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A Symbolic Analysis of Relay and Switching Circuits
Electrical engineer and mathematician Claude Shannon, in his master’s thesis, "A Symbolic Analysis of Relay and Switching Circuits," uses Boolean algebra to establish a working model for digital circuits. This paper, as well as later research by Shannon, lays the groundwork for the future telecommunications and computer industries. -
Atanasoff-Berry Computer, the first electronic computer
John Atanasoff and Clifford Berry at Iowa State College design the first electronic computer. The obscure project, called the Atanasoff-Berry Computer (ABC), incorporates binary arithmetic and electronic switching. Before the computer is perfected, Atanasoff is recruited by the Naval Ordnance Laboratory and never resumes its research and development. -
First binary digital computers are developed
The first binary digital computers are developed. Bell Labs’s George Stibitz designs the Complex Number Calculator, which performs mathematical operations in binary form using on-off relays, and finds the quotient of two 8-digit numbers in 30 seconds. In Germany, Konrad Zuse develops the first programmable calculator, the Z2, using binary numbers and Boolean algebra—programmed with punched tape. -
First vacuum-tube programmable logic calculator
Colossus, the world’s first vacuum-tube programmable logic calculator, is built in Britain for the purpose of breaking Nazi codes. On average, Colossus deciphers a coded message in two hours. -
Specifications of a stored-program computer
Two mathematicians, Briton Alan Turing and Hungarian John von Neumann, work independently on the specifications of a stored-program computer. Von Neumann writes a document describing a computer on which data and programs can be stored. Turing publishes a paper on an Automatic Computing Engine, based on the principles of speed and memory. -
First electronic computer put into operation
The first electronic computer put into operation is developed late in World War II by John Mauchly and John Presper Eckert at the University of Pennsylvania’s Moore School of Electrical Engineering. The Electronic Numerical Integrator and Computer (ENIAC), used for ballistics computations, weighs 30 tons and includes 18,000 vacuum tubes, 6,000 switches, and 1,500 relays. -
Transistor is invented
John Bardeen, Walter H. Brattain, and William B. Shockley of Bell Telephone Laboratories invent the transistor. -
First stored-program compute is built
The Electronic Delay Storage Automatic Calculator (EDSAC), the first stored-program computer, is built and programmed by British mathematical engineer Maurice Wilkes. -
First computer designed for U.S. business
Eckert and Mauchly, now with their own company (later sold to Remington Rand), design UNIVAC (UNIVersal Automatic Computer)—the first computer for U.S. business. -
First computer compiler
Grace Murray Hopper, a senior mathematician at Eckert-Mauchly Computer Corporation and a programmer for Harvard’s Mark I computer, develops the first computer compiler, a program that translates computer instructions from English into machine language. -
First disk drive for random-access storage of data
IBM engineers led by Reynold Johnson design the first disk drive for random-access storage of data, offering more surface area for magnetization and storage than earlier drums. In later drives a protective "boundary layer" of air between the heads and the disk surface would be provided by the spinning disk itself. -
FORTRAN becomes commercially available
FORTRAN (for FORmula TRANslation), a high-level programming language developed by an IBM team led by John Backus, becomes commercially available. FORTRAN is a way to express scientific and mathematical computations with a programming language similar to mathematical formulas. Backus and his team claim that the FORTRAN compiler produces machine code as efficient as any produced directly by a human programmer. -
Integrated circuit invented
Jack Kilby of Texas Instruments and Robert Noyce of Fairchild Semiconductor independently invent the integrated circuit. -
Digital Equipment Corporation introduces the "compact" PDP-1
Digital Equipment Corporation introduces the "compact" PDP-1 for the science and engineering market. Not including software or peripherals, the system costs $125,000, fits in a corner of a room, and doesn’t require air conditioning. -
BASIC
Dartmouth professors John Kemeny and Thomas Kurtz develop the BASIC (Beginners All-Purpose Symbolic Instruction Code) programming language specifically for the school's new timesharing computer system. Designed for non-computer-science students, it is easier to use than FORTRAN. Other schools and universities adopt it, and computer manufacturers begin to provide BASIC translators with their systems. -
Computer mouse makes its public debut
The computer mouse makes its public debut during a demonstration at a computer conference in San Francisco. Its inventor, Douglas Engelbart of the Stanford Research Institute, also demonstrates other user-friendly technologies such as hypermedia with object linking and addressing. Engelbart receives a patent for the mouse 2 years later. -
Palo Alto Research Center (PARC)
Xerox Corporation assembles a team of researchers in information and physical sciences in Palo Alto, California, with the goal of creating "the architecture of information." -
First home computer is marketed to hobbyists
The Altair 8800, widely considered the first home computer, is marketed to hobbyists by Micro Instrumentation Telemetry Systems. The build-it-yourself kit doesn’t have a keyboard, monitor, or its own programming language; data are input with a series of switches and lights. -
Apple II is released
Apple Computer, founded by electronics hobbyists Steve Jobs and Steve Wozniak, releases the Apple II, a desktop personal computer for the mass market that features a keyboard, video monitor, mouse, and random-access memory (RAM) that can be expanded by the user. Independent software manufacturers begin to create applications for it. -
First laptop computer is designed
What is thought to be the first laptop computer is designed by William Moggridge of GRiD Systems Corporation in England. The GRiD Compass 1109 has 340 kilobytes of bubble memory and a folding electroluminescent display screen in a magnesium case. Used by NASA in the early 1980s for its shuttle program, the "portable computer" is patented by GriD in 1982. -
First commercially successful business application
Harvard MBA student Daniel Bricklin and programmer Bob Frankston launch the VisiCalc spreadsheet for the Apple II, a program that helps drive sales of the personal computer and becomes its first commercially successful business application. VisiCalc owns the spreadsheet market for nearly a decade before being eclipsed by Lotus 1-2-3, a spreadsheet program designed by a former VisiCalc employee. -
IBM Personal Computer released
IBM introduces the IBM Personal Computer with an Intel 8088 microprocessor and an operating system—MS-DOS—designed by Microsoft. Fully equipped with 64 kilobytes of memory and a floppy disk drive, it costs under $3,000. -
Macintosh is introduced
Apple introduces the Macintosh, a low-cost, plug-and-play personal computer whose central processor fits on a single circuit board. Although it doesn’t offer enough power for business applications, its easy-to-use graphic interface finds fans in education and publishing. -
CD-ROM introduced
Philips and Sony combine efforts to introduce the CD-ROM (compact disc read-only memory), patented in 1970 by James T. Russell. -
Windows 1.0 is released
Microsoft releases Windows 1.0, operating system software that features a Macintosh-like graphical user interface (GUI) with drop-down menus, windows, and mouse support. Because the program runs slowly on available PCs, most users stick to MS-DOS. Higher-powered microprocessors beginning in the late 1980s make the next attempts—Windows 3.0 and Windows 95—more successful. -
World Wide Web
The World Wide Web becomes available to the general public (see Internet). -
Personal digital assistant
Apple chairman John Sculley coins the term "personal digital assistant" to refer to handheld computers. One of the first on the market is Apple’s Newton, which has a liquid crystal display operated with a stylus. The more successful Palm Pilot is released by 3Com in 1996. -
Palm VII connected organizer
Responding to a more mobile workforce, handheld computer technology leaps forward with the Palm VII connected organizer, the combination of a computer with 2 megabytes of RAM and a port for a wireless phone. At less than $600, the computer weighs 6.7 ounces and operates for up to 3 weeks on two AAA batteries. Later versions offer 8 megabytes of RAM, Internet connectivity, and color screens for less than $500.
