[ The PC Guide | Troubleshooting and Repair Guide | The Troubleshooting Expert | Troubleshooting The System Overall | Troubleshooting BIOS Beep Codes | Phoenix BIOS ] Keyboard, keyboard controller or gate A20 errors Explanation: The keyboard controller is a chip on the motherboard that communicates with your keyboard. It also controls the A20 gate that provides access to the high memory area (HMA). There is a failure somewhere in this part of the system. Diagnosis: An error of this sort is usually a problem with either the keyboard or the motherboard, possibly specific to the keyboard controller. Recommendation:
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