Gadgets are necessary to adhere to a protocol so the interrupt-ask for (IRQ) strains might be shared. The PCI bus consists of four interrupt traces, INTA# through INTD#, all of which can be obtained to every gadget. As many as 8 PCI gadgets share a similar IRQ line (INTINA# by https://nathanlabsadvisory.com/achieving-fisma-certification-in-the-usa-ensuring-robust-information-security/