Computers & Business Machines
Imagine the loss, 100 years from now, if museums hadn't begun preserving the artifacts of the computer age. The last few decades offer proof positive of why museums must collect continuously—to document technological and social transformations already underway.
The museum's collections contain mainframes, minicomputers, microcomputers, and handheld devices. Computers range from the pioneering ENIAC to microcomputers like the Altair and the Apple I. A Cray2 supercomputer is part of the collections, along with one of the towers of IBM's Deep Blue, the computer that defeated reigning champion Garry Kasparov in a chess match in 1997. Computer components and peripherals, games, software, manuals, and other documents are part of the collections. Some of the instruments of business include adding machines, calculators, typewriters, dictating machines, fax machines, cash registers, and photocopiers
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Wang LOCI-2 Electronic Calculator
- Description
- One of the first programmable electronic calculators, this instrument was announced in 1964 and sold from 1965. It was designed by An Wang (1920-1990) and his associates. Wang, a native of Shanghai, immigrated to the United States after World War II, studied computer science at Harvard University, and worked at the Harvard Computation Laboratory. He started his own business in 1951, producing magnetic core memories and other electronic equipment on order. The LOCI or “logarithmic calculating instrument” was the first product marketed by the company. Two versions of the machine were announced: the LOCI I, which was not programmable, and the LOCI II, which was.
- The desktop machine has nine digit keys arranged in an array, as well as a zero bar and a decimal point key. Depressing other keys changes the sign of the number, shifts the decimal point, shifts from the logarithmic to the work register, and shifts from the work to the logarithmic register. Further keys are for arithmetic operations, squares, square roots, inverse squares, inverse square roots, inverse logarithms, and clearance of various registers. To the right are controls for the decrement counter, the program counter, and the operation code. According to company advertising, the machine offers ten-digit precision in addition and subtraction and eight-digit precision in multiplication, division, exponentiation, root extraction, and logarithm computation. It has five storage registers of ten-digit capacity and a ten-digit display, plus a display for the sign of the answer. A cooling fan and a cord are at the back. The card reader attachment that plugs into the back holds program cards.
- A tag on the front of the machine reads: LOCI-2. A tag on the back reads: ELECTRONIC SYSTEMS AND DEVICES (/) LOCI II (/) MODEL NO. 2AB (/) SERIAL NO. 2734 (/) TEWKSBURY, MASS. U.S.A. A paper tag on the back of the machine indicates that it was serviced 4/28/68, 9/12/68, and 2/9/71.
- According to a 1964 flier, the machine was to sell for $4,750.00. Kenney says that the initial price was $6,500. Wang Laboratories would go on to sell the 300 series of calculators (from 1966) and the 700 series (from 1969), and to manufacture minicomputers and networked microcomputers.
- For related objects and documents, see 1980.0096.02 through 1980.0096.10.
- Compare 1980.0096.01 with the later 1983.0171.01 (a Wang Series 700 calculator), and the even later 2011.0022.01 (a Wang Series 600 calculator).
- References:
- There is an extensive discussion of the LOCI II at the website of the Old Calculator Museum. See:http://www.oldcalculatormuseum.com/wangloci.html
- Wang Laboratories, Inc., “LOCI-2 Open New Vistas to your Personal Computing . . .,” Tewksbury, Ma., 1964. This is 1980.0096.08. A similar leaflet describes the LOCI-1 and has museum number 1980.0096.07.
- Charles C. Kenney, Riding the Runaway Horse: The Rise and Decline of Wang Laboratories, Boston: Little, Brown and Co., 1992.
- date made
- 1965 or later
- date received
- 1980
- maker
- Wang Laboratories
- ID Number
- 1980.0096.01
- catalog number
- 1980.0096.01
- accession number
- 1980.0096
- Data Source
- National Museum of American History
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Bound Printout from COBOL Test Program Run December 6, 1960, at RCA
- Description
- COBOL was one of the first programming languages designed to run on computers built by several different manufacturers. In December 1960 programmers at Remington Rand UNIVAC and at RCA successfully ran the same COBOL test programs on a Univac II and an RCA 501 computer.
