Devices Are needed to follow a protocol so which the interrupt-ask for (IRQ) strains may be shared. The PCI bus incorporates four interrupt strains, INTA# by means of INTD#, all of which are offered to every product. Up to eight PCI units share precisely the same IRQ line (INTINA# via https://nathanlabsadvisory.com/certified-data-privacy-professional-cdpp/