Timeline of computing 1950–79

This article presents a detailed timeline of events in the history of computing from 1950 to 1979. For narratives explaining the overall developments, see the History of computing.

1950s

Date	Place	Event
Sep 1950	GER	Konrad Zuse leased his Z4 machine to the ETH Zurich for five years. Z4 was a relay-based machine. The corresponding contract was signed in the fall of 1949, and the machine reassembled in Zurich after its arrival in July 1950. The Z4 was replaced by ERMETH, a computer developed at the ETH in Switzerland from 1953 to 1956, one of the first electronic computers on the European continent.
1950	UK	Turing Test – The British mathematician and computer pioneer Alan Turing published a paper describing the potential development of human and computer intelligence and communication. The paper would come later to be called the Turing Test.
1950	UK	The Pilot ACE computer, with 800 vacuum tubes, and mercury delay lines for its main memory, became operational on 10 May 1950 at the National Physical Laboratory near London. It was a preliminary version of the full ACE, which had been designed by Alan Turing.
1950	USA	TIME magazine cover story on the Harvard "Mark III: Can man build a superman?" includes a quote from Howard Aiken, commenting on "calculators" (computers) then under construction: "We'll have to think up bigger problems if we want to keep them busy."
30 Mar 1951	USA	The first commercially successful electronic computer, UNIVAC, was also the first general purpose computer – designed to handle both numeric and textual information. Designed by J. Presper Eckert and John Mauchly, whose corporation subsequently passed to Remington Rand. The implementation of this machine marked the real beginning of the computer era. Remington Rand delivered the first UNIVAC machine to the U.S. Bureau of Census. This machine used magnetic tape for input.
21 Apr 1951	USA	Whirlwind, the first real-time computer was built at MIT by the team of Jay Forrester for the US Air Defense System, became operational. This computer is the first to allow interactive computing, allowing users to interact with it using a keyboard and a cathode-ray tube. The Whirlwind design was later developed into SAGE, a comprehensive system of real-time computers used for early warning of air attacks.
17 Nov 1951	UK	J Lyons, a United Kingdom food company, famous for its tea, made history by running the first business application on an electronic computer. A payroll system was run on Lyons Electronic Office (LEO) a computer system designed by Maurice Wilkes who had previously worked on EDSAC.
Sep 1951	UK	The oldest known recordings of computer generated music were played by the Ferranti Mark 1 computer. The Mark 1 is a commercial version of the Baby Machine from the University of Manchester. The music program was written by Christopher Strachey.
1951	USA	EDVAC (electronic discrete variable computer). The first computer to use Magnetic Tape. EDVAC could have new programs loaded from the tape. Proposed by John von Neumann, it was installed at the Institute for Advance Study, Princeton, USA.
1951	Australia	CSIRAC used to play music – the first time a computer was used as a musical instrument.
1951	USA	The A-0 high level compiler is invented by Grace Murray Hopper.
April 1952	USA	IBM introduces the IBM 701, the first computer in its 700 and 7000 series of large scale machines with varied scientific and commercial architectures, but common electronics and peripherals. Some computers in this series remained in service until the 1980s.
June 1952	USA	IAS machine completed at the Institute for Advanced Study, Princeton, USA (by Von Neumann and others).
1952	USSR	BESM-1 is completed. Only one BESM-1 machine was built. The machine used approximately 5,000 vacuum tubes.
1953	UK	The University of Manchester team complete the first transistorised computer.
1953	USA	Arthur Andersen was hired to program the payroll for General Electric (GE)'s Appliance Park manufacturing facility near Louisville, Kentucky. As a result, GE purchased UNIVAC I which became the first-ever commercial computer in the USA. Joe Glickauf was Arthur Andersen's project leader for the GE engagement.
1953	World	Estimate that there are 100 computers in the world.
1953	USA	Magnetic core memory developed.
1954	USA	FORTRAN (FORmula TRANslation), the first high-level programming language development, was begun by John Backus and his team at IBM The development continued until 1957. It is still in use for scientific programming. Before being run, a FORTRAN program needs to be converted into a machine program by a compiler, itself a program.
1954	USA	The IBM 650 is introduced. A relatively inexpensive decimal machine with drum storage, it becomes the first mass-produced computer, with some 2000 installations.
December 1954	USA	The NORC was delivered by IBM to the US Navy.
1956	USA	First conference on artificial intelligence held at Dartmouth College in New Hampshire.
1956	USA	The Bendix G-15 computer was introduced by the Bendix Corporation
1956	NED	Edsger Dijkstra invented an efficient algorithm for shortest paths in graphs as a demonstration of the abilities of the ARMAC computer. The example used was the Dutch railway system. The problem was chosen because it could be explained quickly and the result checked. Although this is the main thing many people will remember Dijkstra for, he also made important contributions to many areas of computing – in particular he should be remembered for his work on problems relating to concurrency, such as the invention of the semaphore.
1957	USA	First dot matrix printer marketed by IBM.
1957	USA	FORTRAN development finished. See 1954.
1957	USA	I have travelled the length and breadth of this country and talked with the best people, and I can assure you that data processing is a fad that won't last out the year. — Editor in charge of business books for Prentice Hall.
1958	USA	Programming language LISP (interpreted) developed, Finished in 1960. LISP stands for 'LISt Processing'. Used in A.I. development. Developed by John McCarthy at Massachusetts Institute of Technology.
1958	USSR	Setun, a balanced ternary computer developed in 1958 at Moscow State University.
12 Sep 1958	USA	The integrated circuit invented by Jack Kilby at Texas Instruments. Robert Noyce, who later set up Intel, also worked separately on the invention. Intel later went on to perfect the microprocessor. The patent was applied for in 1959 and granted in 1964. This patent wasn't accepted by Japan so Japanese businesses could avoid paying any fees, but in 1989 – after a 30-year legal battle – Japan granted the patent; so all Japanese companies paid fees up until the year 2001 – long after the patent became obsolete in the rest of the World.
1959	World	Computers introduced between 1959 and 1964, often regarded as Second Generation computers, were based on discrete transistors and printed circuits – resulting in smaller, more powerful and more reliable computers.
1959	USA	COBOL (COmmon Business-Oriented Language) developed by Grace Murray Hopper as the successor to FLOW-MATIC, finished in 1961.
1959	USSR	Minsk mainframe computer development and production begun in the USSR. Stopped in 1975.

