MIOS is responsible for reading and running [[apploader]]s, but not for configuring the streaming audio (DTK) buffer; the [[System Menu/BS2|System Menu's BS2]] sets that up in state 11. Neither BC nor MIOS reset the disc drive, as doing so would clear the buffer configuration.
Once a GameCube game starts, MIOS does not do much, as direct access to GameCube hardware is now enabled. The main function of MIOS at this point is to handle the front buttons on the Wii; pressing the power button at this point shuts down the GameCube game and launches boot2, which
completes the shutdown.