[Gameboy] How to know when a level changed?

[eyeliner]

Hello, friendly mammals!

I am hacking away my favorite GB game, Batman the Murderer Videogame.
My main motivator is adding SGB borders, which I have done successfully and tested on real hardware.

My question is if anyone knows the specifics of how or if, for that matter, the level transitions have some identifiable method or trigger. Or, at least, how to look for such a thing.

My motivation, now, is trying to trigger a new border on level transition.

Thanks.

 

[cearp]

No idea about this game, but I guess the "level" that you're referring to, is the "STAGE X-X" displayed in the top left?
If so, I'd find which memory address that that value is stored at.
Not sure if you need advice on how to find that.
Could find location by using bgb to see which tile is being drawn for the value, then working backwards and seeing how that tile is chosen.
Or just search memory, assuming first level is 1, go to the next level and search for 2... etc.

Once you have found that, then you'd incorporate checking the value at that memory address when you're setting up the data for your SGB border.
I'm not sure if borders can be dynamic, or how they work at all to be honest!

I might have made it sound a bit too simple

 

[eyeliner]

No idea about this game, but I guess the "level" that you're referring to, is the "STAGE X-X" displayed in the top left?
If so, I'd find which memory address that that value is stored at.
Not sure if you need advice on how to find that.
Could find location by using bgb to see which tile is being drawn for the value, then working backwards and seeing how that tile is chosen.
Or just search memory, assuming first level is 1, go to the next level and search for 2... etc.

Once you have found that, then you'd incorporate checking the value at that memory address when you're setting up the data for your SGB border.
I'm not sure if borders can be dynamic, or how they work at all to be honest!

I might have made it sound a bit too simple

You got the gist of it, yes. It really is that string. I have tried to look for numbers increasing when exiting a level and starting the next, but got nowhere. Didn't cross my mind checking for the tile access. Good catch!

Just from memory, there's a couple of games that I've seen doing a border change, but their name eludes me. They are definitely marked as "SGB Enhanced" on the No-Intro romset.

 

[4d1xlaan]

Pokemon tcg on gameboy color does border change between main menu and in-game, and based on the medals you earn in-game