ER DIGITAL COMPUTER _ vvpsea of tlhle newsletter' tdei dl J1uorntarth •' ele SNEWSL ETT ERt OFFICE OF NAVAL RESEARCH • MATHEMATICAL SCIENCES DIVISION TABLE OF CONTENTS i COMPUTERS 1 2 3 4 October 1956 Editor Albrecht J Neumann Vol 8 No 4 Page No U S A Air Force Armament Center ARDC Eglin AFB Florida Arnold Engineering Development Center Bureau of Ships Electronic Computer Division Digital Computer Differential Analyzer Combination Bendix Computer ' Division 5 6 7 8 9 10 11 12 13 14 15 1 I 3 First SAGE Computer Installed LARC Livermore Atomic Research Computer Naval Air Test Center Naval Air Station Patuxent River Maryland Naval Proving Ground Dahlgren Virginia PENNSTAC Pennsylvania State University RAYDAC Naval Missile Test Center Point Mugu California Stock Exchange Automation Toronto Canada Sylvania Data Processing System Unveiled Univac Scientific 1103A Universal Digital Operational Flight Trainer Moore School U of Pennsylvania WHIRLWIND I for April May and June 1956 3 5 6 7 7 8 8 8 9 9 10 11 COMPUTING CENTERS 1 2 3 4 5 Georgia Institute of Technology Rich Electronic Computer Center University of Houston Computing and Data Processing Center The Institute for Advanced Study Electronic Computer Project MURA Midwestern Universities Research Association Madison Wisconsin ORACLE Applications Program 12 13 13 14 14 COMPUTERS OVERSEAS 1 2 3 4 Centro Studi Calcolatrici Elettroniche C S C E Pisa Italy DEUCE The English Electric Co Ltd Stafford England Elliott Brothers London Limited European Univac Center D f COMPONENTS UFli 1 CARDATRON Punched Card Input-Output System 2 DATATRON Floating Point Control Unit 15 15 16 D' n - 16 l- OCT 1 61969 MISCELLANEOUS B Approved by The Under Secretary of the Navy 16 August 1954 C LEA R I N GH U 1 1 L • - i - NAVEXOS P-45 - - - ' -- TC FLRNTTEED TO DTD A SV2 N jTrA NT NTUMB ER CCONTO OF CONTAINED DOCUM4ENT HAVE PAGES THAT BLANK FROM REPRODUCED REPROUCEDFROMTHIS BEST AVAILABLE COPY BEEN DELETED COMPUTERS U S A AIR FORCE ARMAMENT CENTER ARDC EGLIN AFB FLORIDA Delivery of the UNIVAC High Speed Printer to be used with the existing UNIVAC Scientific Computer System is expected in October 1956 This printer will be capable of on-line or offline operation In the off-line mode a Uniservo Magnetic Tape Unit prepared'by the computer will drive the printer See also DCN April 1956 issue In mid-June the computer operation was extended to a second shift bringing the utilization of the machine to approximately 90 hours per week This increase in time was necessary to meet the computational requirements of an increasing test project workload and the transfer of responsibility for preparation of bombing tables from Aberdeen Proving Ground to the Air Force Armament Center A study was initiated to devise an improved compiling routine for the UNIVAC Scientific Computer based on the present compile-interpreter I i The following additional features are being planned 1 Ability to compile a subroutine with or without execution on programmer's option 2 Ability to handle subroutines with multiple entries 3 In order to provide for programs whose length exceed Electrostatic Storage the ability to segment a program on command saving previous segments in auxiliary memory drum or tape and a record of how such segments were made and stored 4 Ability to prepare another region of ES which would remain invariant between segments 5 Built in provision for other interpretive coding systems such as FLIP ON-LINE DATA REDUCTION TUNNEL E-l GAS DYNAMICS FACILITY ARNOLD ENGINEERING DEVELOPMENT CENTER The first application of on-line data reduction at GDF occurred in September 1955 when a heat transfer developmental problem was investigated for an outside contractor Since that time the on-line system has been used practically full time for tests run in Tunnel E-1 which is the GDF tunnel now operating full time The term on-line signifies that the test data is fed directly from test instruments into a computer without any manual operation except the depression of a take-data button This system has reduced the presentation time to a few seconds after the completion of a test An on-line system includes the sensing of the parameters conversion to the equivalent digital value accumulation in a digital computer computations on the data and the presentation of the calculated data as decimal tabulations or X-Y plots Most input instruments are digitized by means of Coleman rotation to binary converters For pressure measurements the Wianoko system is used which is monitored by digitized millivolt indicators or recorders and a digitized automatic readout electromanometer manufactured by Consolidated Electrodynamic Corporation This is a servo-type system which is accurate and repeatable to 0 1 percent of full scale The link between the test instruments and the computer is the scanner which sequences the instrument outputs to the computer input A total of 252-scanner input positions are available with each position being read once during a scan cycle The maximum scanning rate is 20 positions per second thus approximately 12 5 seconds are required to enter 252 channels of data into the computer The data is entered into the computer in any desired order which is du termined by connections or plugboards located in the lower portion of the scanner Also the - 1- scanner may he tonnected to o van sit or at oroup of poetilono ovei' annd over allain until manually stopped by the operator or control system This is iinvinitrart to the normal operationin whieh the scanner aulomativally elope alte it has ovannod the posltions emlieted om tho pluxbmArdN The BRA 1101 at general-purpose digital vemputer Is u•ed for on-line operation with theses tunnels The word sioe for Internal tcompulor operatiomi in 94 bite which is equivalent to 7 decimal digits Word sins of Inputs front on-line instrumontatlon is itt b1ts which Is equivalent te 4 decimal digits plum sign The toot date arrives from the scanner in the form of 15-bit binary numbers Those numbers representing pressures temperatures forces manual inputs and so forth are temporarily stored in the data itput registor and punehed on paper tape During on-line operation the computer monitor@ the data input register using the test inrormatiun ae required In the prtblein solution The three types of output devices presently being used with the digital computer are eloetric typewriters a high-speed punch and X-Y point plotters Any of the computed data may be tabulated on the typewriters or punched on tape and any two quantities may serve as coordinates for plotting curves At present a maximum of five typewriters one punch and four plotters may be used simultaneously with the computer 04e of the basic concepts considered in designing the control system was simplicity of op eration particularly for personnel operating the tunnel Consequently they were provided with ta • -data and end-data buttons depressing these control buttons in the only manually initiated function required to start and complete a teat run It is interesting at this point to make a comparison between the present on-line method and the methods previously used which consisted of marking strip-chart recorders doing the calculation with desk calculators and tabulating and plotting the results Measuring Recording 74 pointo Calculating Tabulating On-Line Manual 86 seconds 2-3 4 minutes 20 minutes I hour 20 minutes Time studies have shown that a calibration test that formerly took three to four weeks to complete can be done with the on-line method in one week Besides this saving of time a more accurate calibration is obtained It Is necessary when using an on-line system to program the computer before the test starts This operation takes times which was not shown in the above figures however it can be done while another test is in progress and therefore does not utilize wind-tunnel test time Some times calibration curves and constants are not known until shortly before the test begins however these parts of the program can be left open and added at the last minute This is accomplished by inserting them manually into the compiter and having the