Complete History — Abacus to AI (2400 BC → 2026)

Computing did not start with electricity. For 4,000 years humans built tools to count faster — beads, gears, punched cards, relays — before the first vacuum-tube machines of the 1940s. Each era solved one problem of the previous era: too slow, too big, too hot, too expensive, too hard to program.

1. c. 2400 BC
   Abacus (Mesopotamia / China / Rome)
   First calculating tool — beads on rods. Still used in Japan (soroban) and for mental-math training. Hindi: गिनतारा.
2. c. 100 BC
   Antikythera Mechanism (Greece)
   Bronze geared device that predicted eclipses and planet positions — the world's first analog computer, 37+ gears.
3. 1614
   Logarithms — John Napier
   Napier's Bones: rods that turn multiplication into addition. Basis of the slide rule (used till 1970s by engineers and Apollo astronauts).
4. 1642
   Pascaline — Blaise Pascal
   First mechanical adding machine (geared wheels, 8 digits). Built at age 19 to help his tax-collector father. Programming language 'Pascal' is named after him.
5. 1673
   Stepped Reckoner — Gottfried Leibniz
   Could add, subtract, multiply, divide. Leibniz also described the binary number system (1703) that every computer uses today.
6. 1801
   Jacquard Loom — Joseph Marie Jacquard
   Punched cards controlled weaving patterns — the first 'stored program' idea. Inspired Babbage and later IBM.
7. 1822–1837
   Difference Engine & Analytical Engine — Charles Babbage
   Analytical Engine design had a Mill (CPU), Store (memory), Reader (input: punched cards) and Printer (output) — the full architecture of a modern computer, in brass and steam. Never fully built in his lifetime.
8. 1843
   First program — Ada Lovelace
   Wrote an algorithm to compute Bernoulli numbers for the Analytical Engine → the world's first computer programmer. Language 'Ada' honours her.
9. 1854
   Boolean Algebra — George Boole
   Logic with only TRUE/FALSE (1/0) — the mathematics behind every logic gate and 'if' statement.
10. 1890
    Tabulating Machine — Herman Hollerith
    Punched cards + electricity counted the US census in 2.5 years instead of 8. His company became IBM (1924).
11. 1936
    Turing Machine — Alan Turing
    Mathematical model of a universal computer. Defined what 'computable' means; the Turing Test (1950) defined machine intelligence.
12. 1937–42
    Atanasoff–Berry Computer (ABC)
    First electronic digital computer (USA, Iowa State). Used vacuum tubes and binary, but was not programmable. Weight ≈ 320 kg.
13. 1938–41
    Z1 / Z3 — Konrad Zuse (Germany)
    Z3 (1941): first programmable, fully automatic digital computer. 2,600 relays, 22-bit words, 5–10 Hz clock, ~1 tonne. Zuse also wrote the first high-level language, Plankalkül.
14. 1943–45
    Colossus (UK, Bletchley Park) — Tommy Flowers
    First programmable electronic computer; 1,600–2,400 vacuum tubes; broke German Lorenz ciphers; kept secret till the 1970s.
15. 1944
    Harvard Mark I (IBM ASCC) — Howard Aiken
    Electromechanical, 15.5 m long, 2.4 m high, 4.3 tonnes (9,445 lb), 765,000 parts, 800 km of wire. Did 3 additions/second. Grace Hopper worked on it and found the first literal 'bug' (a moth) in Mark II in 1947.
16. 1945
    Von Neumann Architecture — John von Neumann
    EDVAC report: store program AND data in the same memory. Every laptop and phone today is a von Neumann machine.
17. 1946
    ENIAC — Eckert & Mauchly (USA)
    First general-purpose electronic computer. 27 tonnes, 167 m², 150 kW, 17,468 vacuum tubes, 5,000 additions/second. See the 'First Computers' section for every part.
18. 1947
    Transistor — Bell Labs (Bardeen, Brattain, Shockley)
    Replaced the vacuum tube: tiny, cool, reliable. Nobel Prize 1956. The most manufactured object in human history (~10²² made).
19. 1949
    EDSAC (Cambridge) — Maurice Wilkes
    First practical stored-program computer; first program ran 6 May 1949.
20. 1951
    UNIVAC I — first commercial computer
    46 units sold at ~$1 million each; 13 tonnes; 5,200 tubes; predicted the 1952 US election on TV. Also: Ferranti Mark 1 (UK), first commercially available.
21. 1953
    IBM 701 & magnetic core memory
    IBM's first scientific computer; core memory (Forrester, MIT) stored bits as magnetised rings till the 1970s.
22. 1956
    First hard disk — IBM 350 RAMAC
    5 MB on fifty 24-inch platters; weighed over 1 tonne; leased for $3,200/month. Today 5 MB = one phone photo.
23. 1957
    FORTRAN — John Backus (IBM)
    First widely used high-level programming language. COBOL followed in 1959 (Grace Hopper).
24. 1958
    Integrated Circuit — Jack Kilby (TI) & Robert Noyce (Fairchild)
    Many transistors on one silicon chip. Kilby got the Nobel Prize in 2000. Started the third generation.
25. 1964
    IBM System/360 · BASIC · Computer mouse
    System/360 — first 'family' of compatible computers. BASIC at Dartmouth. Douglas Engelbart's wooden mouse (patent 1970).
26. 1965
    Moore's Law — Gordon Moore
    Transistors per chip double every ~2 years. Held for 50+ years (2,300 in 1971 → 200+ billion in 2025).
27. 1969
    ARPANET · UNIX · Man on the Moon
    First message on ARPANET (29 Oct) 'LO' — the internet's birth. UNIX at Bell Labs (Thompson & Ritchie). Apollo Guidance Computer: 32 kg, 2 MHz, 4 KB RAM.
