Important Notice

The pages on this site contain documentation for very old MS-DOS software, purely for historical purposes. If you're looking for up-to-date documentation, particularly for programming, you should not rely on the information found here, as it will be woefully out of date.

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    Extended memory is memory at addresses above 1 MB, which can only be
    accessed by an 80286 or 80386 CPU running in protected mode. Because
    MS-DOS is a real-mode operating system, extended memory can be used for
    storage of volatile data but cannot be used for execution of programs.
 
    Programs and drivers that use this function cannot be executed in the
    Compatibility Environment of OS/2.
 
    This function is not supported on the PS/2 Models 25 and 30.
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