1985 – HP Journal Index

January 1985 v. 36 n.1

Cover: Miniature Optical Bench from the HP 8150A

Optical Stimulus and Receivers for Parametric Testing in Fiber Optics. An optical power source and an optical pulse power meter, both calibrated and programmable, provide reliable device and system testing for the expanding field of fiber optics, by Achim Eckert, Wolfgang Schmid, pg 4-7. 8150A, 8151A.

Handling Fiber Optic Components, by Wolfgang Schmid, pg 6

A Precise, Programmable 850-nm Optical Signal Source. Modulate the output using the internal pulse/function generator or your own external source, by Klaus Hoeing, Bernhard Flade, Wolfgang Schmid, Rainer Eggert, pg 7-18. 8150A.

Laser Safety Practices, pg 8

A Versatile, Programmable Optical Pulse Power Meter. There’s a choice of optical heads for operation at 550 to 950 nm or 950 to 1750 nm, by Werner Berkel, Michael Goder, Josef Becker, Wilfried Pless, Bernd Maisenbacher, Volker Eberle, Hans Huning, pg 18-27. 8151A, 81511A.

An Optical Receiver for 550 to 950nm. This versatile front end expands the measurement capabilities of electronic test equipment into the fiber optic domain, by Gerd Koffmane, Michael Fleischer-Reumann, Emmerich Muller, pg 27-29. 81519A, 8151A.

Optical Standards. Precise secondary standards had to be built to test a new line of instruments, by Joachim Vobis, Werner Berkel, pg 29-30. 8151A, 8150A.

Authors January 1985: Achim Eckert, Bernhard Flade, Wolfgang Schmid, Klaus Hoeing, Rainer Eggert, Hans Huning, Volker Eberle, Josef [Jo] Becker, Michael Goder, Bernd Maisenbacher, Wilfried Pless, Werner Berkel, Emmerich Muller, Michael Fleischer-Reumann, Gerd Koffmane, Joachim Vobis, pg 31-32

February 1985 v.36 n.2

Cover: Magnetostatic-wave delay-line filter

HP TechWriter: Illustrated Documents for Engineers. This document editing software package for HP 9000 Series 200 Computers electronically merges text with pictures from many HP graphics software packages. Text and graphics appear on the screen as they will in the printed document, by Roy E. Anderson, Elaine C. Regelson, pg 4-9

HP TechWriter Security, pg 8

Magnetostatic-Wave Devices for Microwave Signal Processing. By locally perturbing the magnetic dipoles formed by spinning electrons in thin ferrimagnetic films, a propagating wave can be initiated. Devices based on this principle can be used to process microwave signals, by Waguih S. Ishak, Kok-Wai Chang, pg 10-20. MSW, YIG.

Magnetic Resonance and YIG-Sphere Devices, pg 12

Spin Waves and Magnetostatic Waves, pg 14

Disc Caching in the System Processing Units of the HP 3000 Family of Computers. Disc caching uses the excess main memory and processor capacity of the high-end HP 3000s to eliminate a large portion of the disc access delays encountered in an uncached system, by Alan J. Kondoff, John R. Busch, pg 21-39

Disc Cache Performance Tools, pg 23-24

The MPE-IV Kernel, pg 25

Authors February 1985: Roy E. Anderson, Elaine C. Regelson, Waguih S. Ishak, Kok-Wai [Bill] Chang, John R. Busch, Alan J. Kondoff, pg 40

March 1985 v.36 n.3

Cover: HP Maintenance Management, a software package for the HP 3000 Computer

HP Maintenance Management: A new Approach to Software Customer Solutions. Suggested by an HP customer and designed with extensive customer feedback, this HP 3000 software helps cut the cost of equipment maintenance, by Joseph L. Malin, Irving Bunton, Jr., pg 4-10

The Need for Plant Maintenance, pg 9

Development of High-Performance, Half-Inch Tape Drive. The design of a low-cost, high-density tape drive for backup of large amounts of on-line computer system memory requires a sophisticated combination of technologies and careful project planning. This new drive’s greatly improved reliability reduces maintenance costs and downtime, by Richard T. Turley, Hoyle L. Curtis, pg 11-16. 7978A.

LSI Simplifies Tape Drive Electronic Design, by Jimmy L. Shafer, pg 13

System Integration, by Richard T. Turley, pg 15

Write and Read Recovery Systems for a Half-Inch Tape Drive. Besides the necessary erasing, reading and writing functions, it is important to protect the data from accidental alteration or destruction, by Wayne T. Gregory, pg 16-18. 7978A.

