Devices Are necessary to abide by a protocol so which the interrupt-request (IRQ) traces can be shared. The PCI bus includes 4 interrupt lines, INTA# through INTD#, all of which are available to each product. Around eight PCI equipment share the identical IRQ line (INTINA# through INTINH#) in APIC-enabled x86 https://nathanlabsadvisory.com/smart-contract-audit-copyright-companies-1/