Products are required to observe a protocol so that the interrupt-request (IRQ) strains might be shared. The PCI bus incorporates four interrupt lines, INTA# as a result of INTD#, all of which are available to every device. Up to 8 PCI units share precisely the same IRQ line (INTINA# by https://nathanlabsadvisory.com/copyright-certified-information-system-security-professional/