Digital Formatting and Control Electronics for Half-Inch Tape Data Storage. Encoding and decoding data transparently in either GCR or PE formats require fairly complex operations. LSI circuits simplify some of the design problems, by Jimmy L. Shafer, 19-24. 7978A.

Streaming Tape Drive Hardware Design. Two microprocessors are required – one for master control and the other for servo control, by David J. Van Maren, Robert D. Emmerich, John W. Dong, pg 25-29. 7978A.

Firmware for a Streaming Tape Drive. Support of queued operations keeps the tape streaming and handles all interactions with the user or the host computer, by Alan J. Richards, John A. Ruf, Bradfred W. Culp, Virgil K. Russon, David W. Ruska, pg 29-31. 7978A.

Authors March 1985: Irving [Irv] Bunton, Jr., Joseph [Joe] L. Malin, Hoyle L. Curtis, Richard [Rick] T. Turley, Wayne [Tom] T. Gregory, Jimmy [Jim] L. Shafer, Robert [Diamond Bob] D. Emmerich, John W. Dong, David [Dave] J. Van Maren, David [Dave] W. Ruska, Bradfred [Brad] W. Culp, Virgil K. Russon, John A. Ruf, Alan J. Richards, Sterling J. Mortensen, Donald [Don] A. DiTommaso, John C. Becker, Craig L. Miller, K. Douglas [Doug] Gennetten, Mark E. Wanger, David [Dave] J. Schmeling, Walter [Walt] L. Auyer, Charles [Chuck] H. McConica, Mark L. Gembarowski, pr 31-33

Low-Cost, Highly Reliable Tape Backup for Winchester Disc Drives. Designed for use on small to midrange computer systems, this new quarter-inch cartridge tape drive packs up to 67 megabytes onto a single cartridge, by Donald A. DiTommaso, Sterling J. Mortensen, John C. Becker, pg 34-36. 9144A.

A Design Methodology for Today’s Customers, by Donald A. DiTommaso, pg 36

Tape/Disc Controller Serves Integrated Peripherals. A fixed disc drive or a quarter-inch tape drive or both can operate in a common environment, by Craig L. Miller, Mark L. Gembarowski, pg 37-39. 9144A.

Cartridge Tape Data Integrity Ensured at Five Levels. The drive has read after write, error correction, and media monitoring capabilities, by K. Douglas Gennetten, pg 39-43. 9144A.

Controlling the Head/Tape Interface. It’s critical to data integrity and unit-to-unit interchangeability, by Charles H. McConica, David J. Schmeling, Mark E. Wanger, Walter L. Auyer, pg 44-47. 9144A.

Software Methodology Preserves Consistency and Creativity. Concepts used include hierarchy charts, structured programming, top-down design, structured walkthroughs, and structured analysis, by Mark L. Gembarowski, pg 47-48. 9144A.

April 1985  v.36.n.4

Cover: HP 2392A Display Terminal

A Low-Cost Compact, Block-Mode Computer Terminal. The design emphasizes ergonomics and very high reliability as well as low cost and compactness, by Michele Prieur, Jean-Louis Chapuis, pg 4-7. 2392A.

A Reliable, Low-Cost Keyboard Interface, by Khambao Panyasak, pg 7

Mechanical Design of a Low-Cost Terminal. Integral display tilt and swivel mechanisms and a detached low-profile keyboard help it adapt to users’ needs, by Michel Cauzid, pg 8-9. 2392A.

VLSI Design in the HP 2392A Terminal. The cost of the CRT control function was reduced by 80% by integrating it in a single VLSI chip, by Jean-Jacques Simon, pg 9-16

A Fast Gate Array Companion for CRT Controller, by Freddie Barbut, pg 13-14

How to Scroll Smoothly, by Richard Brabant, pg 15-16

Fully Automated Production of Display Terminal Printed Circuit Assemblies. DIP and axial inserters install 103 components and a six-axis robot inserts 41 more, by Christian-Marcel Dulphy, pg 16-17. 2392A.

A Low-Cost, Reliable Analog Video Display Terminal Design. A small cabinet with no fan made heat dissipation a major concern, by Rene Martinelli, Jean Yves Chatron, pg 18-22. 2392A.

