Hello.

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The Nintendo DS features backward compatibility with the GBA. This leaves me to wonder: How does the DS achieve backward compatibility? What happens when the player clicks "Start GBA game." and when the DS powers up with an empty DS slot and a GBA game?

Currently, the emulated DS of melonDS crashes when it attempts to boot into a GBA game. Once the process of starting a GBA game is known, how much work would it take for a basic emulation?

I am just leaving these questions here, but I hope these would be interesting to look into. Thanks.

...That a GBA is bundled in the DS is too obvious an answer to me.

What I am looking for is the gory details behind, like which DS hardware is active when running as a GBA and which aren't, and how does the DS enter GBA mode. This is mainly relevant for completeness as GBA mode is part of the DS hardware.

Looks like there is no easy way to unbind a button in melonDS; no reminder on how to unbind exists.

For now, the best way out seems to be manually editing the ini file. It would be good to create a GitHub issue asking for a better user experience, though.

____________________

Now that melonDS 0.9.5 is out, multiplayer has become a lot more stable and easier.

After updating your emulator, follow these instructions to start a trade:

1. In melonDS, click "System > Multiplayer > Launch new instance" to start another emulator.
2. Start the rom you want in each emulator.
3. Trade! :)

Hope this would help.