Units are needed to comply with a protocol so that the interrupt-request (IRQ) strains is often shared. The PCI bus contains 4 interrupt strains, INTA# via INTD#, all of which can be found to every unit. Approximately 8 PCI gadgets share the identical IRQ line (INTINA# via INTINH#) in APIC-enabled https://nathanlabsadvisory.com/copyright-certified-information-system-security-professional/