Equipment are required to stick to a protocol so the interrupt-request (IRQ) traces is usually shared. The PCI bus contains four interrupt traces, INTA# by INTD#, all of which are offered to every machine. As much as eight PCI units share a similar IRQ line (INTINA# through INTINH#) in APIC-enabled https://nathanlabsadvisory.com/swift-csp-assessments/