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documentation, particularly for programming, you should not rely on the information found here, as it will be woefully out of date.

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    On some early PC models, the amount of memory returned by this function
    is controlled by the settings of the dip switches on the system board and
    may not reflect all the memory that is physically present.
 
    On the PC/AT, the value returned is the amount of functional memory found
    during the power-on self-test, regardless of the memory size
    configuration information stored in CMOS RAM.
 
    The value returned does not reflect any extended memory (above the 1 MB
    boundary) that may be installed on 80286 or 80386 machines such as the
    PC/AT or PS/2 (Models 50 and above).
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