- This is the printout from the RCA demonstration. It contains two programs. One produces a profit and loss report for a corporation. It is a modification of a program developed by Warren G. Simmons of US Steel for a UNIVAC II.
- According to the printout, the actual program used in the test was written by J. Farinelli. This was probably programmer Joseph D. Farinelli of US Steel. The second program, which computes cash sales and credit balances, was written by Carl H. Thorne Jr. of the General Services Administration for an RCA computer.
- Location
- Currently not on view
- date made
- 1960
- maker
- RCA Corporation
- ID Number
- 2010.3050.2
- catalog number
- 2010.3050.2
- nonaccession number
- 2010.3050
- Data Source
- National Museum of American History
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SCM Marchant Cogito 240 Electronic Calculator
- Description
- This ten-key, non-printing electronic desktop calculator performs the four arithmetic operations of addition, subtraction, multiplication, and division. The factors and results are stored in three registers, two of twelve-digit capacity and the third, of twenty-four digits. The content of these registers appears in three rows on a cathode ray tube display. The top row (K) shows the entry from the keyboard, the second row (Q) the second factor or the quotient, and the third row (P) the total, product, or dividend.
- In front of the display is the keyboard, with an array of digit keys at the center, keys for arithmetic functions and memory on the right, and on the left reset, register transfer, register entry, recall, and exchange keys.
- A mark on the left front of the machine reads: SCM MARCHANT. A mark behind the keyboard and below the screen reads: COGITO 240.
- In the summer of 1965, the SCM Marchant Division of SCM Corporation announced that it would begin to sell the company’s first electronic calculators that fall. These were the Cogito 240 and a similar machine, the Cogito 240SR, which also had the ability to take square roots. The 240 was to sell for $2,195, and the 240SR for $2,395. The machines were manufactured at a company plant in Oakland, California.
- According to Bensene, the machine was designed by computer pioneer Stanley Frankel, who had worked on the Manhattan Project, run programs on the ENIAC computer, headed the Computation Laboratory at the California Institute of Technology, and contributed to the design of minicomputers such as the LGP-30 and the Packard-Bell PB-250. Frankel worked on the design at Computron Corporation, a subsidiary of the California firm of Electrosolids. Not long after the British firm of Sumlock Comptometer released a desktop electronic calculator in 1961 (see the Anita Mark VIII), SCM acquired Computron Corporation, and Frankel and his team moved there to develop the Cogito 240.
- The calculator was quickly replaced by other electronic calculators in the SCM line. SCM dropped out of the calculator business entirely in 1972.
- References:
- R. Bensene, “SCM Marchant Cogito 240SR Electronic Desktop Computer,” at the website The Old Calculator Museum, accessed March 28, 2013.
- SCM Marchant, Cogito 240-240SR Service Manual & Parts List, Oakland, Calif.: SCM Corporation, 1965. This is 1979.3084.72.
- W. D. Smith, “Electronic Calculators Gaining,” New York Times, August 7, 1965, p. 25.
- “Presenting a new, highly advanced electronic calculator the Cogito 240,” Los Angeles Times, June 17, 1965, p. B10. Similar advertisements ran in the Chicago Tribune, Washington Post, and New York Times.
- Location
- Currently not on view
- date made
- ca 1966
- maker
- SCM Corporation
- ID Number
- CI.335373
- accession number
- 318944
- catalog number
- 335373
- Data Source
- National Museum of American History
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Mainframe Computer Component, Magnetic Wire Cartridge for the DYSEAC
- Location
- Currently not on view
- date made
- ca 1960
- maker
- National Bureau of Standards
- ID Number
- 2013.0084.03
- accession number
- 2013.0084
- catalog number
- 2013.0084.03
- Data Source
- National Museum of American History
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Punch Cards used with a PDP-9 Minicomputer
- Description
- In the mid-1960s, the Computer Science Department at RAND Corporation turned its attention to developing computer graphics. A set of programs written in the programming language FORTRAN for the PDP-9 minicomputer were used to plot contour lines useful in determining the line of sight for microwave radiation emitted from a given point on a map.
