This is the special form of go through cycle implicitly tackled for the interrupt controller, which returns an interrupt vector. The 32-bit address area is ignored. 1 achievable implementation is always to make an interrupt accept cycle on an ISA bus using a PCI/ISA bus bridge. in the case of https://nathanlabsadvisory.com/achieve-hitrust-compliance-in-the-usa-to-protect-sensitive-health-information/