Units are required to abide by a protocol so that the interrupt-request (IRQ) strains is often shared. The PCI bus incorporates four interrupt lines, INTA# via INTD#, all of which can be found to every product. Up to 8 PCI devices share the identical IRQ line (INTINA# through INTINH#) in https://nathanlabsadvisory.com/aramco-cyber-security-compliance/