Units Are required to follow a protocol so which the interrupt-request (IRQ) strains might be shared. The PCI bus contains 4 interrupt lines, INTA# by INTD#, all of which can be obtained to each system. Approximately 8 PCI products share a similar IRQ line (INTINA# by means of INTINH#) in https://nathanlabsadvisory.com/navigating-cybersecurity-and-risk-management/