July 1976 Contents Volume 9 Number 7

ARTICLES

Cover design: See page 2.

CIRCULATIONComputer Magazine i. published monthlyby the IEEE Computer Soclety, S5B NaplesPIae, Suite 301, Lone Beach, Caifomia90803, (213) 438-9951. Annual subscriptionIncluded in Society member dues. Non.member pricess aealleble on equet. Singlecopy prices: members $3.00; non,members06.00. This journal is ales a-alaidle inmicrotiche forn. UNDEUVERED COPIES:Address s11 correspondence regeading unsdelloered copies of Cemputerto: IEEE Heed-quarters, Technicat Sen-ices, 345 Ent 47thStreet, New York, New York 10017.

POSTMASTER: Send form 3675 to ComputerMegazine, IEEE Headquarters, TechnicalSenices, 345 Ent 47th Street. New York,New York 10017. Second class postage Ispaid at New York, New York and at addOiOaimailing offces. Copyright Q 1976 by thbInstitute of Electrical and ElectronicsEngineem, Inc.

ADVERTISINGFor Information about dlsplay, conterence,or classified advertising In Computer, con-tact Advertising Manager, Computer,58S5 Naples Plaza, Suite 301, Long Beach,CA 90803; (213) 4389951. East CoastsMartin a Hart, Inc., 00 Main St.. Keyport,NJ 07735; (201) 739-00.Japan: Intemational Media Repensentatines,Ltd.: 1, ShlbhaKotohiracho Mlnatoku, Tokyo,Japanew 5023.

EDITORIALReftr to Call for Papers section for menu.script submittal requiements.Unless othenwle stated, bylined articles,as well as products and services offred inNew Products, New Applcatieons. ShortCourses, ard The Repository, reflect the*uthor s or firm's opinion; Inclusion In thispublication does not necessarily constituteendorsement by the IEEE or the CornputerSociety.

SOCIETY SF

NATIONAL ASSOCIATIONPUSLICAIOSNS

July 1976

13 HYBRID COMPUTER SYSTEMSGuest Editor Robert M. Howe

15 HYBRID DIGITAUANALOG COMPUTER SYSTEMSJ. Paul Landauer

26 SOFTWARE FOR HYBRID COMPUTATION-PAST, PRESENT, AND FUTUREHarriett B. Rigas

31 A QUANTITATIVE METHOD OF SPEED COMPARISON BETWEEN ANALOGIHYBRIDAND DIGITAL COMPUTERSRobert M. Howe and J. Paul Landauer

37 HYBRID COMPUTATION 1976 AND ITS FUTUREArthur /. Rubin and J. Bruce Mawson

55 A NEXT-GENERATION HYBRID COMPUTER SYSTEMG. F. Graber and E. J. Fadden

64 THE SECOND ASILOMAR WORKSHOP ON MICROPROCESSORSJohn Hiles

go COMPUTER SOCIETY OFFICER AND GOVERNING BOARD NOMINEES

DEPARTMENTS

3 Technical Editor Announcement3 IEEE Computer Society Roster4 Update

11 Letters to the Editor66 Open Channel68 New Products71 New Literature72 IC Announcements73 New Applications76 Repository

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Editorial Schedule for TransactionsCalendarCall for PapersProduct IndexAdvertisers IndexShort CoursesClassified AdsBook ReviewsThe Bookshelf

Reader Service Cards and Order Forms, p. 87 and 88.

Coming Next Month: Computer Graphics and Man-Machine Interactions

Editor and PublisherTrue Seaborn

Assistant Editor Advertising Manager Art Director ProductionMarilyn Potes Dawn Peck Jay Simpson Ken Duckworth

Technical EditorJack D. Grimes

Book Reviews Education New Products Open Channel Technical SessionsFrancis P. Mathur David Irwin D. A. Michalopoulos James H. Haynes John E. Hiles

PUBLICATIONS COMMITTEEChairmanHarlow FreitagIBMGeoffrey W. GatesBell LabsRex RiceFairchildSemiconductor

Ex OfflcioEditor-in-ChiefWarren L. SemonSyracuse Univ.

Rolland B. ArndtSperry UnivacMartin GrahamUC Berkeley

Jack L. RosenfeldIBM

Richard E. MerwinU.S. Army BMDProgram Office

Theodore H. BonnSperry Research CenterSeymour JefferyNBS

Jack E. ShemerXerox Corp.

True SeabomIEEE ComputerSociety

Robert A. ShortOregon State Univ.

Jack D. GrimesTektronix

Paul deMainePenn State Univ.

D. A. MichalopoulosCSU, FullertonHarold S. StoneUniv. of Massachusetts

Raymond T. YehUniv. of Texas

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