Equipment are required to stick to a protocol so which the interrupt-request (IRQ) traces might be shared. The PCI bus involves 4 interrupt strains, INTA# via INTD#, all of which are offered to each device. Approximately eight PCI units share the exact same IRQ line (INTINA# by INTINH#) in APIC-enabled https://nathanlabsadvisory.com/pci-dss/