- Groups of the punch cards are not numbered but some are grouped by black marks on the edge. The cards have the data for a FORTRAN program with non-accession number 1990.3046.10. The cards are white with a pink, green or no border on the top. A mark on the first card reads: 8258, CLAF6, D7300, 04M, 100CD, 150P, C.
- Location
- Currently not on view
- date made
- 1968
- maker
- IBM
- ID Number
- 1990.3046.06
- catalog number
- 1990.3046.06
- nonaccession number
- 1990.3046
- Data Source
- National Museum of American History
-
Punch Cards Used with a PDP-9 Minicomputer
- Description
- In the mid-1960s, the Computer Science Department at RAND Corporation turned its attention to developing computer graphics. A set of programs written in the programming language FORTRAN for the PDP-9 minicomputer were used to plot contour lines useful in determining the line of sight for microwave radiation emitted from a given point on a map. These cards have some of the data for one of these programs. The cards are white with a pink border on the top.
- Groups of cards are numbered from 31 through 45. The program has non-accession number 1990.3046.10. A mark on the top card reads: DATE GENERATED 4-11-68.
- Location
- Currently not on view
- date made
- 1968
- maker
- IBM
- ID Number
- 1990.3046.02
- catalog number
- 1990.3046.02
- nonaccession number
- 1990.3046
- Data Source
- National Museum of American History
-
Friden Model 1150 Desktop Electronic Calculator
- Description
- This electronic calculator was introduced by the Friden Division of Singer Company in 1968. It was the first printing calculator sold by that company. The instrument has an array of nine square plastic keys for entering digits as well as a zero bar and a decimal point bar. Right of the digit keys are addition and subtraction keys. Left are other function keys. Above these keys are memory, clearance and duplication keys. At the top left is a place for a paper tape.
- A mark on the front of the calculator reads: Friden. Another mark there reads: 1150 ELECTRONIC PRINTING CALCULATOR. According to the accession file, the machine has serial number 532. According to contemporary newspaper advertisements, it sold for $1,495 at a time when rival electronic printing calculators cost between $2,250 and $3,800.
- References:
- Accession File.
- [Advertisement], Washington Post, March 19 1968, p. 23.
- [Advertisement], New York Times, February 27 1968, p. 68.
- Location
- Currently not on view
- date made
- 1968
- maker
- Friden, Inc.
- ID Number
- CI.334381
- catalog number
- 334381
- accession number
- 313935
- Data Source
- National Museum of American History
-
Logic Unit for the Green Machine, A Prototype Desktop Electronic Calculator
- Description
- As a graduate student in electrical engineering at the University of California – Berkeley, Thomas E. Osborne began thinking about the design of a desktop electronic calculator that could compute the very large and very small numbers encountered in scientific work. In January of 1964 he formed the firm Logic Design, Inc., to develop his ideas. By late 1964 he had built a prototype keyboard and display (1978.0311.01), as well as this prototype logic unit.
- The framework of the logic unit is a group of five rectangular perforated boards, arranged in the shape of a box. Numerous smaller boards are perpendicular to the base and to three of the sides. Metal supports are along the base of two opposite sides. Circuit components include transistors, resistors, capacitors, diodes, and a plug. A second plug is loose in the box.
- Elements of the green machine were incorporated in Hewlett-Packard’s first commercial electronic calculator, the HP9100. For a prototype of that machine, see 1978.0311.03. For related documentation, see invention notebooks and photographs by Osborne (1978.0311.03 through 1978.0311.14). For purchase orders of components used in the prototype, see 1985.0264.01.
- References:
- Bernard M. Oliver, “How the Model 9100A Was Developed,” Hewlett-Packard Journal, September, 1968. A copy of this article is at the HP Museum website.
- The website of the University of Wyoming contains biographical information about Osborne.
- Location
- Currently not on view
- date made
- 1964
- date received
- 1978
- maker
- Osborne, Thomas E.
