Importance

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Abstract

In a data processing system of a type including a basic input/output system (BIOS) circuit for carrying out prescribed functions including a power-on self-test (POST) which not only enables the system memory but checks the system configuration based on device register values, the device register values are stored in a non-volatile memory. A novel POST routine responds not only to change of system configuration determined by comparing device register values with values previously stored in the non-volatile memory, but also any change of state of a cabinet switch indicating that a cover of the cabinet housing the PC has been opened. If there has been a change of system configuration and the cover has not been opened since the last boot, the POST routine signals a device error. However, if the cover has been opened, the change of configuration is presumed intentional, i.e., the user has added or removed one or more devices, and the POST routine revises device register values stored in the non-volatile memory accordingly.

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First Claim