Re: VM/ESA 370 (was Re: VM/370 new thrilling experience)
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On 11/11/2024 08:41, William Denton via wrote:
[...]
> I am trying to remember... when did DMK become HCP? I am thinking it
> was before ESA and z but I just don't remember... I sort of tuned out
> when IBM decided to no longer support VM and CMS at the source level.
It would be when the short lived VM/XA appeared.
The first appearance outside IBM of a CP that ran on an XA machine was the VM/XA Migration Aid, sometimes called XA/MA or XAMA, announced in 1981 (the same year as HPO for S/370).?
XA/MA was for running MVS/XA and MVS/370 guests during migration, but had only the barest support for anything CMS related. (Kind of like CMS on zVM today...?) A full-function VM/XA took several more years, and a bimodal CMS a few more (1988).
? Its been a while but doesn't VM/ESA 370 feature still have DMK CP Modules.
So 370 mode == DMK,
XA/ESA/Z == HCP
I'm pretty sure that's right.
Tony H.
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