1960s

Date	Place	Event
1960	USA EUR	ALGOL, first structured, procedural, programming language to be released.
1960	UK	Compiler compiler, first compiler compiler is released.
1961	USA	APL programming language released by Kenneth Iverson at IBM.
1962	UK	ATLAS is completed by the University of Manchester team. This machine introduced many modern architectural concepts: spooling, interrupts, pipelining, interleaved memory, virtual memory and paging. It was the most powerful machine in the world at the time of release.
1962	USA	Work begun on the Linc, the brainchild of the M.I.T. physicist Wesley A. Clark in May 1961. It was the first functional prototype of a computer scaled down to be optimized and priced for the individual user. Used for the first time at the National Institutes of Mental Health in Bethesda, Maryland in 1963, many consider it to be the first personal computer.
1962	USA	Spacewar!, an early and highly influential computer game, is written by MIT student Steve Russell. The game ran on a DEC PDP-1, competing players fired at each other's space ships using an early version of joystick.
1962	?	The AN/UYK-1 computer was designed with rounded edges to fit through the hatch of ballistic missile submarines, as part of the first satellite navigation system, Transit.
1963	USA	Mouse conceived by Douglas Engelbart The Mouse was not to become popular until 1983 with Apple Computer's Lisa and Macintosh and not adopted by IBM until 1987 – although compatible computers such as the Amstrad PC1512 were fitted with mice before this date.
1964	USA	Computers built between 1964 and 1972 are often regarded as 'Third Generation' computers, they are based on the first integrated circuits – creating even smaller machines. Typical of such machines was the IBM System/360 series mainframe, while smaller minicomputers began to open up computing to smaller businesses.
1964	USA	Programming language PL/I released by IBM.
1964	USA	Launch of IBM System/360 – the first series of compatible computers, reversing and stopping the evolution of separate "business" and "scientific" machine architectures; all models used the same basic instruction set architecture and register sizes, in theory allowing programs to be migrated to more or less powerful models as needs changed. The basic unit of memory, the "byte", was defined as 8 bits, with larger units such as "words" defined with sizes that were multiples of 8, with many consequences. Many competing computers at the time used word sizes that were multiples of 6. The marketing term "IBM Compatible" was often used, at this time, to indicate that the architecture used 8-bit bytes. Over 14,000 were shipped by 1968.
1964	USA	Project MAC begun at MIT by J.C.R. Licklider: several terminals all across campus will be connected to a central computer, using a timesharing mechanism. Bulletin boards and email are popular applications.
1964	USA	Sabre (computer system) launched.[1]
1965	USA	DEC PDP-8 Mini Computer. The first minicomputer, built by Digital Equipment (DEC). It cost US$16,000.
1965	USA	Moore's law published by Gordon Moore. Originally suggesting processor complexity doubled every year. It was published in the 35th Anniversary edition of Electronics magazine. The law was revised in 1975 to suggest a doubling in complexity every two years.
1965	USA	Fuzzy logic designed by Lofti Zadeh (University of California, Berkeley), it is used to process approximate data – such as 'about 100'.
1965	USSR	BESM-6 mainframe computer was designed in the USSR.
1965	USA	Programming language BASIC (Beginners All Purpose Symbolic Instruction Code) developed at Dartmouth College, USA, by Thomas E. Kurtz and John George Kemeny. BASIC was not implemented on microcomputers until 1975. This was the first language designed to be used in a time-sharing environment, such as DTSS (Dartmouth Time-Sharing System), or GCOS.
