Products are required to adhere to a protocol so the interrupt-ask for (IRQ) lines is often shared. The PCI bus consists of four interrupt lines, INTA# by way of INTD#, all of which are offered to every unit. Nearly 8 PCI equipment share precisely the same IRQ line (INTINA# as https://nathanlabsadvisory.com/cisa-certified-information-system-auditor/