- ID Number
- 1978.0311.02
- accession number
- 1978.0311
- catalog number
- 1978.0311.02
- Data Source
- National Museum of American History
-
Punch Cards Used with a PDP-9 Minicomputer
- Description
- In the mid-1960s, the Computer Science Department at RAND Corporation turned its attention to developing computer graphics. A set of programs written in the programming language FORTRAN for the PDP-9 minicomputer were used to plot contour lines useful in determining the line of sight for microwave radiation emitted from a given point on a map. These cards have some of the data for one of these programs. The cards are white with a pink border on the top.
- Groups of cards are numbered from 16 through 30. A mark on the top card reads: DATE GENERATED 4-11-68.The program has non-accession number 1990.3046.10.
- Location
- Currently not on view
- date made
- 1968
- maker
- IBM
- ID Number
- 1990.3046.03
- catalog number
- 1990.3046.03
- nonaccession number
- 1990.3046
- Data Source
- National Museum of American History
-
Wang Loci-2 Card Reader
- Description
- The Wang LOCI II is one of relatively few calculators that had a variety of peripheral equipment. Included in the price of the machine was this metal card reader, painted light blue. It read specially designed punched program cards. A card is in the reader.
- A mark on the bottom of the card reader reads: Wang Laboratories, Inc. (/) ELECTRONIC SYSTEMS AND DEVICES (/) LOCI CARD READER (/) MODEL NO. [blank] (/) SERLAL NO. 22806 (/) TEWKSBURY, MASS. U.S.A.
- For further information about the LOCI II, see 1980.0096.01.
- Location
- Currently not on view
- date made
- 1965 or later
- maker
- Wang Laboratories
- ID Number
- 1980.0096.01.1
- accession number
- 1980.0096
- catalog number
- 1980.0096.01.1
- Data Source
- National Museum of American History
-
Punch Cards used with a PDP-9 Minicomputer
- Description
- In the mid-1960s, the Computer Science Department at RAND Corporation turned its attention to developing computer graphics. A set of programs written in the programming language FORTRAN for the PDP-9 minicomputer were used to plot contour lines useful in determining the line of sight for microwave radiation emitted from a given point on a map. These cards have some of the data for one of these programs. The cards are white with a pink border on the top (occasional cards have a green border). Groups of cards are not numbered but groups of data are designated by black marks on the edge. A mark on the first card reads: 3000 500. A printout of a related program has non-accession number 1990.3046.10.
- Location
- Currently not on view
- date made
- 1968
- maker
- IBM
- ID Number
- 1990.3046.05
- catalog number
- 1990.3046.05
- nonaccession number
- 1990.3046
- Data Source
- National Museum of American History
-
Friden Model 130 Desktop Electronic Calculator
- Description
- This is one of the first fully transistorized electronic calculators. The hefty instrument has an array of nine square plastic digit keys, with a zero bar and a decimal point bar below these. In addition to keys for the four arithmetic operations, it has change sign, enter, repeat, clear entry, clear all, store, recall, and overflow lock keys. A decimal point selector dial is on the right.
- In entering arithmetic operations into the calculator, one first keys in a number, then pushes the enter key, then keys in the second number, and then pushes the key for the operator (e.g. the + key for addition). This way of representing arithmetic operations is known as reverse Polish notation, and would be used on several electronic calculators.
- Behind the keyboard is a cathode ray tube display that shows four rows of numbers. Each line shows 13 digits. If the numbers are smaller, the digits to the left are zeroes. The bottom line of the display shows the answers, and numeric entries as they are entered.
- Tags on the front and on the back of the machine read: Friden. A mark on the front next to the display reads: 130 ELECTRONIC CALCULATOR. A mark on the bottom at the front reads: MODEL 130 SER 9479.
- The Friden Calculating Machine Company began manufacturing mechanical calculating machines in California in the 1930s. In 1963 Friden was acquired by Singer Company. In August of 1964, the Friden 130 electronic calculator went on the market, selling for $2,150. Within a year, the price was down to $1,695. Friden soon introduced the 132 electronic calculator, which took square roots.
- References:
- W. D. Smith, “Electronic Calculators Gaining,” New York Times, August 7, 1965, p. 25, 27.
- [advertisement], Science, n.s. vol. 151, no. 3708 (21 January 1966), p. 367.
