Products are necessary to stick to a protocol so which the interrupt-ask for (IRQ) lines is usually shared. The PCI bus consists of 4 interrupt lines, INTA# through INTD#, all of which are offered to each gadget. Up to 8 PCI gadgets share precisely the same IRQ line (INTINA# by https://nathanlabsadvisory.com/navigating-the-2025-cybersecurity-threat-landscape/