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History of Computers

Done By: Tay Zheng Huan

Tay Zheng Huan

on 24 April 2010

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Transcript of History of Computers

History of computers Done By: Tay Zheng Huan What Is A Computer? The first computers were people! Electronic computers and the earlier mechanical computers were given this name because they performed the work that had previously been assigned to people.

"Computer" was originally a job title: it was used to describe those human beings (predominantly women) whose job it was to perform the repetitive calculations required to compute such things as navigational tables, tide charts, and planetary positions for astronomical almanacs. Problems With Human Computers Boredom would quickly set in after computing repetitive calculations, leading to carelessness, leading to mistakes. And even on your best days you wouldn't be producing answers very fast. The abacus was an early aid for mathematical computations. Its only value is that it aids the memory of the human performing the calculation. Harvard Mark I computer However it was not a purely electronic computer. Instead the Mark I was constructed out of switches, relays, rotating shafts, and clutches.

The machine weighed 5 tons, incorporated 500 miles of wire, was 8 feet tall and 51 feet long, and had a 50 ft rotating shaft running its length, turned by a 5 horsepower electric motor This was the first programmable digital computer made in the U.S. One of the primary programmers for the Mark I was a woman, Grace Hopper. Hopper found the first computer "bug": a dead moth that had gotten into the Mark I and whose wings were blocking the reading of the holes in the paper tape. The word "bug" had been used to describe a defect since at least 1889 but Hopper is credited with coining the word "debugging" to describe the work to eliminate program faults. One of the bested home computer of 1976 such as this Apple I which sold for only $600 The IBM 7094, a typical mainframe computer Few decades later... Modern Computers Finally emerges as what we uses daily :D Thank You!
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