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Charles Babbage, FRS was an English polymath. A mathematician, philosopher, inventor and mechanical engineer, Babbage is best remembered for originating the concept of a programmable computer
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In 1968, Hewlett Packard began marketing the first mass-marketed PC and the first desktop computer, the HP 9100A
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In 1975, Ed Roberts coined the term "personal computer" when he introduced the Altair 8800. Although the first personal computer is considered by many to be the KENBAK-1, which was first introduced for $750 in 1971. The computer relied on a series of switches for inputting data and output data by turning on and off a series of lights.
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The IBM 5100 is recognized as the first portable computer and was first released in September 1975. The computer weighed 55 pounds and had a five inch CRT display, tape drive, 1.9MHz PALM processor, and 64KB of RAM. The picture is an ad of the IBM 5100 taken from a November 1975 issue of scientific america
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IBM introduced its first personal computer called the IBM PC in 1981.The computer was code named and still sometimes referred to as the Acorn and had a 8088 processor, 16 KB of memory, which was expandable to 256 and utilized MS-DOS.
