Abstract: An industrial computer including a passive backplane generally compliant with the PCI/ISA industrial standard promulgated by the PICMG technical committee, but with certain exceptions. One exception being that the plug-in CPU card has been replaced by a plug-in "feature" card which includes features normally found on prior art CPU cards but not the microprocessor. Also the in-line ISA and PCI backplane connectors used for conventional CPU cards have been replaced by preferably two in-line SECC connectors for the feature card. In the preferred embodiment a third SECC connector is used to connect a PENTIUM II to the backplane, and a further connector is used to connect the PENTIUM II's voltage regulator module to the backplane. All communications between the processor, feature card, voltage regulator module, and backplane I/O buses are via signal lines in or on the backplane. This invention allows the entire CPU and associated features to be quickly swappable in case of malfunction.