The Question is:
Where can I find out what's the oldest layered product version that will run
under OpenVMS 7.2-1? I have found what the newest (supported) versions will
run, but not the oldest.
The Answer is :
Information on the oldest product version that will function with a
particular OpenVMS release is not tracked nor reported. While this
information might well be interesting and useful, the associated
product testing involved is only performed with the supported (recent
or current) product versions; the additional tracking and testing
involved would increase the costs and effort involved -- an increase
for releases that are considered unsupported.
In the case of OpenVMS Alpha user-mode code, upward-compatibility
would tend to indicate that code (code with no latent bugs, that is)
should continue to operate. OpenVMS Alpha kernel-mode code may (or
may not) require surgery or upgrade or otherwise during an upgrade.