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Department of Electrical Engineering Display of digitally processed data Item Type text; Thesis-Reproduction (electronic) Authors Jurich, Samuel, 1929- Publisher The University of Arizona. Rights Copyright © is held by the author. Digital access to this material is made possible by the University Libraries, University of Arizona. Further transmission, reproduction or presentation (such as public display or performance) of protected items is prohibited except with permission of the author. Download date 23/09/2021 17:48:33 Link to Item http://hdl.handle.net/10150/551403 DISPLAY OP DIGITALLY PROCESSED DATA ■ v : ' hJ Sarauel Jurlch A Thesis Submitted to the Faculty of the : - ‘ DEPARTMENT OF ELECTRICAL ENGINEERING In Partial Fulfillment of the Requirements For the Degree of : o ' MASTER OF SCIENCE : ' In the Graduate College A UNIVERSITY OF ARIZONA 1 9 5 9 This thesis has been submitted in partial fulfillment of requirements for an advanced degree at the University of Arizona and is deposited in the University Library to be made available to borrowers under rules of the Library. Brief quotations from this thesis are allowable without special permission, provided that accurate acknowledgment of source is made. Requests for permission for extended quotation from or reproduction of this manuscript in whole or in part may be granted by the head of the major department or the Dean of the Graduate College when in their judgment the proposed use of the material is in the interests of scholarship. In all other instances, however, permission must be obtained from the author. SIGNED: This thesis has been approved on the date shown below: 6 4f/?y /9S~<7 John R. Featherston Date Asst. Professor of Electrical Engineering ACKNOWLEDGMENT The author wishes to express his appreciation to Professor John E 9 Featherston for the assistance and encouragement given during the execution and completion of this thesis 0 Table of Contents Chapter 1 INTRODC CTIOU oooooooooooooooooooooooooboooooooooooo l.ol ■. Cathode Ray Tube Rxsplays o ©o & © © © © ©©©o©-©©©©© © © 102 Statement of Problem ©,i O 0 0 0,0 © O do ti O O O 6 O O O O O O O O O o 2 . STSTEtt: MALYSIS AND' DESIGH ©©©©:© © ©»«-©».©.©© ©©©©©©©© 1 ■ 2ol General pe script ion of Approach © © © © © © ©o©.©,© o© © 2 ©2 Method of Television Scanning:©,i o b o o o o o o d o o o o o d 2,3 System Requirements and Concepts ©,,(OOOCOOOOOOO ^ SYSTEM .I3ESXQM © o o o o Q o o o o 6 o o o p op© o o o o o o o o o o o o b o o d 6 o o 3 ©1 Properties of Digital Circuits © © © © © © © © © © © © © ©© 3 ©2 Input Cxrcuxtry © © © © © © © © © © © © © © © © © © © ©. © © © © © © © © © © 3 ©3 Counter © © © © © © © © © © © © © © © © © © © © © © © © © ©, © © © © © © © © © © © © 3 olx logic ©©ooooo©oooo©oo©o©©o©ooo©©oo©©©oo.o©o©o©0 3©5 Definition of the Display System o©©©©©©©©©©©© » 3 ©v Ssmchronxzer © © © © © © © © © © © © ©,© © ©' © © © © © © © © © © ©,© © © © © 6 U ' EIPER1MEKTAL RESULTS © © ©> O O O O 0-0 0 0 0-0 O O O -0,0 O O O © O O• o o © o o o itol- Equipment Description. © © © © © ©O O O O O O O O 0 0.0.0 O O o o o o I).o2 ■ Test Results O o o o d o o o O " O o o o o o.o.o o o o o o b o o o b o -o o o b o p©3 Design Limitations and Problems © © © ©oooooooooo Chapter Page 5 A PRACTICAL APPLICATION * * * o o o ^d,oooaoo»oooooooo*o 1|2 5 ol Introductory Remarles <> © <5 g p o <a © © o o o o o o o o o © © o © © © Lj-2 5 °2 Description of the Display 00 © © o © © © © ©.o © © © © © © o 10 5 o3 Data Transfer & © © © © © © © © ©*© © © © © © © © © © © © © © © © © © o* © © 1^6 6 , CONCLUSIONS © © © © © ©«.©7 ©, © © © © .© © © © © © © © © © © © © © © © © © © ©©op© © 1^7 ■6 ©I Reyxew of Approach © © © © © © © © © © © © © © © © © © © © © © © <> © © h^!J 6 o2 Conclusxve St at enieht s © © © o © © © © © © © © © © © © © © © © © © © 1),7 7 SUGGESTIONS FOR PURTHBR STUDY oo©co©©o©oo©©o©o©©oo 49 . 7ol Graphical Interpretations of Computer ReSUlt S o © o o 0 d o o © 0 o © o © © o o' o © © o o 0 o » o © o o 0 o d o 6 © © o lj.9 7o2 Additional Areas © © © © © © © © © © © © © © © © © © © © © © © © © © © o 49 APPENDIX -- WAVEFORM ANALYSIS oo*po*^,,oo,»*o6».».oodoo»ooo 51 List of Figures Figure . Page tl_ ©1 ^PA.GF oooooooooooeooooooooooodboooooooooeoooooooo ll* S ol Oys Gem Bloclc Lx3.grshi ^ © o o o © o © © o o o o o <» o © © o o © <> © © © © © 9 2 ©2 ^DxiRXii.g Diagram © © d © © © © © © © © © © © © © © © o © © p © o © © © © © © © © © © 10 3 ol ' liiluput Oat e © © © © © © © © © © © © © © © © © © © © © © © © © © © © © © © © © © © © p © lo 3 Input Register © © © © © © © © © © © © © © © © © © © © © © © © © © © © © © © © © © 17 3 0 Bistable Multxvxbrat or o© © © © © © © © © © © © © © © © © © © © © © © © ©. 19 3 ©i^Binary Oounter © © © © © © ©»o © © © © © © © © © © © © © © © © © © © © © © © © © 22 3 ©3 Symbolic Network © © © © © © © © © © © © ©»© © © © © © © © © © © © ® _.