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By Irv Englander

* displays the most recent know-how within the box to supply readers with the main up to date source* offers examples that conceal a large spectrum of and software program platforms, from own desktops to mainframes* locations extra emphasis on networking to deal with elevated value of the communications zone* Consolidates the assurance of buses into one chapter.* Integrates a number of assessment questions on the finish of every bankruptcy to reinforce the reader's figuring out of the cloth

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The Architecture of Computer Hardware, Systems Software, & Networking: An Information Technology Approach

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As a programmer, it will allow you to write better programs. You will be able to use the characteristics of the machine to make your programs operate more effectively. For example, choosing the appropriate data type for a variable can result in significantly faster performance. Soon you will know why this is so, and how to make the appropriate choices. Computers can perform integer calculations incorrectly if the integers exceed a certain size, but they do not necessarily warn the user of the error.

On a few systems the operating system is actually provided as a network service when the system is turned on. In either case, the bootstrap or IPL (Initial Program Load) program in the operating system is stored within the computer using a type of memory known as ROM, or read-only memory. The bootstrap program provides the tools to test the system and to load the remainder of the operating system from the disk or network. Although the physical medium where the software is stored can be touched, the software itself is considered intangible.

Aiken and associates at Harvard University with help and funding from IBM, used thousands of relays; relays are mechanical binary switches controlled by electrical currents, familiar to you perhaps as the clicking devices that control operations in tape cassette players and telephone answering machines. Although binary relays were used for computation, the fundamental design was decimal. Storage consisted of seventy-two 23-digit decimal numbers, stored on counter wheels. An additional counter wheel digit held the sign, using the digit 0 for plus and 9 for minus.

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