Authors April 1985: Jean-Louis Chapuis, Michele Prieur, Michel Cauzid, Jean-Jacques Simon, Christian-Marcel Dulphy, Jean-Yves Chatron, Rene Martinelli, Martin L. Stone, Todd L. Russell, Peter L. Ma, Jeffrey [Jeff] W. Groenke, Hatem E. Mostafa, Tammy V. Herr, David [Dave] C. Tribolet, Kenneth [Ken] A. Regas, Thomas [Tom] J. Halpenny, pg 23-24

An Intelligent Plotter for High-Throughput, Unattended Operation. This plotter quickly produces multiple copies of high-quality graphics output for use in presentations and reports. Its high throughput and automatic cut-sheet feeder make it useful for unattended operation in shared environments, by Todd L. Russell, Peter L. Ma, Jeffery W. Groenke, Martin L. Stone, pg 25-29. 7550A.

Low-Mass, Low-Cost Pen-Lift Mechanism for High-Speed Plotting. An adaptive pen up/down cycle reduces pen nib wear without sacrificing plotting speed, by Tammy V. Herr, Hatem E. Mostafa, pg 29-30. 7550A.

The HP 7550A X-Y Servo: State-of-the-Art Performance on a Budget. A 32-bit microprocessor closes three servo loops in this plotter using position and velocity feedback, by Kenneth A. Regas, Thomas J. Halpenny, David C. Tribolet, pg 31-34

Firmware Provides Simple and Powerful Plotter Operation. Polygon area fill, downloadable character sets, and replot and vector buffers are some of the key enhancements, by Thomas J. Halpenny, pg 34-36. 7550A.

May 1985 v.36 n.5

Cover: a closeup view of the orifice plate of a HP’s ThinkJet printer

History of Thinkjet Printhead Development. The principle was simple: ejecting a minute droplet of ink by momentarily boiling the ink. Applying it to the design of a commercially viable disposable ink-jet printhead required clever and persistent engineering, by Niels Nielsen, pg 4-10

Mass-Producing Thermal Ink-Jet Printheads, pg 7

Preventing Hydraulic Crosstalk, pg 9

An Inexpensive, Portable Ink-Jet Printer Family. Using a disposable ink cartridge and printhead, this low-cost family of printers offers personal computer users high-quality printing in a portable package. Four common I/O interfaces are supported by various members of the family, by Thomas R. Braun, Cheryl V. Katen, pg 11-20. ThinkJet, 2225.

Alignment of Bidirectional Text, by Dave Lowe, Robert P. Callaway, pg 13

Printhead Interconnect, by Roy T. Buck, pg 14

Custom VLSI Microprocessor System, by Ray L. Pickup, pg 16

Home Switch Design, by Andrew D. Sleeper, pg 18-19

Thermodynamics and Hydrodynamics of the Thermal Ink Jets. Clever modeling and computer simulations were done to understand and predict the behavior of a new printing device, by Ross R. Allen, William R. Knight, John D. Meyer, pg 21-27. ThinkJet.

Development of the Thin-Film Structure for the ThinkJet Printhead. Using microscopic thin-film devices to vaporize ink for ink-jet printing imposes severe electrical, thermal, mechanical and chemical stresses on the film structures, by Eldurkar V. Bhaskar, J. Stephen Aden, pg 27-33

Where the Ink Hits the Paper…, by David Hackleman, pg 32

The ThinkJet Orifice Plate: A Part with Many Functions. This tiny electroformed part conducts ink from the reservoir and channels it to an array of integral minute orifices where it is selectively vaporized to eject ink droplets for printing, by Gary L. Siewell, William R. Boucher, Paul H. McCleland, pg 33-37

Electroforming, pg 35

Viewpoints: Managing the Development of a New Technology. How you do it may determine the commercial viability of a breakthrough technology, by Frank L. Cloutier, pg 38-39

Authors May 1985: Niels J. Nielsen, Thomas [Tom] R. Braun, Cheryl V. Katen, William [Bill] R. Knight, Ross R. Allen, John D. Meyer, Eldurkar V. Bhaskar, J. Stephen [Steve] Aden, Paul H. McClelland, William [Bill] R. Boucher, Gary L. Siewell, Frank L. Cloutier, pg 39-40

June 1985 v.36 n.6

Cover: Dot matrix printbar in action

A New Family of Dot Matrix Line Printers. These impact printers are designed for EDP and manufacturing applications. Speeds available are 300, 600, and 900 lines per minute, by Bryce E. Jeppsen, pg 4-6. 2563A, 2565A, 2566A.