- Mathematics for the Space Age: The Totally New Friden 130 Electronic Calculator, undated advertising booklet.
- An extensive discussion of the development of the Friden 130 is at the Old Calculators Web Museum.
- Location
- Currently not on view
- date made
- 1964
- maker
- Friden, Inc.
- ID Number
- CI.334377
- catalog number
- 334377
- accession number
- 313935
- Data Source
- National Museum of American History
-
Daystrom 046 Mainframe Computer, "Little Gypsy"
- Description
- This section of the Daystrom 046 consists of the multiplexer, logic cabinets, and auxiliary memory. The 046 was manufactured by Daystrom's La Jolla division and was the company's first product utilizing transistors and core memory. Daystrom guaranteed a 99 percent availability, which was demonstrated at Louisiana Power & Light's Sterlington Plant. This 046 is the second purchased by Louisiana Power & Light. It was installed at the Little Gypsy Power Plant in 1961 in LaPlace, La., and was the first computer to control a power plant from startup to shutdown.
- Location
- Currently not on view
- Date made
- 1961
- maker
- Daystrom Incorporated
- ID Number
- 1990.0551.01
- accession number
- 1990.0551
- catalog number
- 1990.0551.01
- Data Source
- National Museum of American History
-
Punch Cards used with a PDP-9 Minicomputer
- Description
- In the mid-1960s, the Computer Science Department at RAND Corporation turned its attention to developing computer graphics. A set of programs written in the programming language FORTRAN for the PDP-9 minicomputer were used to plot contour lines useful in determining the line of sight for microwave radiation emitted from a given point on a map. These cards have the program for a FORTRAN program with non-accession number 1990.3046.10.
- The cards are white with a green, gray or no border on the top. A mark on the first card reads: $1BFTC DPLT. Text in ink on this card reads: Used to plot Fig2.
- Location
- Currently not on view
- date made
- 1968
- maker
- IBM
- ID Number
- 1990.3046.09
- catalog number
- 1990.3046.09
- nonaccession number
- 1990.3046
- Data Source
- National Museum of American History
-
Handheld Electronic Calculator Prototype - Texas Instruments Cal Tech
- Description
- This prototype handheld electronic calculator was built in the Semiconductor Research and Development Laboratory at Texas Instruments in Dallas, Texas, by a team led by Jack Kilby (1923–2005), co-inventor of the integrated circuit. By the mid-1960s, TI was building microchips for industrial and military applications. The company president, Pat Haggerty, sought a consumer product that would use chips, just as earlier TI transistors had found wide use in transistor radios. Haggerty proposed a variety of possible products, and Kilby and his colleagues settled on making a small electronic calculator. TI had given an earlier development program the code name Project MIT. The calculator work, also confidential, was dubbed Project Cal Tech.
- Machines that performed basic arithmetic had sold from the mid-19th century, for use in business and government. Desktop electronic calculators with vacuum tubes sold from 1961, and with transistors from 1964. Kilby envisioned something much smaller that would be roughly the size of a book. This required a smaller keyboard, a new form of display, a portable power supply, and a new memory and central processor. Kilby assigned design of the keyboard to James Van Tassel, and gave work on the memory and processor to Jerry Merryman. He took responsibility for the output and power supply himself.
- By September 1967 Kilby, Merryman, and Van Tassel had made enough progress to apply for a patent. The submitted a revised patent in May 1971 and a further revision in December 1972. This final application received U.S. Patent No. 3,819,921 on June 25, 1974.
- The prototype resembles the “miniature electronic calculator” shown in the patent drawings. It has a metal case painted black and an array of seventeen keys and a zero bar. In addition to nine digit keys, there are keys for a decimal point, four arithmetic functions, clear (C), error (E), and print (P). The on/off switch is at the back right and a thermal printer with a thin strip of paper at the back left. The power supply plugs into the back of the calculator and into the wall.
- An inscription on the front of the calculator reads: THE FIRST CAL TECH (/) PRESENTED TO P. E. HAGGERTY (/) MARCH 29, 1967.
