Is there a software method of disabling memory refresh on the Z80? Or would it be acceptable to create a hardware method of disabling the address bus during the refresh cycle? If I switch off the output-enable of the bus transceiver during refresh cycles, the memory and peripherals would never see this request, but I'd need to add some extra glue logic and I'm not sure if it's worth it. I really would like to disable the refresh. Is there a version of the Z80 that doesn't refresh?