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	Scientific Data Systems - Wikipedia, the free encyclopedia
		SDS was an early adopter of integrated circuits in computer design and the first to employ silicon transistors.
		Much of this success was due to the use of silicon-based transistors in their earliest designs, the 24-bit SDS 910 and SDS 920 which included a hardware (integer) multiplier.
		The 910 and 920 were supplanted by the SDS 9300, announced in June 1963.
	en.wikipedia.org /wiki/Scientific_Data_Systems (1005 words)

	SDS-940 Simulator Configuration (Site not responding. Last check: 2007-11-01)
		The first system, the SDS 900, was succeeded by the SDS 920 and SDS 930.
		The SDS 940 is a commercial version of Project Genie's modified SDS 930.
		It was succeeded by the SDS 9300, which was not compatible.
	simh.trailing-edge.com /sds940.html (132 words)

	NLS (computer system) - Wikipedia, the free encyclopedia
		Funded by ARPA, NASA, and the U.S. Air Force, NLS was designed around a Scientific Data Systems SDS 940 time-sharing computer with an approximately 96 MB storage disk.
		As a crude stopgap measure, he developed a system where off-line users -- that is, anyone not sitting at the one terminal available -- could still edit their documents by punching a string of commands onto paper tape with a Flexowriter.
		When the funding finally materialized for an advanced SDS 940 where multiple users could be on-line simultaneously, the acronym OLS was already taken, so Engelbart settled for NLS.
	en.wikipedia.org /wiki/On-Line_System (995 words)

	Project Genie - Wikipedia, the free encyclopedia
		The SDS 940 mainframe would be used as the hardware for Douglas Engelbart's OnLine System at the Stanford Research Institute.
		The system that SDS (later XDS) would call the 940 was created by modifying an SDS 930 24-bit commercial computer so that it could be used for timesharing.
		When SDS realized the value of the time sharing system, and that the software was in the public domain, they came back to Berkeley and collected enough information to begin manufacturing.
	en.wikipedia.org /wiki/Project_Genie (433 words)

	C:\BELLBO~1\COMPSR&E\HTMFILES\00000295.HTM
		The hardware modifications to the SDS 930, together with the operating system software, were sold by Scientific Data Systems as the SDS 940.
		The 940 uses a memory map which is almost a subset of that of Atlas but is more modest than that of the IBM 360/67 [Arden et al., 1966] and GE 645 [Dennis, 1965; Daley and Dennis, 1968].
		The SDS 945 is a successor to the 940, with slightly increased capability but at a lower cost.
	research.microsoft.com /~gbell/computer_structures__readings_and_examples/00000295.htm (427 words)

	The COMPUTER That Will Not Die: The SDS Sigma 7
		By February 1966, SDS announced the SDS 940, a time-sharing system which was backward compatible with the previous systems (except the SDS 92 which was a 12 bit computer).
		The design of the SDS 940 is very complex because of the backward compatibility with the 930 etc. and the needed changes to support time-sharing.
		SDS 9300, 930, 925, 92, 940, Sigma 7, 2.
	www.andrews.edu /~calkins/profess/SDSigma7.htm (3597 words)

	CHAC SDS 930 Rescue (Site not responding. Last check: 2007-11-01)
		The rescue of the SDS 930 mainframe formerly at the Space Environment Center, Boulder, CO, USA, was accomplished with complete success on Wednesday, October 11, 1995, when CHAC took delivery of fourteen racks, two Teletypes, a console, a VDT, and approximately forty boxes of tapes, docs and spares, to a total of 10,300 pounds.
		SDS' computers were good enough to worry DEC, which was a direct competitor and about to go public; good enough to worry the mighty IBM, which had just bet the company on the System/360.
		And the 930 was then the top of SDS' line, for which the Space Environment Laboratory forked over three hundred thousand dollars – the rough equivalent of US$1.2 million today.
	www.chac.org /chsds930.html (580 words)

	DEC PDP-1 (Site not responding. Last check: 2007-11-01)
		Their principal competitor in this area was SDS (Scientific Data Systems) in Southern California - which built the competing Sigma series of computers.
		SDS was later purchased by Xerox, and renamed XDS.
		The SRI 940 was replaced by a specially-modified PDP-10 around 1970 - the modifications, made my BB&N, added paged memory and helped make this machine one of the first few hosts on the ARPA Net.
	www.sonic.net /~peterbe/banner/PDP1.html (421 words)

	Tymshare
		The Berkeley group had documented the hardware changes that they had made to the machine very well and SDS agreed to deliver a new series of machine, the SDS 940, which incorporated just those changes.
		SDS also arranged to interface a Data Products disk and some fixed head Vermont Drums to the system to make the system better suited for timesharing.
		SDS delivered the machine but had not improved the software from Berkeley to the extent that we had.
	www.cap-lore.com /Tymshare (663 words)

