> z/OS can run 24, 31 and 64 bit code alongside and call each other Indeed... upwards compatibility is always valuable. I quite often get requests to add enhancements to tools that I wrote pre-REX (i.e, late 1970s). These are still running and in daily use. (I just send the requesters the source code .. they usually have no idea that the code is more than 40 years old but still runs 'just fine').
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