Products are necessary to stick to a protocol so which the interrupt-request (IRQ) lines may be shared. The PCI bus consists of 4 interrupt lines, INTA# via INTD#, all of which are offered to each gadget. Nearly eight PCI equipment share the identical IRQ line (INTINA# by way of INTINH#) https://nathanlabsadvisory.com/financial-cyber-security-consulting/