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Old 07-11-2008, 06:31 PM   #3
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Join Date: Aug 2000
Posts: 658

Yes, it is possible to switch NES music drivers in a game. No, it's not easy of course. It's already been done by bbitmaster, you can read up about it at

It's a bit easier to switch the music driver in some games that are programmed from the same company, for example a lot of Capcom games. Change all of the addresses to what the old music driver was using. Change the call to the play code in the NMI interrupt. Change the init entry point so that it's compatible with the tune switch. Doing this will save you a lot of work so that you don't have to go through the entire game changing the tune address and numbers for the tune index. There are exceptions to this explanation, of course. Good luck.
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