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DATA COMMUNICATIONS,1 AS OUR INDUSTRY USES THE TERM, INVOLVES THE EQUIPMENT OR SERVICES USED IN THE FLOW OF INFORMATION TO OR FROM A COMPUTER CENTER, WHERE A COMPUTER MUST HAVE A PART IN PROCESSING THE INFORMATION TRANSMITTED. IT IS NOT SIMPLY THE TRANSMISSION OF DATA FROM ONE SOURCE TO ANOTHER.
THIS PAPER DESCRIBES THE IMPLEMENTATION OF A COMMUNICATIONS SOFTWARE SYSTEM WITH VERY MANY GENERAL PURPOSE FEATURES. THIS SYSTEM ALSO POSSESSES CLEARLY DEFINED INTERFACES TO THE OPERATING SYSTEM.
The ISP (instruction Set Processor) notation was developed1 to precisely describe the programming level of a computer. The behavior of a processor is determined by the nature and sequence of its operations. This sequence is given by a set of bits in primary memory (a program) and a set of interpretation rules (usually in the central processor). Thus, if we specify the nature of the operations and...
The use of hardware description languages in British industries and universities is presented here, including both linguistic and graphical forms of representation.
A digital system can be described at several levels. 1) The highest level is the algorithmic level which specifies only the algorithm to be used for solving a design problem. 2) The second level is the PMS (Processor, Memory, Switch) level which describes a system by processors, memory components, peripheral units, and switching networks. 3) The instruction level describes the instructions of a computer...
Technische Hochschule Darmstadt Beginning in 1968, the author and his coworkers designed a register transfer language in three versions: RTS I, RTS II, and RTS III. Based on the work of Reed, Schlaeppi, Chu, and Duley, these versions have been used to describe behavior and structure of digital systems in courses on switching circuits and computer organization.
Most French manufacturers have been using computer languages to describe logic circuits and microprograms and to simulate them in order to check out computer designs. Several languages have been developed at the Compagnie des Machines Bull1 and at the Compagnie C.A.E.2 More recently, the Compagnie Telemecanique Electrique has developed a macrolanguage for describing and generating microprogram sequences...
Many design automation systems have been widely used for developing computers; however, the scope of their application is limited to the areas such as generating wiring lists, printed card board patterns, LSI mask patterns, or test patterns for checking out logic and component faults. It has been difficult to develop an automatic design system for computer architecture, essentially because that area...
In Canada, interest in hardware description languages (HDLs) has been mainly centered in the universities, and their principal use has been to help the teaching of computer architecture courses. Working compiler/simulator installations are located at Waterloo, Ecole Polytechnique (Montreal), Toronto, and New Brunswick; in each case the system is for Professor Chu's CDL running on IBM/360. Other universities...
AHPL (A Hardware-Programming language) is a hardware description language based on the notational conventions of APL. AHPL makes use of only those APL operations which can be readily interpreted as hardware primitives. A few special conventions have been added to AHPL to represent unique hardware capabilities such as parallel control sequences and asynchronous and conditional transfers. No attempt...
The Second Annual Workshop on Computer Hardware Description Languages sponsored by the German chapters of the IEEE Computer Society and ACM was held in Darmstadt, Federal Republic of Germany, from July 31 to August 2, 1974. Addressing the task begun at the first workshop held at Rutgers University a year ago, this workshop continued the effort to establish a digitial system description language. Whereas...
If “hardware” consists of transistors, integrated circuits, solder, copper, glass epoxy board, etc., then anything placed on paper to describe hardware is a model. A great variety of models have been and continue to be used for a variety of purposes. We analyze models; we synthesize models; we communicate with others and computing machines via models. Some models such as circuit schematics, mechanical...
This book deals primarily with the simulation of hardware systems such as those found in the aeronautical and aerospace industries where differential equations represent the system dynamics. Usually there are known representations of such systems, and because of the nonlinearities, or the need for system identification, simulation must be used to see how components interact and to design them to achieve...
The set of design tools and practices collectively known as "design automation" had its origin twenty years ago. The evolution of these practices as applied to the design of digital computers is nicely described by Preiss.<R>1</R> Since its inception, this field has expanded to include not only computer design, but also such diverse items as office space planning, ship building,...
In early 1973 the Computer Programming Laboratory of Hughes Aircraft Company decided to utilize structured programmning on a medium-sized (12 programmers) real-time system. The system, which was coded in CMS-2Y (MOD 8), ran on the UNIVAC AN/UYK-7 and had extensive hardware and interactive operator interfaces. In addition to the use of structured coding techniques, the software was developed using...
Upgrading to a newer data processing system is not simply a matter of removing the old equipment and plugging in the new. The older system's workload must be transferred to the newer one/p=n-/and the newer one is usually also a fundamentally different one. The effort involved in such a conversion is massive. The difficulties of obtaining a smooth transition from one machine to the next are immense.
For a number of years computer peripherals have been recognized as bottlenecks in the computer performance race, and computer output hardcopy devices have been leading offenders.
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