hacked, the code itself allows player 1 to play as Shin Bison, which in the game is a much powerful version of the original Bison, the difference between the 2 variations, are shin bison comes preloaded with, a new fight intro animation a new strong fierce heavy punch, along with a special new super combo.

8009443E 0F00

[Helder]

I tried to hack the same code for the Saturn version but had no luck but seeing the address running in real time and seeing what changes it is the best method how it might have been hacked. The lesson from this topic is to theorize how to tackle the code and observing data to figure out whats going on in memory, I will probably take a look at it so I can apply what I learn from this version to the Saturn version.

[jin299]

Right so any idea how the hacker actually managed to hack the code with a memory scanner?

Also when you mean by viewing the memory addresses in real time, do you mean looking at the values of a code address in art money while performing an certain action in the game example take the code no charge for an well to find the values of the address for the first part of the codes address we would hold the down back button for two seconds while
in the fight and then take a look at the values of the address in art money to see the correct values that correspond to that code, is that what you meant by analyzing the values of a address in real time?