ENIAC 2004 Deitel Associates Inc All rights reserved UNIVAC 2004 Deitel

Eniac 2004 deitel associates inc all rights reserved

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ENIAC
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2004 Deitel & Associates, Inc. All rights reserved. UNIVAC
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2004 Deitel & Associates, Inc. All rights reserved. ENIAC
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2004 Deitel & Associates, Inc. All rights reserved. 1.4 The 1960s • 1960s Still batch-processing systems Process multiple jobs at once • Multiprogramming One job could use processor while other jobs used peripheral devices Advanced operating systems developed to service multiple interactive users • 1964 IBM announced System/360 family of computers
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2004 Deitel & Associates, Inc. All rights reserved. IBM 360
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2004 Deitel & Associates, Inc. All rights reserved. Cards
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2004 Deitel & Associates, Inc. All rights reserved. Tape
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2004 Deitel & Associates, Inc. All rights reserved. 1.4 The 1960s Timesharing systems Developed to support many simultaneous interactive users Turnaround time was reduced to minutes or seconds Time between submission of job and the return of its results Real-time systems Supply response within certain bounded time period Improved development time and methods MIT used CTSS system to develop its own successor, Multics TSS, Multics and CP/CMS all incorporated virtual memory Address more memory locations than actually exist
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2004 Deitel & Associates, Inc. All rights reserved. 1.5 The 1970s Primarily multimode timesharing systems Supported batch processing, timesharing and real-time applications Personal computing only in incipient stages Fostered by early developments in microprocessor technology Department of Defense develops TCP/IP Standard communications protocol Widely used in military and university settings Security problems Growing volumes of information passed over vulnerable communications lines.
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2004 Deitel & Associates, Inc. All rights reserved. IBM PC
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2004 Deitel & Associates, Inc. All rights reserved. 1.6 The 1980s • 1980s Decade of personal computers and workstations Computing distributed to sites at which it was needed Personal computers proved relatively easy to learn and use Graphical user interfaces (GUI) Transferring information between computers via networks became more economical and practical
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2004 Deitel & Associates, Inc. All rights reserved. 1.6 The 1980s Client/server computing model became widespread Clients request various services Servers perform requested services Software engineering field continued to evolve Major thrust by the United States government aimed at tighter control of Department of Defense software projects Realizing code reusability Greater degree of abstraction in programming languages Multiple threads of instructions that could execute independently
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2004 Deitel & Associates, Inc. All rights reserved. 1.7 History of the Internet and World Wide Web Advanced Research Projects Agency (ARPA) Department of Defense In late 1960s, created and implemented ARPAnet Grandparent of today’s Internet Networked main computer systems of ARPA-funded institutions Capable of near-instant communication via e-mail Designed to operate without centralized control
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2004 Deitel & Associates, Inc. All rights reserved.
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