CP/CMS

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CP/CMS

(Control Program/Conversational Monitor System) An early operating system from IBM that provided a virtual machine environment. Introduced in the late 1960s, it was the predecessor to IBM's VM operating system, which came out in 1972. CP provided the virtual machine function, while CMS was a lightweight operating system that ran in its own virtual machine for each user.

A Separate Research Group
The virtual machine timesharing concepts in CP/CMS were not part of IBM's mainstream development, because the System/360 line, a huge undertaking for the company, was geared toward batch processing. These developments were undertaken by IBM's Cambridge Scientific Center (CSC), founded in 1964 (CMS originally stood for Cambridge Monitor System). Due to academic pressure, IBM announced the System/360 timesharing Model 67, which featured virtual memory hardware. Before it could obtain the new model, CSC customized a Model 40 and developed CP-40/CMS, launched in 1967. It was followed by CP-67/CMS for the Model 67 and CP-370/CMS, renamed VM/370 in 1972 for the System/370 and subsequent IBM mainframe lines. See VM and System/360.
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lt;p>The first stake in the ground was CP-40, an operating system for the System/360 mainframe that IBM's Robert Creasy and Les Comeau started developing in 1964 to create VMs within the mainframe.
Asimismo, el CP-40 de 1967, tambien de IBM, era un sistema operativo de tiempo compartido para maquinas virtuales con memoria virtual, desarrollado por el Centro Cientifico Cambridge de IBM.
A pesar de los avances obtenidos por la firma y el apoyo a esta tecnologia, internamente existia una pugna entre los defensores de los sistemas de tiempo compartido y quienes preferian el procesamiento por lotes, ello hizo que la comunidad de cientificos dedicados al computo se inclinaran hacia sistemas como Multics, UNIX y TOPS-20, aunque el precedente que sento el CP-40 sigue siendo de importancia en los sistemas actuales.