Gadgets are necessary to adhere to a protocol so that the interrupt-ask for (IRQ) lines could be shared. The PCI bus consists of 4 interrupt strains, INTA# via INTD#, all of which can be found to every gadget. Nearly eight PCI units share exactly the same IRQ line (INTINA# by https://nathanlabsadvisory.com/smart-contract-audit-copyright-companies-1/