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Topic: IBM 1620 Model I

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	Calibrating & Testing a GRAVITY MODEL for Any Size Urban rea - Aug 1983
		In essence, the gravity model says that trip interchange between zones is directly proportional to the relative attraction of each of the zones and inversely proportional to some function of the spatial separation between zones.
		A single purpose external model should be sufficient for most urban areas; however, if there is one type of dominant external movement such as travel to a military installation just outside the cordon, it may be desirable to isolate these trips into a separate trip category and to calibrate a separate model.
		Since the gravity model uses data directly from the field surveys to express all parameters except the traveltime factors, any difference between the two trip length frequency curves are due principally to the initial values of the traveltime factors.
	ntl.bts.gov /DOCS/CAT.html (16312 words)

	IBM 1620 Model I - Wikipedia, the free encyclopedia
		The IBM 1620 Model I was the original implementation of the IBM 1620 scientific computer, introduced in 1959.
		This unit (commonly called "1620" until the Model II was introduced) was produced as inexpensively as IBM could make it, in order to keep the price low.
		One industry magazine (Datamation) mentioned that the 1620 was the first IBM computer for which the basic system could be leased for a monthly rate less than its number.
	en.wikipedia.org /wiki/IBM_1620_Model_I (389 words)

	IBM 1620 Model II - Wikipedia, the free encyclopedia
		The IBM 1620 Model II (commonly called simply the Model II) was a vastly improved implementation, compared to the original Model I, of the IBM 1620 scientific computer architecture.
		The console typewriter was replaced with a modified Selectric typewriter, which could type at 15 cps – a 50% improvement over the Model I. The entire Core memory was in the IBM 1625 Memory unit.
		Memory cycle time was halved compared to the Model I's (internal or 1623 Memory unit), to 10μs (i.e., the cycle speed was raised to 100kHz) by using faster cores.
	en.wikipedia.org /wiki/IBM_1620_Model_II (411 words)

	IBM 1620: Definition and Links by Encyclopedian.com - All about IBM 1620
		A modified version of the 1620 was used as the CPU of the IBM 1710 Industrial Process Control System.
		IBM could only build one of the two and the Poughkeepsie proposal won because "the San Jose version is top of the line and not expandable, while your proposal has all kinds of expansion capability - never offer a machine that cannot be expanded".
		Following announcement of the IBM 1620 on October 22, 1959, due to an internal reorganization of IBM, it was decided to transfer the computer from the Data Processing Division at Poughkeepsie (large scale mainframe computers only) to the General Products Division at San Jose (small computers and support products only) for manufacturing.
	www.encyclopedian.com /ib/IBM-1620.html (1043 words)

	Science Fair Projects - IBM 1620
		The IBM 1620 was announced by IBM on October 21, 1959 and marketed as an inexpensive "scientific computer".
		Most of the logic circuitry of the 1620 was a type of resistor-transistor logic (RTL) using "drift" transistors (a type of transistor invented by Herbert Kroemer in 1957) for their speed, that IBM referred to as SDTRL.
		Work was begun on a 1620 Model III in year-TBD, but the project was quickly canceled as IBM wanted to promote sales of their new System/360 and discontinue the old lines.
	www.all-science-fair-projects.com /science_fair_projects_encyclopedia/IBM_1620 (1626 words)

	IBM 1620 Model II Info - Bored Net - Boredom (Site not responding. Last check: 2007-11-02)
		IBM 1620 Model II The IBM 1620 Model II (commonly called simply the Model II) was a vastly improved implementation, compared to the original Model I, of the IBM 1620 scientific computer architecture.
		The console typewriter was replaced with a Selectric typewriter, which could type at 15 cps – a 50% improvement over the Model I. The entire Core memory was in the IBM 1625 Memory unit.
		Memory cycle time was halved compared to the Model I's 1623, to 10μs (i.e., the cycle speed was raised to 100kHz) by using faster cores.
	www.borednet.com /e/n/encyclopedia/i/ib/ibm_1620_model_ii.html (332 words)

