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Electronics-1979-08-02.Pdf AUGUST 2, 1979 EIGHT-BIT SLICES YIELD FAST, HIGH-DENSITY LOGIC/120 How IBM's advanced packaging condenses processor power/ 109 Low-glitch d-a converter clears up display problems/ 131 Electronics ORGPflIZInG BUBBLE MEMORY ARRAYS And save you valuable space. Model 20 SIP trimmers save you precious PC Model 20 SIP trimmers have a low tempco of board space, yet don't cost a fortune. Only 100 ppm/°C over —55°C to +125°C .785" X .185" X .079" in size, the Model temperature range. Power rating is 0.50 watts at 20 SIP trimmer occupies just 25% of the board 70°C. The stable cermet element offers infinite space used by comparable DIP configurations and resolution. The wiper assembly idles at both 50% of that used by conventional /34 -inch ends of travel, eliminating damage from forced rectangular trimmers. The low board profile of adjustment. .185-inches and .100-inch spacing are ideal for Put these little jewels to work for you. Dramatic meeting all of your high density PC board space savings, the ring of Boums quality, trimmer needs. and sparkling performance, too. Contact your local Priced at only 75C* in 1,000 to 4,999 quantities, Bourns representative for evaluation samples Model 20 SIP trimmers are available in 18 or send today for complete details. Or, see EEM standard resistance values ranging from 10 ohms directory, Volume 2, pages 3804, 3805. to 5 megohms. Options of either hand or TR1MPOT PRODUCTS DIVISION, BOURNS, INC., machine insertion, plus compatibility with 1200 Columbia Avenue, Riverside, CA 92507. automatic test equipment add up to more cost Phone: 714 781-5050. TWX: 910 332-1252. savings yet. European Headquarters: Boums AG. Zugerstrasse 74 6340 Baar. There's no sacrifice in performance either. Sealed Switzerland. Phone: 042 33 33 33. Telex: 78722. to withstand industrial cleaning processes, •Domesuc U SA pnce only 17;. 11111111 - pounni\TÉ° For Immediate Application—Circle 120 For Future Applicatio Our basic miniature snap action precision switch (up above) Then there's our choice of terminals: screw, solder or QC. And, is the standard of the industry. 34,816 variations make it our choice of circuitry: SPDT, SPST/NO or SPST/NC. Add it all the standard of the switching world. up and you'll come to three conclusions: Example: Our miniature comes in 17 standard actuators... 1. This is the most versatile miniature switch plus 43 more special forms and shapes already tooled (like the you can spec — 34,816 times over. examples down below) ...plus Cherry will produce any design your 2. Only Cherry—with 25 years of snap switch application needs. The standard actuators alone range from as experience— could offer such a lollapaloosa at high as 400 grams operating force at 15 amps to an operating the right price., with the right delivery dates. force as low as 2grams at 3amps. 3. You need our complete catalog...and Example: Our miniature comes in your choice of five (count free sample switch. Just call...write...or them!) five ratings— from 0.1 amp gold crosspoint contacts... to a TWX ... say "Lollapaloosa!"... and we'll send full 15 amps. With 3, 5and 10 amps in between. you both. Free. No strings. CHERRY ELECTRICAL PRODUCTS CORP. Sunset Avenue, Waukegan. IL 60085-312/689-7700—TWX 912/235-1572 Circle 1 on reader service card Low-cost hard disk computers are here 11 megabytes of hard disk and 64 kilobytes of fast RAM in a Z80A computer for under $10K. Two floppy drives, too. Naturally, it's from Cromemco. It's a reality. In Cromemco's new microcomputer field. Software Cro- Included in that cabinet, too, is Model Z-2H you get all of the above memco is known for. Software like Cromemco ruggedness and reliability. and even more. With Cromemco you this: Cromemco is time-proved. Our get it all. • Extended BASIC equipment is a survey winner for In this new Model Z-2H you get • FORTRAN IV reliability. Of course, there's Cro- not only a large-storage Winchester • RATFOR (RATional FORtran) mennco's all-metal cabinet. Rugged, hard disk drive but also two floppy • COBOL solid. And, there's the heavy-duty disk drives. In the hard disk drive you • Z80 Macro Assembler power supply (30A @ 8V, 15A @ get unprecedented storage capacity • Word Processing System +18 V, and 15A @ —18V) for cir- at this price-11 megabytes unfor- • Data Base Management cuitry you'll sooner or later want to plug into those free card slots. matted. with more coming all the time. You get speed—both in the 4MHz Z80A microprocessor and in the fast SMALL, RUGGED, RELIABLE CALL NOW 64K RAM which has a chip access With all its features the new Z-2H, With its high performance and low time of only 150 nanoseconds. You including its hard disk drive, is still price you KNOW this new Z-2H is get speed in the computer minimum housed in just one small cabinet. going to be a smash. Look into it instruction execution