A Brief History of the Computer  
   
ENIAC, 1946
Regarded  as the first general purpose electronic computer, the Electronic  Numerical Integrator and Computer (ENIAC) was initially commissioned for  the use in World War II,  but not completed until one year after the war had ended . Installed at  the University of Pennsylvania, its 40 separate eight-foot-high racks  and 18,000 tubes were intended to help calculate ballistic trajectories.  
 
  
   
SAGE, 1954
A  gigantic computerized air defense system, SAGE (Semi-Automatic Ground  Environment) was designed to help the Air Force track radar data in real  time. Equipped with technical advances such as modems and graphical  displays, the machine weighed 300 tons and occupied one floor of a  concrete blockhouse.  
 
  
 
 NEAC 2203, 1960
Manufactured by the Nippon Electric Company  (NEC), the drum-based machine was one of the earliest transistorized  Japanese computers. It was used for business, scientific and engineering  applications. 
  
   
   
IBM System/360, 1964
Part  of a family of interchangeable computers, the IBM System/360 mainframe  was the first to cover a complete range of applications, from small to  large, from commercial to scientific. Users were able to enlarge or  shrink their setup without having to make headache-inducing software  upgrades as well. Higher-end System/360 models had roles in NASA's Apollo missions as well as air traffic control systems.  
  
 CDC 6600, 1964
For a time the fastest machine in the world, Control Data Corporation' s 6600 machine was designed by noted computer architect Seymour Cray. It retained its speed crown until 1969, when Cray designed his next supercomputer.  
  
  
 DEC PDP-8, 1965
The first successful commercial minicomputer, the PDP-8, made by the Digital Equipment Corporation, sold more than 50,000 units upon its release, the most of any computer up to that time. Years before Apple  and Gnu/Linux offered alternatives to the dominant IBM/Microsoft  paradigms, DEC proposed its own vision, by encouraging users to educate  themselves and take part in the evolution of the line.  
  
 Interface Message Processor, 1969
Conceived at the height of the Cold War,  when the U.S. government sought a way to keep its network of computers  alive in case certain nodes were destroyed in a nuclear attack or other  hostile act, the IMP featured the first generation of gateways, which  are today known as routers. As such, IMP performed a critical task in  the development of the ARPANET (Advanced Research Projects Agency  Network), the world's first operational packet switching network, and the predecessor of the contemporary global Internet. 
 
  
 
  
 Kenbak-1, 1971
Often  considered the world's first "personal computer" the Kenbak was touted  as an easy-to-use educational tool, but it failed to sell more than  several dozen units. Lacking a microprocessor, it had only 256 bytes of  computing power and its only output was a series of blinking lights.  
  
 Cray-1, 1976
At  the time of its release, the Cray-1, above, was the fastest computing  machine at the world. Despite its price tag  between $5 and $10 million   it sold well. It is one of the many machines designed by Seymour Cray, a  computer architect who devoted his life to the creation of so-called  supercomputers, machines which prioritized processing capacity and speed  of calculation.  
  
 Apple I, 1976
Initially conceived by Steve Wozniak (a.k.a. "Woz") as a build-it-yourself kit computer, Apple I was initially rejected by his bosses at Hewlett-Packard. Undeterred, he offered it to Silicon Valley's Homebrew Computer Club and, together with his friend Steve Jobs,  managed to sell 50 pre-built models to The Byte Shop in Mountain View,  California. The suggested retail price: $666. Though sales were low, the  machine paved the way for the smash success of the Apple II.
   
 IBM Personal Computer, 1981
Featuring an independent keyboard, printer and monitor, the slick, complete-looking package that was the IBM PC helped push personal computing out of the hobbyist's garage and into the corporate and consumer mainstream. Its immense commercial success made it the hallmark of personal computing for many years and led other manufacturers to produce similar desktop models.  
  
 Osborne 1 Portable Computer, 1981
The  first commercial portable computer, the Osborne weighed 24 lbs. and  cost less than $2,000. It gained popularity because of its low price and  the extensive software library that came with it
   
 Hewlett-Packard 150, 1983
Representing  the first step in a technology widely available today, the HP 150 was  the first commercially available computer with touch screen technology.  The 9-inch computer screen was surrounded by infrared transmitters and  receivers that detected the position of the user's finger.  
 
  
 
  
 Deep Blue, 1997
Begun at IBM in the late 80's, the Deep Blue project was an attempt at using parallel processing to solve a difficult problem  namely, beating the best chess player in the world, Garry Kasparov. During a six-game match, which Kasparov ultimately lost, the confounded master attributed one move to "the hand of God."  
  
  
 iPhone, 2007
The handy little device introduced by Apple CEO Steve Jobs  in 2007 not only brings together internet access, a regular cell phone,  camera and media player, it supports a wide variety of third party  applications, or apps, that supply everything from recipes to maps of  the night sky, and wraps it all in a sleek, glossy exterior.  
  
 iPad, 2010
And  now the tablet is finally here. It's called an iPad, and it's half an  inch thick, weighs 1.5 pounds and features a 9.7 inch display. As Steve  Jobs says in the presentation above, the device has a 10-hour battery  life, so you'll be able to use all the 3rd-party apps, games, video and  online newspapers you want. The Wi-Fi iPad begins at $499 while the 3G  version begins at $629.