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THETEAC -70. DoIitknock it if you haven't And now you can try it. Watch the warning light wink -t For 10 days. Free. on as you reach the end of your I . That's how confident tape in the Philips-type cassette. tried we, of TEAC, are about our Then wonder at how we rugged little R-70 cassette data packed all of these features (and recorder holding up its end of our more) into this 5"x14"x10"totally reputation. self-con tained 14-pound data Try it. See how it performs in recorder. your operation on its own self All for the price of $1995, contained batteries, or external including eleven accessories! AC or DC. If you'd like to tryout our R-70 Check its frequency response: on a current problem or proj ect, FM mode is now DC to 800Hz; we're game. direct from 100Hz to 8kHz. Just write or call Ken William And use it either FM or DR son, Director of Marketing, wi th a fti p of a switch on any of Technical Products, TEAC Cor its four channels. poration of America, 7733 Tele Locate your voiced comments graph Rd., Montebello, CA 90640. or other data quickly with its Telephone (213) 726-0303. built-in tape counter. He'll tell you how you can .Monitor the channels individu take a ally via the built-in meter and/or by output to your scope. T EAC® and try it. CIRCLE 28 ON READER CARD TAPE PERIPHERALS MODELS 22+, 30+, 40+, 50+, 65+ Who has Fabri-Tek produced core memo ries for over the past 15 years? Hundreds of companies, including: CDC Canadian Westinghouse XDS Ferranti (Canada) Honeywell GE (Canada) DEC Elliot (England) GE Olivetti (Italy) Burroughs ICL (England) . Varian Honeywell-Bull (France) NCR AEG-Telefunken (Germany) Litton English Electric (England) CFTH (France) CII (France) And yes- even IBM! Now you can capitalize on this expertise, as this growing list of 360 customers and users are doing: Booth Computer Corporation • Dearborn Computer LeasIng • Diebold Computer Leasing • Leasco • Greyhound Computer of Canada Limited • National Computer Rentals • Rockwood Computer Corporation • Grumman Systems Corporation • Intertek, Inc. • Gant Shirtmakers • Chicago, Milwau kee, St. Paul and Pacific Railroad • Eagle Discount Supermarkets • United Farm Agency • Medtronic, Inc. • Accounting Corporation of America • Rome Research, Inc. • Weldon, Inc. • Certified Grocers Our complete, high-performance line: Co-Op • Kentucky Farm Bureau Mutual MOD 22+ expands main memory of 360/22 to 64K bytes. Insurance Company • Graco Inc. • E.B:S. MOD 30+ expands main memory of 360/30's to 128 K bytes. Data Processing Inc. • Bell Telephone of MOD 40+ d' f 360/40' 512 K b Penn. • Hudson Bay Company • Rockland expan s main memory 0 s to ytes. State Hospital • J & L Steel • Trans Union MOD 50+ expands main memory of 360/50's to 1024 K bytes. Systems Corporation • University of Rhode MOD 65+ expands main memory of 360/65 to 2 megabytes. Island • Computoservice, Inc .• Faultless SALES OFFICES Starch Company • Waldbaums, Inc. • MAl Long Beach, Calif. (LA area) ... 213/420-2493 Auburndale, Mass. (Boston) ... 617/969-5077 Equipment Corporation • G.S.A. • U.S. Sunnyvale, Calif. (SF area) .... 408/739-4780 Cherry Hill, N.J. (Pa. &So. N.J.) .609/667-7722 Department of State. Phoenix, Ariz ............... 602/266-4448 Parsippany, N.J. (Metro N.Y.) .. 201/263-2330 Melborne, FI. (Miami area) .... 305/724-0900 Columbus, O............... 614/262-7966 Nationwide Service: Over 900 service Westport, Conn ............. 203/226-6949 Oklahoma City, Okla ......... 405/843-6444 representatives from Sorbus, Inc. pro- Atlanta, Ga ................. 404/457-0821 Dallas, Tex ................. 214/748-2764 vide you with 24-hour field maintenance Chicago, III. ............... 312/437-4116 Houston, Tex ............... 713/772-7050 in over 90 cities in the U.S.A. Canadian Minneapolis, Minn ........... 612/935-8811 Rosslyn, Va. (Wash. D.C. area) .703/525-6435 service available through MAl Canada SALES REPRESENTATIVES Ltd. in 12 Canadian cities. Seattle, Washington Computer Suppl!es ............................. 206/623-2413 We back our products, and you can be sure Portland, Oregon Computer Supplies ............................. 503/222-2006, . t b h t . 360 Kansas City, Missouri Computer Systems/Graphics .. , .... " ., " ......... 816/474.4690 we re QOlng 0 e er~ 0 service your. Clayton, Missouri Computer Systems/Graphics ...................... 314/862.0787 memones - and provide spare parts - for Minneapolis, Minnesota Data Serv Equipment ............................ 612/546-4422 as long as you need. And furnish your next CANADIAN REPRESENTATIVES generation memories as well. Toronto Greyhound Computer of Canada ....... , " ......... 416/366.1513 Let us show.you how a real leader c~n Montreal ·Greyhound Computer of Canada ................... 514/866-3475 perform: Fabn-Tek, Inc., 5901 South County Ottawa Greyhound Computer of Canada ................... 613/225-4690 Road 18, Minneapolis, Minnesota 55436. Alberta &British Columbia Computer Supplies ............................. 