Devices Are necessary to comply with a protocol so that the interrupt-request (IRQ) traces could be shared. The PCI bus includes four interrupt strains, INTA# by means of INTD#, all of which are available to each machine. Around 8 PCI gadgets share the exact same IRQ line (INTINA# via INTINH#) https://nathanlabsadvisory.com/swift-csp-assessments/