What's surprising to me is that z/OS is coming up on 24 years old:

1974: OS/VS2R2
1978: MVS/SE
1980: MVS/SP
1983: MVS/XA
1988: MVS/ESA
1995: OS/390
2000: z/OS

Look back at the big architectural changes in MVS. So big that they 
necessitated a change in the product name each time. [Except OS/390, which was 
packaging and marketing 😊 ]

Compared to that, z/OS seems to be stagnant. Or stable, take your pick.

-----Original Message-----
From: IBM Mainframe Discussion List <IBM-MAIN@LISTSERV.UA.EDU> On Behalf Of 
Timothy Sipples
Sent: Wednesday, July 3, 2024 8:46 PM
To: IBM-MAIN@LISTSERV.UA.EDU
Subject: OS/VS2 Release 2: Happy 50th Anniversary!

My colleagues point out an interesting anniversary. IBM introduced OS/VS2 
Release 2 (IBM Program Number 5752-VS2) on July 3, 1974. The history is a 
little complicated, but essentially it's the date when "MVS" was born. Today's 
z/OS 3.1 operating system is the direct, lineal descendent of OS/VS2 Release 2. 
Of course z/OS is vastly more capable and broader in scope.

Happy 50th anniversary!

OS/VS2 Release 2 was WAY before my time. Do you have any personal memories?

—————
Timothy Sipples
Senior Architect
Digital Assets, Industry Solutions, and Cybersecurity
IBM Z/LinuxONE, Asia-Pacific
sipp...@sg.ibm.com


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