computer punch out its complete program on a high speed teletype punch In case the computer is employed on other computing work it is possible to record only In this operation the raw data is punched on paper tape and later fed into the computer for computation and tabulation similar to the semi-automatic on-line method of data reduction mentioned earlier Timec involved in the present on-line system conilsts chiefly of tabulating time This time can be substantially reduced by tabulating on more than one machine simultaneously However this method has the disadvantage of splitting the tabulated data into as many sheets as there are tabulators It is usually more convenient to present final data bn a single sheet Proven high-speed printout devices will substantially reduce this printout time -2- BURKLAU OF SHIPS ELECTRONIC COMPUTER DIVISION Plans have been completed and programming hao been started to mechanise the Comptroller Division appropriation acRcounting operations of the Bureau of Ships through the use of large scale electronic prrcessing equipment This In a long range project and embraces one of the largest areas of application that ham been attempted in the Bureau in the field of data processing The Univac computer at the David Taylor Model Basin will be used to test out each phase of the overall problem and aid in a final determination of the ultimate equipment and techniques requit od to procesm this type of work most efficiently The second Univac 1 which the Bureau is renting is now installed and operating at the Applied Mathematics Laboratory David Taylor Model Basin This computer is being used on a full three shift schedule for nuclear reactor designs The computer will be exchanged for a Univac U as soon as one is available before the end of Fiscal Year 1957 The nuclear reactor comp ting load remaIns so large that the equivalent of more than one Univac time to being obtained on other Univace throughout the country in addition to one hundred hours per month obtained on the high speed NORC computer at Dahlgrmn Virginia A contract has been signed with the Sperry-Rand Corporation requix in the delivery of a LARC computer to the Applied Mathematics Laboratory at the David Taylor Model Basin by December 1958 DIGITAL COMPUTER AND DIFFERENTIAL ANALYZER COMBINATION BENDIX COMPUTER DIVISION The Bendix Computer Division has recently announced the development of a general purpose digital computer and digital differential analyzer system which provides versatility for solving complex technical problems in the easiest most economical way A full complement of input-output equipmont is available Delivery of the first production models will be made this October Specifications on the G- 15D general purpose computer which forms part of the computer system wero given in theApril 1956 Digital Computer Newsletter Input-output equipment specificatons are as follows INPUT AND OUTPUT EQUIPMENT Type Typewriter Paper Tape Paper Tape PTP-1 Magnetic Tape Card Graph Plotter Graph Follower Input Speed Manual operation 200 char sec average 430 char sec 17 char sec in 0 01 inch increments Output Speed 10 char sec 17 char sec 60 char sec 430 char sec 11 char sec 0 01 inch increments at 20 increments sec included in basic price of G 15 DESCRIPTION OF ACCESSORY EQUIPMENT MTA-2 Magnetic Tape Unit For auxiliary storage up to 4 MTA-2 Magnetic Tape units may be connected to a G-15D Each unit will store up to 300 000 woros on standard 1 2 inch magnetic tape on 10- 1 2 inch NARTB reels Tape may be searched for either blocks of up to 108 words or for fit secticns consisting of any arbitrary number of blocks Read-write speed is 7 5 inches per second Search speed is 45 Inches per second -3 - DA-I DIGITAL DIFFEREN'IAL ANALYZER Thip accessory establishes the digital differential analymer features in the G-iBD System 'Ite result Is a system performance similar to the Bendix D-12 Digital Differential Analyzer Irk ddition to the general purpose actions Through the DA-I use is nmtade of the magnetic memory drum of the 0-15D to form 108 integrators and 108 constant multipliers Operation speed is 34 Iterations per second AN-i ALPHANUMERIC PAPER TAPE INPUT-OUTPUT ACCESSORY t The N-l accessory r-er • alnhanumeric onnnr tape input in any code and enter it directly Into the computer's memory After setting melector uwitches on Uic AN-1 a bpociai converalon routine may be used to translate the original input into the internal langua e of the O-i5D After computation output is reconverted to the original code and punched out by the PTP 1 Tape Punch that is part of the AN-I Conversion can be accomplished on any code that cai be placed on paper tape in 5-hole code AN-2 ALPHANUMERIC PAPER TAPE INPUT-OUTPUT ACCESSORY Same as above except punch is 7-hole to accommodate 6 or 7-hole codes Eight-hole codes can be used but punch must be supplied by purchaser PTP-1 HIGH SPEED PAPER TAPE PUNCH This device will increase the output punching speed of ie computer to 60 characters per second It is available in a 5-hole code model for use directly with the standard G-15D or when purchased as part of the AN- I Alphanumeric Input-Output Accessory in models that punch up to 7 holes CA-1 PUNCHED CARD ACCESSORY With the Model CA-1 Punched Card Accessory serial punch card equipment can b coupled through a plug connector to the G-15D Computer The maximum reading speed for cards with one column of information is 44 cards per minute while fully punched cards are read at the rate of 12 cards per minute PA-i GRAPH PLOTTER AND PFA-I GRAPH PLOTTER FOLLOWER Two graphical devices capable of receiving and emitting incremental information representative of functions are available for use with the DA- 1 Thnse are the incremental Graph Plotter Model PA-1 and the incremental Graph Plotter Follower Model PFA-I Any two of these devices may be used at one time The Plotter Follower or the Plotter may be used to draw a graph showing the relationship between any two variables generated by the computer in 0 01 inch idcrements on paper up to 12 Inchee by 18 inches Normal plotting speed_ is 20 I•ncrements per second The Plotter Follower when used as a curve follower has one axis driven in 0 01 inch increments corresponding to any variable generated by the computer and enters into the computer increments of the functional variable of the graph on the follower The Follower is a photoelectric device capable of following dark pencil or ink lines on light paper A supplementary programming system INTERCOM 101 has been developed for those not trained in the use of any computer It is a quick efficient method for the programming of short-run problems This system makes use of the G-15 as a single address decimal floatir g point computer with B registers Its command list contains 31 orders and 18 instructions that call up subroutines written in standard G-15 language Although designed as a supplementary programming system it is being effectively used for major programs such as data reductions for turbo jets and a program to determine complex roots of real polynomials Recent up-time figures of one customer's G-15A installation show 110 hours of continuous 24 hour per day error-free operation with unattended operation during the night -4 - 0 Paul Staderman has been appointed head of the newly organised marketing division Expansion program for this department has to this date established regional offices in Washington D C wider Robert A Sweet and Dalla#n Texas under Richard F Wals Canadian representative is now Computing Devices of Canada Ottawa Ontario Dr Harry Huskey of the University of California and the Bendix Computer D 1 nonducted a course in Advanced Programming Tochriqu o a at the Wayne University Computation Laboratory summer program Laboratory equipment for the workshop sessions included the Bendix 0 15A Facilities for the Computer Division have been increased by the addition of a manufacturing plant in El Segundo California and Customer Training classrooms and offices and Cust blnrla C11ce InUN a-urn• California Remodeling of the main plant in Los Angeles is in progress to accommodate administrative