Abstract: A structure for interconnecting a plurality of modules into a data processing system, which structure includes a plurality of module receiving receptacles, several process active, individual first electrical conductors intersecting the receptacles wherein the conductors are positionally located in sequence, i.e. 1, 2, 3 . . . n, and including means on a selected type of module for interconnecting these several conductors in comformity with the position sequence, whereby the conductors may be interconnected in the data processing system through the receptacle in the positional sequence. Consequently, insertion of a preselected module into a given module receptacle controls the continuity of the bus network to an adjacent receptacle.