Design for Reliability in the HP 256X Family of Line Printers, by Everett M. Baily, pg 5

Dot Matrix Printbar Design and Manufacturing. A new captured-hammer printbar system meets performance needs from 300 to 900 lines per minute, by John S. Craven, pg 6-9. 256X.

Shuttle System and Packaging of Low-Cost, High-Reliability, 300-lpm Line Printer. Simplicity and reliability were the overriding design requirements, by Jeffrey M. Lantz, Ben B. Tyson, pg 9-12. 2563A.

Mechanical Design of a Family of High-Speed Impact Line Printers. Dot placement accuracy must be maintained with the printbar oscillating at 60 Hz and the paper moving at 900 lpm, by George V. McIlvaine, Daniel D. Wheeler, Peter Gysling, Stephen L. Testardi, pg 13-18. 2365A, 2566A.

Computer Modeling of a Paper Drive Mechanism, by Peter Gysling, pg 15-16

Resonance Search Technique, by Gary W. Green, pg 17

Cost-Effective, Versatile Line Printer Electronics and Firmware. Here’s the nerve center that does the formatting, sequencing, controlling and communicating, by Phillip R. Luque, Donald K. Wadley, Philip Gordon, 18-23. 256X.

Vector Graphics for Dot Matrix Printers, by Sharon E. Jones, Alvin D. Scholten, pg 20

Printer Command Language Provides Feature Set Standard for HP Printers. Now applications written for one HP printer won’t have to be rewritten to run on another, by Ernest F. Covelli, David L. Price, Von L. Hansen, pg 23-25. PCL.

Authors June 1985: Bryce E. Jeppsen, John S. Craven, Ben B. Tyson, Jeffrey [Jeff] M. Lantz, Daniel [Dan] D. Wheeler, Peter [Pete] Gysling, George V. McIlvaine, Stephen [Steve] L. Testardi, Donald [Don] K. Wadley, Philip [Phil] Gordon, Phillip [Phil] R. Luque, David [Dave] L. Price, Ernest [Ernie] F. Covelli, Von L. Hansen, Harry E. Kellogg, Jonathan [Jon] E. Bale, pg 25-26

Native Language Support for Computer Systems. NLS for the HP 3000 and other HP computers provides hardware and operating system facilities that make application programs easy to translate into other languages, by Jonathan E. Bale, Harry E. Kellogg, pg 27-32. Localization.

Native Language Collating Sequences for Europe, pg 30

July 1985 v.36 n.7

Cover: HP 4953A Protocol Analyzer (illustrated map)

A Protocol Analyzer for EDP Centers and Field Service. It’s the latest member of a family that also includes a low-cost portable analyzer for field service and a high-speed BASIC-programmable analyzer for data communications research and development, by Aileen C. Appleyard, Roger W. Ruhnow, William Grant Grovenburg, Wayne M. Angevine, pg 4-11. 4955A, 4951A, 4953A.

How Protocol Analysis Can Help, pg 5

Protocol Analyzer Software Development, by William Grant Grovenburg, pg 10

Simple Architecture Provides High Performance for Protocol Analysis. A 68000 microprocessor controls the system. A trap machine provides powerful triggering capabilities, by Roger W. Ruhnow, Stephen H. Witt, pg 12-18. 4953A.

Protocol Analyzer Power Supply Design, by Stephen M. Ernst, pg 14

Protocol Analyzer Mechanical Design, by Ken Krebs, pg 15

Making a Protocol Analyzer Producible and Serviceable, by John R. Rader, pg 17

Serial Data Acquisition and Simulation for a High-speed Protocol Analyzer. The front end is a dedicated processor that interfaces the line under test to the system processor, by Dorothy J. Yackle, Mark D. Keisling, Elizabeth Gates Moore, David B. Karlin, pg 18-24. 4953A.

A Low-Cost, Portable Field Service Protocol Analyzer. It’s menu and file compatible with HP’s higher-performance analyzers and has many of the same capabilities, by Vonn L. Black, Alan Delwiche, Stephen B. Tursich, Chris L. Odell, pg 24-29. 4951A.

