| http://www.w3.org/ns/prov#value | - A spare pin on the keyboard controller was used to control the gate, either through the BIOS or with software that knew about it (the keyboard controller is a computer in its own right, and it had some spare programming space as well as a spare pin that could be used for stuff that was left out of the 286).Programs such as Windows and OS/2 enter and shut down through the BIOS, so Gate A20 needs to
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