Gadgets are needed to adhere to a protocol so which the interrupt-ask for (IRQ) traces could be shared. The PCI bus features 4 interrupt lines, INTA# by way of INTD#, all of which are available to each machine. Around 8 PCI gadgets share a similar IRQ line (INTINA# by means https://nathanlabsadvisory.com/iot-testing-in-the-usa-protect-your-devices-from-cyber-threats/