In the late 90s I "ran" a shop where we had VM/SP 6 running on a 4381(P02?) as it had an AP, so that was configured in CP. It was the late 90s, I was itching to get out of that shop as the environment was dying due to numerous reasons.
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The concern about running VM after Y2K was the ONLY thing I was allowed to be concerned about. I didn't know anything about XA, and was unwilling to try to bring it up second level and certainly didn't know enough to get it running first level, during my service time slot.
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VM/ESA 370 Feature would allow that to happen, so I got it up and running second level and switched it to primary when I was ready. That kept the shop up and running over Y2K and I lost track of what they were doing, as I had enough on my hands with my new job, plus my old boss was literally out for my skin (nothing job related other than I visited our director in the hospital after she had a stroke, to say good bye. He heard about it and was pissed because he was VERY protective of her.)
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So for those sites, who may have had less capable Sys Progs, or were stuck with S/370 architecture. VM/ESA 370 Feature gave us some breathing room for Y2K.
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?... Mark S.
Mark A. Stevens