Gadgets are needed to observe a protocol so that the interrupt-request (IRQ) strains can be shared. The PCI bus incorporates 4 interrupt traces, INTA# by INTD#, all of which can be found to every machine. Around 8 PCI devices share the exact same IRQ line (INTINA# by means of INTINH#) https://nathanlabsadvisory.com/iso-27701-privacy-information-management-system-pims/