On the Wii, the IOS (Input/Output System) is not the main operating system (the System Menu is). Instead, an IOS is a collection of drivers that control specific hardware functions. Think of them as modules:
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Emulators like (for N64 games) or WiiSX (for PlayStation 1) require specific IOS slots to access USB storage or increase RAM speed. Without the correct IOS WAD installed (such as IOS58), these emulators will run at half-speed or fail to save. On the Wii, the IOS (Input/Output System) is
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