Information Technology (IT) is the application of computers and telecommunications equipment to store, retrieve, transmit and manipulate data, often in the context of a business or other enterprise.
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A difference engine is an automatic mechanical calculator designed to tabulate polynomial functions. The name derives from the method of divided differences, a way to interpolate or tabulate functions by using a small set of polynomial coefficients. Both logarithmic and trigonometric functions, functions commonly used by both navigators and scientists, can be approximated by polynomials, so a difference engine can compute many useful sets of numbers.
The historical difficulty in producing error free tables by teams of mathematicians and human "computers" spurred Charles Babbage's desire to build a mechanism to automate the process.
The historical difficulty in producing error free tables by teams of mathematicians and human "computers" spurred Charles Babbage's desire to build a mechanism to automate the process.
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The Macintosh , marketed as Mac, is a line of personal computers (PCs) designed, developed, and marketed by Apple Inc. It is targeted mainly at the home, education, and creative professional markets.
Steve Jobs introduced the Macintosh 128k on January 24, 1984. This was the first mass-market personal computer featuring a graphical user interface and mouse. The 128 was followed by numerous updated models also based on the Motorola 68000 family processors, producing a family of products in the Macintosh lineup.
By the early 1990s the performance advantage of these systems was eroded by Intel-based systems, and starting in 1994 the Macintosh started a move to the PowerPC-based Power Macintosh line. Through the mid-1990s, improvements in performance and the underlying Wintel platform, notably with the introduction of Windows 95, seriously affected the Macintosh market. In 1998, Apple consolidated its multiple consumer-level desktop models into the all-in-one iMac, which proved to be a sales success and saw the brand revitalized.
Steve Jobs introduced the Macintosh 128k on January 24, 1984. This was the first mass-market personal computer featuring a graphical user interface and mouse. The 128 was followed by numerous updated models also based on the Motorola 68000 family processors, producing a family of products in the Macintosh lineup.
By the early 1990s the performance advantage of these systems was eroded by Intel-based systems, and starting in 1994 the Macintosh started a move to the PowerPC-based Power Macintosh line. Through the mid-1990s, improvements in performance and the underlying Wintel platform, notably with the introduction of Windows 95, seriously affected the Macintosh market. In 1998, Apple consolidated its multiple consumer-level desktop models into the all-in-one iMac, which proved to be a sales success and saw the brand revitalized.