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304:. 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 delayed response time.
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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
289:
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
281:
Introduction and
Reference Card for the DECSYSTEM-20 at Columbia University, 1980. The DECSYSTEM-20 was the mainstay of computing at Columbia from 1977 through 1988.
316:
of
Seattle, Washington, maintained a 2065 running TOPS-10, which was available to interested parties via SSH upon registration (at no cost) at their website.
294:. 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.
992:
337:, Alan Kotok, Thomas N. Hasting, Richard Hill, "The Evolution of the DECsystem-10", in C. Gordon Bell, J. Craig Mudge, John E. McNamara,
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The last released implementation of DEC's 36-bit architecture was the single cabinet DECSYSTEM-2020, using a KS10 processor.
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collection of timesharing and interactive computers, including an operational DECSYSTEM-20 KL-10 2065
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Model B processors used in the DECSYSTEM-20 used internal memory, mounted in the same cabinet as the
273:: DECSYSTEM-2060 with MCA25 pager (double-sized (1024 entry) two-way associative hardware page table)
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286:"Chinese Red" or orange; the actual name of the color on the paint cans was Terra Cotta).
267:: KL10 ECL processor with 2k words of cache and up to 4096 kilowords of solid state memory
8:
241:
of solid state RAM (The ADP OnSite version of the DECSYSTEM-2020 supported 1 MW of RAM)
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198:. Later on, those systems running TOPS-20 (on the KL10 PDP-10 processors) were labeled
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453:"Introduction to DECSYSTEM-20 Assembly Language Programming" (Ralph E. Gorin, 1981,
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261:: KL10 ECL processor with 2k words of cache and up to 1024 kilowords of RAM
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The DECSYSTEM-20 was primarily designed and used as a small mainframe for
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2 DECSYSTEM-2020 KS-10s (1979) at the Living
Computer Museum
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Computer
Engineering: A DEC View of Hardware Systems Design
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441:
DECsystem-10/DECSYSTEM-20 Processor
Reference Manual
436:. Daniel L. Murphy. AFIPS Proceedings, 1972 FJCC.
218:, although this designation was never used by DEC.
348:The DECSYSTEM-20 at Columbia University 1977–1988
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474:—Explains all the various KL-10 models in detail
411:"Re: dec cabinet paint (and/was "11/34 done")"
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433:Storage Organization and Management in TENEX
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214:"). The DECSYSTEM-20 was sometimes called
194:as a way of differentiating them from the
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25:
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251:processor with up to 1024 kilowords of
993:Computer-related introductions in 1977
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483:Login into the Living Computer Museum
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385:Columbia University Computing History
326:This article is based in part on the
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210:, which once made a computer called "
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226:The following models were produced:
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381:"Columbia University DECSYSTEM-20"
346:Frank da Cruz, Christine Gianone,
343:(Digital Equipment, Bedford, 1979)
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40:DECSYSTEM-20 KL-10 (1974) at the
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478:Columbia University DECSYSTEM-20
448:Manuals for DEC 36-bit computers
409:North, Don (November 21, 2006).
330:, which is in the public domain.
873:DEC 7000 AXP and DEC 10000 AXP
372:
355:
190:operating system were labeled
1:
524:Digital Equipment Corporation
368:. March 21, 1977. p. 75.
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165:Digital Equipment Corporation
63:Digital Equipment Corporation
903:Digital Personal Workstation
817:Digital Personal Workstation
180:and was introduced in 1977.
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94:; 47 years ago
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144:DECSYSTEM-2020 front panel
16:Type of mainframe computer
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73:Programmed Data Processor
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988:DEC mainframe computers
774:VAX 7000 and VAX 10000
314:Living Computer Museum
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186:computers running the
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42:Living Computer Museum
934:List of VAX computers
387:. Columbia University
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151:
143:
924:Itsy Pocket Computer
485:, a portal into the
362:"Singer System 10".
171:mainframe computers
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308:Remaining machines
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83:Mainframe computer
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845:DECsystem servers
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259:DECSYSTEM-2050
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231:DECSYSTEM-2020
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50:Also known as
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898:AlphaStation
883:DEC 2000 AXP
868:DEC 4000 AXP
863:DEC 3000 AXP
670:DECSYSTEM-20
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391:November 13,
389:. Retrieved
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192:DECsystem-10
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173:running the
158:DECSYSTEM-20
157:
155:
89:Release date
20:DECSYSTEM-20
893:AlphaServer
792:Rainbow 100
328:Jargon File
302:timesharing
977:Categories
840:DECstation
807:DECstation
739:VAXstation
487:Paul Allen
415:classiccmp
320:References
124:DEC 36-bit
749:VAXserver
526:computers
239:kilowords
235:bit-slice
59:Developer
952:Category
912:See also
764:VAX 9000
759:VAX 4000
754:VAX 6000
734:VAX 8000
729:MicroVAX
443:". 1982.
120:Platform
962:Commons
797:VAXmate
744:Firefly
631:DECmate
619:PDP-8/e
247:: KL10
233:: KS10
188:TOPS-10
175:TOPS-20
129:Related
113:TOPS-20
97: (
888:Multia
822:HiNote
812:Multia
724:VAX-11
688:PDP-11
680:16-bit
665:PDP-10
652:36-bit
636:PDP-14
626:PDP-12
602:LINC-8
589:12-bit
579:PDP-15
551:18-bit
457:
222:Models
216:PDP-20
208:Singer
196:PDP-11
184:PDP-10
168:PDP-10
162:36-bit
133:PDP-10
54:PDP-20
855:Alpha
802:DECpc
769:VAXft
660:PDP-6
614:PDP-8
609:PDP-5
574:PDP-9
569:PDP-7
564:PDP-4
559:PDP-1
832:MIPS
597:LINC
455:ISBN
393:2022
312:The
156:The
99:1977
92:1977
79:Type
784:x86
716:VAX
533:PDP
292:CPU
255:RAM
249:ECL
206:by
204:DEC
979::
450:".
413:.
401:^
383:.
516:e
509:t
502:v
461:)
446:"
439:"
395:.
101:)
Text is available under the Creative Commons Attribution-ShareAlike License. Additional terms may apply.
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