The Vii is one of the many clones of the Wii, going so far as to include its own version of Wii Sports. However, it's only slightly more advanced than those Plug & Play games. It's notable for being one of the earliest Wii clones and having a cheesy commercial.
A lot of things in this menu don't work properly when emulated in MAME. Try them on a real console and document them here.
Holding 1 + 2 (or A + B, as they are received as the same input) while starting the console without a cartridge inserted boots it to a diagnostic menu. Pressing B + Up (or 1 + Up) will exit the diagnostic menu or the current sub-menu.
KEYBOARD + G-SENSOR
A controller test screen similar to ones found in the 7-in-1 and 10-in-1 cartridges, with added tests for the controller's gyroscopic sensors. The gyroscopic sensors currently do not work properly when emulating the Vii through MAME, and will constantly cycle through random values despite not being activated.
Doesn't work under MAME.
Plays 10 different sounds in order and then exits to the main diagnostic menu. As sound is not properly emulated for the Vii yet, it's currently unknown what sounds are being played.
Displays "Please Wait......" and hangs, likely due to faulty emulation.
Displays "Please Wait......" for a bit, cycles through three background images from the built-in games, and then displays the internal ROM's checksum.