International Business Machines Corporation (abbreviated IBM and also nicknamed "Big Blue") is a multinational computer technology and consulting corporation headquartered in Armonk, NY, USA. The company is one of the few information technology companies with a continuous history dating back to the 19th century. IBM manufactures and sells computer hardware and software, and offers infrastructure services, hosting services, and consulting services in areas ranging from mainframe computers to Nan technology.

IBM has been known through most of its recent history as the world's largest computer company; with over 355,000 employees worldwide, IBM is the largest information technology employer in the world. It is also the most profitable, but in revenues it fell to second place behind Hewlett Packard in 2007.

IBM holds more patents than any other U.S. based technology company. It has engineers and consultants in over 170 countries and IBM Research has eight laboratories worldwide.

IBM employees have earned three Nobel Prizes, four Turing Awards, five National Medals of Technology, and five National Medals of Science. As a chip maker, IBM is among the Worldwide Top 20 Semiconductor Sales Leaders.





HISTORY OF COMPUTERS - continued (PREV) (PAGE 1)
The art of analog computing reached its zenith with the differential analyzer, invented in 1876 by James Thomson and built by H. W. Nieman and Vannevar Bush at MIT starting in 1927. Fewer than a dozen of these devices were ever built; the most powerful was constructed at the University of Pennsylvania's Moore School of Electrical Engineering, where the ENIAC was built. Digital electronic computers like the ENIAC spelled the end for most analog computing machines, but hybrid analog computers, controlled by digital electronics, remained in substantial use into the 1950s and 1960s, and later in some specialized applications.

Early digital computers
The era of modern computing began with a flurry of development before and during World War II, as electronic circuits, relays, capacitors, and vacuum tubes replaced mechanical equivalents and digital calculations replaced analog calculations. Machines such as the Atanasoff–Berry Computer, the Z3, the Colossus, and ENIAC were built by hand using circuits containing relays or valves (vacuum tubes), and often used punched cards or punched paper tape for input and as the main (non-volatile) storage medium.


Punched Paper Tape

In this era, a number of different machines were produced with steadily advancing capabilities. At the beginning of this period, nothing remotely resembling a modern computer existed, except in the long-lost plans of Charles Babbage and the mathematical musings of Alan Turing and others.

At the end of the era, devices like the EDSAC had been built, and are universally agreed to be digital computers. Defining a single point in the series as the "first computer" misses many subtleties.
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