1965	USA	Packet switching, funded by ARPA was developed. This makes reliable computer networking possible. The first computer-to-computer login does not occur until November 21, 1969, between Stanford and UCLA.
1965	USA	The first supercomputer, the Control Data CDC 6600, was developed.
1966	USA	Hewlett-Packard entered the general purpose computer business with its HP-2115 for computation, offering power formerly found only in much larger computers. It supported a wide variety of languages, among them ALGOL, BASIC, and FORTRAN.
1967	USA/CH	Development of programming language Pascal begun, continued in Switzerland from 1968 to 1971.[2] Based on ALGOL. Developed by Niklaus Wirth as a pedagogic tool.
1967	USA	The floppy disk is invented at IBM by David Noble, under the direction of Alan Shugart, for use with the System/370. License royalties are paid to Doctor Yoshiro Nakamatsu in Tokyo, who claimed he got the idea for the floppy disk in 1950.
1968	USA	Intel founded by Robert Noyce and a few friends.
1968	USA	Programming language LOGO developed by Seymour Papert and team at MIT.
1968	USA	“ But what ... is it good for? ” — Engineer at the Advanced Computing Systems Division of IBM commenting on the microchip.
2 Oct 1968	GER	First computer ball mouse offered by Telefunken.[3][4] The device named Rollkugel RKS 100-86 is based on "reversing" an earlier trackball-like device (also named Rollkugel) embedded into radar flight control desks, which had been developed around 1965 by a team led by Rainer Mallebrein at Telefunken Konstanz for the German Bundesanstalt für Flugsicherung as part of their TR 86 process computer system with its SIG 100-86[5] vector graphics terminal.
9 Dec 1968	USA	Douglas Engelbart demonstrates interactive computing, at the Fall Joint Computer Conference in San Francisco: mouse, on-screen windows, hypertext and full-screen word processing.
1969	USA	ARPANET begun by the United States Department of Defense for research into networking. It is the original basis for what now forms the Internet. It was opened to non-military users later in the 1970s and many universities and large businesses went on-line.
1969	USA	Development of UNIX operating system begun.[6] It was later released as C source code to aid portability, and subsequently versions are obtainable for many different computers, including the IBM PC. It and its clones (such as GNU/Linux) are still widely used on network servers and scientific workstations. Originally developed by Ken Thompson and Dennis Ritchie.
7 Apr 1969	USA	The first Request for Comments, RFC 1 published. The RFCs (network working group, Request For Comment) are a series of papers which are used to develop and define protocols for networking; originally the basis for ARPANET, there are now thousands of them applying to all aspects of the Internet. Collectively they document everything about the way the Internet and computers on it should behave, whether its TCP/IP networking or how email headers should be written there will be a set of RFCs describing it.
1969	?	Introduction of the RS-232 (serial interface) standard by EIA (Electronic Industries Association), one of the oldest serial interfaces still (uncommonly) in use today.
1969	USA	Data General shipped a total of 50,000 Novas at US$8,000 each. The Nova was one of the first 16-bit minicomputers and led the way toward word lengths that were multiples of the 8-bit byte. It was first to employ medium-scale integration (MSI) circuits from Fairchild Semiconductor, with subsequent models using large-scale integrated (LSI) circuits. Also notable was that the entire central processor was contained on one 15-inch printed circuit board.

