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Chapter 9 Enabling A20

Posted: Mon Oct 03, 2016 1:44 pm
by IvanKush
Maybe add the following information
Intel no longer supports the A20 gate starting with Haswell. Page 271 of the Intel System Programmers Manual Vol. 3A from June 2013 states: "The functionality of A20M# is used primarily by older operating systems and not used by modern operating systems. On newer Intel 64 processors, A20M# may be absent."[3]