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be able to run any of IBM's S/360 operating systems in a virtual machine, as contented users of CTSS they also knew that they wouldn't be satisfied using any of the available systems for their own development work or for the Center's other time-sharing requirements. Rasmussen, therefore, set up another small group under Creasy to build CMS (which was then called the “Cambridge
Monitor System”).
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Back during that last week of 1964, when they were working out the design for the
Control Program, Creasy and Comeau immediately recognized that they would need a second system, a console monitor system, to run in some of their virtual machines. Although they knew that with a bit of work they would
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The idea of a virtual machine system had been bruited about a bit before then, but it had never really been implemented. The idea of a virtual S/360 was new, but what was really important about their concept was that nobody until then had seen how elegantly a virtual machine system could be built,
98:
Creasy and Les Comeau spent the last week of 1964 joyfully brainstorming the design of CP-40, a new kind of operating system, a system that would provide not only virtual memory, but also virtual machines. They had seen that the cleanest way to protect users from one another (and to preserve
94:
Creasy had decided to build CP-40 while riding on the MTA. “I launched the effort between Xmas 1964 and year’s end, after making the decision while on an MTA bus from
Arlington to Cambridge. It was a Tuesday, I believe.” (R.J. Creasy, private communication with Melinda Varian, 1989.)
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compatibility as the new System/360 design evolved) was to use the System/360 Principles of
Operations manual to describe the user's interface to the Control Program. Each user would have a complete System/360 virtual machine (which at first was called a “pseudo-machine”).
87:. At the IBM Cambridge Scientific Center, Manager Norm Rasmussen was concerned that IBM was heading in the wrong direction. He decided to proceed with his own plan to build a timesharing system, with Bob Creasy leading what became known as the
70:
He died on August 11, 2005, in
Pioneer, California, survived by his wife, Rosalind, son Robert W. and wife Julie; daughter, Laura and husband Joel; grandson, Joel Alexander; brother, John and wife Kathy, and other relatives.
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In the fall of 1964, the future development of time sharing was problematical. IBM had lost the
Project MAC contract to GE, leading to the development of
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Like
Multics, CMS would draw heavily on the lessons taught by CTSS. Indeed, the CMS user interface would be very much like that of CTSS.
61:, intended to build a time sharing system based on IBM's System/360 and needed someone to lead the project, Creasy left MIT to join IBM.
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which was made available to IBM customers in 1967. In 1972, a revised version was released as IBM's
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in 1961, marrying
Rosalind Reeves that year. After graduation, he worked as a programmer on the
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Robert J. Creasy was born on
November 15, 1939, in Honesdale, Pennsylvania. He graduated from
57:. Disappointed with the direction of MAC, when he heard that Norm Rasmussen, Manager of IBM's
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22:(November 15, 1939 – August 11, 2005) was the project leader of the first
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with really very minor hardware changes and not much software.
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83:. IBM itself had committed to a time sharing system known as
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He retired from IBM's
Scientific Center in Palo Alto in 1993.
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195:"VM and the VM community, past present, and future"
64:Robert and Rosalind moved to California in 1965.
156:"The origin of the VM/370 time-sharing system"
113:The combination of CP-40 and CMS evolved into
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163:IBM Journal of Research & Development
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236:American computer scientists
202:SHARE 89 Sessions 9059-9061
59:Cambridge Scientific Center
16:American computer scientist
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53:timesharing system and on
193:Varian, Melinda (1997).
241:VM (operating system)
35:VM operating systems
179:10.1147/rd.255.0483
24:full virtualization
154:(September 1981).
20:Robert Jay Creasy
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182:. Retrieved
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231:2005 deaths
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173:: 483–490.
55:Project MAC
220:Categories
145:References
27:hypervisor
121:product.
91:Project.
41:Biography
31:IBM CP-40
81:Multics
119:VM/370
115:CP/CMS
29:, the
198:(PDF)
169:(5).
159:(PDF)
125:Notes
89:CP-40
209:2011
186:2011
51:CTSS
175:doi
171:IBM
85:TSS
47:MIT
222::
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