Products are necessary to follow a protocol so that the interrupt-request (IRQ) strains is usually shared. The PCI bus consists of 4 interrupt lines, INTA# through INTD#, all of which are offered to each unit. Around 8 PCI products share exactly the same IRQ line (INTINA# through INTINH#) in APIC-enabled https://nathanlabsadvisory.com/the-top-benefits-of-using-ciso-as-a-service/