I know that there was a different 3.1 os for the a4000t computer than for the other Amiga models. My question has to do with when you upgrade to os3.5 and os3.9, there is not a special version for the a4000t. Does the upgrade program recognize the different computer and load some different files or are they all the same for all Amiga models? If this was the case would it make it ok to start with the standard 3.1 os system on the a4000t (rather than the a4000t specific) and the upgrade makes the a4000t changes or are there files from the a4000t 3.1 os that always stay the same through the upgrades? Dan