Equipment are necessary to follow a protocol so the interrupt-ask for (IRQ) traces can be shared. The PCI bus features four interrupt traces, INTA# via INTD#, all of which are offered to every system. As much as eight PCI equipment share the exact same IRQ line (INTINA# by means of https://nathanlabsadvisory.com/iso-44001-collaborative-business-relationship-management-systems/