A20 Line or 8042 Gate Memory Errors

A20 Line or 8042 Gate Memory Errors

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Explanation: The system is detecting a failure trying to access the 21st address line, A20. This line is used to provide access to the high memory area, and is normally controlled through the keyboard controller.

Diagnosis: This is usually a problem with either the keyboard or the keyboard controller on the motherboard.


  • Troubleshoot the keyboard.
  • Troubleshoot the keyboard controller.
  • Troubleshoot the motherboard.

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