Gadgets are needed to follow a protocol so the interrupt-ask for (IRQ) traces may be shared. The PCI bus includes 4 interrupt lines, INTA# via INTD#, all of which are available to each machine. Approximately 8 PCI units share the identical IRQ line (INTINA# through INTINH#) in APIC-enabled x86 devices. https://nathanlabsadvisory.com/total-block-chain-solutions/