Devices are necessary to adhere to a protocol so which the interrupt-request (IRQ) traces is often shared. The PCI bus includes 4 interrupt strains, INTA# by INTD#, all of which are offered to every gadget. Approximately 8 PCI units share the same IRQ line (INTINA# as a result of INTINH#) https://nathanlabsadvisory.com/supply-chain-security/