Re: VM/ESA 370 (was Re: VM/370 new thrilling experience)
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On Tue, 12 Nov 2024 at 11:36, Drew Derbyshire via <swhobbit= [email protected]> wrote: [...]
On Mon, Nov 11, 2024 at 12:41 AM, William Denton wrote:
I'm not even sure VM/XA CP even had any VM/SP or VM/HPO code. The progression was:
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CPTOOL (???) ¡ª>
VM/XA Migration Aid (1982?) ¡ª>
VM/XA System Facility (1985?) ¡ª>
VM/XA SP (1988) ¡ª>
VM/ESA ¡ª>
z/VM
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CPTOOL was internal use only to help get MVS/XA up. I don't know from who, when, or where it came, but time wise it may have predated VM/HPO.
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I doubt the CPTOOL changes came from the official VM/370 team; the CPTOOL team may have just grabbed the virgin VM/370 source and ran with it.
I was told that the VM/SP HPO folks did make serious progress to run on XA hardware, but the VM/XA official releases all came from the CPTOOL tree.?
Some of this is discussed in Melinda's History of VM paper.? [soon after 1976] "...several of the most knowledgeable CP people who did go to Poughkeepsie, including Dick Newson and Per Jonas, were put into a separate group whose purpose was to build a tool that could be used for the development of MVS/XA. Pete Tallman, of VMA fame, also joined what came to be known as the ¡°VM Tool¡± project as soon as it moved to Poughkeepsie. Starting with VM/370 Release 3, PLC 06, the VM Tool group began building a fast, stripped-down CP that would create XA virtual machines on a real 370 so that the MVS developers could test MVS/XA." and later
"Meanwhile, hidden away in a corner of Poughkeepsie, the VM Tool group, which had grown to a dozen people by 1980, continued to work on building an XA CP system and SIE microcode to support MVS/XA development and testing. By 1977, they had gotten together a system that would support XA guests (in 24-bit addressing mode) on a real S/370 with SIE emulated in software. They first IPLed an XA processor with SIE in microcode in October, 1979. By August, 1980, they had an XA VM system using SIE in production. Although their official purpose was to support MVS development, the group was composed of passionate VM loyalists who very much wanted to create an XA VM for VM customers."
Tony H.
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