Units are required to stick to a protocol so the interrupt-ask for (IRQ) strains is usually shared. The PCI bus incorporates 4 interrupt traces, INTA# via INTD#, all of which are offered to every machine. Approximately eight PCI gadgets share exactly the same IRQ line (INTINA# by INTINH#) in APIC-enabled https://nathanlabsadvisory.com/testing-for-compliance/