In 1946
The Manchester Small-Scale Experimental Machine, nicknamed Baby, was the world's first stored-program computer. It was built at the Victoria University of Manchester by Frederic C. Williams, Tom Kilburn and Geoff Tootill, and ran its first program on 21 June 1948. In 1941, Zuse followed his earlier machine up with the Z3, the world's first working electromechanical programmable, fully automatic digital computer. The Z3 was built with 2000 relays, implementing a 22 bit word length that operated at a clock frequency of about 5–10 Hz. Though ENIAC was designed and primarily used to calculate artillery firing tables for the United States Army 's Ballistic Research Laboratory, its first programs included a study of the feasibility of the hydrogen bomb. When ENIAC was announced in 1946, it was heralded in the press as a Giant Brain.. It had a speed on the order of one thousand (10 3) times faster than that of electro-mechanical machines; this computational power, coupled with general-purpose programmability, excited scientists and industrialists alike.  Who invented the first computer is not a question with a simple answer. There have been a lot of major milestones throughout history that warrant mentioning. The adventure starts in the year 1936. 1936- Konrad Zuse invented the Z1 Computer. This was the first computer that was freely programmable. 1942- John Atanasoff and Clifford Berry created the ABC Computer. 1944- John Presper Eckert and John W. Mauchly came up with the idea for the ENIAC 1 computer. It was the first real scenario where vacuum tubes were used.  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 first laptop or portable computer. The IBM 5100 is the first portable computer, which was released on September 1975. The computer weighed 55 pounds and had a five inch CRT display, tape drive, 1.9MHz PALM processor, and 64KB of RAM. 3. Being completed by 1942, the Atanasoff-Berry Computer (ABC) was the first electronic computer. It was designed and built by John Vincent Atanasoff and his assistant, Clifford E. Berry. At the time, Atanasoff was teaching Physics, and Berry was a graduate student in Electrical Engineering. They worked on the computer from 1939 until 1942 when it was abandoned due to WWII. Built at the Victoria University of Manchester, the first version of the Mark 1 computer became operational in April 1949. Mark 1 was used to run a program to search for Mersenne primes for nine hours without error on June 16 and 17 that same year. The first laptop or portable computer. The IBM 5100 is the first portable computer, which was released on September 1975. The computer weighed 55 pounds and had a five inch CRT display, tape drive, 1.9MHz PALM processor, and 64KB of RAM. 1 1946 - ENIAC-World's first electronic, large scale, general-purpose computer, built by Mauchly and Eckert, and activated at the University of Pennsylvania in 1946. 2  ENIAC recreated on a modern computer chip. 3  See an explanation of ENIAC on a Chip by the Moore School of Electrical Engineering, University of Pennsylvania. 1 1976 - CRAY 1 - The world's first electronic digital computer, developed in 1946. 2  A 75MHz, 64-bit machine with a peak speed of 160 megaflops, (one million floating point operations per second) the world's fastest processor at that time. We could argue that the first computer was the abacus or its descendant, the slide rule, invented by William Oughtred in 1622. But the first computer resembling today's modern machines was the Analytical Engine, a device conceived and designed by British mathematician Charles Babbage between 1833 and 1871.  The ENIAC was invented by J. Presper Eckert and John Mauchly at the University of Pennsylvania and began construction in 1943 and was not completed until 1946. It occupied about 1,800 square feet and used about 18,000 vacuum tubes, weighing almost 50 tons. The first laptop or portable computer. The IBM 5100 is the first portable computer, which was released on September 1975. The computer weighed 55 pounds and had a five inch CRT display, tape drive, 1.9MHz PALM processor, and 64KB of RAM.
https://en.wikipedia.org/wiki/Computer https://en.wikipedia.org/wiki/ENIAC http://news.everestonline.edu/post/2009/07/invented-first-computer/ http://www.computerhope.com/issues/ch000984.htm http://www4.ncsu.edu/~belail/The_Introduction_of_Electronic_Computing/Atanasoff-Berry_Computer.html http://www.computerhope.com/issues/ch000984.htm http://mason.gmu.edu/~montecin/computer-hist-web.htm http://science.howstuffworks.com/innovation/inventions/who-invented-the-computer.htm http://www.computerhope.com/issues/ch000984.htm
when was the first computer built