1970s

Date	Place	Event
Oct 1970	USA	First dynamic RAM chip introduced by Intel. It was called the 1103 and had a capacity of 1 Kbit, 1024 bits.
1970	USA	Programming language Forth developed. A simple, clean, stackbased design, which later inspired PostScript and the Java virtual machine.
Jun 1970	USA	AiResearch and American Microsystems develop the MP944, one of the candidates for first microprocessor, for the F-14A Tomcat fighter jet.
1971	USA	CTC ships the Datapoint 2200, a mass-produced programmable terminal. Its multi-chip CPU provided the basis for the Intel 8008. A monitor and cassette drives were built-in, and the entire system fit the approximate footprint of an IBM Selectric typewriter. Users quickly began to use the system as a standalone computer - one of the earliest to arguably qualify as a personal computer.
1971	USA	Kenbak-1 ships. This small, cheap (US$750) personal computer, build using pre-microprocessor TTL technology, is one clear candidate for "first personal computer", and is so considered by the Computer History Museum and the American Computer Museum.[7]
1971	USA	Ray Tomlinson develops the first program that can send email messages, via the Arpanet, between people using different computers. (Programs existed previously that could send such messages between users logging onto the same computer.)
15 Nov 1971	USA	The Intel 4004, the first commercially available microprocessor, is released. It contains the equivalent of 2,300 transistors and was a 4-bit processor. It is capable of around 60,000 instructions per second (0.06 MIPS), running at a maximum clock speed of 740 kHz.
1971	USA	Texas Instruments releases the first easily portable electronic calculator.
1971		8-inch floppy disk introduced.[8]
1972	USA	Atari founded by Nolan Bushnell and Ted Dabney, (see also 1972).
1972	USA	Pong released – widely recognised as the first popular arcade video game. It was invented by Allan Alcorn.
1972	?	Computers built after 1972 are often called 'fourth generation' computers, based on LSI (Large Scale Integration) of circuits (such as microprocessors) – typically 500 or more components on a chip. Later developments include VLSI (Very Large Scale Integration) of integrated circuits 5 years later – typically 10,000 components. The fourth generation is generally viewed as running right up until the present, since although computing power has increased the basic technology has remained virtually the same.
1972	USA	Programming language C developed at The Bell Laboratories in the USA Dennis Ritchie, one of the inventors of the Unix operating system, simplifies BCPL into a language he calls B, then iterates B into C. It is a very popular language, especially for systems programming – as it is flexible and fast. C was considered a refreshing change in the computing industry because it helped introduce structured programming. Inspired by C, C++, was introduced in the 1980s, and in turn helped usher in the era of object-oriented programming.
1972	USA	First handheld scientific calculator released by Hewlett-Packard, the engineer's slide rule is at last obsolete.
1 Apr 1972	USA	8008 microprocessor released by Intel.
1972	USA	The first international connections to ARPANET are established. ARPANET later became the basis for what we now call the Internet.
1972	NOR	Norsk Data launches the Nord-5, the first 32-bit supermini computer.
1972	USA	In 1972-1973 IBM Los Gatos Scientific Center developed a portable computer prototype called SCAMP (Special Computer APL Machine Portable) based on the IBM PALM processor with a Philips compact cassette drive, small CRT and full function keyboard. SCAMP emulated an IBM 1130 minicomputer in order to run APL\1130.[9] Because it was the first to emulate APL\1130 performance on a portable, single-user computer, PC Magazine in 1983 designated SCAMP a "revolutionary concept" and "the world's first personal computer".[9][10] The prototype is in the Smithsonian Institution.
1973	USA	Development of the TCP/IP protocol suite by a group headed by Vinton Cerf and Robert E. Kahn. These are the protocols used on the internet.
1973	FRA	Programming language Prolog developed at the University of Luminy-Marseilles in France by Alain Colmerauer. It introduced the new paradigm of logical programming and is often used for expert systems and AI programming.
