Gadgets are needed to comply with a protocol so which the interrupt-request (IRQ) lines is usually shared. The PCI bus includes 4 interrupt traces, INTA# by means of INTD#, all of which are offered to each machine. Around 8 PCI devices share the identical IRQ line (INTINA# through INTINH#) in https://nathanlabsadvisory.com/open-source-scanning-oss/