and marketing personnel with gr•nmd to be brokon soon for the engineering research and development building which will double the Computer Division facilities FIRST SAGE COMPUTER INSTALLED The first large-scale computer for the nation's vast new electronic air warning network known as the Semi-Automatic Ground Environment SAGE system has been set up at the McGuire Air Force Base in New Jersey This computer fits into the integrated complex of radar ships jet aircraft communications networks missiles and people that is rapidly taking shape as the continental air defense system It combines the ability of digital electronic computers to receive information to memorize to calculate and to record answers in order to present an instantaneous graphic picture of the location speed and direction of all planes within radar range With a knowledge of flight plans of friendly planes available in the computer hostile planes can be identified immediately and the most effective defense action taken-again on the basis of computer Information and Instruction The Military chusetts Military computer was designed by the International Businesei Machines Corporation at its Products Division Laboratory Poughkeepsie N Y in cooperation with the MassaInstitute of Technology Lincoln Laboratory and was manufactured at the Kingston Products Division plant of IBM Information about aircraft anywhere within the radar area is relayed continuously and automatically to the computer by telephone line or UHF radio link The computer called the AN FSQ-7 dizests all of this information plus Ground Observer reports flight plans and weather information as fast as it is received and translates it into an overall picture of the air situation These TV-like pictures show the air battle as it develops and provide the basis for the necessary human judgments The computer automatically calculates for the operator the most effective employment of such defensive weapons as guided missiles antiaircraft batteries and jet interceptors In the case of the intercepting jets the aircraft is controlled by directions fed by radio directly from the computer to the automatic pilot in the plane Missiles are controlled similarly At any time the air battle commander can have the computer display the overall air situation or whatever part of it he wishes to monitor in detail As the battle moves information Is transferred spontaneously to an adjacent computer The AN FSQ-7 is designed to operate 24 hours a day 7 days a week Facilities are provided so that preventive maintenance can be performed on the machine while SAGE data continues to be processed The equipment going to McGuire is the first production computer Engineering models of the computer have been installed for several months at Kingston and at the Lincoln Laboratory of Massachusetts Institute of Technology in Lexington Mass where the system is being tested -5- LARC LIVERMORE ATOMIC RESEARCH COMPUTER The LARC deriving its name from the first system being built for the University of California Radiation Laboratory Livermore Site and hence called Livermore Atomic Research 'Cumputer is a large-scale high-speed digital computer system being built by the Remington lvid Univac Division of Sperry Rand Corporation This computer system is a general purpose computer to solve varied and extensive problems in the fields of science and engineering It utilizes solid-state circuitry modular construction overlapping of execution of instructions automatic error-correction and a large memory to provide improved speed flexibility expansibility and easier maintenance The basic computer system contains two stored program computers One is an inputoutput processor designed primarily to provide flexible parallel and coordinated control of the input-output equipment and the auxiliary drum file memory See Chart I The second is a a• -oned to perform the arithmetic functions of the system in both fixedparallel compu ' ng and floating-point arithmetic operation Except for certain intercommunication facilities the computing unit and the input-output processor operate independently and can carry out their programs simultaneously For situations requiring more computing capacity or dual problem handling a second computing unit can be added to the system A high-speed magnetic core memory is shared by the processor and computing units The memory is divided into units each capable of storing 2500 computer words of 11 decimal digits plus a sign digit The high-speed memory may be expanded to a maximum of 39 units which is the equivalent of 97 500 words These memory units are equipped with separate memory switches and may be addressed by different units in parallel for near- simultaneous service thus yielding an effective memory cycle of two or less microseconds The high-speed memory is backed up by a magnetic drum file memory Up to 24 magnetic drums may be included in the system Each drum is capable of storing 250 000 computer words of 12 decimal digits The magnetic drums feature a new and tested air-floated readwrite head assembly which achieves a new order of reliability with higher pulse densities because of the absence of mechanical contact between the head and the drum surface The system includes both an operator's console and an engineering control console The input-output terminal equipment can include a wide variety of units as follows CHART I UNIVAC II - Type Magnetic Tape Units UNYSERVO's High-Speed Printer Head Keyboard and Typewriter Printers on Consoles Optional Charactron Display and Photographic Recorder Unit Optional Card Reader Optional Off -Line Equipment for Tajpe-to-Card Tape-to-Printed Sheet and Magnetic Tape-toPunched Tape Conversions All of these units and the drum file are under the direct control of the processor The inclusion of 8 high-speed index registers and 18 high-speed arithmetic registers together with 4 control counter registers and 3 instruction registers reduces data interference and permits flexible programming for real-time overlapping of instructions The number of high-speed registers can be increased to a total of 100 With an overlapping of execution of instructions typical machine speeds can be represented by the following instructions -6- Floating Point Add Multiply Divide 4 microseconds 8 microseconds 28-32 microseconds These execution times are all-inclusive Including memory access etc Enough checking circuits are included in the system to ensure an extremely low probability of undetected errors Error detection circuits supply sufficient information to enable the computer to correct single errors without operator intervention The procetsor is a specialized stored program computer which frees the computing units of all input-output functions thus the computing unit can concentrate upon the arithmetic functions for which it is especially adapted The processor gives flexibility in the choice of the size of the memory area to be filled or emptied and the input-outptit aevice to be used with ounly limited need fur separate high-costper-digit inflexible buffer storage units A typical installation comprises one processor eight core memory units twelve drum files four tape units one computing unit an operator's console and an engineer's console NAVAL AIR TEST CENTER NAVAL AIR STATION PATUXENT RIVER MARYLAND Delivery of one Magnetic Tape Control Unit and one Magnetic Transport Unit for use with the Datatron 204 Computer will be made in September The addition of these units will add an auxiliary iietxiory capacity of 400 000 computer words The Datatron 204 Computer continues to operate on a single 8 5 hour shift with overtime as required The operating statistics for the three calendar months ending 30 July are as follows Useful Time Down Time Total Time May Hours % June Hours % July Hours % 193 5 14 6 208 1 174 7 6 2 180 9 96 6 3 4 100 0 176 2 9 5 185 7 94 9 5 1 i00 0 53 9 12 5 2 3 11 6 16 3 96 6 18 6 107 8 0 4 22 3 27 1 176 2 10 0 58 1 0 2 12 0 14 6 94 9 93 0 7 0 100 0 Breakdown of Useful Time Code Checking Production Computing Demonstrations SLheduled Preventive Maintenance Idle Total 90 6 26 3 4 6 27 5 44 