Equipment Are needed to comply with a protocol so the interrupt-ask for (IRQ) strains is usually shared. The PCI bus involves 4 interrupt traces, INTA# via INTD#, all of which can be found to every machine. Up to 8 PCI devices share the same IRQ line (INTINA# by way of https://nathanlabsadvisory.com/achieve-pci-dss-compliance-in-the-usa-secure-your-business-today/