Devices are necessary to comply with a protocol so that the interrupt-ask for (IRQ) traces could be shared. The PCI bus contains 4 interrupt strains, INTA# by means of INTD#, all of which are available to every gadget. As much as eight PCI units share the identical IRQ line (INTINA# https://nathanlabsadvisory.com/navigating-cybersecurity-and-risk-management/