1973	USA	The TV Typewriter, designed by Don Lancaster, provided the first display of alphanumeric information on an ordinary television set. It used US$120 worth of electronics components. The original design included two memory boards and could generate and store 512 characters as 16 lines of 32 characters. A 90-minute cassette tape provided supplementary storage for about 100 pages of text.
1973	USA	Ethernet developed, this became a popular way of connecting PCs and other computers together – to enable them to share data, and devices such as printers. A group of machines connected together in this way is known as a LAN.
1974	UK	CLIP-4, the first computer with a parallel architecture.
1974	CAN	The MCM/70, a candidate for first personal computer, is released by Micro Computer Machines of Canada. It failed commercially, despite weighing just 20 pounds and featuring a plasma display and a ROM-based APL programming language interpreter.
1 Apr 1974	USA	Introduction of the 8080. It ran at a clock frequency of 2 MHz and did 0.64 MIPS.
1974	USA	Motorola announces the MC6800 8-bit microprocessor. It is more easy to implement than the 8080 because it only needs a single power supply to operate and does not need support chips. Unlike the 8080 it is sold not as much as a general purpose "number cruncher / computer" CPU core but more as a control processor for industrial control and as a peripheral processor.
1974	USA	Engineers Chuck Peddle and Bill Mensch leave Motorola after completing work on the 6800 CPU and join MOS Technology, Inc.
9 Oct 1974	UK	ICL launches its New Range of mainframes, the ICL 2900 Series.
1975	USA	The MITS Altair 8800, the first commercially successful hobby computer, is released. An article in Popular Electronics (January 1975), described the computer and invited people to order kits. Despite the limited processing power, input/output system (blinkenlights and toggle switches) and memory (256 bytes), around 200 were ordered on the first day. 10,000 units were eventually shipped at a kit price of US$397 each. Numerous companies produced clones based on the "S-100 bus" (the Altair's main bus).
1975	USA	First microcomputer implementation of BASIC by Bill Gates and Paul Allen, it was written for the MITS Altair, this led to the formation of Microsoft later in the year.
1975	USA	Unix marketed (see 1969).
1975	NOR	Norwegian company Mycron releases its MYCRO-1, the first single-board computer.
1975	USA	Formation of Microsoft by Bill Gates and Paul Allen.
1975	USA	MOS Technology, Inc. releases their 6501 CPU. which is pin compatible with Motorola's 6800, who soon starts a lawsuit against them. The 6501 is quickly withdrawn from sale and replaced with the 6502 which has a "lawsuit-compatible"[11] design, but is otherwise nearly identical to the 6501. The 6502 becomes one of the most popular CPUs for the next 10 years and is used in many computers and game consoles (most notably the Atari 2600, Apple II, the Commodore PET, VIC-20 and Commodore 64, the Acorn Electron/BBC Microcomputer, and the Nintendo Entertainment System/NES).
1975	USA	IBM 5100 computer released; with integrated keyboard, display, and mass storage on tape, it resembles the personal computers of a few years later, although it does not use a microprocessor.
Nov 1975	USA	Zilog is founded by ex-Intel employees.
1 Apr 1976	USA	Apple Computer, Inc. founded, to market the Apple I single-board computer designed by Steve Wozniak and Steve Jobs. It uses the MOS Technology 6502 microprocessor.
1976	USA	First laser printer introduced by IBM – the IBM 3800. The first colour versions came onto the market in 1988.
1976	USA	Introduction of the Intel 8085 chip. An improved version of the 8080, with a superset of the 8080s instruction set (only a couple of extra instructions). Single 5V power supply (while the 8080 needed several different voltages).
1976	USA	Z80 chip released by Zilog. It was a superset of the 8080 chip with additional registers and instructions, and using only one power supply voltage. CP/M was originally written for the 8080, but many implementations used the Z80. The Z80 was the processor for home computers like the Tandy TRS-80 of 1977, the Sinclair ZX Spectrum of 1982 and many others.
1976	USA	MOS Technology, Inc introduces the KIM-1 microcomputer system as a demonstrator for its 6502 CPU.
1976	USA	Cray-1 supercomputer was invented by Seymour Cray. He left Control Data in 1972 to form his own company. This machine was known as much for its horseshoe-shaped design as it was for being the first supercomputer to make vector processing practical. 85 were shipped at a cost of US$5 million each.
