[CRT]

Gametronik (DMG) m'a donné la réponse, c'est No$GBA qu'il faut utiliser


et il faut faire ca :

How to use multiplayer
put the GBA BIOS file in the emulator's folder, and rename it to "gba.rom"
run No$GBA.exe
pick a GBA image (no ZIP)
go to "Options" / "Emulation setup"
increase the number of "Emulated Gameboys"
in "Link Gamepaks", set "Gamepaks in all GBA"
in "Reset/Startup Entrypoint", set "GBA BIOS (Nintendo logo")
click OK, you should then see 2 GBA screens side by side
right click on the left window, click on "Link" so that the window comes back to normal.
then redo the right-click and click "Link" , and here we go, the 2nd gameboy does boot!
Please remember that the more gameboy's you emulate the stonger the pc will have to be!