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The history of computers . Dr. John V. Atanasoff and Clifford Berry design and build the first electronic digital computer. Their machine, the Atanasoff-Berry-Computer, or ABC, provides the foundation for advances in electronic digital computers. 1937.

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Dr. John V. Atanasoff and Clifford Berry design and build the first electronic digital computer. Their machine, the Atanasoff-Berry-Computer, or ABC, provides the foundation for advances in electronic digital computers.

1937
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William Shockley, John Bardeen, and Walter Brattain invent the transfer resistance device, eventually called the transistor. The transistor would revolutionize computers, proving much more reliable than vacuum tubes.

1947
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The IBM 305 RAMAC system is the first to use magnetic disk for external storage. The system provides storage capacity similar to magnetic tape that previously was used, but offers the advantage of semi-random access capability.

1957
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Alan Shugart at IBM demonstrates the first regular use of an 8-inch floppy (magnetic storage) disk.

1968
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Steve Wozniak and Steve Jobs build the first Apple computer. A subsequent version, the Apple II, is an immediate success. Adopted by elementary schools, high schools, and colleges, for many students the Apple II is their first contact with the world of computers.

1976
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The IBM PC is introduced, signaling IBM\'s entrance into the personal computer marketplace. The IBM PC quickly garners the largest share of the personal computer market and becomes the personal computer of choice in business.

1981
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World Wide Web Consortium releases standards that describe a frame work for linking documents on different computers.

1991
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Microsoft releases Windows 95, a major upgrade to its Windows operating system. Windows 95 consists of more than 10,000,000 lines of computer instructions developed by 300 person-years of effort. More than 50,000 individuals and companies test the software before it is released.

1995
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Handspring begins shipping the Treo™ communicator, a handheld computer with cellular telephone, e-mail, text messaging, and wireless Web capabilities.

2002
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