A20 Line: Difference between revisions

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→‎Testing the A20 line: Substitute the 386-specific FS/GS with DS/ES.
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===Fast A20 Gate===
===Fast A20 Gate===
On several newer computers, the chipset has a FAST A20 option that can quickly enable the A20 line. To enable A20 this way, there is no need for delay loops or polling, just 3 simple instructions.
On most newer computers starting with the IBM PS/2, the chipset has a FAST A20 option that can quickly enable the A20 line. To enable A20 this way, there is no need for delay loops or polling, just 3 simple instructions.


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