Teletype 4400 Series Data Terminals
Total Page:16
File Type:pdf, Size:1020Kb
Load more
Recommended publications
-
The Future of Human-Computer Interaction: Overview of Input Devices
The future of human-computer interaction: overview of input devices Fabrizio Fornari School of Computer Science H´ask´olinn´ıReykjav´ık- Reykjav´ıkUniversity Reykjav´ık,Iceland November, 2012 Abstract We are in 2012 and we are still using the mouse and the keyboard to interact with a computer. We have seen a lot of changes in the world of Computer Science, relating to: performance, design and the way we interact with the computer. Differ- ent input devices have been developed around the computer, starting from the most recent touchscreens, continuing with webcams, microphones, and arriving to the oldest mice and keyboards. The aim of this research is to let the reader imagine a new way to interact with the computer. To reach our purpose, we introduce advanced technologies such as: Speech and Voice Recognition, Electronic Perception, Eye Tracking and Brain Computer In- terfaces. We propose examples of the cited technologies that may change the paradigm that saw, until now, keyboard and mouse as leaders of the input devices. 1 1 Introduction From the computer's birth1, we saw a lot of changes in the world of Com- puter Science. Changes relating to: performance, design and human-computer interaction [49]. A few years ago, the words \input device" evoked in our mind only two specific objects: the keyboard and the mouse - the main instruments used to provide data to a personal computer. Keyboard and mouse are, in fact, two of the first input devices in the history of computer. Nowadays, with the evolution of computers, we have a large set of input de- vices that changed the way we interact with the computer. -
A Secure Peer-To-Peer Web Framework
A Secure Peer-to-Peer Web Framework Joakim Koskela Andrei Gurtov Helsinki Institute for Information Technology Helsinki Institute for Information Technology PO Box 19800, 00076 Aalto PO Box 19800, 00076 Aalto Email: joakim.koskela@hiit.fi Email: andrei.gurtov@hiit.fi Abstract—We present the design and evaluation of a se- application, that can be deployed without investing in dedi- cure peer-to-peer HTTP middleware framework that enables cated infrastructure while addressing issues such as middlebox a multitude of web applications without relying on service traversal, mobility, security and identity management. providers. The framework is designed to be deployed in existing network environments, allowing ordinary users to create private II. PEER-TO-PEER HTTP services without investing in network infrastructure. Compared to previous work, scalability, NAT/firewall traversal and peer From its launch in the early 1990s, the HyperText Transfer mobility is achieved without the need for maintaining dedicated Protocol (HTTP) had grown to be one of the most popular servers by utilizing new network protocols and re-using existing protocols on the Internet today. It is used daily for everything network resources. from past-time activities, such as recreational browsing, gam- I. INTRODUCTION ing and media downloads, to business- and security-critical Peer-to-peer (P2P) systems have been popular within net- applications such as payment systems and on-line banking. work research during the past years as they have the potential The success of HTTP has clearly grown beyond its original to offer more reliable, fault-tolerant and cost-efficient network- design as a simple, easy to manage protocol for exchanging ing. -
I.L. 40-614A 1 1. INTRODUCTION the Basic Interface to Remote Terminal, Or BIRT, Is an INCOM Network Master. BIRT Gives Users An
I.L. 40-614A 1. INTRODUCTION 3. DESCRIPTION The Basic Interface to Remote Terminal, or BIRT, is 3.1. Power Requirements an INCOM Network Master. BIRT gives users an economical way of getting information from their Range: 48 Vdc to 250 Vdc and 120 Vac INCOM-compatible devices since it connects directly between a user’s external MODEM or personal com- Burden: 3.5 W @ 48 Vdc puter and the INCOM network. 9 W @ 250 Vdc 5 W @ 120 Vac BIRT can directly replace Westinghouse MINTs, talk- ing to all INCOM-based communication devices. 3.2. Temperature Range BIRTs also include a special high-speed mode for communicating with SADIs – allowing users to collect For Operation: 0˚ to +55˚ C data from other manufacturer’s relays more rapidly For Storage: -20˚ to +80˚ C than ever before. 3.3. Physical Dimensions BIRTs are built to handle the abuse of substation environment; their “hardened” RS-232 serial port can The BIRT enclosure dimensions are identical to the handle surges and sustained high voltages that ERNI and SADI, as shown in figure 1. would destroy ordinary serial ports, and BIRTs can run on a wide range of voltages, from 48 to 250 Vdc Dimensions and weight of chassis or even 120 Vac, with no jumpers or adjustments needed. Height: 5.26” (133.6) mm) Width: 3.32” (84.3) mm) Depth: 5.92” (150.4) mm) 2. FEATURES Weight: 2.0 lbs (0.9 kg) BIRT is designed to be very flexible in its RS-232 External Wiring: See figures 2 and 3. -
