Gadgets are required to comply with a protocol so the interrupt-request (IRQ) strains is often shared. The PCI bus includes 4 interrupt strains, INTA# by INTD#, all of which are offered to every gadget. Around 8 PCI units share exactly the same IRQ line (INTINA# by way of INTINH#) in https://nathanlabsadvisory.com/ce-marking-services-european-notified-body/