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  • curprev 09:1109:11, 13 May 2025 100.34.18.149 talk 49,349 bytes +254 Entering and exiting protected mode: Refined and clarified the paragraph about entering protected mode, particularly clarifying the role and effect of the A20 gate. (Editors should note that disabling A20 does not disable access to all memory above the first megabyte; it only disables access to odd megabytes, i.e. addresses [100000h,1FFFFFh], [300000h,3FFFFFh], [500000h,5FFFFFh], etc.) undo
  • curprev 08:5708:57, 13 May 2025 100.34.18.149 talk 49,095 bytes −98 Entering and exiting protected mode: Deleted a false detail. The ability to reset the 80286 through a triple fault is in fact entirely dependent on IBM AT hardware. The 80286 CPU goes into the shutdown state when it triple-faults; the IBM-designed AT logic resets the CPU when it signals shutdown. Without the AT shutdown-reset logic, the 80286 would stay in shutdown until reset by some user action (like a machine power cycle). undo

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