Assembly Language Help (alang.hlp) (Table of Contents; Topic list)
Int 15h Function C1h
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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 kilobytes.
 
     A program can determine whether the extended BIOS data area exists
     with Int 15h Function C0h.
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