Equipment are required to stick to a protocol so the interrupt-request (IRQ) lines could be shared. The PCI bus features 4 interrupt strains, INTA# by means of INTD#, all of which can be found to every unit. As many as 8 PCI equipment share exactly the same IRQ line (INTINA# https://nathanlabsadvisory.com/ensure-data-privacy-and-security-with-hipaa-compliance-services-in-the-usa/