1976	USA	Commodore buys MOS Technology, Inc in a stock trade. MOS is valued at US$12 million. Chuck Peddle joins Commodore as chief engineer. With the purchase of MOS, Commodore begins work on the Commodore PET.
1976	USA	Emacs text editing software created.[6]
1976		"5.25 inch floppy disks are introduced. When this product reaches the PC market it causes an explosive growth in digital information storage."[8]
1977	USA	Commodore introduces the Commodore PET. It comes with 4 KB or 8 KB of RAM, and an integrated cassette deck and 9" monochrome monitor.
1977	USA	“ There is no reason anyone would want a computer in their home. ” — Ken Olsen, founder, president, and chairman of Digital Equipment Corporation.
5 Jun 1977	USA	Apple II computer introduced based on an 8-bit MOS Technology 6502 microprocessor running at 1 MHz with 4 KB of RAM. It had an open architecture, used color graphics, and an audio cassette interface for loading programs and storing data. Later, in July 1978, a floppy disk drive was made available with an elegantly designed interface.[12][13] One of the first examples of a "killer app" (for the business world) was released for it—the VisiCalc spreadsheet program – in 1979.
Aug 1977	USA	Tandy brought out the TRS-80 with "Level I BASIC". Although the TRS-80 had a primitive 4K BASIC (a stripped down version of the public domain "Li-Chen Wang Basic") and abysmal graphics it still became a bestseller quickly.
Sep 1977	USA	Heathkit made the H8 Home computer kit available. It was based on an Intel 8080a processor and shipped with HDOS a Heathkit Disk Operating System and Benton Harbor BASIC.
1978	USA	Tandy upgraded the TRS-80 with a much improved Microsoft 8K "Level II BASIC", and an "expansion interface" which added 32 KB RAM, A floppy disk and a printer interface. With these extras the TRS-80 became a viable small business computer.
8 Jun 1978	USA	Introduction of the 16-bit Intel 8086, the first x86 microprocessor. The available clock frequencies were 5, 8 and 10 MHz, with an instruction set of about 300 operations. At its introduction, the fastest 8086 available was the 8 MHz version which achieved 0.8 MIPS and contained 29,000 transistors. Over three decades later, x86 remains the most popular and commercially successful instruction set architecture in the history of personal computing.
1978	JAP	The Arcade Video game 'Space Invaders' is released, sparking a video game craze. In 1979, Atari's Asteroids would prove to be incredibly popular.
1979	USA	Programming language Ada introduced by Jean Ichbiah and team at Honeywell for the US Department of Defense.
1 Jun 1979	USA	Introduction of the Intel 8088, compatible with the 8086 with an 8-bit data bus – but this makes it cheaper to implement in computers. Chosen for the IBM PC, Intel processors were found in millions of IBM-PC compatible computers.
1979	UK	Commodore PET released in the United Kingdom. Based on a 1 MHz 6502 processor it displayed monochrome text and had just 8 KB of RAM. Priced £569. For £776 you could purchase a version with 16 KB of RAM, while for £914 you could get a 32 KB of RAM.
1979	NED JAP	Compact disc was invented.
1979	USA	The 68000 Microprocessor launched by Motorola, the first of the 68k family. 5+ years later it was used in machines such as the Apple Macintosh, the Atari ST and the Commodore Amiga.
1979	USA	Shortly after the release of V7 Unix, which included UUCP, a protocol for communication over standard telephone lines, Tom Truscott and Jim Ellis created Usenet, a global discussion group system. Nowadays, it uses Internet protocols and is still popular.
1979	USA	Four disgruntled Atari programmers leave and form Activision, the first third-party video game software publisher. Activision promotes both the game and the programmer, changing the way software is marketed.
1979	USA	Texas Instruments releases the TI-99/4 microcomputer. This system generally used audio cassettes to store information, along with ROM modules, similar to gaming units, to hold commercial software. Additionally, TI made available a speech synthesizer, based on their own chip, for the TI-99/4 and its successor, the 4A.
1979	USA	VisiCalc spreadsheet software released.[1]
1979	USA	WordStar word processing software released.[1]
Nov 1979	USA	Atari releases the Atari 400/800, a high-performance game-oriented home computer based on the 6502 microprocessor.

