Equipment are needed to comply with a protocol so that the interrupt-request (IRQ) traces might be shared. The PCI bus incorporates 4 interrupt traces, INTA# by INTD#, all of which can be obtained to each gadget. Around eight PCI equipment share the identical IRQ line (INTINA# by means of INTINH#) https://nathanlabsadvisory.com/ce-marking-services-european-notified-body/