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- DECSYSTEM-20 abstract "The DECSYSTEM-20 was a 36-bit Digital Equipment Corporation PDP-10 mainframe computer running the TOPS-20 operating system (products introduced in 1977).PDP-10 computers running the TOPS-10 operating system were labeled DECsystem-10 as a way of differentiating them from the PDP-11. Later on, those systems running TOPS-20 (on the KL10 PDP-10 processors) were labeled DECSYSTEM-20 (the block capitals being the result of a lawsuit brought against DEC by Singer, which once made a computer called \"system-10\"). The DECSYSTEM-20 was sometimes called PDP-20, although this designation was never used by DEC.The following models were produced:DECSYSTEM-2020: bit-slice processor with up to 512 kilowords of solid state RAM (The ADP OnSite version of the DECSYSTEM-2020 supported 1 MW of RAM)DECSYSTEM-2040: ECL processor with up to 1024 kilowords of magnetic core RAMDECSYSTEM-2050: ECL processor with 2k words of cache and up to 1024 kilowords of RAMDECSYSTEM-2060: ECL processor with 2k words of cache and up to 4096 kilowords of solid state memoryDECSYSTEM-2065: DECSYSTEM-2060 with MCA25 pager (double-sized (1024 entry) two-way associative hardware page table)The only significant difference the user could see between a DECsystem-10 and a DECSYSTEM-20 was the operating system and the color of the paint. Most (but not all) machines sold to run TOPS-10 were painted \"Blasi Blue\", whereas most TOPS-20 machines were painted \"Terracotta\" (often mistakenly called \"Chinese Red\" or orange; the actual name of the color on the paint cans was Terracotta).There were some significant internal differences between the earlier KL10 Model A processors, used in the earlier DECsystem-10s running on KL10 processors, and the later KL10 Model Bs, used for the DECSYSTEM-20s. Model As used the original PDP-10 memory bus, with external memory modules. The later Model B processors used in the DECSYSTEM-20 used internal memory, mounted in the same cabinet as the CPU. The Model As also had different packaging; they came in the original tall PDP-10 cabinets, rather than the short ones used later on for the DECSYSTEM-20.The last released implementation of DEC's 36-bit architecture was the single cabinet DECSYSTEM-2020, using a KS10 processor.The DECSYSTEM-20 was primarily designed and used as a small mainframe for timesharing. That is, multiple users would concurrently log on to individual user accounts and share use of the main processor to compile and run applications. Separate disk allocations were maintained for all users by the operating system, and various levels of protection could be maintained by for System, Owner, Group, and World users. A model 2060, for example, could typically host up to 40 to 60 simultaneous users before exhibiting noticeably reduced response time.".
- DECSYSTEM-20 thumbnail DECsystem_2020_Logo.jpeg?width=300.
- DECSYSTEM-20 wikiPageExternalLink dec20.html.
- DECSYSTEM-20 wikiPageExternalLink www.livingcomputermuseum.org.
- DECSYSTEM-20 wikiPageExternalLink Bell-ComputerEngineering.pdf.
- DECSYSTEM-20 wikiPageExternalLink ad-h391a-t1.pdf.
- DECSYSTEM-20 wikiPageExternalLink fjcc72.
- DECSYSTEM-20 wikiPageExternalLink manual.
- DECSYSTEM-20 wikiPageExternalLink cudec20.html.
- DECSYSTEM-20 wikiPageExternalLink models.txt.
- DECSYSTEM-20 wikiPageID "23629".
- DECSYSTEM-20 wikiPageLength "5037".
- DECSYSTEM-20 wikiPageOutDegree "25".
- DECSYSTEM-20 wikiPageRevisionID "682142371".
- DECSYSTEM-20 wikiPageWikiLink 36-bit.
- DECSYSTEM-20 wikiPageWikiLink Bit_slicing.
- DECSYSTEM-20 wikiPageWikiLink Category:DEC_hardware.
- DECSYSTEM-20 wikiPageWikiLink Category:DEC_mainframe_computers.
- DECSYSTEM-20 wikiPageWikiLink Category:Products_introduced_in_1977.
- DECSYSTEM-20 wikiPageWikiLink Central_processing_unit.
- DECSYSTEM-20 wikiPageWikiLink Digital_Equipment_Corporation.
- DECSYSTEM-20 wikiPageWikiLink Gordon_Bell.
- DECSYSTEM-20 wikiPageWikiLink Living_Computer_Museum.
- DECSYSTEM-20 wikiPageWikiLink Magnetic-core_memory.
- DECSYSTEM-20 wikiPageWikiLink Mainframe_computer.
- DECSYSTEM-20 wikiPageWikiLink Operating_system.
- DECSYSTEM-20 wikiPageWikiLink PDP-10.
- DECSYSTEM-20 wikiPageWikiLink PDP-11.
- DECSYSTEM-20 wikiPageWikiLink Singer_Corporation.
- DECSYSTEM-20 wikiPageWikiLink Singer_System_10.
- DECSYSTEM-20 wikiPageWikiLink TOPS-10.
- DECSYSTEM-20 wikiPageWikiLink TOPS-20.
- DECSYSTEM-20 wikiPageWikiLink Time-sharing.
- DECSYSTEM-20 wikiPageWikiLink File:DECSYSTEM-2020_KS-10_(1979).jpg.
- DECSYSTEM-20 wikiPageWikiLink File:DECSYSTEM-20_KL-10_(1974).jpg.
- DECSYSTEM-20 wikiPageWikiLink File:DECsystem_2020_Logo.jpeg.
- DECSYSTEM-20 wikiPageWikiLinkText "DEC-20".
- DECSYSTEM-20 wikiPageWikiLinkText "DECSYSTEM-20".
- DECSYSTEM-20 wikiPageWikiLinkText "DECsystem 20".
- DECSYSTEM-20 wikiPageWikiLinkText "DECsystem".
- DECSYSTEM-20 wikiPageUsesTemplate Template:DEC_hardware.
- DECSYSTEM-20 wikiPageUsesTemplate Template:JargonFile.
- DECSYSTEM-20 wikiPageUsesTemplate Template:Reflist.
- DECSYSTEM-20 subject Category:DEC_hardware.
- DECSYSTEM-20 subject Category:DEC_mainframe_computers.
- DECSYSTEM-20 subject Category:Products_introduced_in_1977.
- DECSYSTEM-20 hypernym Computer.
- DECSYSTEM-20 type InformationAppliance.
- DECSYSTEM-20 type Computer.
- DECSYSTEM-20 type Redirect.
- DECSYSTEM-20 type Source.
- DECSYSTEM-20 comment "The DECSYSTEM-20 was a 36-bit Digital Equipment Corporation PDP-10 mainframe computer running the TOPS-20 operating system (products introduced in 1977).PDP-10 computers running the TOPS-10 operating system were labeled DECsystem-10 as a way of differentiating them from the PDP-11.".
- DECSYSTEM-20 label "DECSYSTEM-20".
- DECSYSTEM-20 sameAs Q3011188.
- DECSYSTEM-20 sameAs DECSYSTEM-20.
- DECSYSTEM-20 sameAs m.05wt6.
- DECSYSTEM-20 sameAs Q3011188.
- DECSYSTEM-20 wasDerivedFrom DECSYSTEM-20?oldid=682142371.
- DECSYSTEM-20 depiction DECsystem_2020_Logo.jpeg.
- DECSYSTEM-20 isPrimaryTopicOf DECSYSTEM-20.