Many computer system designs today implement a common printed circuit board assembly that is used in more than one mechanical chassis. This invention describes a design method that allows software to identify in which chassis the PCA has been installed. The system software is able to determine the chassis type be detecting a set of mounting screw connections that are unique for each particular chassis.
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Bishop, Travis D.; Michna, Vincent W.; Rhodes, Tom; and Depew, Kevin G., "A Method to Allow Software Detection of Multiple Different Chassis Types That Use a Common PCA", Technical Disclosure Commons, (March 06, 2018)