Depending on how critical your application is to those customers some of 
the people at that company might cheer if you'd take a stand and say you 
are upgrading and will no longer support obsolete versions of the OS.  One 
major player did at their user meeting and people stood and clapped.  Now 
they had a "business reason" to upgrade.

But back to your question.  IBM traditionally supports "x-2"  V5R3 could 
compile down to (3 minus 2) or V5R1.

Now, prior to some release the big trick was to compile down to the last 
CISC release - V3R2.  So, if V4R3 wasn't supported you could compile down 
to V3R2 and then run that.  At some release IBM dropped V3R2 as an option.

I tried looking in the Infocenter for old releases.  I've amazed how bad 
infocenter was compared to what we currently have.  Seems that no one ever 
updated the TGTRLS help on the old infocenters.  Still used examples like 
V2R3, which hasn't been supported in a coon's age.

Rob Berendt

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