Foxconn 915P7MC-S - Manual (Page 34)

Chapter 3 BIOS Description
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Memory
This is a Display-Only Category, determined by POST (Power On Self Test) of
the BIOS.
Base Memory The BIOS POST will determine the amount of base (or
conventional) memory installed in the system.
Extended Memory The BIOS determines how much extended memory is
present during the POST.
Total Memory Total memory of the system.