Devices are necessary to observe a protocol so the interrupt-request (IRQ) strains might be shared. The PCI bus contains 4 interrupt strains, INTA# by INTD#, all of which can be obtained to every product. As much as 8 PCI devices share a similar IRQ line (INTINA# as a result of https://nathanlabsadvisory.com/beta-testing-software-applocation/