Encyclopedia of Computer Science and Technology
eBook - ePub

Encyclopedia of Computer Science and Technology

Volume 2 - AN/FSQ-7 Computer to Bivalent Programming by Implicit Enumeration

  1. 494 pages
  2. English
  3. ePUB (mobile friendly)
  4. Available on iOS & Android
eBook - ePub

Encyclopedia of Computer Science and Technology

Volume 2 - AN/FSQ-7 Computer to Bivalent Programming by Implicit Enumeration

About this book

"This comprehensive reference work provides immediate, fingertip access to state-of-the-art technology in nearly 700 self-contained articles written by over 900 international authorities. Each article in the Encyclopedia features current developments and trends in computers, software, vendors, and applications...extensive bibliographies of leading figures in the field, such as Samuel Alexander, John von Neumann, and Norbert Wiener...and in-depth analysis of future directions."

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APL TERMINAL SYSTEM

OVERVIEW OF THE APL SYSTEM

One of the most popular concepts in the short history of computer and information technology is the APL terminal system—commonly referred to as APL and frequently pronounced “apple.” APL, which is an acronym based on the title of the book, A Programming Language, authored by the distinguished computer scientist K. E. Iverson, combines two advanced technological concepts: (1) an advanced programming language, and (2) the time-sharing mode of system operation. Time sharing is useful without the APL language and the APL language would be useful without time sharing. In combination, however, the two concepts provide the user with an extremely powerful computational facility. The APL system combines the simplicity of a desk calculator with the power of an automatic computer. APL is most useful for computer applications, large or small, to which a relatively fast response from the computer is needed.

APL and Time Sharing

APL combines a recent technique called time sharing with Iverson’s programming language to provide an interactive system that is appropriate for large and small problems and convenient for human use. Time sharing is a technique that allows several users at remote locations to concurrently use a computer via communications facilities. The system is accessed with a keyboard-type remote terminal device that is used for both input and output. The user types the information he wants sent to the computer and the computer responds, normally within seconds, with appropriate results. The discourse between the user and the computer is termed “interactive computing.”
Clearly, the computer can only execute one program at a time. Thus, to provide the above service concurrently to several users, the computer is programmed to operate in a time-sharing mode. When time sharing, the central computer gives each user a short b...

Table of contents

  1. Cover
  2. Half Title
  3. Title Page
  4. Copyright Page
  5. Table of Contents
  6. Contributors to Volume 2
  7. AN/FSQ-7 Computer
  8. Analog-Digital Conversion
  9. Analog Signals and Analog Data Processing
  10. Analysis of Variance
  11. And-or-Not-Nand-Nor Logic
  12. APL Terminal System
  13. Approximation Methods
  14. Argonne National Laboratory
  15. Arithmetic Operations
  16. ARPA Network
  17. Arrays
  18. Artificial Intelligence
  19. Artificial Languages
  20. ASCII Code
  21. Association for Computing Machinery (ACM)
  22. Associative Memories and Processors: A Description and Appraisal
  23. Astronomy
  24. Atomic Energy Commission (Energy Research and Development Administration)
  25. Audition
  26. Auerbach Corporations
  27. Autocorrelation
  28. Automata Theory
  29. Automatic Indexing: Progress and Prospects
  30. Automatically Programmed Tools—Numerically Controlled Machine Tools
  31. Automation
  32. Babbage, Charles
  33. Bivalent Programming by Implicit Enumeration