© © © © © 23 3 © 6 Diode Logic Circuit■© © © © © © © © © © © © © © © © © © © © © © © © © © © © © 26 3 o 7 I-Signal Generator © © © © © © © © © © © © © © © © © © © © © © ©. © © © © © © © 27 3 ©S 1-Signal Generator © © © © © © © © © © © © © © © © © © © © © © © © © © © © © © 2S 3 o9 Synchronizer Block Liagrdjn © © © © © © © © © o © © © © © © © © © © © © pO 3 ©lo Synchronizer 'Schematic ©©©©©©©©©©oo©©©©©©©©©©©©©© 31 U©! Synchronizer (Photograph) © © © © © © © © © © © © © © © © © © © © © © © 35 ii©2 Y~Signal Generator (Photograph) © © © © © © © © © © © © © © © © © 35 kS Syncnronizer Signals I © © © ©•© © © © © © © © © © © © © © © © ©■© © © © © 37 ©l^- Synchronizer Signals XI ©o©©©©©©©*?©©©©©©©©©©©©©©© 37 il©^3 Synchronizer Signals III ooo©©©©©©©©©©©©©©©©©©©©© 3S Figure ' . Page i_L 06 Vertical Signals o 000 o o o o o o o»o o»o o»»o o o 6 0 o o o o o o 0 0 k o 7 ■ .Horizontal Sxgnal.s 0 <>»<> ® <>»o o <> o <• e«s o»»^»o o <> o»o o 0 0 © 39 l^-oS Logic Signals 0000000c & a 00000 0 0 © 000000 0000 © o-0 0 000 39 501 Display of Hard Tube Modulator Pulse ococo*oco©oo I4I4 502 Computed Hard Tube Modulator Pulse <,0000000000000 1+5 OmPTBE -1 : IlTmiCTION An important component in the conumnication of information . to the user of a digital computer is the output equipment 0 Often the speed at which data is obtained is limited by this equipmento In addition, the nature of the data at the output may not be in a form which is readily analysed and interpretedo For these reasons, considerable interest recently has been in the output devices re= quired for digital computers = Mary solutions to the problem of high speed readout with accuracy and flexibility have been proposed, are in existence, and are being developed = Among these are systems using cathode ray tubes c 1.1 Oathode Bay fube Displays • Two approaches using, cathode ray tubes (ert) have been pursued. Tubes, such as the. Charactron and Typotron, have been devel­ oped which enable rapid coding of characters and positional informa­ tion upon the tube face. These devices use electrons shot through a matrix of cutouts in the shape of the characters within the tube to display these symbols. The other approach, similar to the IBM yij.0 and 780-units, displays output information by conversion of digital- to-analog data which is then displayed on an oscilloscope. Alpha­ betic and numeric characters are generated by the display of points under coatrol of routines 0 The IBM 7U0 crt recorder^- is a digital- to=analog; eomrerter aonsisting of a seven-inch cathode ray tube and control eireuitiy used with a film recorder. The 78Q display is a 21-inch cathode ray tube system which, provides visual display of data being recorded in the unit * The data to be displayed is transferred from the computer to the deflection registers of the display. The recorder (7I4-O) first converts the data to dual de­ flection voltages.After the voltages reach the desired accuracys the crt’s are unblanked and the coordinate point is displayed0 Thuss the IBM displays are of the spot positioning and printing type. A circuit used with IBM display systems has been described in literature^. The circuit provides the conversion of positional information from digital-to-analog in a magnetic de­ flection system by the use of binary weighted s constant current sources. Outputs from the switch tubes used are tied in parallel and fed to the deflection yoke. The experimental system requires selected tubes and . precision resistors0 Over a period of Jp hours the system remains to within an accuracy'of positioning of 0.1^ with no visible evidence of drift c - y ■ • .- ' JOli Electronic Data Processing Machine Manual of Operations - International Business Machine Corporation - 195U-55? pp. 63-650 p ' ; ,v ■ Eo Jo Smura, A Binary-weighted Current Decoder9 IBM Journals Octoberj 1957s pp. 556=5527™ : ■ : . ■: , ; ' ->■ ■ 3 • 1 02 Statement of Problem This thesis presents another original approach to the display of digitally processed data« The display system output would consist of a commercial video monitor system<, The picture tube would be conventionally swept in the horizontal and vertical directionso Howevers the sweep signals would be electrically divided into segments by the equipment of this thesis& ; These segments would be counted in binary counters» For a particular point.to be displayedy the coordinate information would be compared with the count in logic circuits<, A coincidence of the resultant abscissa and ordinate pulses would provide an unblanking pulse for the print axis of the cathode ray tube« The problems of providing such a display are those of anal­ ysis of the system requirements, the design and mechanization of the electric circuitry to perform the desired quantizing and point selec­ tion, and the evaluation of the system<, The equipment of this, thesis was designed to be compatible with the existing Special Purpose Arizona Computer, Experimental (SPACE) equipment and coneeptSo Figure 1»1 shows the equipment involvedo The existing SPACE equipment consists of input-output equipment with tape memory» Binary signals from the typewriter are converted to gated audio tones and stored in this memory = This data can be taken from memory,and decoded into binary signals for typing out information or to provide point information to the display equipment of this thesis 0 TYPEWRITER MAGNECORD TAPE RECORDER 48 CH.
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