Remote Monitoring and Control of Semiconductor Processing. This addition to HP’s Semiconductor Productivity Network acts as a host computer to IC processing equipment, providing remote control and data gathering for fabrication personnel, by Wesley H. Higaki, pg 30-34. SPN.

SECS, pg 33. SEMI Equipment Communications Standard.

Authors July 1985: William Grant Grovenburg, Aileen C. Appleyard, Wayne M. Angevine, Roger W. Ruhnow, Stephen [Steve] H. Witt, Elizabeth [Beth] Gates Moore, David [Dave] B. Karlin, Mark D. Keisling, Dorothy [Dotty] J. Yackle, Alan Delwiche, Vonn L. Black, Chris L. Odell, Stephen [Steve] B. Tursich, Wesley [Wes] H. Higaki, pg 35-36

August 1985 v. 36 n.8

Cover: Spectrum of HP’s next generation of computers ranging from desktop workstations to mainframe class machines

Beyond RISC: High-Precision Architecture. An introduction to scaling, complexity and HP’s new computer architecture, by William S. Worley, Jr., Joel S. Birnbaum, pg 4-9. Spectrum program.

Architecture Genealogy, pg 5

Authors August 1985: William [Bill] S. Worley, Jr., Joel S. Birnbaum, Michael [Mike] B. Aken, William [bill] M. Spaulding, David [Dave] A. Bartle, Katherine [Katie] F. Potter, Reed I. White, pg 10

Development of a Two-Channel Frequency Synthesizer. Combining two independent synthesizers, flexible modulation, and control circuits in a single package, this instrument can generate two-phase, two-tone, pulse, frequency hopping, and swept signals, by Michael B. Aken, William M. Spaulding, pg 11-18. 3326A.

Discrete Sweep, by Michael B. Aken, pg 15

Two-Channel Synthesizer Phase Calibration, by Michael B. Aken, pg 17

Applications of a Two-Channel Synthesizer. Multiphase test capability, a frequency agile discrete sweep and other features add up to exceptional versatility, by Michael B. Aken, pg 19-21. 3326A.

Measuring Intermodulation Distortion with a Two-Channel Synthesizer, by Ben Zarlingo, pg 20

Synthesizer Firmware for User Interface and Instrument Control. A friendly and reliable user interface was the primary objective, by Katherine F. Potter, David A. Bartle, pg 21-24. 3326A.

A High-Level Active Mixer. When noise considerations are properly addressed, active designs have some distinct advantages, by William M. Spaulding, pg 25-29. 3326A.

Automated Test Data Collection for IC Manufacturing. Collecting, storing and analyzing data from a variety of test equipment and CPUs that use different formats, languages, and protocols is made possible by this software product for HP’s Semiconductor Productivity Network, by Reed I. White, pg 30-36. SPN.

EA-10 Data Analysis System, pg 32

September 1985 v.36 n.9

Cover: HP 3000 Series 37 Computer

VLSI Delivers Low-Cost, Compact HP 3000 Computer System. This entry-level, user-installable computer system runs the same software as the largest HP 3000, but fits under a table and is much quieter than a typewriter, by Frank E. La Fetra, Jr., James H. Holl, pg 4-7. Series 37.

High-Volume Test Strategy, by Dennis Bowers, pg 6

Simplicity in a Microcoded Computer Architecture. Simplicity means more efficient use of silicon without sacrificing performance, by Frederic C. Amerson, pg 7-12. HP 3000 Series 37

Using a Translator for Creating Readable Microcode, by Skip La Fetra, pg 10

Booting 64-Bit WCS Words from a 32-Bit-Wide ROM Word, by Skip La Fetra, Chris Shaker, pg 12

Simulation Ensures Working First-Pass VLSI Computer System. A simulator with the improbably name “Faster Than Light” was the essential tool, by John R. Obermeyer, Malcolm E. Woodward, Paul L. Rogers, Patria G. Alvarez, Greg L. Gilliam, pg 13-16. HP 3000 Series 37.

Creative Ways to Obtain Computer System Debug Tools. The ways include an off-the-shelf microcomputer and a virtual software debugging panel, by William M. Parrish, Eric B. Decker, Edwin G. Wong, pg 17-22. HP 3000 Series 37.

The Role of a Programmable Breakpoint Board, by Mehraban Jam, pg 20

Virtual Microcode Memory, by Chris Shaker, pg 22

New Cardiograph Family with ECG Analysis Capability. These three new HP cardiographs, in addition to recording traditional ECG waveforms, can perform differing levels of measurements and analysis to aid diagnosis of heart behavior, by Peter H. Dorward, Steven A. Scampini, Robert H. Banta, Jr., pg 23-28. 4760.

