Cheat Engine

magellenproject

Hello I am not sure whether this has or has not been covered. But I am kind of an impasse in my learning, I am most likely, nowhere near as smart as some of the Clever people on this forum by a long shot.

I was trying to write an ASM script to give me increased SETA in X3 - Reunion, but I dont really understand ASM or opcodes all too well. I have read a fair few of the tutorials and I have probably made a tiny bit of progress from what I have learnt from the ones I have thus far read.

It looks like the game X3 - Reunion may(from my perspective) use CRC. (I know its an old game, my good computer blew-up years ago, and I haven't been able to play my old games.)
But I am not sure.
The reason I am not sure, is because I am not sure what constitutes CRC.
Whenever i change the (value) of bytes on the left pane, and I ALT+TAB back into the game in clean-crashes back to the desktop, and all the Hex values red-over.

As a made-up example in the game "Prey" if i were to change:
90 40 21 mov eax,1EF
to
90 40 22 mov ebx,1EF
and the above function didn't change the value of a critical function, or be accessed by any other critical functions then that game wouldn't crash.

What I mean to say is unlike "prey" where I can change its opcodes as long as I dont change the byte length of they're respective hex(in the left panel), "X3 - Reunion" doesn't even like it if I change anything like the value of one, single byte, let alone the opcodes byte length.
You have to put a jmp :whatever: somewhere don't you, to divert it to your script?
But X3 - Reunion seems to be different, despite there only being a year between the two titles.

Is the above mentioned example a sign of CRC, i mean I know the byte (length) cant change without corruption, but can the byte (values) of the opcodes?

Nibelton · Posted: Wed Nov 23, 2011 11:31 am Post subject:

ReOnion suck hard comparing to X3:TC
>Play TC
>Use this
>???
>Profit.

Geri · Moderator Reputation: 112 Joined: 05 Feb 2010 Posts: 5627

Probably not. Recifense has posted a script for X3: TC here:
http://forum.cheatengine.org/viewtopic.php?t=539044

And he didn't include any CRC checks. Probably you are just making a mistake when you are changing the code. I doubt that X3 has CRC checks.

magellenproject · Posted: Wed Nov 23, 2011 6:29 pm Post subject:

Geri · Moderator Reputation: 112 Joined: 05 Feb 2010 Posts: 5627

Just open an AA window and copy-paste the script in it.

magellenproject · Posted: Thu Nov 24, 2011 7:11 pm Post subject:

Geri · Moderator Reputation: 112 Joined: 05 Feb 2010 Posts: 5627

The memory integrity checks have nothing to do with the values that you search for. They are checking the codes only.

I didn't say that the developers did not put any anti-cheat or make it harder to find values, that is just natural.

All I say is that the game is not detecting if you are changing the codes. Which is not the same as if you change a value that you find.

magellenproject · Posted: Thu Nov 24, 2011 7:43 pm Post subject:

Why do game developers put memory integrity checks in they're games, if when the game is being used in singleplayer. Confused

And also what motivation would a games developer have for making it difficult for someone to play the game outside of the way it was intended?

Seems a bit mean.

What goes through they're minds? Confused

Dark Byte · Posted: Thu Nov 24, 2011 7:56 pm Post subject:

Try looking for 2 byte values with fastscan off

And try increased/decreased with that

But really, check out http://forum.cheatengine.org/viewtopic.php?t=539044

There's something about a multiplication of 65536, but that's just a result of misalignment

Geri · Moderator Reputation: 112 Joined: 05 Feb 2010 Posts: 5627

Recifense · Posted: Tue Dec 13, 2011 1:18 pm Post subject:

Hi guys,

The scripts and tables were re-uploaded.

Cheers!