	The Harvard Crimson :: News :: Computers: The Supply Equals the Demand, But the Money Might Be Hard to Come By
		Most of the time fewer than the maximum 32 are in use, and the answering signal precedes a minute or two of silence during which the caller turns from telephone to teletype and begins to make conversation.
		For the Computer Center, and for Harvard, the attraction of the SDS 940 lies in its ability to solve comparatively small problems instantly, and to serve users all over the University.
		As a rule, computer work done by math, statistics and physics students is of the sort the SDS can accommodate: small in input, even when the solution process is complex.
	www.thecrimson.com /article.aspx?ref=110166 (1008 words)

	Butler Lampson - Systems
		It was widely used on the SDS 940, and many of its techniques were adopted by Tymshare for their interactive SuperBasic system.
		Snobol (1965-69): I designed two Snobol systems for the SDS 940, one for Snobol 3 (which I implemented), and the other for Snobol 4 without user data types (implemented by two students).
		It was used for a great deal of systems programming on the SDS 940 at a number of research institutions.
	research.microsoft.com /lampson/Systems.html (2161 words)

	[No title]
		SDS was Scientific Data Systems in El Segundo, California, later acquired by Xerox and known as XDS.
		Also, SDS was touting as a follow- on, the Sigma-7 then under development, which would be larger, faster, and do all the things we could possibly want.
		SDS had even published several ads in trade magazines touting their forthcoming system as "the best timesharing system not yet available".
	www.samurajdata.se /~cj/funny/txt/tops20.txt (13731 words)

	Roots of Keykos
		That computer was a careful copy by SDS (Scientific Data Systems) of the SDS 930 as modified by Mel Pirtle at project Genie at Berkeley to add virtual memory.
		While extensive modifications to the software and hardware were necessary, such as swapping to drum instead of to magnetic tape, the architecture of the Berkeley system was maintained throughout the lifetime of the SDS 940 at Tymshare.
		About that time the 940 had become profitable and we were free to pursue the Digital Equipment PDP-10 system that had a powerful classic timesharing system from the MIT school of design.
	www.cap-lore.com /CapTheory/KK/EKK.html (838 words)

	tymnet - definition by dict.die.net
		The Tymshare hosts (which ran customer code) were SDS 940, DEC PDP-10, and eventually IBM 370 computers.
		Xerox XDS 940 might have been used if Xerox, who bought the design for the SDS 940 from Scientific Data Systems, had ever built any.
		La Roy Tymes (who always insisted that his name was NOT the source of the name) wrote the first supervisor which ran on the 940.
	dict.die.net /tymnet (587 words)

	Xerox Data Systems Model 940 - Computing Reference - eLook.org
		(SDS 940, XDS 940) A time-sharing system, announced in February 1966, developed by Scientific Data Systems with help from The University of California at Berkeley and Tymshare.
		SDS 940 was backward compatible with SDS's previous systems (except the 12-bit SDS 92).
		It had monitor and user modes, dynamic program relocation, automatic memory fragmentation, and system protection.
	www.elook.org /computing/xerox-data-systems-model-940.htm (82 words)

	22C:116, Homework 3, Fall 2002
		Background: The Berkeley Timesharing System was implemented on the SDS 940 computer, made by Scientific Data Systems, a company that Xerox later bought, renamed Xerox Data Systems, and ran into the ground.
		The SDS 9x0 family of machines had 24-bit words with an 8-bit opcode, 2 bits of address mode, and 14 bits of physical address.
		The 940, introduced in 1966, was basically a 930 with an added memory management unit.
	www.cs.uiowa.edu /~jones/opsys/hw/03.html (620 words)

	rfc1000
		These sites were running a Sigma 7 with the SEX operating system, an SDS 940 with the Genie operating system, an IBM 360/75 with OS/MVT (or perhaps OS/MFT), and a DEC PDP-10 with the Tenex operating system.
		SDS, the builder of the Sigma 7, wanted many months and many dollars to do the job.
		940 GADS Apr 85 Toward an Internet Standard Scheme for Subnetting Several sites now contain a complex of local links connected to the Internet via a gateway.
	ietfreport.isoc.org /idref/rfc1000 (12159 words)

	[No title]
		Also, SDS was touting as a follow-on, the Sigma-7 then under development, which would be larger, faster, and do all the things we could ever possibly want.
		MULTICS had developed the concept of segmentation and of file-process mapping, that is, using the virtual address space as a "window" on data which permanently resides in a file.
		That in turn allowed such things as a system command language interpreter which ran in unprivileged mode and a debugger which did not share address space with the program under test and therefore was not subject to being destroyed by a runaway program.
	www.panda.com /tops-20/Murphy-paper.txt (16528 words)

	Publication Search Results
		In addition, maneuvering tactics designed during previous simulation experiments are being written into SDS 940 computer programs that will call the immediate action routines in the proper sequence to accomplish simple missions.
		The SDS 940 computer system is now almost fully operational and will soon be utilized by the automaton project.
		Our present status, then, can best be described as having nearly completed all preparatory work, placing us in a position to begin actual experiments with the automaton.
	www.ai.sri.com /pub_list/1070 (323 words)

	[No title]
		The SDS fellows working on the system had been yanked away from it the instant they admitted it might be working, and the thing was shipped off to Los Altos from Santa Monica without concern for niceties like clearing lunch, tools, and dropped parts out of the machine.
		The first 940 was created by modifying an SDS 930 commercial computer so that it could be used for timesharing.
		The paragraphs on SDS are "in passing", and are not a detailed historical account of SDS's contracts to churn out programmers.
	memex.org /cm-archive2.html (16809 words)