5 193 5 97 5 22 6 4 1 21 0 29 5 174 7 43 6 12 6 2 2 13 2 21 4 93 0 Mr R A Sweet who was instrumental in the formation of the NATC Digital Computer Facility has resigned from government service and is presently connected with the Bendix Computer Division Mr Sylvan H Chasen has been selected to head the Computer Facility and will be assisted by Mr William A Kelley NAVAL PROVING GROUND DAHLGREN VIRGINIA Luring the first half of 1956 the good operating time of the Naval Ordnance Research Calculator NORC averaged 88 percent of scheduled operating time A new and larger 40 ton cooling system for the main frame of the calculator was installed to eliminate the frequent breakdowns which the original system experienced Several minor -7- logical changes have been accomplished including the addition of a now order which provides for the extraction of selected groups of digits from words The ARC and ADEC are available for use as needed on a one-shift schedule PENNSTAC PENNSYLVANIA STATE UNIVERSITY PENNSTAC was completed on July 1 1956 after being under construction for approximately two and one-half years It was built almost entirely by students and University faculty The machine is being used for scientific computation related to sponsored research for approximately one-half of the time while the other thalf of its computation time is devoted to educational use either directly in formal class work or graduate thesis computation The machine has not been in operation long enough to gather any operating statistics RAYDAC NAVAL MISSILE TEST CENTER PT MUGU CALIFORNIA The addition of a second high speed mercury delay line memory to RAYDAC has been completed This addition has increased the internal storage capacity of RAYDAC from 1 024 to 2 048 words with an average random access time of 150 microseconds and an access time of 10 microseconds with forced coding Considerable progress has been made in the design and fabrication of high-speed inputoutput equipment for RAYDAC A Clary line printer has been obtained to replace the directly connected teletype printer now in use This replacement will make it possible to print out the contents of the internal storage via the directly connected Clary printer because of its slow print out time During the solution of problems on RAYDAC results are recorded on magnetic tape located on one of the four external memory units The magnetic tape is removed from the external memory unit and placed on output equipment to obtain a tabular listing In order to do away with the manual changing of tapes a facility has been added for electrically interchanging the external memory units and output equipment RAYDAC computing services are available for the solution of problems originating at other Government activities and with prime contractors to the Department of Defense These services may be obtained by contacting the Bureau of Aeronautics Code EL-733 The western operations of Computer Control Co Inc which operates and maintains the RAYDAC are now under the direction of G G Crissman Mr Crissman assumed this position after his retirement from the Navy in July STOCK EXCHANGE AUTOMATION TORONTO CANADA The Toronto Stock Exchange has become the first stock and commodity market in the world to be electronically automated ' The Teleregister Corporation a subsidiary of the Ogden Corporation maintains the automatic electric stock quotation boards in the brokerage offices in this country and designed and built the new system for tho Toronto Stocit Exchange The new system is an outgrowth of the Exchange's Diul Service which has been In opera- tion since 1947 and which provides brokers with bit %sked prices on listed stocks However in order to obtain prices under the dial system it is necessary for the brcker to dial R code number in order to receive a printed quotation on a given stock with a separate dialing necessary for each quotatlon requested The new system provides brokerage offices with a display panel which instantaneously and automatically displays latest bid and asked prices on any 50 stocks the broker may ielect As each quotation is recorded from the Exchange floor an Exchange operator punches it up on a keyboard which transfers the price to a rotating magnetic drum which is located in the Exchange -8 - building The prices are sent out automat cally by direct wires to all subscribers offices and at the same time they instantaneously appear on the display panels The new service was ordered last year by the Toronto Stock Exchange to enable its members to cope with the phenomenal volume of recent markets which had ranged to a high of 13-1 2 million sha'es i a single session This trading far exceeds even that of the New York Stock Exchange or any of the Continental exchanges Toronto's 1955 trading of 1 6 billion shares more than doubled its 1954 record and 1956 figures are heading for a new peak While the dial system normally responds in about 3 seconds on heavy trading days it sometimes takes up to 50 seconds With the advent of the Display System the demand on the dial system which is now about 50 000 calls per day will be greatly reduced and consequently the latter will respond more rapidly Teleregister's network of electro-mechanical stock and commodity quotation boards in the United States has grown into a system which includes at present 400 boards in 46 cities Toronto's original Bid Asked Dial System was recently equipped with an electronically operated magnetic drum memory using techniques developed by Teleregitter in the field of special purpose digital computers Similar systems are now used by America's leading airlines Teleregister has built or is building such systemn for American Airlines United Airlines Pan American World Airways Braniff International Airways and National Airlines The New York Central the Santa Fe and the New Haven Railroads wIll soon have automatic reservation systems in service These three systems will be inter-connected to form a coastto-coast network allowing even inter-line reservations to be made quickly These systems will store all train reservations inventories for seven months in advance SYLVANIA DATA PROCESSING SYSTEM UNVEILED The unveiling of a nationwide 18 000-mile private communication network and data processing system at Sylvania Electric Products Inc Camillus N Y on June 26 marked a revolutionary step in the application of automation and electronicG to industry The focal point of the system is the new Data Processing Center at Camillus where P Univac computer receives and processes data transmitted over a network of 71 Sylvania plants and offices Connected to the Center by a leased Western Union network these Sylvania facilities are located in 61 cities and towns in 20 states The specialized communications facilities link Sylvania's 45 plants 19 laboratories 27 sales offices 17 warehouses 10 divisional headquarters and executive offices These installations feed financial and production information via the Western Union network to the Data Processing Center At the center the large digital computer and subsidiary electronic equipment quickly converts the information into summarized data on which can be btsed decisions at the corporate divisional or plant leel The centralization of Sylvania's data processing functions- incltding the gathering recording computing and classifying of a great variety of information concerning volume sales billing and many other types of business activities-was made necessary by the company's rapid expansion in many diversified fields Expanding plant and laboratory operations enlarged distribution and continually broadening markets make high-speed processing of operating data a necessary tool for efficient operation of the organization UNIVAC SCIENTIFIC 1103A This inonth the Univac Scientific Model 1103A the first in a new series of Remington Rand Univac Computers goes into operation in the computing center at Lockheed's Missiles Systems Division in Palo Alto California -9 Up to three magnetic-core units of 4096 words storage each may be incorporated in the Univac Scientific 1103A in addition to the 16 384 words of magnetic