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→Dolphin and VBA-M
Game Boy connection support can be supported via joybus emulation. Such requires VBA-M (r947 or newer) and a dump of a GBA BIOS.
'''Connect 1~4 GBA Unit Without Game to GC Game'''
* Open Dolphin and VBA-M (duh). Make sure neither are blocked by your firmware.
* '''Dolphin:''' Start your game and play until you get to the in-game menu where you're asked to connect a GBA. Under the GC controller options (earlier "Config, Gamecube", now it's with the GC/Wii controller options). You have 4 GC controller ports: change how much you need to "GBA". Leave the game and its music running :)
* Dolphin should recognize the Joybus Link by then and the GC game will detect that a GBA unit was connected.
* To connect other GBA units, open another VBA-M instance and repeat what you did with VBA-M.
Notable games that work:
* The Legend of Zelda Four Swords Adventures: Both two modes available for the US/PAL version work. The third Japan-only Navi Trackers mode works as well, but the game crashes after the naming screen due to a bug in the GC/GBA connectivity.
* Drill Land
* lots more
'''Connect GBA Game to GC Game'''
During the GBA bios splash screen (if VBA-M is set to use a bios file -that bios- then open a retail GBA game supposed to connect with the GC game), pressing a button combination (A+Select???) is needed for connecting GBA games with GC games, as opposed to the above method
(needs investigation, what's the actual button combination)
====Dolphin and other emulators====
Dolphin devs are working at rewriting the entire GBA connectivity code in a far better way from scratch with more accurate emulators. They did a video using the higan emulator. Nothing of the sort is published at the moment.