ECG Storage and Transmission, by Charles C. Monroe, pg 24

Artifact Indication, pg 27

Computer-Aided ECG Analysis. Special signal processing and algorithms are required to detect various ECG abnormalities, by John C. Doue, Anthony G. Vallance, pg 29-34

ECG Criteria Language, pg 30-31

Pediatric Criteria, pg 34

Authors September 1985: Frank [Skip] E. La Fetra, Jr., James [Jim] H. Holl, Frederic [Rick] C. Amerson, Paul L. Rogers, Malcom [Woody] E. Woodward, Patria [Pat] G. Alvarez, John R. Obermeyer, Greg L. Gilliom, Edwin [Ed] G. Wong, William [Bill] M. Parrish, Eric B. Decker, Peter H. Dorward, Steven [Steve] A. Scampini, Robert [Bob] H. Banta, Jr., Anthony [Tony] G. Vallance, John C. Doue, pg 35-36

October 1985 v.36 n.9

Cover: Integral PC’s electroluminescent display

A Multitasking Personal Computer System for the Technical Professional. The Integral PC provides high-performance multitasking operation, mass storage, graphics and text output, and instrument I/O in a compact, transportable package, by Nelson A. Mills, Tim J. Williams, pg 4-6

Electronics System for a Transportable Computer. A clever memory manager and simple, low-cost system logic design are key elements, by David L. Kepler, James A. Espeland, pg 6-9. Integral PC.

Custom Graphics Processor Unit for the Integral PC. This special-purpose microprocessor can control the internal bit-mapped flat-panel display or external CRT monitors, by Dean M. Heath, pg 10-12

High-Quality Electroluminescent Display for a Personal Workstation. An energy-recovery drive scheme keeps power requirements below 15 watts, by Marvin L. Higgins, pg 12-17. Integral PC.

Mechanical Design of the Integral PC: Not Just Desktop Computer with a Handle. Able to fit under an airline seat, the package contains an ink-jet printer, a disc drive, a detachable keyboard, and space for an optional mouse, by Thomas A. Pearo, pg 18-22

Reducing Glare with Circular Polarizers, pg 21

A UNIX Operating System Adapted for a Technical Personal Computer. This approach eliminates the need for a hard disc and adds real-time priority to a multitasking operating system, by Ray M. Fajardo, Robert C. Cline, James R. Andreas, Andrew L Rood, pg 22-28. Integral PC.

A Friendly UNIX Operating System User Interface. A window manager and an adaptation of the Personal Applications Manager used in the HP 150 Computer make it simpler for the novice to use a UNIX multitasking system, by Jon A. Brewster, Karen S. Helt, James N. Phillips, 28-33. Integral PC.

Personal Applications Manager, by Brock Krizan, pg 30

Data Communications, by Fred Taft, pg 33-34

Printer and Plotter Drivers, pg 34-35

Authors October 1985: Nelson A. Mills, Tim J. Williams, James [Jim] A. Espeland, David [Dave] L. Kepler, Dean M. Heath, Marvin [Marv] L. Higgins, Thomas [Tom] A. Pearo,  James [Jim] R. Andreas, Andrew [Andy] L. Rood, Robert [Bob] C. Cline, Ray M. Fajardo, Karen S. Helt, James [Jay] N. Phillips, Jon A. Brewster, pg 35-36

November 1985 v.36 n.11

Cover: A Thin-film disc fabricated in the HP Laboratories

Thin-Film Memory Disc Development. Developing a new recording medium for disc memories required careful attention to the development and characterization of materials, processes and test systems, by Bruce F. Spenner, Charles C. Morehouse, David J. Bromley, Edward S. Murdock, Richard A. Baugh, James E. Opfer, Bangalore R. Natarajan, pg 4-10

M-H Loop Measurements, by Robin P. Giffard, Victor W. Hesterman, pg 6

A Laser Particle Scanner, by Richard E. Elder, pg 8

Dynamic Testing of Thin-Film Magnetic Recording Discs. A modular approach is a key element, by John Hodges, Keith S. Roskelley, Dennis R. Edson, pg 11-21