Introduction to Peer-To-Peer Networks
Introduction to Peer-to-Peer Networks The Story of Peer-to-Peer The Nature of Peer-to-Peer: Generals & Paradigms Unstructured Peer-to-Peer Systems Sample Applications 1 Prof. Dr. Thomas Schmidt http:/www.informatik.haw-hamburg.de/~schmidt A Peer-to-Peer system is a self-organizing system of equal, autonomous entities (peers) which aims for the shared usage of distributed resources in a networked environment avoiding central services. Andy Oram 2 Prof. Dr. Thomas Schmidt http:/www.informatik.haw-hamburg.de/~schmidt The Old Days NetNews (nntp) Usenet since 1979, initially based on UUCP Exchange (replication) of news articles by subscription Group creation/deletion decentralised DNS Distributed delegation of name authorities: file sharing of host tables Name “Servers” act as peers Hierarchical information space permits exponential growth Systems are manually configured distributed peers 3 Prof. Dr. Thomas Schmidt http:/www.informatik.haw-hamburg.de/~schmidt SETI@home: Distributed Computing Search for Extraterrestrial Intelligence (SETI) Analyse radio sig- nals from space Globally shared computing res. Idea 1995 First version 1998 2002 ≈ 4 Mio clnt E.g. Screensaver From Anderson et. al.: SETI@home, Comm. ACM, 45 (11), Nov. 2002 http://setiathome.berkeley.edu/ - ongoing 4 Prof. Dr. Thomas Schmidt http:/www.informatik.haw-hamburg.de/~schmidt SETI@home (2) http-based client-server model No client-client communication Data chunks: load & return N-redundancy for fault detection Attacks: bogus code From Anderson -
Peer-To-Peer Networks
Peer-to-Peer Networks 14-740: Fundamentals of Computer Networks Credit to Bill Nace, 14-740, Fall 2017 Material from Computer Networking: A Top Down Approach, 6th edition. J.F. Kurose and K.W. Ross traceroute • P2P Overview • Architecture components • Napster (Centralized) • Gnutella (Distributed) • Skype and KaZaA (Hybrid, Hierarchical) • KaZaA Reverse Engineering Study 14-740: Spring 2018 2 What is P2P? • Client / Server interaction • Client: any end-host • Server: specific end-host • P2P: Peer-to-peer • Any end-host • Aim to leverage resources available on “clients” (peers) • Hard drive space • Bandwidth (especially upload) • Computational power • Anonymity (i.e. Zombie botnets) • “Edge-ness” (i.e. being distributed at network edges) • Clients are particularly fickle • Users have not agreed to provide any particular level of service • Users are not altruistic -- algorithm must force participation without allowing cheating • Clients are not trusted • Client code may be modified • And yet, availability of resources must be assured P2P History • Proto-P2P systems exist • DNS, Netnews/Usenet • Xerox Grapevine (~1982): name, mail delivery service • Kicked into high gear in 1999 • Many users had “always-on” broadband net connections • 1st Generation: Napster (music exchange) • 2nd Generation: Freenet, Gnutella, Kazaa, BitTorrent • More scalable, designed for anonymity, fault-tolerant • 3rd Generation: Middleware -- Pastry, Chord • Provide for overlay routing to place/find resources 14-740: Spring 2018 6 P2P Architecture • Content Directory -
VMS CRA Y Station Now Available It Is Now Possible to Submit Jobs Functions Closely
VMS CRA Y Station Now Available It is now possible to submit jobs Functions closely. It is implemented as a to the CRAY-1 from UCC's VAX/VMS The VMS station provides these series of commands entered in system. functions: response to the system's $ A CRAY-1 running the cos oper prompt. The commands look like ating system requires another -It submits jobs to the CRAY-1, VMS commands: they have pa computer to act as a "front-end" and returns output as a file un rameters and /qualifiers; they fol system. You prepare jobs and der the user's VMS directory. low much the same syntax and data on the front-end system, us -It transfers files between the interpretation rules (for example, ing whatever tools that system machines using the cos AC wild cards are handled correctly); provides, then submit the files as QUIRE and DISPOSE commands. and they prompt for required a batch job to the CRAY for proc The source of an ACQUIREd file parameters not present on the essing. Output is returned to the can be disk or tape; the desti command line. You can always front-end system for viewing. nation of a DISPOSEd file can recognize a station command, The software that runs on the be disk, tape, printer, or the though, because it always begins front-end machine to provide this VMS batch input queue. with the letter C. For example, communication is called a -At your option, it sends bulle the station command to submit a "station." tins to the terminal chronicling job to the CRAY is CSUBMIT. -
The Beginner's Handbook of Amateur Radio