drum storage The Uniservo magnetic tape storage units will each store as many as 384 000 words and up to ten may be used to provide total storage of nearly four million words The computer will be applied to problems encountered in missile research and development Because flight can be simulated with the Univac Scientific computing system much valuable time will be saved in the missiles program Ten Univac Scientifics have been installed at various Defense department agencies Other users include Georgia Institute of Technology Convair National Advisory Committee for Aeronautics Westinghouse Johns Hopkins University and Ramo-Wooldridge A Model 1103 has been in use at the Remington Rand Univac plant in St Paul Minnesota since last February A new program has been designed to expedite the preparation of instructions for the Univac Scientific Computer by interpreting a language which is natural to the non-professional programmer A user of the system may set down his problem in normal algebraic expressions and include statements regarding the manipulation of such expressions There is now available to Univac Scientific 1103 users and service bureau customers a program for multiple correlation regression analysis The program will handle up to 30 variables and up to 400 observations on each variable The program is designed to make good use of the great facility of the Univac Scientific for this type of computation hence it is very flexible economical and extremely fast The program will complete an analysis including input-output for the maximum case of 30 variables and 400 observations in as little as 9 minutes Several analyses of Variance routines are currently being developed for the Univac Scientific Computer A current routine provides for an analysis of 3 factors with up to 10 levels and virtually infinite replications Work has begun on a 5-factor 7-level analysis routine These routires are designed for card paper tape or magnetic tape input nf 4 decimal digit datum Service Bureau work is now being handled on the Univac Scientific 1103 computer at Remington Rand Univac St Paul Minnesota The bureau is newly formed and is expanding its activities rapidly In December 1955 the users of the Univac Scientific 1103A computer System formed a cooperative organization known as USE - Univac Scientific Exchange A working draft of a linear programming routine for the Univac Scientific 1103 is now in operation The routine finds a basic set of values of the variables in a linear form which maximize or minimize the value of that linear form subject to a set of linear restraints The method followed is the Alternate Algorithm of the Revised Simplex Method of Da ntzig Zero suppression is used throughout for maximum efficiency of routine operation The routine will handle a system of up to 106 restraints and up to 257 variables The total computer time including input-output for a system of 63 restraints and 88 variables is approximately 15 minutes UNIVERSAL DIGITAL OPERATIONAL FLIGHT TRAINER MOORE SCHOOL UNIVERSITY OF PENNSYLVANIA A contract has been let by the Navy Training Device Center Office of Naval Research to Sylvania Electric Products Inc for construction of the Universal Digital Operational Flight Trainer UDOFT to the design specifications of the Moore School of Electrical Engineering The contract calls for construction of the complete UDOFT including all the cockpit equipment of 2 specified airplanes The UDOFT system consists of the ultra high-speed sequentialparallel digital computer analog-digital conversion equipment instrumentation and digital and analog recording devices Work is continuing on the improvement of digital flight trainers The basib for the use of stability charts has been extended to include eyact prediction of numerical solution of linear - 10 - L systems with forcing functions A systematic procedure for programming UDOFT for any airplane isbeing developed Two new families of transistor switching circuits have been developed with potential application to both digital computers and telephone switching offices One family uses both pnp and npn transistors its main attraction is that it permits design of systems with relatively low standby current WHIRLWIND I FOR APRIL MAY AND JUNE 1956 Applications During the past 3 months the Scientific and Engineering Computations Group in conjunction with various departments at MIT processed 95 problems for solution on Whirlwind I The problems are described in the Project Whirlwind Summary Reports submitted to the Office of Naval Research and cover some 20 different fields of applications The results of 32 of the problems have been or will be included in academic theses In these 32 problems there are represented 25 doctoral theses 3 Naval Engineer's 5 master's and 4 bachelor's Twenty-six of the problems have originated from research project sponsored at MIT by the Office of Naval Research Academic There are a number of graduate subjects in automatic computation numerical analysis and now electronic data processing offered at MIT The following is a table of subjects directly related to machine computation The number of students is a total of the enrollmenL for both fall and spring terms Course Description Year Instructor r of Students 2 215 lftethods of Engineering Analysis G S H Crandall 6 25 Machine-aided Analysis 4 W K Linvill 6 535 Digital Computer Coding and Logic G D N Arden 97 6 538 Electronic Computational Laboratory G F M Verzuh 26 6 54 Pulsed-Data Systems G W K Linvill 60 6 567 Switching Circuits G S H Caldwell 48 6 568 Switching Circuits G S H Caldwell 30 15 542 Management Information Systems G R H Gregory 22 M 39 M 411 Methods of Applied Mathematics Numerical Analysis G G F B Hildebrand F B Hildebrand 253 45 M 412 Numerical Analybis G F B Hildebrand 16 18 153 Systems Since 1954 the MIT Servomechanisms Laboratory has been using the WWI manual intervention and display equipment In the development of high-speed data reduction techniques In order for them to expand their research into computer applications it was essential that more versatile manual inputs be made available on the WWI computer Besides requiring additional on-off switches many of the new programs will be so complex and will require so many parameters that the only reliable way to instruct them will be to use specially designed mnemonic - ii- languages and translation programs In order to have this general language structure available on a manual intervention basis it is necessary to have a keyboard such as a Flexowriter for direct input to the computer The MIT Scientific and Engineering Computations Group have contemplated the following applications for the new facility 1 Demonstration programs would be a great deal more effective if this form of input were available for control purposes 2 Typewriter input for Comprehensive System Flexowriter and post mortem request tapes Short program modifications and Post Mortem requests can presently be inserted in the insertion registers However errors are easily made because the required vocabulary is awkward A typewriter input facility would make available a normal mnemonic vocabulary for such purposes 3 Experimental use of a typewriter facility for direct operator control of the computer Here we would consider using the typewriter to replace the button-pushings required of the operator during normal operations Vocabulary similar to that of Director tapes and performance requests would be devised for these purposes This could easily prove to be an extremely convenient and efficient method of computer operation The new input installation will be available for use by 4 July 1956 Much of the information to be inserted via the keyboard will be the same as is now introduced via a free running photoelectric tape reader using punched paper tapes The keyboard input will also be treated as a free running device i e selection of the facility by the computer may be followed by an arbitrary number of read instructions each of which reads the next character which has been struck on the keyboard The total equipment requirements amount to 15 relays and 20 tubes WWI