One of the main things I really remember about the DMK-->HCP transition was that IBM abandoned the whole notion of source code maintenance. HCP started to have OCO modules!!! Up until that point, even lots of the code was poorly written by today's standards, at least we had the source code and we could do stuff with it. Source code based VM in all its forms was always a collaborative journey with IBM and its customers.
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Lots of the VM functional evolution happened because of customer driven change. The EDGAR Editor grew out of the PE Editor and all gave rise to XEDIT. PROFS was originally developed by Amaco, BNR, and others and picked up by IBM as one of the most successful mainframe productivity tools ever. Little things like TERM MORE and HOLD are direct copies of customer mods. The list goes on
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For a glimpse back at how part of this, I would encourage y'all to find a copy of the LSRAD Report. The hardcopy is out there someplace. There was also an accompanying 35mm slide deck that went with the public pitch... don't know if that still exists. (My shop, Home Savings of America, was one of the five featured customers in that presentation.)
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cheers,
William
