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785 bytes added ,  10:38, 8 June 2010
add some info on the complexity of the early boot process, please fill in as you are able
The System Menu is software shipped pre-installed into every Wii which allows the launching of games from an officially Nintendo certified game disk, launching of Nintendo Certified channels and Virtual Console and WiiWare titles.
It plays a major role in the startup, shutdown, and transitions between system states; upon starting up, the System Menu's main() reads the following files:
* /title/00000001/00000002/data/setting.txt
* /title/00000001/00000002/data/state.dat
* /shared/sys2/NANDBOOTINFO
* /title/00000001/00000002/data/cache.dat
* ?
Based on the things read by main() (as well as certain flags set in memory?), the menu can take the following actions:
* Hang (unrecoverable brick!)
* Boot a disc title directly from cache.dat
* Shutdown system from GC mode
* Eject a disc, then shut down (if Eject was pressed)
* "Shutdown to idle" (Enable WC24, halt PPC)
* "Launch NAND app from WC24"
* Enter "recovery mode" (aka IRD mode)
* Display the Health / "Warning" screen, and proceed on with normal boot
On an un-modded system, it is the first thing a Wii user will see when s/he turns on his/her Wii having pressed 'A' at the Health and Safety screen. An X denotes that no version is available for the applicable region.

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