Backward compatibility on OS level V4R4 to V4R3

10 pts.
Have a question on backward compatability. Currently we moved some historical JD Edwards data that was on an AS/400 running OS400 V4R5 to a machine running V4R4. Now, we want to move this to another AS/400 that is running V4R3. Now, from V4R5 to V4R4 we havd no problems. I'm not sure if we can take it another release back. My questions is what are the differences between the two operating systems (V4R4 and V4R3). Is this possible? Also, what are the differences between the two RPG versions, if any. Might we run into problems there with compiler or code issues. Are there other differences that could be potential road stoppers. Thank you in advance for any help you can give. Brian Muraski

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Wow. If you have this spare machine with the capacity to take this history data, you have nothing to loose by restoring the data and verifying if the software will work. If there are no errors when you restore the data, seeing whether the software will run will not hurt anything. I can say, if you are simply storing the data and the actual JDE software will be processing on another I-series, where OS-400’s level is supported by JDE for the version you are using, it should work if you don’t have issues restoring the data. I would imagine that the need to do this stems from a fee imposed if you upgrade the machine or change to a new machine. Interesting idea, but I would really cost out the possible savings over three years and make sure the cost of maintenance was lower than the upgrade price. Can you tell us how old this machine is? I can’t remember when I last saw Version 4. You may check the IBM web site to see if IBM still has the information about the version change from the older version to the newer version. Even if there were major DB changes between the versions for OS-400, JDE may not have used the newer features right away and therefore JDE may work on the older OS.

Hope this helps,
Good luck.

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  • Unknowingone
    If the source language is RPG/400-not RPGIV, you can recompile with no problems. There were no modifications to the language going from V4R3 forward. If you are porting compiled code though, and not the sources, you will have to check the compiler release used to compile the programs. That can be checked using the DSPPGM command and looking at the "earliest release the program can run" parameter. If you have many programs, the fastest way to check is to save the progams into a savefile at V4R3 and see if they save or not.
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