WiiU also had the back compat hardware of the Wii, just couldn't take a gamecube disc in it's drive.
Similarly, a lot of the SNES internally looks like it was at least initially designed for back compat with the NES.
Similarly, a lot of the SNES internally looks like it was at least initially designed for back compat with the NES.
(so, even if you could put a GC disk in, it didn't have capability to natively play the game)
He explains it quite well. Sorry it’s German but I guess the information about the chips and reasons Nintendo choose them should be all over the net.