RELIABILITY 9 March - 31 May 1956 The following is the WWI Computer Reliability for the past quarter Total Computer Operating Time in Hours 1915 Total Time Lost in Hours 24 3 Percentage Operating Time Usable 98 7 Average Uninterrupted Operating Time Between Failure Incidents in Hours Total Number of Failure Incidents Failure Incidents per 24-Hour Day Average Lost Time Per Incident in Minutes Average Preventive Maintenance Time per Day in Hours 28 6 66 1 2 22 1 8 COMPUTING CENTERS GEORGIA INSTITUTE OF TECHNOLOGY RICH ELECTRONIC COMPUTER CENTER An IBM 650 Magnetic Drum Data-Processing System was installed on June 1 1956 at the Rich Electronic Computer Center Georgia Institute of Technology and has been in successful oper•tiion since that date The facilities of the Rich Electronic Computer Center therefore now -12- include Iwo mashines ainse the UNIVAC ICIENTIFIC ERA 1101 Computer has been In itimralt n since August 1955 The Rich Electrokic Computor Center joined the U I Bureau of Public Roado the Southeastern Assooiation of State Highway Officials and the Georgia State Highway Department in sponsoring a Conference on Inereasing Highway Engineering Productivity which wal held at Ueorgla Twih on July 9 10 11 195d Over 150 persons from twenty otatos the District of Columbia and Puerto Rico attended the sesilons Special emphasis was placed ou the applie'alions of electronic digital computers to highway location design and construction Including traffic studies and bridge design Demonstrations of problem solving in these fields were given on the Computer Center's machines as well as on the Univac 130 and the Librasecope LOP-SO UNIVERSITY OF HOUSTON COMPUTING AND DATA PROCESSING CENTER The University of Houston in cooperation with business and industry has established a Computing and Data Processing Center on the campus The Center provides a computing service where actual problems of managemont can be solved In addition training of business and engineering personnel in the techniques of high-speed computation is available through formal credit courses inplant training short courses and special programs Specifically the Center is prepared to render the following services 1 Consultation in diversie areas 1 Programming of specific problems 3• Computing and data processing at hourly rates on the IBM 6510 EDPM 4 Formal University training Services are tailored to the requirements of individual clients In general the Center has found that each company has its own unique problems requiring a separate and carefully formulated program To arrange programs and for further Information contact Dr Elliott I Organick Director Computing Data Processing Center University of Houston Texas THE MTITUTE FOR ADVANCED STUDY ELECTRONIC COMPUTER PROJECT The new drum has been in successful operation since the middle of June It Is superior to the old drum not only in speed and capacity both by a factor 6-8 but also in reliability The computer at IAS will serve in the future as a tool for the solution of a great variety of problems of varying length and complexity Most of the coding will be done by tCe customers themselves open shop policy rather than by professional coders In addition the new drum must be incorporated in our coding systems These changes will require a considerable amount of work such as writing manuals service codes subroutines compilers interpreters etc and also a certain amount of engineering which will establish the full usefulness of the present equipment A series of five meetings was held to plan this work in close cooperation with Institute mathematicians engineers and future customers The subjects of these meetings were 1 Notations 2 New Drum 3 Drum Utilization and Subroutines 4 New FLINT u Floating point Interpretive code 5 New Manual It is hoped that the backbone of the new system will be ready by the end of this year and that it will be in full operation In the summer of 1957 - 13 - MURA MIDWBSTBRN UNIVERSITIES R3EZARCH ASSOCIATION MAIDON WISCONSIN The Mldwestern Universities Research Association is a not-tor-profit corporation incorporated under the laws of the State of Illinois in September 1954 Us main objective Is the establishme•nt and operation of a research institute in the Midwest which will provide facilities for research and instruction in the field of high energy nuclear physics and is to be open to all qualified scientists who can make sufficient use of its facilities At the present time fifteen educational institutions make up the Principal Members of this cooperative organluation They are Iowa State College Purdue University Michigan State University Northwestern University University of Chicago University of Illinois State University of Iowa Indiana University University of Kansas University of Michigan University of Mimoceta University of Notre Dame University of Wisconsin The Ohio State University and Washington University of St Louis In undertaking the study of new methods of particle acceleration the technical group of MURA found that purely analytical methods would not suffice From the very beginning of these studies liberal use was made of the Electronic Digital Computer of the Graduate College of the University of Illinois the ILLIAC As of mid-1956 this usage has grown to the order of 150 hours per month Since even more computing time is necessary and since the technical group has moved to Madison Wisconsin MURA has decided to set up a computation laboratory of Its own To implement such a goal MURA intends to be in possession of either through purchase or rental the best computing equipment available at any given time To begin with an IBM 704 has been rented for delivery to Madison in October 1956 The computation group is a division of the MURA technical group other divisions of which are the theoretical physics group and the experimental physics group Since MURA is a pure research and educational organization operated by and for the mid-western universities the technical staff will hold positions which are similar in nature to academic positions The availability of the MURA computer and the cooperation of the MURA computational staff can go far in helping to stimulate and augment strong and effective programs in numerical analysis and computer use in the various MURA universities Certainly the use of the computer in connection with the various research projects within the MURA universities will go far in stimulating interest in and appreciation for modern computers and the power they are able to bring to bear toward the solution of problems in many fields ORACLE APPLICATIONS PROGRAM The services of the ORACLE Oak Ridge Automatic Computer and Logical Engine Oak Ridge National Laboratory's high-speed electronic digital computer will be made available to universities throughout Southeastern U S The new ORACLE Applications Program is being conducted by the University Relations Division of the Oak Ridge Institute of Nuclear Studies and the Mathematics Panel of Oak Ridge National Laboratory ORINS is a non-profit educational corporation of 34 Southern universities operated under direct contract to the Atomic Energy Commission ORNL also a direct contractor to the Commission is operated by Union Carbide Nuclear Company a Division of Union Carbide and Carbon Corporation This program is in line with the Commission's effort to increase the number of trained personnel for work with the growing atomic-energy industry Dr Theodore W Hildebrandt has been appointed to the staff of the ORINS University Relations Division to direct the program He will work with the ORNL Mathematical Panel headed by Dr Alston S Householder in preparing university-originated problems for ORACLE computation - 14 - The ORACLE Apjplication Program is designed to make available to university personnel not only computer time but also the combined experience and knowledge of members of the Mathematics Panel to assist universities with computational problems arising in connection with their research activities One object of the program Is to aid in estending to university campuses a wider awareness of the capabilities of modern