1. For use in a data processing system wherein a plurality of devices are intercoupled by way of an interrupt signal conveying transmission link to provide interrupt signals to each other, each device having an apparatus associated therewith for intercoupling said interrupt signals among said devices, said apparatus comprising: first means for storing interrupt signals conveyed thereto over said transmission link from said plurality of devices, and second means responsive to an address signal from a device representative of said associated device for causing an interrupt signal stored by said first means to be coupled to said transmission link.