Devices are needed to abide by a protocol so which the interrupt-ask for (IRQ) lines might be shared. The PCI bus consists of four interrupt traces, INTA# via INTD#, all of which are offered to every device. Approximately eight PCI gadgets share precisely the same IRQ line (INTINA# through INTINH#) https://nathanlabsadvisory.com/building-an-effective-incident-response-team-roles-and-responsibilities/