high-speed computing equipment which is finding increasing use in research laboratories business and industry The program will also assist university research programs by speeding some computations and making feasible others which time and cost have hitherto madt prohibitive Further Information on the ORACLE Applications Program may be obtained by writing Dr T W Hildebrandt ORACLE Applications University Relations Division Oak Ridge Institute of Nuclear Studies P O Box 117 Oak Ridge Tennessee COMPUTERS OVERSEAS CENTRO STUDI CALCOLATRICI ELETTRONICHE C S C E PISA ITALY This Institute at the University of Pisa was founded about a year ago and intends to construct a large-scale digital machine for scientific research It is hoped to build the central part within the next year and to add a drum memory and fast input and output equipment in 1958 The computer will be a parallel type machine with a word length of 36 bits The main memory will consist of magnetic cores and will have a capacity of 1024 words which may be expandea to a capacity of 4096 words The drum will hold 12 288 words Input will be by photoelectric tape reader and output will be by parallel printer A synchronous d c coupled logic is contemplated Numbers are represented in a fixed point two's complement system The arithmetic unit will have two accumulators one of which will be used as multiplier register The instruction has a full-word length of 36 bits though it is essentially of the singleaddress type Out of the 36 bits 6 are used for function character thus allowing 64 different instructions and 12 for the ordinary address The remaining 18 bits are used for addressing ordinary memory cells with a function similar to that of the B-lines Furthermore the possibility exists of modifying all instructions more than once without employing any special device DEUCE THE ENGLISH ELECTRIC CO LTD STAFFORD The English Electric Company has now completed and installed seven DEUCE Computers and a number of other equipments are in advanced stages of completion Installations already completed indicate an extremely hiL t percentage of good operating time and most of these are already naerating considerably in excess of 40 hours per week At least two frequently exceed 100 hoars and a nvrnber of trouble free runs in excess of 100 hours have been achieved The table below shows the operating figures in hours for the last four weeks in one of the recent DEUCE installations which is maintained by the users own engineers 1 - 15- Week Enon Scheduled Maintenance Good operational Time Unserviceable Time % Efficiency 23 7 30 7 101 100 10 6 82 77 9 17 90% 82% 6 8 13 8 62 122 19 12 43 98 14 100% 87% 385 47 298 40 88% TOTALS These figures must be regarded as being due in a large extent to the very high standard of the Acceptance Tests These tests demand that the input and output organs shall be used continuously and without error for two periods of two hours The number of cards handled in these tests total 30 000 involving the handling of over 11 million binary digits The tests also demand that 16 problems occupying 30 minutes computer time each shall be completed in eight hours with not more than two failures during that time These tests are normally all different and anticipate only a computer in first class order A considerable amount of research and development work to extend the facilities of the Standard Deuce is being undertaken and a modification for automatic instruction modification is already available It is anticipated that a magnetic tape system will be operating in conJunction with a standard Deuce early in 1957 This additional storage capacity augmenting the mercury and magnetic drum stores will permit the Deuce to be used even more widely on many accountancy and data processing operations and will also be useful in certain large-scale technical calculations ELLIOTT BROTHERS LONDON LIMITED As described in earlier editions of the Digital Computer Newsletter the first Elliott 405 Business Computer began operating at Borehamwood Herts in January 1956 Three cabinets of extra computing equipment including Compiler Magnetic Film Slave units Magnetic Film Output unit and Punched Card input together with extra Power cabinets were added to this machine during the last two weeks of August thus demonstrating in practice the unit construction principle on the 405 It was then moved to the London headquarters at 206-216 Marylebone Road of the National Cash Register Co Ltd who are now marketing the Elliott 405 for business applications in Great Britain Compuprinter electric typewriters with a speed of 20 characters per second and a carriage width of 170 characters are being fitted to Elliott 405 systems either operated directly by the computer or remotely by magnetic film A new magnetic disc store holding 32 768 32digit words but otherwise similar to the standard Elliott disc of 16 384 words is now available as a large capacity intermediate-access storage unit EUROPEAN UNIVAC CENTER A 20-ton Remington Rand Univac electronic computing system the first of its kind ever wn across the Atlantic took off on August 6th from Idlewild International Airport via Seaad Western Airlines and landed the following day at Frankfurt Germany The Remington Rand International Division of Sperry Rand Corporation is establishing the first large-scale computer service center in a specialty designed building at the Battelle Institute Frankfurt Scheduled for opening this fall the European Univac Center will provide business government and science in western Europe with services comparable to those available at the Univac Centers in New York and Los Angeles - 16- The Battelle Institute has in the short time of its existence pined European renown as a non-profit research institute In addition to its facilities in Frankfurt the Institute has laboratories and offices in Geneva Switzerland London England Paris France Milan Italy and Madrid Spain In charge of the European Univac Center is Dr Carl Hammer noted American mathematician born in the United States and educated in Germany COMPONENTS CARDATRON PUNCHED CARD INPUT-OUTPUT SYSTEM The r-t RDATRON manufactured by ElectroData Division of Burroughs Corp is a specialized multiple input-output buffer system which provides direct flexible high-speed simultaneous communication between various types of card machines or printers and the DATATRON central computer under control of the central computer The CARDATRON controls any combination of card machines up to seven units Complete alphanumeric card reading computation card punching and line printing occur in the same time cycle and at a rate well matched to the speed of the computer Input-Output Facility The following variety of standard punched card machines may be used with the CARDATRON's Input and Output Units Input Devices Type 089 Collator Type 528 Reproducing Punch Type 523 Gang Summary Punch Output Devices Type 407 Tabulator Type 419 Tabulator Type 523 Gang Summary Punch Buffered Operation Within each Input and Output Unit a small magnetic drum acts as temporary storage for information The DATATRON Computer receives input information from the buffer drum of an Input Unit and delivers output information to a buffer drum of an Output Unit Thus the relatively long time required for mechanical movement of punched card device Is not deterrent to computer operation Simultaneous Operation The buffering feature of the CARDATRON system permits simultaneous operation of readers punches or printers In a multiple printing situation the computer can calculate the first Manufactured by International Business Machines Corp - 17 - set of answers and load the buffer drum associated with the first line printer Then while the first printer is operating the computer can proceed to calculate and load the buffer drums associated with the other line printers in order By the time the first printer has finished printing the computer will have loaded the other buffer drums and is able to reload the first buffer drum again In this way the computer can utilize up to seven printers continuously all operating at maximum speeds A