Gadgets are necessary to adhere to a protocol so the interrupt-ask for (IRQ) traces can be shared. The PCI bus involves 4 interrupt lines, INTA# by way of INTD#, all of which are offered to each unit. Around 8 PCI devices share a similar IRQ line (INTINA# by means of https://nathanlabsadvisory.com/data-protection-officer-service-virtual-dpo/