An introduction to information processing by Harvey M Deitel; Barbara Deitel

By Harvey M Deitel; Barbara Deitel

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Debugging had to be discovered. I can remember the exact instant when I realized that a large part of my life from then on was going to be spent in finding mistakes in my own programs. UNIVAC: The First Commercial Computer I n 1 946 Eckert and Mauchly left the University of Pennsylvania to form the Eckert-Mauchly Com- The Evolution of Compute rs The EN IAC The E NIAC occupied 1 500 square feet of floor space and weighed 30 tons. It consumed so much electricity that it actually dimmed the lights of the city of Philadelphia (it was kept at the University of Pennsylvania there) when it was turned on.

The models were upwards compatible, that is, programs that would run on a small model would also run on the larger mod­ els. A growth-oriented organization could begin with a small 360 to meet its current and near­ term needs and then install a larger model as its needs grew. The concept was brilliant, and the 360 series became the best-selling computers of the 1 960s. During the third generation Control Data Cor­ poration strengthened its position in the super­ computer field with the delivery of the CDC 6600 i n 1 964.

Figure 2 - 1 7 Figure 2 - 1 8 Magnetic core memory. Each donut-shaped magnetic core has three wires running through it. By adjusting the currents running through the wires, a computer can read the value in a core ("O" or " I ") , set a core to a specific value, or flip a core's value to the opposite value ("0" becomes " 1 " and " l " becomes "0"). Figure 2 - 19 The first transistor. The Evolution of Computers of the world's leading manufacturers of super­ computers, the enormously powerful machines used to perform the most complex mathematical and scientific calculations.

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