Gadgets are needed to adhere to a protocol so the interrupt-request (IRQ) traces could be shared. The PCI bus contains four interrupt traces, INTA# via INTD#, all of which are offered to each product. As much as eight PCI equipment share the exact same IRQ line (INTINA# via INTINH#) in https://nathanlabsadvisory.com/cybersecurity-fintechs/