Had some fun reading about the Nintendo GameCube & Wii architecture: https://www.copetti.org/writings/consoles/wii/
Beyond the new remotes & increased networking use (and ofcourse the casing!) those consoles weren't that different...
The GameCube did address I/O bandwidth issues Nintendo was having on previous machines by adding some circuitry inside the GPU to schedule I/O access. The Wii upgraded this to an ARM CPU running a microkernel, capable of emulating the old GameCube behaviour.
Btw the wiimotes included a Broadcom processor to perform triangulation, audio playback, & BlueTooth connectivity.
Oh, and the "home menu"? Nintendo mandated every game permitted past its DRM included that code... It was part of the game, not the OS.
