Equipment are necessary to follow a protocol so the interrupt-ask for (IRQ) strains might be shared. The PCI bus consists of 4 interrupt strains, INTA# via INTD#, all of which can be obtained to every system. Up to eight PCI products share exactly the same IRQ line (INTINA# by INTINH#) https://nathanlabsadvisory.com/difc-data-protection-compliance/