If you have an older IBM system like an F50 you do not need to use an emulator. An F50 can load the OS 5.3. (You might look on IBM.com to see if the net server will handle5.3) If this is not an option it looks like Google has a few options that pop on the search "AIX emulator" however I can not vouch for any of them. I hope this helps this is my first post. -KJ