Equipment are required to comply with a protocol so the interrupt-ask for (IRQ) lines is usually shared. The PCI bus contains four interrupt strains, INTA# via INTD#, all of which can be obtained to every device. Approximately 8 PCI equipment share a similar IRQ line (INTINA# by means of INTINH#) https://nathanlabsadvisory.com/mobile-app-development/