Equipment are necessary to comply with a protocol so that the interrupt-request (IRQ) lines could be shared. The PCI bus contains 4 interrupt strains, INTA# through INTD#, all of which can be obtained to every system. As much as 8 PCI equipment share the exact same IRQ line (INTINA# via https://nathanlabsadvisory.com/forensic-audit-cyber-forensics/