	wikien.info: Main_Page (Site not responding. Last check: 2007-11-02)
		The IBM 1720 was a pilot project to create a real-time process control computer based on the IBM 1620 Model I. Only three 1720 systems were ever built: one for the Amoco oil refinery in Whiting, Indiana; one for the Socal oil refinery in El Segundo, California; and one for E. du Pont in Wilmingt..
		The IBM 604 was a plug-board programmable Electronic Calculating Punch introduced in 1948, and was a machine on which considerable expectations for the future of IBM were pinned and in which a corresponding amount of planning talent was invested.
		The IBM p5 is the successor to the RS/6000 and to the pSeries.
	www.alanaditescili.net /browse.php?title=I/IB/IBM (4211 words)

	ibm 1620 - BlueRider.com
		Because the 1620 was popular with colleges, IBM ran a clearing house of software for a nominal cost such as Snobol, COBOL, chess games, etc.
		Some of the model I's options were standard on the model II, like indirect addressing and the console teletype changed from a model C to a Selectric.
		1620 consoles were used as props to represent Colossus in the film "The Forbin Project", though most of the machines had been scrapped by the time the film was made.
	ibm_1620.bluerider.com /wordsearch/ibm_1620 (601 words)

	IBM Archives: 1620 Data Processing System
		The IBM 1620 was a general-purpose, stored-program data processing system for small businesses, research and engineering departments of large companies, and schools requiring solutions to complex problems in the areas of engineering, research, and management science.
		With the 1711 model 2 and 1712 Multiplexer and Terminal Unit connected to the 1620, the computer not only received data from analog measuring devices, but fed results through the 1711/1712 to control processes by closing contacts which completed circuits to the instrumentation for closed-loop process control.
		1620 symbolic language allowed the programmer to refer to instructions and data in the program by name or other meaningful designation without regard to their location in the machine to facilitate relocating sections of programs, incorporating subroutines, and inserting or deleting instructions.
	www-1.ibm.com /ibm/history/exhibits/mainframe/mainframe_PP1620.html (1005 words)

	IBM 1620 -- Facts, Info, and Encyclopedia article (Site not responding. Last check: 2007-11-02)
		The IBM 1620 was announced by (Click link for more info and facts about IBM) IBM on October 21, 1959 and marketed as an inexpensive "scientific computer".
		Modified versions of the 1620 were used as the CPU of the (Click link for more info and facts about IBM 1710) IBM 1710 and (Click link for more info and facts about IBM 1720) IBM 1720 Industrial Process Control Systems.
		Work was begun on a 1620 Model III in year- (Click link for more info and facts about TBD) TBD, but the project was quickly canceled as IBM wanted to promote sales of their new (Click link for more info and facts about System/360) System/360 and discontinue the old lines.
	www.absoluteastronomy.com /encyclopedia/I/IB/IBM_16202.htm (1933 words)

	IBM 1620 (Site not responding. Last check: 2007-11-02)
		Most of the logic circuitry of the 1620 was a type of resistor-transistor logic (RTL) using "drift" transistors (a type of transistor invented by Herbert Kroemer in 1957) fortheir speed, that IBM referred to as SDTRL.
		Following announcement of the IBM 1620 on October 22, 1959, due to an internal reorganization of IBM, it was decided to transfer the computer from the Data ProcessingDivision at Poughkeepsie (large scale mainframe computers only) to the General Products Division at San Jose (small computers andsupport products only) for manufacturing.
		Work was begun on a 1620 Model III in year- TBD, but the projectwas quickly canceled as IBM wanted to promote sales of their new System/360 anddiscontinue the old lines.
	www.therfcc.org /ibm-1620-127982.html (1301 words)

	IBM 1620 Model II -- Facts, Info, and Encyclopedia article (Site not responding. Last check: 2007-11-02)
		IBM 1620 Model II The IBM 1620 Model II (commonly called simply the Model II) was a vastly improved implementation, compared to the original (Click link for more info and facts about Model I) Model I, of the (Click link for more info and facts about IBM 1620) IBM 1620 scientific computer architecture.
		The console typewriter was replaced with a modified (Click link for more info and facts about Selectric) Selectric typewriter, which could type at 15 cps – a 50% improvement over the Model I. The entire (Click link for more info and facts about Core memory) Core memory was in the IBM 1625 Memory unit.
		Memory cycle time was halved compared to the Model I's (internal or 1623 Memory unit), to 10 (Click link for more info and facts about μs) μs (i.e., the cycle speed was raised to 100 (One thousand periods per second) kHz) by using faster cores.
	www.absoluteastronomy.com /encyclopedia/I/IB/IBM_1620_Model_II3.htm (458 words)

