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The Cambridge CAP computer and its protection system

R. M. Needham, R. D.H. Walker
1977 Proceedings of the sixth symposium on Operating systems principles - SOSP '77  
This paper gives an outline of the architecture of the CAP computer as it concerns capability-based protection and then gives an account of how protected procedures are used in the construction of an operating  ...  system.  ...  Acknowledgements The CAP project is supported by tile Science Research Council. We  ... 
doi:10.1145/800214.806541 dblp:conf/sosp/NeedhamW77 fatcat:h6hv3axnlnbppov2xdjmdbtijq

In support of domain structure for operating systems

Douglas Cook
1979 Proceedings of the seventh symposium on Operating systems principles - SOSP '79  
One approach advocated in the search for better designed and more reliable operating systems is to base the design on the use of small protection domains.  ...  This paper presents empirical evidence to show that, with a suitable architecture, the overheads associated with using small protection domains do not make this an impractical approach.  ...  of the CAP project at Cambridge University ~3].  ... 
doi:10.1145/800215.806580 dblp:conf/sosp/Cook79 fatcat:eitzk36rkbawbecnui2evrjq6u

Roger Michael Needham CBE FREng. 9 February 1935 - 1 March 2003: Elected F.R.S. 1985

T. Hoare, M. V. Wilkes
2004 Biographical Memoirs of Fellows of the Royal Society  
We are particularly indebted to the following who, at various times, worked alongside Needham in the Computer Laboratory at Cambridge University and in some cases also at The frontispiece photograph was  ...  ACKNOWLEDGEMENTS We are indebted to the many friends and colleagues we have consulted during the preparation of this memoir.  ...  The project was a major one and involved the design and construction of a full-scale mini-computerknown as the Cambridge CAP Computerand the writing of an operating system for it.  ... 
doi:10.1098/rsbm.2004.0014 fatcat:jiokchzxlrh3pk5qvtue2apaoa

Page 21 of Computer Performance Vol. 5, Issue 1 [page]

1984 Computer Performance  
ACM Vol 15 No 3 (March 1972) pp 150-156 Wilkes, M V and Needham, R M The Cambridge CAP computer and its operating system E\sevier/North Holland, Netherlands (1979) lliffe, J K Basic machine principles  ...  Comput. Vol C22 No 7 (July 1973) pp 644-655 Bic, L ‘A protection model and its implementations in a dataflow system’ Commun.  ... 

Page 132 of Journal of Research and Practice in Information Technology Vol. 20, Issue 3 [page]

1988 Journal of Research and Practice in Information Technology  
Reprinted in The Cambridge CAP Computer and its Operating System by Wilkes and Needham, North-Holland, 1979. IBM (1978): IBM — System/38 Technical Developments, ISBN 0-933186-00-2.  ...  ENGLAND, D.M. (1974): Capability Concept and Protection in System 250, Proc. of the International Workshop on Protection in Operating Systems, IRIA, pp. 63-82.  ... 

Systems aspects of The Cambridge Ring

R. M. Needham
1979 Proceedings of the seventh symposium on Operating systems principles - SOSP '79  
On the CAP, a computer built for research into memory protection but now available as a general purpose shared machine, the packet protocol, including port number checking, is handled entirely by microcode  ...  mechanisms such as Ethernet systems (Metcalfe & Boggs, 1976) , and the purpose of the present paper is to describe the way in which the properties of the ring affect the general systems aspects of its  ... 
doi:10.1145/800215.806573 dblp:conf/sosp/Needham79 fatcat:2zx6gtxnwfbtroawkzcibdehle

Page 188 of Finishing Today Vol. 67, Issue 12 [page]

1991 Finishing Today  
Options include electronics computer temperature-compensated viscosity. Cambridge Applied Systems Inc.  ...  Viscosity is derived by timing the travel of a magnetically driven piston. It can be used with non- Newtonian and waterborne coatings.  ... 

Direct Imaging of Low-Dimensional Nanostructures

Andrew R. Lupini, Bethany M. Hudak, Jiaming Song, Hunter Sims, Yogesh Sharma, T. Zac Ward, Sokrates T. Pantelides, Paul C. Snijders
2018 Microscopy and Microanalysis  
Silicon is the ideal substrate to explore such questions, both because it is compatible with existing electronic components and manufacturing technologies and, for quantum computing applications, because  ...  Previously work presents apparently conflicting evidence as to whether the nanowires can survive overgrowth with a protective capping layer.  ...  Silicon is the ideal substrate to explore such questions, both because it is compatible with existing electronic components and manufacturing technologies and, for quantum computing applications, because  ... 
doi:10.1017/s1431927618000946 fatcat:fkakl6x2a5d65p6i6g4gmbh7mq