sinilar situation exists during input operations and output operations using a combination of printers and punches Automatic Editing The CARDATRON system can perform a variety of editing functions on the information handled The buffer drum of each Input and Output Unit contains five format bands These format bands control the scaling and alphanumeric translation of information Any of the five format bands on a buffer drum may be selected to edit a given card or line or information in the following ways Deleting Digits-Any character may be removed on input and output Inserting Zeros-On Input only zeros may be added at the beginning or end of an information field or inserted between characters in a field Inserting Blanks-On Output only blank columns may be added at the beginning or end of an information field or inserted in the field Zero Replacement-On Input only characters on an input card may be replaced by zeros Alphanumeric Operation and Automatic Code Conversion The CARDATRON System handles both alphabetic and numeric characters on input and output in any combination Numeric digits may be used in an alphabetic field TLe CARDATRON Syst am automatically translates between standard 80-column card coding and the equivalent DATATRON coding DATATRON FLOATING POINT CONTROL UNIT AUTOMATIC FLOATING POINT OPERATION FOR DATATRON COMPUTER The DATATRON Computer is the first medium-sized data processor to make available the convenience and coding simplifications of automatic floating decimal arithmetic for the operations of addition subtraction multiplication and division This facility I provided by the Floating Point Control Unit which is optional with the computing system This unit performs arithmetic operations in a floating decimal manner on numbers which are normalized and which have an associated power of 10 scale factor stored with them in 5tje comput I's memory leaving the answer in normalized form It has a number range of 10-i _ N i0nw The advantages of automatic floating decimal operations are 1 Shorter codes takin up less memory space 2 More than proportionate reductions in coding and checking times 3 Eliminates problem scaling to a large extent 4 Improves utility of the computer in a wide range of problems 5 Reduces machine running time - 18- In genetal the time required to fetch an order and perform an arithmetic operation in the floating point mode will be equal to or less than its fixed point counterpart for example Floating Point Add 2 5 ms Floating Point Subtract 2 5 ms Floating Point Multiply 10 1 ms Floating Point Divide 13 5 me MISCELLANEOUS As of August 31 1956 International Business Machines had delivered twenty-five type 704 Electronic Data Processing Machines and twenty-eight Type 705's thus bringing the total number of delivered 700-Series machines including 701's and 702's to eighty-six Four hundred and five Type 650 Magnetic Drum Data Processing Machines will have been delivered by August 31 Establishment of an ElectroData Division of Burroughs Corporation to produce and sell electronic data processing systems has recently been announced The new division will have responsibility for manufacturing and distribution of DATATRON a high-spued general purpose digital computing system developed by ElectroData It also will be responsible for distribution of the Series E desk-sized electrouic digital computer produced in the Main Plant Detroit the Series G high-speed printing tabulating and card-punching equipment being produced by Control Instrument Company a Burroughs subsidiary in Brooklyn N Y and new electronic products as they are developed by the Corporation's divisions or subsidiaries ElectroData was established as an independent affiliate of Consolidated Electrodynamic Corporation of Pasadena in 1953 after having been formed originally as the Computer Division of the latter corporation As of I September 1956 Remington Rand Univac has delivered approximately 100 largescale electronic digital computers This includes classified installations 30 Univac I's and 18 Univac Scientific's In addition the first Univac File Computer was delivered in August 1956 Remington Rand Univac now has well over a hundred firm contracts for the Univac File Computer Underwood - ELECOM recently delivered the first ELECOM 125 and 120A Computers of the current production series from its Long Island City plant to the Sandia Corporation at Albuquerque and the Texas Company at Houston respectively Sandia's ELZCOM 125 included in addition to the basic computer 4000-word memory and power-supply cabinets three magnetic-tape units and peripheral equipment for high-speed paper-tape read-in and write-out to and from the computer The ELECOM 120A Computer pirchased I y the Texas Company features base registers and floating decimal operation and will be used for calculations attendant geophysical oil exploration - 19- The Norden-Ketay Corporation announces that a West Coast Department of the Norden Laboratories Division was established in February 1956 This organization is responsible for the advanced developments in the field of digital control data handling and special-purpose digital developments and is headed by Mr H H Sarkisslan This new department has developed a digital comparator for use in a thirteen-bit parallel binary servo Other developments include a digital airborne television generator transistorized airborne computing amplifier and other related equipment In the process of development is a high-speed printer and linearizer Beckman Instruments of Fullerton California have introduced their Model II Data System the first of which has been installed at a major southern refinery This equipment is designed for use in the continuous process industries and acts as a connecting link between input transducers and final printed logs and recorded data compatible with computing equipments The system accuracy and reliability permits continuous round-the-clock operation One of the features of the equipment is the digital ' pinboard control which permits complete flexibility in the operations to be performed upon each data channel Operations of simple algebra linearizing square rooting establishing alarm limits etc are all accomplished by means of the pinboard using the true physical units of the variables involved UNIVERSITY OF PENNSYLVANIA The Moore School of Electrical Engineering Graduate courses of special interest to computer scientists and engineers to be offered in 1956-57 are listed below New offerings 3E 608 Sampled-Data Control Systems 3 6687 Linear Programming and an Introduction to the Theory of Games Previous courses being repeated 3E 523 Introduction to Digital Computers 33 616 Statistical Theory in Communication and Control Circuit Analysis 33 621 Matrices and Temsors in Circuit Analysis includes topology applied to switching circuits BE 624 Engineering Solution of Differential Equations 33 6N5 Digital Computers-Engineering Principles 3 609 D gital Computer Solution of Engineering Problems BE 632 Switch Circuits 3E 634 Applications of Large-Scale Digital Computers to Busin ss and Industrial Systems NEW HOUSE ORGANS DDA SUMMATION reporting digital differential analyser methods in computation and control Litton Industries Computer and Controls Division 336 N Foothill Rd Beverly Hills California 20 - THE PINBOARD published by Burroughs Corporation as a service to users of the E101 Computer Computer Section Burroughs Corporation 1616 Walnut Street Philadelphia 3 Pennsylvania CONTRIBUTIONS FOR DIGITAL COMPUTER NEWSLETTER The NEWSLETTER is published four times a year on the first of January Aprii July and October and material should be in the hands of the editor at least one month before the publication date in order to be included in thit issue The NEWSLETTER is circulated to all interested military and government agencies and the contractors of the Federal Government In addition it is being reprinted in the Journal of the Association for Computing Machinery Communications should be addressed to A J Neumann Editor Digital Computer Newsletter Office of Naval Research Washington 25 D C -21- 1 m u r • • uu_- d u 121 A•