- Depressing a button on the front edge of the machine releases the cover and reveals an intricate “integrated circuit array” (to use the terminology of the patent description) and three chips. The array contained four integrated circuits, each the size of a wafer usually made with several chips on it.
- Further refinement of the Cal Tech led to the commercial Pocketronic calculator, introduced by Canon in Japan in 1970 and in the United States in 1971. Texas Instruments began selling calculators under its own name in 1972.
- References:
- Kathy B. Hamrick, “The History of the Hand-Held Electronic Calculator,” American Mathematical Monthly, 102, October 1996, pp. 633–639.
- Jack Kilby, Oral History with Arthur L. Norberg, June 21, 1984, Charles Babbage Institute, University of Minnesota, Minneapolis, Minnesota. A transcript is available online. Accessed June 18, 2015.
- T. R. Reid, The Chip: How Two Americans Invented the Microchip and Launched a Revolution, New York: Simon & Schuster, 1985.
- Jeffrey Zygmont, Microchip: An Idea, Its Genesis, and the Revolution It Created, Cambridge, MA: Perseus Publishing, 2003.
- date made
- 1967
- maker
- Texas Instruments
- ID Number
- CI.336000
- catalog number
- 336000
- accession number
- 319050
- Data Source
- National Museum of American History
-
Punch Cards used with a PDP-9 Minicomputer
- Description
- In the mid-1960s, the Computer Science Department at RAND Corporation turned its attention to developing computer graphics. A set of programs written in the programming language FORTRAN for the PDP-9 minicomputer were used to plot contour lines useful in determining the line of sight for microwave radiation emitted from a given point on a map. These cards have some of the data for one of these programs. The cards are white with a pink border on the top.
- Groups of cards are numbered from 46 through 63. The program has non-accession number 1990.3046.10. A mark on the top card reads: DATE GENERATED 4-11-68.
- Location
- Currently not on view
- date made
- 1968
- maker
- IBM
- ID Number
- 1990.3046.01
- catalog number
- 1990.3046.01
- nonaccession number
- 1990.3046
- Data Source
- National Museum of American History
-
Keyboard for Green Machine Prototype Electronic Calculator
- Description
- As a graduate student in electrical engineering at the University of California at Berkeley, Thomas E. Osborne began thinking about the design of a desktop electronic calculator suited for calculating the very large and very small numbers encountered in scientific work. In January of 1964, he formed the firm Logic Design, Inc., to develop his ideas. By late 1964, he had built this prototype keyboard and display, as well as a prototype logic unit (1978.0311.02).
- The keys are of plastic, the case of balsa wood painted green. The prototype is known as “the green machine” from the color of the paint.
- The model has an array of nine digit keys on the right front, with zero, decimal point and exp keys above them. On the left are twelve keys for arithmetic operations, clearance, and memory access. After damage to the case, it was reconstructed by Osborne before it came to the Museum.
- For related objects, see 1978.0311.02. For related documentation, see invention notebooks and photographs by Osborne (1978.0311.03 through 1978.0311.14). For purchase orders of components used in the prototype, see 1985.0264.01. Elements of the green machine were incorporated in Hewlett Packard’s first commercial electronic calculator, the HP9100. For a prototype of that machine, see 1978.0311.03.
- References:
- Bernard M. Oliver, “How the Model 9100A Was Developed,” Hewlett-Packard Journal, September, 1968. A copy of this article is at the HP Museum website.
- The website of the University of Wyoming contains biographical information about Osborne.
- Location
- Currently not on view
- date made
- 1964
- date received
- 1978
- maker
- Osborne, Thomas E.
- ID Number
- 1978.0311.01
- catalog number
- 1978.0311.01
- accession number
- 1978.0311
- Data Source
- National Museum of American History
-
Printout from COBOL Program Run at RCA in August 1960
- Description
- This is one of the first successful printouts of a program written in the computer programming language COBOL. After COBOL was proposed and described in 1959, programmers at Remington Rand Univac and at RCA wrote compilers that translated COBOL commands into machine language. They also wrote test programs to demonstrate the language. Like later COBOL programs , this one was divided into four sections.