	IBM 1720 - Encyclopedia, History, Geography and Biography
		The IBM 1720 was a pilot project to create a real-time process control computer based on the IBM 1620 Model I.
		Only three 1720 systems were ever built: one for the Amoco oil refinery in Whiting, Indiana; one for the Socal oil refinery in El Segundo, California; and one for E.
		The 1720 led to the IBM 1710 Process Control systems that IBM marketed in the 1960s; these were cheaper and less elaborate than the 1720.
	www.arikah.net /encyclopedia/IBM_1720 (151 words)

	IBM 1620 Model I -- Facts, Info, and Encyclopedia article (Site not responding. Last check: 2007-11-02)
		The IBM 1620 Model I was the original implementation of the (Click link for more info and facts about IBM 1620) IBM 1620 scientific computer, introduced in 1959.
		This unit (commonly called "1620" until the (Click link for more info and facts about Model II) Model II was introduced) was produced as inexpensively as (Click link for more info and facts about IBM) IBM could make it, in order to keep the price low.
		The console typewriter was a modified (Click link for more info and facts about Model B1) Model B1, which typed at only 10 characters per second.
	www.absoluteastronomy.com /encyclopedia/I/IB/IBM_1620_Model_I2.htm (420 words)

	History of computing: IBM 1620 (Site not responding. Last check: 2007-11-02)
		Development History In 1958 IBM assembled a team at the Poughkeepsie, New York development laboratory to study the "small scientific market".
		Implementation "Levels" of the IBM 1620 * Model I o Level A; prototype.
		o Level G; final version of the Model I * Model II * Model III o Work was begun on a 1620 Model III in TBD, but the project was quickly canceled as IBM wanted to promote sales of their new System/360 and discontinue the old lines.
	www.theparentingsearch.com /History_of_computing/IBM_1620.shtml (895 words)

	IBM 1620 Model II
		The IBM 1620 II (commonly called simply the Model II) was a vastly improved version of the original IBM 1620 architecture.
		The console typewriter was replaced with a Selectric typewriter, which could type at 15 character per second.
		The entire Core memory was in the IBM 1625 Memory unit.
	www.ebroadcast.com.au /lookup/encyclopedia/16/1620_II.html (262 words)

	IBM 1620 Model I: Definition and Links by Encyclopedian.com - All about IBM 1620 Model I
		IBM 1620 Model I: Definition and Links by Encyclopedian.com - All about IBM 1620 Model I
		The IBM 1620 I was the original implementation of the IBM 1620, introduced in 1959.
		One industry magazine (Datamation) mentioned that the 1620 was the first IBM computer for which the basic system could be leased for a monthly rate less than its number :=)
	www.encyclopedian.com /ib/IBM-1620-Model-I.html (303 words)

	IBM 1620 Model I (Site not responding. Last check: 2007-11-02)
		The IBM 1620 Model I was the original implementation of the IBM1620 scientific computer, introduced in 1959.
		This unit (commonly called "1620" until the Model II wasintroduced) was produced as inexpensively as IBM could make it, in order to keep the price low.
		The console typewriter was an Model B, which typedat only 10 characters per second.
	www.therfcc.org /ibm-1620-model-i-327657.html (357 words)

	Subject: IBM 1620 SIMULATOR & IBM 1316 DISK STORAGE PACKS (Site not responding. Last check: 2007-11-02)
		The IBM 1316 Disk Storage Pack, which stores 2 million digits or 1 million alphameric characters, was used at the University on a IBM 1311 Disk Storage Drive, Model 3.
		The IBM 1316 Disk Pack was easily removed and replaced with another 1316 Disk Pack when used on the 1311 Disk Drive.
		This Simulator was written by IBM in the Basic Assembler Language (BAL) for the IBM 360/370 Computer Systems and simulated all the IBM 1620 machine language instructions.
	hissa.nist.gov /mlists/ibm1620/199901/19990119-4.html (272 words)

	Dword - Ptr (Site not responding. Last check: 2007-11-02)
		This is convenient because converting the index of an item in an array into the address of the IBM 702, IBM 705, IBM 7080, IBM 7010, UNIVAC 1050, IBM 1401, jld ptr 91 and IBM 1620.
		This class of machines included ptr the IBM 360, and has the advantage of allowing ptr instructions to use minimally-sized fields to contain addresses, which can permit a smaller ptr worldofwarcraft com instruction size or a larger variety of sizes of data ptr tennis transferred between the processing part of the architecture.
		For example, instruction fetches on an IBM 1620 Model I take 8 cycles ptr just to read the 12 digits of the 8086, its ptr wow word size may be used for: When a computer architecture is designed, the choice of a byte.
	ptr.pay-e-bullion.org /dword/ptr.html (3208 words)

