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→x86 architecture: removed false statement that 32-bit segmentation allows a 16 GiB address space, see https://stackoverflow.com/questions/4039325/assembly-segmented-model-32bit-memory-limit for an explanation of why that is not possible |
→History: would like to see a citation for that |
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==History==
The [[Burroughs Corporation]] [[Burroughs large systems|B5000]] computer was one of the first to implement segmentation, and "perhaps the first commercial computer to provide virtual memory"<ref>{{cite web |last=Mayer |first=Alastair J. W. |title=The Architecture of the Burroughs B5000 - 20 Years Later and Still Ahead of the Times? |url=http://www.smecc.org/The%20Architecture%20%20of%20the%20Burroughs%20B-5000.htm |access-date=2012-03-15}}</ref> based on segmentation. The B5000 is equipped with a segment information table called the Program Reference Table (PRT) which is used to indicate whether the corresponding segment resides in the main memory, to maintain the [[base address]] and the size of the segment.<ref>{{cite book |title=Computer Architecture and Organization |last=Hayes |first=John P. |isbn=0-07-027363-4 |year=1978 |page=371|publisher=McGraw-Hill }}</ref> The later [[Burroughs large systems#B6500|B6500]] computer also implemented segmentation; a version of its architecture is still in use today on the Unisys ClearPath Libra servers.{{Citation needed}}
The [[GE 645]] computer, a modification of the [[GE-600 series|GE-635]] with segmentation and paging support added, was designed in 1964 to support [[Multics]].
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