Gadgets are needed to stick to a protocol so the interrupt-ask for (IRQ) traces can be shared. The PCI bus includes 4 interrupt strains, INTA# by means of INTD#, all of which can be obtained to every unit. Approximately 8 PCI equipment share the identical IRQ line (INTINA# through INTINH#) https://nathanlabsadvisory.com/pci-dss/