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Compiled by Reg Harbeck
System/360 line of mainframes debuted on April 7
Six models
24 bit (16 MB) addressability
IBM promises any program that runs on one will run on all; kept promise on future models
Foundational architecture for all subsequent IBM mainframes
OS/360 and DOS/360 operating systems for the platform available as of 1966
IBM CICS teleprocessing monitor initial released
Allowing multiple users to concurrently access the same applications and data online
← Apollo 11 mission astronauts Neil Armstrong and Buzz Aldrin landed on the moon on July 20
Earth-based computing support by IBM System/360
IBM announced System/370 line of mainframes
Basis for virtualization and other innovations of the 1970s, including features such as Dynamic Address Translation
The original Virtual Machine (VM/SP) introduced
The “original hypervisor” allowing multiple concurrent OS images of various IBM mainframe OSes
Multiple Virtual Storage (MVS/SP) announced
IBM issues Statement of Integrity for MVS and all subsequent versions
Four years later, in 1983, it became VSE/SP
In 1991 VSE/SP became VSE/ESA
In 2022 renamed VSEn by 21CS
DOS/360, which became DOS/VS becomes DOS/VSE and eventually VSEn
IBM announced the IBM System/370-XA (extended) architecture
31-bit XA addressing mode available while retaining compatibility with 24-bit addressing
Hardware platform for MVS/XA and VM/XA OSes
IBM introduced Enterprise Systems Architecture/370 (ESA/370)
Hardware platform for subsequently announced MVS/ESA, VM/ESA and VSE/ESA OSes
Transitioned from Bipolar to CMOS processor technology by the end of the decade
Soon became the platform for OpenEdition MVS, OS/390 and Unix System Services
IBM introduced Parallel Sysplex
Able to run and manage numerous workloads on multiple mainframes as if they were a single machine
Allowed Linux workloads to join the enterprise-class environment of the mainframe seamlessly
Able to run thousands of concurrent images on a single physical mainframe using hypervisors such as z/VM
64-bit memory addressability
Basis for z/OS, z/VM, z/VSE, z/TPF
Basis for specialty processors: IFL-2000, System z Application Assist Processor (zAAP, 2004) and System z Integrated Information Processor (zIIP, 2006)
IBM introduces System z hardware platform
IBM announced LinuxONE
The first Linux-only mainframe
All the strengths of mainframe hardware and hypervisor technology focused on running massive numbers of Linux images concurrently on a single hardware instance
Zowe was introduced
An open source, extensible next generation graphical online environment for IBM mainframe users
Supported by contributions from numerous mainframe organizations, now notably including IBM, Broadcom, Rocket Software and Phoenix Software International
IBM announced z15 mainframe with 19-inch footprint
Fits on a single raised floor data center tile
Mainframe increasingly responds to the physical parameters for generic enterprise servers
IBM announced Telum processor
On-chip real-time AI
Quantum-resistant encryption
Advanced shared cache across CPUs
At the heart of the z16 mainframe announced in 2022
IBM debuted rack mount configurations of IBM z16 and IBM LinuxONE 4
Mainframe now fits into the same rack space as any other platform
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