FM_Laster 9/25/01 12:46 PM Page i THE BEGINNER’S HANDBOOK OF AMATEUR RADIO This page intentionally left blank. FM_Laster 9/25/01 12:46 PM Page iii THE BEGINNER’S HANDBOOK OF AMATEUR RADIO Clay Laster, W5ZPV FOURTH EDITION McGraw-Hill New York San Francisco Washington, D.C. Auckland Bogotá Caracas Lisbon London Madrid Mexico City Milan Montreal New Delhi San Juan Singapore Sydney Tokyo Toronto McGraw-Hill abc Copyright © 2001 by The McGraw-Hill Companies. All rights reserved. Manufactured in the United States of America. Except as per- mitted under the United States Copyright Act of 1976, no part of this publication may be reproduced or distributed in any form or by any means, or stored in a database or retrieval system, without the prior written permission of the publisher. 0-07-139550-4 The material in this eBook also appears in the print version of this title: 0-07-136187-1. All trademarks are trademarks of their respective owners. Rather than put a trademark symbol after every occurrence of a trade- marked name, we use names in an editorial fashion only, and to the benefit of the trademark owner, with no intention of infringe- ment of the trademark. Where such designations appear in this book, they have been printed with initial caps. McGraw-Hill eBooks are available at special quantity discounts to use as premiums and sales promotions, or for use in corporate training programs. For more information, please contact George Hoare, Special Sales, at [email protected] or (212) 904-4069. TERMS OF USE This is a copyrighted work and The McGraw-Hill Companies, Inc. -
Comrol of Speech Playback
AUGUST 22. 1974 ICATION 87 Soundsheet: Variable Speech Control 96 Scheduling and loading IC test systems 104 Designing data acquisition into minis Electronics® co mrol of Speech Playback efin eV ..qc -4 IL.) —J 0.500" MIN. Dialight t 4,-10.210" 0.120 - elP. 0.190" 521-9207 sees aneed • (Need: The widest choice for your every application.) 521-9206 521-9189 Your choice of green, yellow and red, with axial leads for dense packaging requirements. Wide viewing angle for 521-9202 easy readability. Low power consumption, low cost, IC compatible. 10mA operation for typical brightness. Size is identical to the most popular red LEDs. 521-9165 .192" .11 .7 •500 " .0454 (mIN.) .240" Now available in green, yellow and red. Mini-sized for maximum front panel density and easy panel mounting. High luminous intensity, low cost. Vibration/shock resist- ant. Solid state for long life. Wide viewing angles. Ideal for applications like panel lighting, film annotation and alpha-numeric displays. 550-0204 550-0405 550-0306 rt .185" .245" LED logic state fault indicators available in 14 models with voltage ratings from 1.7 to 14. Suitable for dense 11 packaging on printed circuit boards—up to 10 units to the inch—IC compatible. With built-in series resistor. MIN. 9 .340" Polarity identified. Low power consumption. Dialight, the company with the widest choice in 1.-.100- -0-11 -•- .020" switches, LEDs, indicator lights and readouts, Mix 'em or match 'em. LED logic state fault indicators looks for needs .. your needs .. and then they are available in red, yellow and green, in a variety of develop solutions for your every application. -
The Great Telecom Meltdown for a Listing of Recent Titles in the Artech House Telecommunications Library, Turn to the Back of This Book
The Great Telecom Meltdown For a listing of recent titles in the Artech House Telecommunications Library, turn to the back of this book. The Great Telecom Meltdown Fred R. Goldstein a r techhouse. com Library of Congress Cataloging-in-Publication Data A catalog record for this book is available from the U.S. Library of Congress. British Library Cataloguing in Publication Data Goldstein, Fred R. The great telecom meltdown.—(Artech House telecommunications Library) 1. Telecommunication—History 2. Telecommunciation—Technological innovations— History 3. Telecommunication—Finance—History I. Title 384’.09 ISBN 1-58053-939-4 Cover design by Leslie Genser © 2005 ARTECH HOUSE, INC. 685 Canton Street Norwood, MA 02062 All rights reserved. Printed and bound in the United States of America. No part of this book may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying, recording, or by any information storage and retrieval system, without permission in writing from the publisher. All terms mentioned in this book that are known to be trademarks or service marks have been appropriately capitalized. Artech House cannot attest to the accuracy of this information. Use of a term in this book should not be regarded as affecting the validity of any trademark or service mark. International Standard Book Number: 1-58053-939-4 10987654321 Contents ix Hybrid Fiber-Coax (HFC) Gave Cable Providers an Advantage on “Triple Play” 122 RBOCs Took the Threat Seriously 123 Hybrid Fiber-Coax Is Developed 123 Cable Modems -
News on Educational Use of Computers Among Michigan Colleges and Universities
