Cheat Engine

[stampy]

I'm trying to create a breakpoint when a register is changed to a certain value so that I can see what instruction changes it. Doing a trace freezes the game so I cannot cause the instruction to occur while a trace is running (although I may not be doing the trace correctly).

Background:
The game I'm modifying is pokemon leaf green on the vba emulator (using it to learn more about memory structures etc). I'm looking for the amount of money a player has in the game, but I believe it is encrypted somehow. There is a time however, where the value is stored in a 2 byte value, which is when a certain menu is brought up, although this is only for display. I found out what writes to this address, but from here I'm stuck, as the code looks like this:

[Dark Byte]

After setting a breakpoint (any breakpoint, including find what writes and break/trace) you can set a break condition. usually by rightclicking the instruction, else in view->breakpoint list and rightclick it there

In there fill in a lua syntax condition that will determine if it should break or not.
e.g: (EBX+EAX+0)==0xaddress


Anyhow, before you continue I recommend giving up if this is meant to learn how to reverse a game.
The reason for that is that you aren't debugging the game, but the emulator. It's like debugging the windows kernel when you're trying to find what writes health the first step of the cheat engine tutorial

[stampy]

Thanks for the advice and quick reply!

I'm not sure if I understand you correctly, but I'm trying to put a break at an unknown instruction. Basically a global break condition. I'm reading your reply as placing the break condition in the instructions that write to the display value, not read the true value.

I might move on to something a bit simpler regardless.