	[No title]
		LGP-30 When I came to the University of Alberta in 1963 the Computing Centre was operating an IBM 1620 in a closed-shop manner with users submitting their programs and data on decks of punched cards which were processed by Computing Centre staff.
		The 1620 had been purchased in 1961 as a replacement for the LGP-30 which continued to be used until the middle of 1963.
		IBM 5100 In the late 1960s Bill Adams and I began to experiment with the use of computers in the classroom.
	www.cs.ualberta.ca /~smillie/ComputerAndMe/TextTwo.txt (4509 words)

	Some IBM Machines that I have Worked On (Site not responding. Last check: 2007-11-02)
		IBM hired some college graduates in the 60's that were put in an 'accelerated management' program.
		IBM management had the bright idea along about 1970 to use CEs that had shown their ability to fix tough bugs as Area Designated Specialist.
		IBM said that if a person ingested some toner it would be "flushed out of the lungs by normal action of the cilia inside the air passages" and no harm would be done....
	home.comcast.net /~suptjud/IBMMachines.htm (6091 words)

	USATODAY.com - Pioneer IBM finally finds its way out of the PC wilderness (Site not responding. Last check: 2007-11-02)
		IBM's entry into PCs witrh this 1981 model legitimized the new technology but ran counter to its core strength.
		Back then, IBM dominated computing the way Fidel Castro dominates Cuba, and Apple was like some dissident whose radical ideas were catching on.
		But IBM started losing business to companies such as Compaq and later Gateway and Dell — companies that were created to make and sell PCs.
	www.usatoday.com /money/industries/technology/maney/2004-12-07-ibm_x.htm (892 words)

	IBM 1620
		Because the 1620 was popular with colleges, IBM ran a clearing house of software for a nominal cost such as Snobol, COBOL, chess games, etc.
		Some of the model I's options were standard on the model II, like indirect addressing and the console teletype changed from a model C to a Selectric.
		1620 consoles were used as props to represent Colossus in the film "The Forbin Project", though most of the machines had been scrapped by the time the film was made.
	burks.brighton.ac.uk /burks/foldoc/96/54.htm (598 words)

	Encyclopedia: IBM 1620 Model I (Site not responding. Last check: 2007-11-02)
		International Business Machines Corporation (IBM, or colloquially, Big Blue) (NYSE: IBM) (incorporated June 15, 1911, in operation since 1888) is headquartered in Armonk, New York, USA.
		(This typewriter had a very 'nasty' habit of breaking off its "0" hammer and throwing it across the room in the middle of a long core dump!) Operating IBM 1620 computer (Model 1 Level G) at the Computer History Museum.
		The IBM Electric typewriters were a series of electric typewriters that IBM manufactured, starting in the late 1940s.
	www.nationmaster.com /encyclopedia/IBM-1620-Model-I (674 words)

	1. Introduction
		Various U.K. models and their associated databases are made available to academic researchers through the Bureau.] The second event was Lucas's (1976) critique, which argued that the models are not likely to be useful for policy purposes.
		In the full information case, the entire model is estimated at the same time by full information maximum likelihood, where the restriction is imposed that the expectations of future values of variables are equal to the model's predictions of the future values.
		A model may be specified and constrained in ways that lead it to have "reasonable" properties from the point of view of the model builder, but this does not necessarily mean that it is a good approximation of the economy.
	fairmodel.econ.yale.edu /MM/MM1.HTM (6398 words)

	IBM Model Numbers
		IBM equipment tends to have 4-digit model numbers, and it is a great trivia game to see who can keep the numbers straight.
		The keyboard and print mechanism were based on the IBM Selectric office typewriter, and the whole setup was built into a pedestal that could be extended with a small cabinet on either side to make a desk for a typist.
		Mechanical pickers (one or two, depending on the 3850 model) went back and forth between the storage walls, moved vertically and pivoted to reach the desired slot, then pulled a cartridge and carried it to one of multiple tape drive stations.
	www.beagle-ears.com /lars/engineer/comphist/ibm_nos.htm (1830 words)

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