Units are required to observe a protocol so the interrupt-ask for (IRQ) lines is usually shared. The PCI bus incorporates 4 interrupt strains, INTA# by INTD#, all of which are available to each gadget. Approximately 8 PCI equipment share the exact same IRQ line (INTINA# by INTINH#) in APIC-enabled x86 https://nathanlabsadvisory.com/copyright-certified-information-system-security-professional/