Gadgets are necessary to abide by a protocol so which the interrupt-ask for (IRQ) traces may be shared. The PCI bus features four interrupt traces, INTA# as a result of INTD#, all of which are offered to each gadget. Up to 8 PCI products share a similar IRQ line (INTINA# https://nathanlabsadvisory.com/certified-data-privacy-professional-cdpp/