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documentation, particularly for programming, you should not rely on the information found here, as it will be woefully out of date.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 megabyte, which can
     be accessed only 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.
 
     This function is not supported on the PS/2 Models 25 and 30.
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