Cheat Engine

KareemOWheat · How do I cheat? Reputation: 0 Joined: 10 Oct 2012 Posts: 5

I'm playing an rpg on epsxe, and I want to make an experience multiplier for the game since I cant seem to find one on the internet, and grinding exp is boring.
I've found a few topics relating to exp multipliers, but none really take me through the process of how to do it in a way I can understand anyway. I get as far as attempting to inject code, but I have little to no idea what I'm doing there.

Any help with this problem, or even pointing me toward a tutorial, would be greatly appreciated!

Gniarf · Posted: Wed Jul 17, 2013 1:09 am Post subject:

Since you're using an emulator code injection will most likely be fairly complicated. Instead I recommend you start by finding a pointer to your xp (or one xp pointer per character if it's a party rpg). Cheat engine's tutorial (help->cheat engine tutorial) step 6 gives you a good method to find pointers in emulator games (and a bad method for other games).

Once you have a pointer that always work, make a lua script with a timer that will periodically read your xp, compare it with its previous (stored) value and give you several times the difference.

Look at C:\Program Files (x86)\Cheat Engine 6.3\main.lua for help on some CE lua functions. You'll probably need readInteger, createTimer, and writeInteger (unless your xp is stored as a float or double).

Edit: still, you're going to use "find out what access/write..." anyway, so could you post an instruction that writes your xp ( square brackets [] are in the left side of the comma , if any) along with the information in the bottom pane (EAX=..., EBX=..., etc)? There might be a shortcut.
Also how many instructions (line in the upper pane) access your xp (only 2 would be ideal)?

KareemOWheat · How do I cheat? Reputation: 0 Joined: 10 Oct 2012 Posts: 5

I've made a lua script, and it's servicable, but not exactly what I was looking for.

As for the instructions that access my exp, I have 11. As for what writes to it, there are only 3.

Edit: Upon further inspection, 4 run when my post battle exp is actually added however the counters on all of them are anywhere from 4-1. The other 6 run when zeroing out the exp just before the new value is added, and one appears rapidly increasing on par with the frame rate, so I'm guessing it's being accessed by the screen draw?

As for what is writing to it, only 1 instruction writes, but it appears to run the instruction 4 times.

The instructions that access the post battle exp value:

Run 4 times

Gniarf · Posted: Wed Jul 17, 2013 2:47 pm Post subject:

KareemOWheat · How do I cheat? Reputation: 0 Joined: 10 Oct 2012 Posts: 5

Gniarf · Posted: Wed Jul 17, 2013 4:39 pm Post subject:

KareemOWheat · How do I cheat? Reputation: 0 Joined: 10 Oct 2012 Posts: 5

You were right about the grey state, I misread what you wrote on that.

My problem now is that when this script is active, my game freezes in battles, and causes some foreground elements to flicker pink while not it battle sequences.

Any idea on what might be causing that?

Thank you for all the help btw.

Gniarf · Posted: Wed Jul 17, 2013 6:40 pm Post subject:

Ah crap, most likely there are several buffers, so buffer1+offset D7DC is your xp, buffer2+offset D7DC is something else, buffer3+offset D7DC has something to do with rendering... That's why I was reluctant to do an asm patch in an emulator.

Anyway try to find a pointer to your post battle xp an post it here. Given the code you showed me, its topmost offset will be D7FC or D7DC (probably [ePSXe.exe+42AF40 + IDKWhat*4]+D7DC).
The algorithm of this script will be simple: Take the function that writes stuff in the emulator, and if tries to write over the thing pointed by your pointer, perform xp multiplication.