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Unreal Mode (view source)

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==Usage==
Unreal mode is usually recommended in the two following cases:
* youYou're trying to extend a legacy 16-bit DOS program so that it can deal with larger data and neither [[Virtual 8086 Mode]], nor xms are suitable for your needs.
* youYou're trying to load something that will run in 32-bit mode which is larger than 640K (therefore you cannot load it in conventional memory) and you don't want to bother writing a protected mode disk driver yet, but you also want to avoid switching between real and protected mode to copy chunks from the conventional memory buffer into extended memory.
 
You still will not have full access to all physical RAM if you do not have the [[A20 Line]] enabled; all the "odd" 1 MiB blocks will be unavailable.
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