See also

• Information revolution

References

1. Matthew Kirschenbaum (July 2013), "10 Most Influential Software Programs Ever", Slate, USA
2. Stefan Betschon: Der Zauber des Anfangs - Schweizer Computerpioniere. In: Ingenieure bauen die Schweiz. Franz Betschon et al. (editors), pp. 376–399, Verlag Neue Zuercher Zeitung, Zurich 2013, ISBN 978-3-03823-791-4
3. "Auf den Spuren der deutschen Computermaus" [In the footsteps of the German computer mouse] (in German). Heise Verlag. 2009-04-28. Retrieved 2013-01-07.
4. "Telefunken's 'Rollkugel'". oldmouse.com.
5. "SIG-100 video terminal and mouse".
6. Paul Ford (April 2014), The Great Works of Software – via Medium
7. "The man who made 'the world's first personal computer'", BBC News, 6 November 2015
8. Cornell University Library (2003). "Digital Preservation and Technology Timeline". Digital Preservation Management. USA. Retrieved August 2015. Check date values in: |access-date= (help)
9. IBM Archives
10. Friedl, Paul J. (November 1983). "SCAMP: The Missing Link In The PC's Past?". PC. pp. 190–197. Retrieved 8 January 2015.
11. see 6502 microprocessor history
12. Steven Weyhrich (28 December 2001). "Apple II History Chapter 5, The Disk II". Retrieved 27 November 2008.
13. Christopher Null (April 2007), "50 Best Tech Products of All Time", PC World, USA

External links

• A Brief History of Computing, by Stephen White. An excellent computer history site; the present article is a modified version of his timeline, used with permission.