You could be asking two things, both quite different to the other.
1) On older consoles there was a class of device called the game genie. Unlike the action replay/codebreaker/goldfinger/gameshark/pelican/... the game genie edited the ROM the console saw and had minimal RAM editing abilities (all the others mentioned being primarily RAM editing devices). By the GBA this was not really a thing any more, though some cheat devices have the ability to do one or two very very small edits to the ROM. This is usually done to bypass any protections the ROM might have or to allow cheats to work with some non standard ROMs and are usually under the umbrella of master codes.
https://doc.kodewerx.org/hacking_gba.html covers what those codes look like.
You can use the info there to hardpatch the codes into the game such that you can run them on a flash cart or emulator without cheat support, or not having to worry about configuring it every time. That said you can do that with any cheat with tools like GBAATM ( https://gbatemp.net/threads/gbaatm-rebirth-gba-auto-trainer-maker-a-new-hope.564321/ is a more recent fork).
2) You have some kind of ROM hack and it has both a normal ROM edit component and also wants you to have some cheats. For instance I might make a level consisting of several boss characters one after the other and say use this cheat for infinite ammo so I don't have to do ammo drops in my level edit or worry about the player needing to conserve ammo.
In that case then you have the ROM patch, patch the ROM with it using whatever tools are necessary (some emulators might even do it for you), load the cheats via whatever means (emulator, flashcart, GBAATM...) and play as you will.
1) On older consoles there was a class of device called the game genie. Unlike the action replay/codebreaker/goldfinger/gameshark/pelican/... the game genie edited the ROM the console saw and had minimal RAM editing abilities (all the others mentioned being primarily RAM editing devices). By the GBA this was not really a thing any more, though some cheat devices have the ability to do one or two very very small edits to the ROM. This is usually done to bypass any protections the ROM might have or to allow cheats to work with some non standard ROMs and are usually under the umbrella of master codes.
https://doc.kodewerx.org/hacking_gba.html covers what those codes look like.
You can use the info there to hardpatch the codes into the game such that you can run them on a flash cart or emulator without cheat support, or not having to worry about configuring it every time. That said you can do that with any cheat with tools like GBAATM ( https://gbatemp.net/threads/gbaatm-rebirth-gba-auto-trainer-maker-a-new-hope.564321/ is a more recent fork).
2) You have some kind of ROM hack and it has both a normal ROM edit component and also wants you to have some cheats. For instance I might make a level consisting of several boss characters one after the other and say use this cheat for infinite ammo so I don't have to do ammo drops in my level edit or worry about the player needing to conserve ammo.
In that case then you have the ROM patch, patch the ROM with it using whatever tools are necessary (some emulators might even do it for you), load the cheats via whatever means (emulator, flashcart, GBAATM...) and play as you will.
Thanks for the quick reply it was very usefull and interesting to read!
I guess I've forgott to say that I've a ez-flash omega I thought I would be able to modify rom while using the cheat module.
For example I would need to patch something like (see image below).
If I Patch by myself and put the patched rom on ez-flash it works well but I would preffer to do that temporary by cheat module but it sounds like that this isn't possible... Am I right?
best regards
I guess I've forgott to say that I've a ez-flash omega I thought I would be able to modify rom while using the cheat module.
For example I would need to patch something like (see image below).
If I Patch by myself and put the patched rom on ez-flash it works well but I would preffer to do that temporary by cheat module but it sounds like that this isn't possible... Am I right?
best regards
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I don't know what the limits of the EZFlash cheat engine are for this sort of thing. Theoretically it could be effectively infinite but likely is far less than that, whether it is just the one code and whether you could switch it out* like most cheat carts I also don't know.
*could be easy enough to do a if button press but rather than say filling a life bar back up or adding 1000 experience as per most activator cheats you could write the original (or further modified) code in its place.
I would also ask what does it do and do you have a better alternative that you can do with RAM cheats? Would be less than ideal but could probably do it with a ROM hack as well that you turn off and on at will (set a small flag, copy whatever amount of data to another area of the ROM, patch the area you want patched and then have any reads to that area check the flag to see whether they should go to the original location or the duplicate in blank space.
*could be easy enough to do a if button press but rather than say filling a life bar back up or adding 1000 experience as per most activator cheats you could write the original (or further modified) code in its place.
I would also ask what does it do and do you have a better alternative that you can do with RAM cheats? Would be less than ideal but could probably do it with a ROM hack as well that you turn off and on at will (set a small flag, copy whatever amount of data to another area of the ROM, patch the area you want patched and then have any reads to that area check the flag to see whether they should go to the original location or the duplicate in blank space.
If the EZ can use rom patch cheats, then they might be able to disable the concatenating of cheats in the files, and we could just use full addresses. Though the next question is if it can also include Slide codes, comparators, etc. Those would be nice to have.
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