DOCUMENT RESUME ED 097 862 IR 001 204 AUTHOR Zinn, Karl, Ed. TITLE News on Educational Use of Computers Among Michigan Colleges and Universities. INSTITUTION Michigan Univ., Ann Arbor. Center for Research on Learning and Teaching. PUB DATE Jul 74 NOTE 74p.; Special Summer Issue on /CM 74 JOURNAL CIT On-Line; v3n4 Jul 1974 EDRS PRICE MF-$0.75 MC-$3.15 PLUS POSTAGE DESCRIPTORS * Computer Assisted Instruction; Computer Oriented Programs; *Computer Programs; *Computers; Conference Reports; *Mathematics; *Sciences IDENTIFIERS MERIT Computer Network; *Michigan ABSTRACT A special issue of the journal "On Linen is devoted to reporting the 1974 Instructional Computing inMichigan conference. The conference was divided into numerous sessions, and there are individual reports summarizing the activities and papers of each session. The sessions reported are on the instructionalcomputing aspects of mathematics, physical and environmentalsciences, behavioral and social sciences, arts and music, community colleges, college teaching and learning activities, terminals andcommunication facilities, and the MERIT Computer Network. In addition, a feyof the papers presented at the mathematicsand sciences sessions are reprinted in this issue. (VH) Volume Nurnbcr 4 JuZy la74 NEWS ON EDUCATIONAL USE OF COMPUTERS AMONG MICHIGAN COLLEGES AND UNIVERSITIES 101611111E Special Summer Issue on 1CM 74 SPECIAL REPORTS Page ICM 74 Table of Contents Int oduction to the 1CM 74 Conference Record K. Zinn 1 Mathematics Reports by H. Dershem, R. DeVinney, L. Allen and A. Falk 3 Physical and Environmental Sciences Reports by J. Moore, D. Emerson, J. Herman, J. Clime, R. Rosenberg, J. Forsythe and N. Eick 14 Behavioral and Social Sciences Reports by D. -
Federal Communications Commission § 80.110
SUBCHAPTER D—SAFETY AND SPECIAL RADIO SERVICES PART 80—STATIONS IN THE 80.71 Operating controls for stations on land. MARITIME SERVICES 80.72 Antenna requirements for coast sta- tions. Subpart A—General Information 80.74 Public coast station facilities for a te- lephony busy signal. GENERAL 80.76 Requirements for land station control Sec. points. 80.1 Basis and purpose. 80.2 Other regulations that apply. STATION REQUIREMENTS—SHIP STATIONS 80.3 Other applicable rule parts of this chap- 80.79 Inspection of ship station by a foreign ter. Government. 80.5 Definitions. 80.80 Operating controls for ship stations. 80.7 Incorporation by reference. 80.81 Antenna requirements for ship sta- tions. Subpart B—Applications and Licenses 80.83 Protection from potentially hazardous RF radiation. 80.11 Scope. 80.13 Station license required. OPERATING PROCEDURES—GENERAL 80.15 Eligibility for station license. 80.17 Administrative classes of stations. 80.86 International regulations applicable. 80.21 Supplemental information required. 80.87 Cooperative use of frequency assign- 80.25 License term. ments. 80.31 Cancellation of license. 80.88 Secrecy of communication. 80.37 One authorization for a plurality of 80.89 Unauthorized transmissions. stations. 80.90 Suspension of transmission. 80.39 Authorized station location. 80.91 Order of priority of communications. 80.41 Control points and dispatch points. 80.92 Prevention of interference. 80.43 Equipment acceptable for licensing. 80.93 Hours of service. 80.45 Frequencies. 80.94 Control by coast or Government sta- 80.47 Operation during emergency. tion. 80.49 Construction and regional service re- 80.95 Message charges. -
Article a Look at S&T Awareness
SISSA – International School for Advanced Studies Journal of Science Communication ISSN 1824 – 2049 http://jcom.sissa.it/ Article A look at S&T Awareness - Enhancements in India Chandra Mohan Nautiyal Basing mainly on author's direct involvement in some science communication efforts in India, and other reports, this contribution depicts and analyses the present science communication/ popularization scenario in India. It tries to dispel a myth that rural people don't require or don’t crave for S&T information. It discusses need for science and technology communication, sustaining curiosity and creating role models. Citing cases of some natural, 'unnatural' and organized events, it recounts how S&T popularization efforts have fared during the past decade and a half. It's made possible using print, AV and interactive media which, at times, require lot of financial inputs. However, this contribution shows that a number of natural and other phenomena can be used to convince people about power of S&T and in molding their attitude. The cases cited may be from India, but, with a little variation, are true for most of the developing and under- developed societies. 1. Introduction Considering that nearly half of the Indian population is engaged in agriculture but contributes only about one fifth to the GDP, indicates a malaise and calls for more scientific and methodical approach in the farming sector. A change is needed not only in the information base but also the attitude. Therefore, there is a need to examine the role of Science and Technology (S&T) in their lives and ways to improve the level.