	ARPANET - Facts, Information, and Encyclopedia Reference article
		This record is an excerpt from the "IMP Log" kept at UCLA, and describes setting up a message transmission to go from the UCLA SDS Sigma 7 Host computer to the SRI SDS 940 Host computer.
		UCLA, where Kleinrock had established a Network Measurement Center (with an SDS Sigma 7 being the first computer attached to it).
		The Stanford Research Institute's Augmentation Research Center, where Douglas Engelbart had created the ground-breaking NLS system, a very important early hypertext system (with the SDS 940 that ran NLS, named 'Genie', being the first host attached).
	www.startsurfing.com /encyclopedia/a/r/p/ARPANET_190c.html (2621 words)

	Xerox from FOLDOC
		The XDS 530 was probably under development at SDS before the buy-out but only announced afterwards.
		After 1968 Xerox bought out SDS and renamed the SDS machines "Xerox Data Systems" (XDS).
		Nearby terms: Xerox Data Systems Model 530 « Xerox Data Systems Model 940 « XEROX Network Services « Xerox Network System » XEROX PARC » Xerox Star » XFree86 Project, Inc.
	foldoc.org /?Xerox (712 words)

	ARNAS Quaterly Report No.5.[May-Aug.1967] (Site not responding. Last check: 2007-11-01)
		2a5a SDS is working on the problem and if it is not solved before the end of the acceptance period (4 August) the acceptance period will slip.
		1g1 We plan to couple our SDS 940 into the communication network, and to develop the software necessary to set up a "circuit" and to communicate with any of the other computers.
		This machine could be an SDS 94D, an IBM 360/50, an IRM 360/67, a UNIVAC 1108, a PDP-6, etc. Connected to the primary processor is another machine called the message processor (MP).
	sloan.stanford.edu /mousesite/EngelbartPapers/B2_F9_ARNAS5.html (12244 words)

	A Research Center for Augmenting Human Intellect (1968)
		3a1b The consoles are served by an SDS 940 time-sharing computer dedicated to full-time service for this staff, and each console may operate entirely independently of the others.
		Though it was designed to operate from a Teletype terminal, this system gains a great deal in speed and power by merely showing with a display the last 26 lines of what would have been on the Teletype output.
		However, with the 940 variable priority scheme for memory access (see Pirtle1), we expect less than 1 percent degradation in CPU efficiency due to this load.
	www.bootstrap.org /augdocs/friedewald030402/researchcenter1968/ResearchCenter1968.html (6474 words)

	Beyond LISP 1.5 (Site not responding. Last check: 2007-11-01)
		However, it was not then known that the dominant machine for AI research would be the PDP-10, a successor of the PDP-6.
		BBN and SRI made what proved to be an architectural digression in doing AI work on the SDS 940 computer.
		The existence of an interpreter and the absence of declarations makes it particularly natural to use LISP in a time-sharing environment.
	www-formal.stanford.edu /jmc/history/lisp/node5.html (544 words)

	Jack B
		One of several novel features of this system was the ability of a user to employ a symbolic debugging tool (an early version of the DDT program) with no possibility of disruption of the debugger by the program under test.
		Similar features were later incorporated into the SDS 940 computer used in the Genie time-sharing system at the University of California at Berkeley, and into the design of the DEC PDP-11/45 computer, the machine model that supported development of the UNIX operating system at Bell Laboratories.
		In the early days of M.I.T.'s Project MAC, Professor Dennis worked with Edward Glaser of the Multics team to specify the unique segment addressing and paging mechanisms that became a fundamental part of the General Electric model 645 computer (later the Honeywell 6180).
	www.csg.lcs.mit.edu /Users/dennis/biography.htm (1052 words)

	TYMNET (Site not responding. Last check: 2007-11-01)
		When Tymshare started using Interdata 8/32 minicomputers as nodes they started developing TYMNET on PDP-10.
		The Tymshare hosts (which ran customer code) were SDS 940, XDS 940[?], DEC PDP-10, and eventually IBM 370 computers.
		Laroy Tymes (who always insisted that his name was NOT the source of the name) wrote the first supervisor which ran on the 940.
	burks.bton.ac.uk /burks/foldoc/48/120.htm (511 words)

	Engelbart: Study for the development of Human Augmentation Techniques (1968) (Site not responding. Last check: 2007-11-01)
		Essentially everyone in the program became involved, and for a period of about six months did all of this work by means of FLTS or NLTS.
		1A1B In late Spring of 1967, our staff began to concentrate upon implementation of the 940 hardware and software that we had specified, and their use of the 3100 system fell off considerably.
		1A1B1 The software-development work was done with the SDS 940 on-line (Teletype) programming systems which are supplied as manufacturer-maintained subsystems -- i.e., writing/editing (QED), assembler (ARPAS), and loader-debugger (DDT).
	sloan.stanford.edu /MouseSite/Archive/Post68/FinalReport1968/study68Results.html (4097 words)

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