In-Line Sputtering Deposition System for Thin-Film Disc Fabrication. A sophisticated control system and physical design moves the discs from one deposition step to the next without exposing the discs to atmospheric conditions between steps, by George A. Drennan, Michael B. Jacobson, Robert J. Lawton, pg 21-25

Thin-Film Disc Reliability-the Conservative Approach. Wear, friction, and corrosion must be evaluated and controlled, by Stephan P. Howe, Paul Poorman, Clifford K. Day, C. Girvin Harkins, pg 25-31

Authors November 1985: David [Dave] J. Bromley, Charles [Chuck] C. Morehouse, Richard [Dick] Baugh, Edward [Ed] S. Murdock, James [Jim] E. Opfer, Bruce F. Spenner, Bangalore [Natu] R. Natarajan, John Hodges, Dennis R. Edson, Keith S. Roskelley, Robert [R. J. (Bob)] Lawton, Michael [Mike] B. Jacobson, George A. Drennan, C. Girvin Harkins, Stephan P. Howe, Clifford [Cliff] K. Day, Paul Poorman, Darrel R. Bloomquist, Richard [Rick] S. Seymour, Glenn E. Moore, Jr., Michael [Mike] C. Allyn, Peter R. Goglia, Scott R. Smay, pg 31-33

Manufacturing Thin-Film Discs. Optimizing disc fabrication has a major effect on disc drive product cost and quality, by Darrel R. Bloomquist, Glenn E. Moore, Jr., Richard S. Seymour, pg 34-35

Thin-Film Discs: Magnetic, Electrical, and Mechanical Design. When the magnetic and electrical parameters require a head to fly only 200 nm above a disc, surface smoothness becomes an important design parameter, by Michael C. Allyn, Peter R. Goglia, Scott R. Smay, pg 36-40

December 1985 v.36 n.12

Cover: SAWR and the HP 8642A/B

A High-Performance Signal Generator for RF Communications Testing. High-reliability design, extended calibration intervals, and fast calibration and repair maximize ATE system uptime. Spectral purity is exceptional, by Robert E. Burns, pg 4-6. 8642A, 8642B.

User Interface and Internal Controller for an RF Signal Generator. The power of a 68000 microprocessor makes the instrument friendly, both to the user and to automatic systems it may be part of, by Albert Einstein Lassiter, Charles R. Kogler, pg 6-9. 8642A/B.

Display Design, pg 9

Signal Generator Service Features Maximize Uptime. Built-in are self-tests and service features for fault location and field recalibration, by Michael T. Wende, pg 10-13. 8642A/B.

Electrically Erasabel PROM Storage for Calibration Data, pg 13

Internally Modular Signal Generator Mechanical Design. Each module is like a mini-instrument that is easily replaceable in the field, by Michael B. Jewell, Mark W. Johnson, pg 14-18. 8642A/B.

Wide-Frequency-Range Signal Generator Output Section Design. Output power amplification and control, amplitude modulation, and reverse power protection are handled here, by Marvin W. Wagner, Robert R. Collison, James B. Summers, Bryan D. Ratliff, pg 18-24. 8642A/B.

Signal Generator Frequency Synthesizer Design. Six phase-locked loops minimize phase noise and spurious outputs and provide high-accuracy, low distortion angle modulation, by Thomas R. Faulkner, Earl C. Herleikson, Ronald J. Mayer, Brian M. Miller, Mark A. Niemann, pg 24-31. 8642A/B.

Computer Analysis of Oscillator Loop Gain, Phase, and Q, pg 29

Audio Modulation Section for an RF Signal Generator. Included is a low-distortion, variable-modulation audio signal source, by Gary L. Tong, pg 31-35 . 8642A/B.

Index: Volume 36 January 1985 through December 1985. PART 1: Chronological Index, pg 36-37. PART 2: Subject Index, pg 38-40. PART 3: Model Number Index, pg 40. PART 4: Author Index, pg 41-42

Authors December 1985: Robert [Bob] E. Burns, Albert Einstein Lassiter, Charles [Chuck] R. Kogler, Michael [Mike] T. Wende, Mark W. Johnson, Michael [Mike] B. Jewell, Bryan D. Ratliff, Marvin [Marv] W. Wagner, Robert [Bob] R. Collison, James [Jim] B. Summers, Earl c. Herleikson, Ronald [Ron] J. Mayer, Brian M. Miller, Mark A. Niemann, Thomas [Tom] R. Faulkner, Gary L. Tong, pg 43-44