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The VM/CMS Resource – Directory & Links
From Mainframes.in – Home of Legacy & Mainframes Online
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The VM/CMS section of Mainframes.in provides a listing of WWW resources for VM/VMS mainframe systems. Mainframes.in is a comprehensive online resource for legacy and mainframe systems.
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Content derived from Wikipedia article on VM/CMS
VM/CMS From Wikipedia, the free encyclopedia
VM/CMS (Virtual Machine/Conversational Monitor System, originally called CP/CMS when it first appeared) is a bundled pair of operating systems used on IBM System/360, System/370, System/390, zSeries, and System z9 mainframes (and compatible systems). (Other operating systems for IBM mainframes include z/OS, z/TPF, z/VSE, Linux on zSeries, MVS, and MUSIC/SP.)
VM/CMS has two main components, VM and CMS, each an independent operating system. VM is a virtual machine operating system which provides each user with what seems to be their own personal mainframe. CMS is a relatively simple single-user operating system, designed to run principally in a virtual machine. Each VM/CMS user is given their own virtual machine in which to run CMS. When used with CMS, VM is an operating system which can support users, not just a hypervisor.
Contents
1 History 2 Further reading 3 See also 4 External links
History Development started on what was then called the "CP-40 Project," working with a modified System 360 Model 40, at IBM's Cambridge Scientific Center (CSC) in the autumn of 1964. CP-40 was a virtual machine operating system. A simple interactive computing single-user operating system, CMS, was designed to go along with it. Actual implementation started in 1965, and the complete system was first available to users in early 1966.
VM/CMS was not started as a formal IBM product, and for many years there was a great deal of political infighting within IBM over what resources should be available to the project as compared with competing IBM products. The basic "problem" was that VM/CMS arguably reduced customers' need for hardware, and IBM was, after all, in the business of selling computer systems.
After IBM announced the System/360 Model 67, the first system to feature early VM-oriented hardware, the software was converted to run on that. CP-40 was renamed CP-67 at that point. An early version of the system was installed at MIT's Lincoln Laboratory in 1967 because of Lincoln's dissatisfaction with the "standard" IBM time-sharing offering, TSS (Time Sharing System), which was at that time very slow and unreliable. Lincoln personnel co-operated with CSC in improving the system. Another influential IBM customer, Union Carbide, also decided to run VM/CMS and also contributed to its development.
By early 1968, word had spread, and most Model 67 sites were actually running VM/CMS, not the "official" IBM system for the machine, TSS. This popularity helped contribute to the demise of TSS in 1971.
Thereafter, the utility of the system — especially within IBM, where it was heavily used in developing MVS — prevented all attempts to kill it. IBM finally accepted the inevitable with relatively good grace, having learned through internal experience just how useful it was. That's fortunate, because today z/VM is all but mandatory to run Linux on zSeries.
IBM and third parties offer many applications for VM/CMS. Perhaps the most famous was OfficeVision, although today third parties offer HTTP servers, databases, etc. Further reading Melinda Varian, VM and the VM Community: Past, Present, and Future (available online here) is an excellent detailed history, starting with CP-40 and its roots. Bob DuCharme, Operating Systems Handbook, Part 5: VM/CMS (available online here) is a fairly detailed user's guide to VM/CMS.
See also Linux on zSeries z/VM Hercules - a S/370, S/390, and zSeries emulator capable of running MVS
External links Short History of IBM's Virtual Machines The IBM 360/67 and CP/CMS Retrieved from http://en.wikipedia.org/wiki/VM/CMS
End of Wikipedia content, http://en.wikipedia.org/wiki/VM/CMS
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