206/623-2413 Phone 612-935-8811. TWX 910-576-2913. Leader in memory technology ~A~~~~ ®1f"~1~ INC. for over a decade. MEMORY P.RODU~TS DIVISION 2 CIRCLE 15 ON READER CARD CRTRMI=lTION FEBRUARY, 1972 volume 18 number 2 This issue 110,518 copies 28 The Postal Service: Past, Present, and Future AL VIN P. HANES. The Postal Service looks like a business, but it doesn't have the choice of selecting the best markets. 32 Computer Addressed Letter Mail ARNOLD I. DUMEY. Error detection and correction require ments for accurate letter sorting can be met if the proper coding is established and accepted. 36 Postal System Input Buffer Device ROBERTSON OSBORNE. Here is an element of the postal sys tem that has proved reliable, versatile, and capable of with standing a hostile environment. 40 The Quality of Life MIL T STONE. Part 2 of our research report series on people in computing shows the analysts, programmers, super visors, and operators at work-defining their jobs and at titudes. 48 Programming in a Paging Environment R. L. GUERTIN. Large working sets often lead to gross in efficiency by requiring the operating system to constantly move pages in and out of physical memory. Here are methods of avoiding this. The NRMA Information Systems and Telecommunications Conference. A conference report. IEEE Computer Society. A conference report. News in Perspective What is the extent of a computer supplier's liability when he sells systems to the government? If an IBM computer didn't schedule engine maintenance at the right time and an Air Force plane crashed, would IBM be liable? IBM wants the GSA to come up with a definition of "conse quential damages." It's a fight that could impact every federal dp supplier. The Forum: The End of Adolescence? c. A. IRVINE. Growing up has always been a painful, but necessary, process. Perhaps our current economic difficul ties will hasten the transformation of boys into men. About the Cover While the gears of the postal gods grind slowly toward au tomation, the venerable stamp machine still functions with modest efficiency, offering sturdy hope for more zip in the future. Our design is by photographer Georg Schacht. February, 1972 3 DRTRMRTICN@ EDITORIAL STAFF Editor Robert B. Forest Managing Editor Edward K. Yasaki Senior Associate William J. Rolph Editors Tom McCusker Associate Editors Richard A. McLaughlin Edith D. Myers Copy Editor Janet Eyler Assistant Editors Michael William Cashman Alma O'Steen Special Features Editor Angeline Pantages New England Editor W. David Gardner Washington Editor Phil Hirsch Southwestern Editor Robert F. Alexander European Editor Pearce Wright Australian Editor Frederick A. Bland Contributing Editors Howard Bromberg, Philip H. Dorn, Louis B. Marienthal, Milton M. Stone, F. G. Withington, Paul Armer, Michael A. Duggan Editorial Adviser Robert L. Patrick Technical Consultant Lowell Amdahl EDITORIAL OFFICES Headquarters: 94 S. Los Robles Ave., Pasadena, CA 91101, Phone: (213) 681-8486; Eastern: 35 Mason St., Greenwich, CT 06830, (203) 661-5400; 19 Marlborough St., Boston, MA 02116, (617) 267-9414; 9805 Singleton Dr., Bethesda, MD 20034, (301) 530-7271; Southwestern: 2711 Cedar Springs, Dallas, TX 75201, (214) 744-0161; Foreign: 65, Hill Road, Chelmsford, Essex, England; We make Formscards 322, Park Regis, Park St., Sydney, NSW 2000, Australia. GRAPHIC DESIGN & PRODUCTION Art & Production to fit your specs. Director Cleve Marie Boutell Production Manager Marilee Pitman CIRCULATION 35 Mason Street, Greenwich, CT 06830 Not vice versa. Circulation Director Suzanne A. Ryan Circulation Manager Mae Van Rennes We offer 22 sizes at sensible prices. So you can slash Marketing Research keypunching by using the same card for computer Director Douglas De Carlo input and output. So you can speed inventory. Or Publisher Gardner F. Landon bring orders-and checks back sooner. Or organize Associate Publisher James M. Morris parts and service operations. Or pay bills or people. Circulation audited Forms with MICR or OCR. Numbered or plain. To by Business Publications '-I::t!i your specs or ones we help you develop. Name it. Audit Chances. are we can do it. And deliver on time at Member, American least 97% of the time or better. Business Press, Inc. We invented the famous F ormscard - the first DATAMATION is pub continuous, processable, no-medial-strip card. We're lished monthly on or ~ about the first day of out front with equipment to produce them and with every month by Tech- ways to use them. Before you take "can't" for an nical Publishing Company, 1301 South Grove Ave., Bar rington, Illinois 60010; Arthur L. Rice, Jr., President; answer again, ask us. We're known as the Can-Do Gardner F. Landon, Executive Vice President. Executive, Circulation and Advertising offices, 35 Mason Street, people. Greenwich, CT 06830 ,1(203) 661~5400. Editorial offices, 17 94 So. Los Robles Avenue, Pasadena, CA 91101. Pub Fqr starters, ask for Inventory Sample Kit ** lished at Chicago, III.