Make your own rumble game for EZ-FLASH OMEGA Definitive Edition

sofa！

 

That's so neat!!

 

Nice!

 

Have you documented the protocol?

 

Nice!
Now we neee Smashing Drive and Payback and we are fine.

Great News

 

Can I be the first to get you to tear your hair out and ask for pokemon?
I think I am funny if nothing else.

Seriously though nice to see. Do we have a list of GBA games that used it?
https://web.archive.org/web/20181012084701/http://problemkaputt.de/gbatek.htm#gbacartrumble mentions drill dozer and warioware but I am not sure what else there was. Hopefully we can also get it for the GBC emulators for those few games.

As far as protocol goes is it likely to be a run at high/med/low power for X seconds/frames type of deal or are we going to have to also hack in a command to disable it later (or a counter on vblank I guess)?

 

Will it rumble the controller on Gameboy Player?

 

I might see about rewriting that as a more general approach (others reading the guide details starting with a cheat location, tracing RAM writes, hooking an instruction responsible for that, means of calculating jumping to a new location depending upon ARM or THUMB where the provided code sample given in the document is to be placed).

In this case the example is to make any change for Mario (rom 0025, http://www.advanscene.com/html/Releases/dbreleases.php?id=0025 ) to the total score will fire the rumble command. Nice guide if you are new to it all. If you already know how to find a suitable target, hook a program, jump (or branch if we are to use GBA parlance) to a new section to run some nice extras and then jump back then the new section to run nice extras is not explained (though if it is all there in that snippet you can probably figure out what it does to fire rumble and stop it again, or just use it yourself).


For those following the guide then
"5、 Find a suitable empty address in the ROM, here is 3E7900，copy the data in patch.bin to here."
This is usually quite easy in GBA games (Mother 3 is probably the only exception you are likely to meet in normal commercial games, though some hacks might also trouble things). Anyway at the end of the ROM is usually a bunch of blank space that gets trimmed off (you know it is blank because it is either 00 or FF where a normal game will be something else*).
Or you can add them; unlike many older systems then any GBA game can be made to 32 megabytes/256Mbit just by padding it out yourself with 00 or FF values to get there, or to one of the lesser sizes if you would rather not fill up your SD card needlessly. No annoyances like you might have for if trying that for NES mappers, GB/GBC memory bank controllers or SNES hirom-lorom and special chips.

*technically the game could use the 00 or FF values as game data, indeed trimming one of the Teenage Mutant Ninja Turtles games appears to break them because of this. The list of troubled games here is pretty much just TMNT and Riviera I think it was.

 

Doesn't this mean technically you could add rumble onto games that never originally had rumble too?

Also do the patches work similarly to the GBC? Would the patched goomba emulator included also facilitate that?

 

You can, indeed several have (the example tutorial for Mario and example patch for Final Fight One both being games that never had it) and seems some more in Chinese forums we get to go fish out.

GB/GBC wise I am not sure what Goomba, or the modified version here, uses to detect whether the game has rumble; technically you can use the header ( https://bgb.bircd.org/pandocs.htm#thecartridgeheader ) but if it is hardcoded for those games already with it then that is a different matter.

If you really wanted I guess you could edit (hack or source code, dealer's choice) the GBA aspect of the Goomba code (or any other emulator) to do something as well -- somewhere in there will be the internal emulated GB/GBC memory (or other system) so find some variable in the memory space for that and do a similar monitor and fire off the GBA rumble command when it detects a change/variable range it likes. Or double up on hacks and have the GB/GBC games send up a flag to their internal memory that the GBA code always watches for and have that trip the rumble (will need a GB/GBC hack rather than a cheat session but spares you having to do a check to see what game is running on goomba (or other emulator) thing lest you load another game and get false positives or have to do a list of games and locations to watch within the already pretty packed goomba code.

 

Thanks to this cart, I have added rumble support to Butano Fighter.

Rumble is great for shoot 'em ups!