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    The extended BIOS data area is allocated at the high end of conventional
    memory during the POST (Power-On-Self-Test) sequence. The word at
    0040:0013H (memory size) is updated to reflect the reduced amount of
    memory available for MS-DOS and application programs. The first byte in
    the extended BIOS data area is initialized to its length in KB.
 
    A program can determine whether the extended BIOS data area exists with
    Int 15H Function C0H.
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