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Revision Date Username Comment
929 Dec 2015 - 18:11ThomasMisa 
803 Oct 2013 - 15:40norqu036? 
719 Apr 2013 - 11:26NicLewis 
619 Apr 2013 - 10:12NicLewis 
512 Mar 2013 - 10:19NicLewis 
405 Mar 2013 - 09:25NicLewis 
304 Mar 2013 - 11:24NicLewis 
225 Feb 2013 - 10:40NicLewis 
121 Feb 2013 - 09:23NicLewis 

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Cambridge CAP computer


The Cambridge CAP computer successfully used security capabilities in both hardware and software. Part of a project on memory protection at the University of Cambridge Computer Laboratory between 1970 and 1977, the CAP computer ran a 32-bit processor. The CAP operating system used a process tree structure that featured a master coordinator, allowing each process to access the resources of its children without separate modes of operation. This meant that each process did not require special privileges or operating system intervention when addressing a linked subprocess. In practice, only two levels of this process hierarchy were used. An advantage of this system of process privilege control was its enhanced security of protected objects, while avoiding heavy system loads had each process been addressing the operating system for each system resource request.(1)

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1 : lock Henry M. Levy, Compatibility-Based Computer Systems, (Digital Press, 1984), 79-83. (Log-in required)

Topic revision: r9 - 29 Dec 2015 - 18:11:19 - ThomasMisa
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