time of 1micro- right now. Contact your Cromemco second. You get speed in the hard computer store and get our sales disk transfer rate of 5.6 megabits/sec. literature. Find out when you can see it. Many dealers will be showing EXPANDABILITY the Z-2H soon—and you'll want to You get expandability, too. The be there when they do. high-speed RAM can be expanded to 512 kilobytes if you wish. And the computer has afull 12-slot PRESENT CROMEMCO USERS card cage you can use for additional We've kept you in mind, too. Ask RAM and interface cards. about the new Model HDD Disk Drive which can combine with your BROADEST SOFTWARE SUPPORT Hard disk drive at lower left can be inter- present Cromemco computer to give changed just by sliding out and disconnecting you up to 22 megabytes of disk With the Z-2H you also get the plug. Seven free card slots are available. storage. broadest software support in the Z-2H includes printer interface card. Cromemco in c or p or a t e d 280 BERNARDO AVE., MOUNTAIN VIEW, CA 94040 • (415) 964-7400 Tomorrow's computers now Circle 2 on reader service carda Electronics The International Magazine of Electronics Technology Vol. 52, No. 16 •August 2, 1979 41 Electronics Review Highlights COMMUNICATIONS: Echo-canceling chip opens up use of satellites, 41 RESEARCH: Panel calls for university R&D in materials, 42 Cover Maturing bubbles take diverse forms, 99 AUTOMOTIVE: Ford dashboards get electronic look, 43 The architectural options for magnetic BUBBLE MEMORIES: Bell Labs shows off 11.5 -megabit chip, 44 bubble memory devices represent compro- MANAGEMENT: RCA Solid State adds adash of Pepper. 46 SATELLITES: AT&T has chance at new services, 50 mises in access speeds, voltage require- NEWS BRIEFS: 50 ments, control-circuit complexities, and INTEGRATED CIRCUITS: Bipolar TRW chip has 1-jim linewidths, 52 packaging. As memory makers prepare to 65 Electronics International bring out 4-megabit and larger chips, they WEST GERMANY: Electronic unit optimizes fuel injection, ignition, 69 must meet these problems head on. EUROPE: Growing laser, optoelectronics markets indicated, 70 Cover photograph is by Don Carroll. JAPAN: Benefits of digital control come to one-loop systems, 72 GREAT BRITAIN: The British Post Office moves into fiber optics, 74 Changes likely in Communications Act, 88 83 Probing the News Rep. Lionel Van Deerlin (D., Calif.) has COMMUNICATIONS: Britain gambles on System X, 82 watered down his legislative proposals— Bell legislation takes a new tack, 88 COMPANIES: Growing pains for Zilog, 92 from complete replacement of the 1934 CONSUMER ELECTRONICS: Tape plays agrowth tune, 94 Communications Act to less ambitious 99 Technical Articles amendments. As a result, chances for MEMORY: Bubble memories come to the boil, 99 enactment by this Congress have improved. PACKAGING: 100,000 chips fit where 6,000 fit before, 109 DESIGNER'S CASEBOOK: Current source drives automatized loads, 116 Multilayer packaging meets LSI challenge, 109 Counter banks stagger radar's pulse rate, 117 Nine chips in single 23-layer carrier mounted Modulating the flyback inverter reduces supply's bulk, 119 on cards and boards with 7 to 16 layers SOLID STATE: ECL byte-slice parts attain system speeds, 120 COMMUNICATION: Data-encryption unit accesses memory directly, 126 increase chip density of IBM mainframe DATA ACQUISITION: Low-glitch d-a inverter lowers parts count, 131 computers more than 15 times. ENGINEER'S NOTEBOOK: Separating data, addresses on 488 bus, 136 8080 program counter makes relative jumps, 137 LSI lets ECL show its speed, 120 CALCULATOR'S NOTES: HP-25 program speeds cost estimates, 138 Emitter-coupled logic is faster than TTL at 141 New Products the gate level, but limited density has dimin- IN THE SPOTLIGHT: Capacitance meter spans nine ranges, 141 ished this advantage with interconnect DATA ACQUISITION: 4-bit a-d converter runs at 30 MHz, 144 delays. Fairchild's new 8-bit-slice mainframe COMPONENTS: Zinc oxide makes varistors better, 146 COMMUNICATIONS: CCD camera has high resolution, 150 parts give ECL its head. INSTRUMENTS: Logic-state analyzer has three clocks, 151 .. and in the next issue Departments Publisher's letter, 4 A special report on peripheral integrated Readers' comments, 6 circuits .. a direct-step-on-wafer reduc- Editorial, 12 ing photolithographic technique People, 14 Meetings, 30 Electronics newsletter, 35 Washington newsletter, 57 Washington commentary, 58 International newsletter, 65 Engineer's newsletter, 140 Products newsletter, 153 Services Employment opportunities, 154 Reprints available, 160 Reader service card, 163 Electronics/August 2, 1979 3 Electronics Publisher's letter A tantalizing glimpse of the future growth of the market may very well of new bubble memory technolo- be slowed by the lack of enough gy was provided at the recent Second experienced engineers.
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