Equipment Are needed to stick to a protocol so that the interrupt-ask for (IRQ) strains can be shared. The PCI bus involves 4 interrupt lines, INTA# by means of INTD#, all of which can be found to every system. Around eight PCI devices share the same IRQ line (INTINA# by https://nathanlabsadvisory.com/ensuring-secure-payment-processing-with-pci-dss-compliance-certification-in-the-usa/