David John Wheeler. 9 February 1927 -- 13 December 2004: Elected FRS 1981

M. Campbell-Kelly
2006 Biographical Memoirs of Fellows of the Royal Society  
The frontispiece photograph was taken in 1981 by Godfrey Argent, and is reproduced with permission. BIBLIOGRAPHY The following publications are those referred to directly in the text.  ...  The Laboratory's two most important projects at that time were the CAP computer and the Cambridge Ring. The CAP computer project (not an acronym) ran from 1970 to 1979.  ...  Most importantly, it was necessary to design a memory protection system so that it was possible for several user programs to co-exist safely in the memory of the computer.  ... 
doi:10.1098/rsbm.2006.0030 fatcat:owdvpx7lbvg3xnqoqlgopzw3ra

In Situ Lorentz Differential Phase Contrast STEM Characterization of Rashba Interaction on Skyrmion Thin Films

B. D. Esser, A. S. Ahmed, K. Meng, J. Rowland, M. Randeria, R. K. Kawakami, F. Y. Yang, D. W. McComb
2018 Microscopy and Microanalysis  
Theory and experiment both show that materials with the skyrmion phase are potential candidates for next generation storage and computation because they are robust to defects due to their topological protection  ...  The FeGe system inherently exhibits Bloch skyrmions because of its noncentrosymmetric crystal structure; however, the addition of a metallic thin film cap adds a Rashba DM interaction, the magnitude of  ...  Theory and experiment both show that materials with the skyrmion phase are potential candidates for next generation storage and computation because they are robust to defects due to their topological protection  ... 
doi:10.1017/s1431927618009984 fatcat:bjudbuhzgfa7dosc4iiwrywgfe

Protective Effect of Antioxidative Liposomes Co-encapsulating Astaxanthin and Capsaicin on CCl4-Induced Liver Injury

Tatsuya Fukuta, Shota Hirai, Tatsusada Yoshida, Takashi Maoka, Kentaro Kogure
2020 Biological and Pharmaceutical Bulletin  
Although liposomes co-encapsulating Asx-R and Cap (Asx-R/Cap-Lipo) at an optimal ratio clearly showed synergistic antioxidative activity in vitro, it is unclear whether the effective antioxidative activity  ...  Importantly, the treatment with Asx-R/Cap-Lipo tended to show higher protective effect on acute liver injury than combined treatment with Asx-R-Lipo plus Cap-Lipo.  ...  Acknowledgments This research was supported by the Research Program for the Development of Intelligent Tokushima Artificial Exosome (iTEX) from Tokushima University.  ... 
doi:10.1248/bpb.b20-00116 pmid:32741949 fatcat:7sxwskmcwnazngjsgzqxznnzpm

A Universal File Server

A.D. Birrell, R.M. Needham
1980 IEEE Transactions on Software Engineering  
It is desirable for a file server to be able to support multiple ife directory and access management systems, so that the designer of a client system retains the freedom to design the system that best  ...  The paper explores the dedgn issues associated with such a file server and proposes some solutions.  ...  Needham is with the Computer Laboratory, University of Cambridge, Cambridge, England.  ... 
doi:10.1109/tse.1980.230493 fatcat:f6yyv2v6vzcx5jn5s7snphwk6e

Ongoing research and development on information protection

Jerome H. Saltzer
1974 ACM SIGOPS Operating Systems Review  
Acknowledgement Many individuals involved in the projects described here spent time patiently explaining their activities to me, putting together written descriptions for me to work from, and reviewing  ...  Thanks are due all of them, but responsibility for mistakes and omissions is my own.  ...  University of Cambridge: The Cambridge Capability System Roger Needham of the Computer Laboratory of the University of Cambridge (England) is leading a hardware/software development project to create a  ... 
doi:10.1145/775275.775278 fatcat:c5o7efmfwfczln4art3y5q2n4a

Washington News

1996 MRS bulletin  
Although computers and other technologies have, in recent years, become more prominent in classroom teaching, the use of technology has not become commonplace in most classrooms as it has in the majority  ...  International efforts should be encouraged to protect intellectual property rights and to establish them for new fields such as global information systems and biotechnology. • A sustained effort is needed  ... 
doi:10.1557/s0883769400032048 fatcat:dngiljuqszeynmx4mdisjo3zwa

Virtualization

Andrew Herbert
2015 SOSP History Day 2015 on - SOSP '15  
18 Peter Denning, Franz Kaashoek and Mike Schroeder have kindly read through several previous versions of this document correcting my errors and pointing me at important work that I was either unaware  ...  Needham and R. Walker, "The Cambridge CAP computer and its protection system", Proc.  ...  This idea was readily exploited capability-based operating systems such as the Cambridge CAP Computer which added to its hardware supported capabilities for memory segments abstract "software capabilities  ... 
doi:10.1145/2830903.2830909 dblp:conf/sosp/Herbert15 fatcat:mposov6rcjchvbagkz7476zppu
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