It works in significantly different manner, there is no JIT, but TIMI gets AOT compiled into native(-ish) code (that is in turn cached in persistent storage) tr

It works in significantly different manner, there is no JIT, but TIMI gets AOT compiled into native(-ish) code (that is in turn cached in persistent storage) transparently by OS/400 when first run. But the process is hidden and fast enough to look like some kind of JIT VM.