American History
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Title: American History

Essay Details:

Subject: American History
Author: Josefina Z
Date: January 15, 2011
Level: University
Grade: A
Length: 1 / 260

Essay text:

However, the end users were able to perform spreadsheet analysis and word processing for fewer than five thousand dollars as opposed to the multi-user mini and mainframe computers that were far more expensive and these tasks were very time-consuming to perform. 2. Threat of substitutes. Mainframes, minicomputers, and Apple PCs were "closed" and proprietary systems and could not be copied or cloned because of patents and copyrights. However, IBM entered the computer market in 1981, and changed the computer industry by offering an "open" system. The specifications of the IBM PC were easily obtainable which allowed independent software vendors to write programs that would run on different brands of PCs...

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