- The first identified the program and gave the name of the programmer. The second section, called the environment division, presented information about the specific machine used, such as the computer model, and locations to be used for different files. The third, or procedure, division was independent of the computer. It gave a series of statements about what the machine was to do. Although commands resemble ordinary English, the words used had very specific definitions and equations could be written using mathematical symbols. Finally, the data division defined the information to be processed. This data was entered so that it could be used in several programs, as in later database management systems. Successfully compiling a program produced a printout with each of these sections, as well as a listing of the desired results.
- This printout of the first successful COBOL compilation at RCA relates to inventory control. One page is marked in ink: Good output – 8/17/60 (/) (isn’t it beautiful) (/) not really [the not really is crossed out] (/) well almost.
- Location
- Currently not on view
- date made
- 1960
- maker
- RCA Corporation
- ID Number
- 2010.3050.1
- catalog number
- 2010.3050.1
- nonaccession number
- 2010.3050
- Data Source
- National Museum of American History
-
Slide Rule, Minimum Latency Calculator for the UNIVAC Solid-State Computer
- Description
- This circular device was an aid to programming the UNIVAC solid-state computer. It consists of a paper disc with equal divisions running from 1 to 200 near the edge, and a clear plastic rotating disc that are pivoted together at the center. The upper disc is marked in red with two perpendicular diameters. The solid state computer had a magnetic storage drum on which locations were specified numerically. The latency calculator allowed programmers to write code for the machine to make the most efficient possible use of the drum memory. The back of the instrument gives a list of instruction codes and corresponding word times. Recieved in bag. Reference: Sperry Rand Corporation, Programming: Simple Transition to Electronic Processing UNIVAC Solid-State 80, 18-26.
- Compare 2005.0271.01. Date based on date of documents 2015.3097.03 and 2015.3097.04.
- According to Kirk Lubbes, who programmed the Univac Solid State Computer:
- "The SS90 had a drum memory, i.e. memory was not random accessible. One had slow memory and fast memory. The slow memory had only a single read/write head per track on the drum and fast memory had four read/write heads spaced at 90 degrees, so therefore the drum had to rotate a full revolution to access a memory word in slow memory and only a quarter turn to access fast memory.
- The trick in programming the SS90 was to have the instruction and its operand accessible at an optimal time so that the instruction could access its operand without waiting for the drum very far. As one started a program, this was not much a problem. The programmer new how much time that a given instruction would take to execute and the speed of the drum. Therefore, he calculated the position of the next instruction, based these two parameters. The minimum latency calculator was a mechanical device to help in this calculation. The problem was that as the programmer progressed, collisions occurred, i.e. the optimal location of an instruction or an operand was already taken by a previous instruction or operand. Since the drum was arranged in bands and the read/write heads were at the same location on each band, if one had a collision, you could put the necessary instruction or operand in a parallel band at the same position. This worked the bands all filled up.
- The basic approach was to get a program working using the best latency that you could. Then the programmer would go back and start rearranging instructions and operand locations to achieve minimum latency. In those early times, machine time was expensive and memory severely limited. So it was important that production programs were efficient."
- Reference:
- Nonccession file 2015.3097.
- Location
- Currently not on view
- date made
- ca 1960
- maker
- Remington Rand Univac
- ID Number
- 2015.3097.01
- nonaccession number
- 2015.3097
- catalog number
- 2015.3097.01
- Data Source
- National Museum of American History
-
Punch Cards used with a PDP-9 Minicomputer
- Description
- In the mid-1960s, the Computer Science Department at RAND Corporation turned its attention to developing computer graphics. A set of programs written in the programming language FORTRAN for the PDP-9 minicomputer were used to plot contour lines useful in determining the line of sight for microwave radiation emitted from a given point on a map. These cards have some of the data for one of these programs. The cards are white with a pink border on the top (occasional cards have a green border). A mark on the first card reads: 7 3000 500.
- A related program has non-accession number 1990.3046.10.
- Location
- Currently not on view
- date made
- 1968
- maker
- IBM
- ID Number
- 1990.3046.04
- catalog number
- 1990.3046.04
- nonaccession number
- 1990.3046
- Data Source
- National Museum of American History
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