28. 1971
    Intel 4004 · Floppy disk · E-mail
    First microprocessor: 2,300 transistors, 740 kHz, 4-bit — a CPU on one chip. 8-inch floppy (IBM). Ray Tomlinson sent the first e-mail and chose the @ sign.
29. 1972
    C language · Pong · HP-35
    Dennis Ritchie's C (still used in Linux, Windows). First successful video game. First scientific pocket calculator.
30. 1973
    Ethernet · Xerox Alto
    Alto: first computer with GUI, windows, icons and mouse — it inspired the Mac and Windows.
31. 1975
    Altair 8800 · Microsoft founded
    First successful personal-computer kit ($397). Bill Gates & Paul Allen wrote Altair BASIC and founded Microsoft (4 April 1975).
32. 1976–77
    Apple I & Apple II · Cray-1
    Steve Wozniak & Steve Jobs; Apple II made home computing mainstream. Cray-1 supercomputer: 160 MFLOPS, 5.5 tonnes, $8.8 million.
33. 1979
    VisiCalc — first spreadsheet
    The 'killer app' that made businesses buy PCs — ancestor of Excel.
34. 1981
    IBM PC 5150 · MS-DOS
    Intel 8088 @ 4.77 MHz, 16–256 KB RAM, $1,565. 'PC' became a word. MS-DOS from Microsoft.
35. 1983
    TCP/IP · Lisa · Word 1.0
    ARPANET switched to TCP/IP on 1 Jan 1983 — the modern internet begins. Apple Lisa: first commercial GUI PC. Microsoft Word released.
36. 1984
    Apple Macintosh · CD-ROM
    Famous Super Bowl '1984' ad; 128 KB RAM, 9-inch screen, $2,495.
37. 1985
    Windows 1.0 · Excel 1.0 · C++
    Windows ran on top of DOS. Excel first shipped on Mac. Bjarne Stroustrup's C++.
38. 1989–91
    World Wide Web — Tim Berners-Lee (CERN)
    Proposed 1989; first website info.cern.ch went live 6 Aug 1991. HTML, HTTP, URL were born. Also 1991: Linux (Linus Torvalds), Python (Guido van Rossum).
39. 1993
    Mosaic browser · Intel Pentium · PARAM 8000 (India)
    Mosaic made the web visual. Pentium: 3.1 million transistors. C-DAC Pune built India's first supercomputer PARAM 8000 after the US refused to sell a Cray.
40. 1994–95
    Yahoo · Amazon · Windows 95 · Java · JavaScript
    Windows 95: Start button, taskbar, 32-bit. Java (Sun) and JavaScript (Netscape, written in 10 days).
41. 1996–98
    USB · Google · Windows 98 · iMac
    USB 1.0 (1996) standardised all ports. Google founded 4 Sep 1998 by Larry Page & Sergey Brin.
42. 1999–2001
    Wi-Fi · Bluetooth · USB flash drive · Wikipedia · Windows XP · iPod
    Wi-Fi 802.11b (1999), first USB pen drive 8 MB (2000), Wikipedia (Jan 2001), XP (Oct 2001).
43. 2004–06
    Facebook · Gmail · YouTube · Twitter · AWS
    Social media and cloud computing begin. Amazon Web Services (2006) rents computers by the hour.
44. 2007
    iPhone — Steve Jobs
    Multitouch glass smartphone; 'an iPod, a phone, an internet communicator'. 115 g, 3.5-inch screen, 412 MHz CPU, 128 MB RAM.
45. 2008
    Android · Bitcoin whitepaper · Chrome · 3G in India
    First Android phone HTC Dream. Satoshi Nakamoto published Bitcoin (Oct 2008). Google Chrome launched.
46. 2010–12
    iPad · Instagram · Raspberry Pi · 4G
    Raspberry Pi: a $35 computer the size of a credit card (45 g) — sold 60+ million.
47. 2012–16
    Deep-learning revolution
    AlexNet (2012) wins ImageNet using GPUs; AlphaGo beats Lee Sedol (2016); Google TPU (2016).
48. 2017
    Transformer — 'Attention Is All You Need' (Google)
    The neural network architecture behind GPT, Gemini, Claude, BERT — every modern AI chatbot.
49. 2019–20
    Quantum supremacy · Apple M1 · Covid work-from-home
    Google Sycamore (53 qubits) in 2019. Apple M1 (Nov 2020): first ARM-based Mac, 16 billion transistors, 5 nm.
50. 2022
    ChatGPT — OpenAI (30 Nov 2022)
    100 million users in 2 months — fastest-growing app ever. Also: Nvidia H100 GPU (80 billion transistors), Jio 5G in India.
51. 2023
    GPT-4 · Gemini · Apple Vision Pro announced · India's AIRAWAT
    Multimodal AI (text + image). AIRAWAT ranked 75th fastest supercomputer in the world (ISC 2023).
52. 2024
    AI PCs with NPUs · Nvidia Blackwell · Google Willow
    Copilot+ PCs (Snapdragon X, Intel Core Ultra, AMD Ryzen AI) with 40+ TOPS NPUs. Blackwell B200: 208 billion transistors. Willow quantum chip (105 qubits) solved a benchmark in 5 minutes that would take a supercomputer 10²⁵ years.
53. 2025
    Agentic AI · 2 nm chips · El Capitan
    TSMC/Samsung 2 nm mass production; El Capitan (USA) is the fastest supercomputer at ~1.7 exaFLOPS (1.7 × 10¹⁸ operations/second). AI agents that browse, code and book for you.
54. 2026 (today)
    AI in every device
    Phones, laptops, cars and TVs ship with on-device AI models; India's IndiaAI Mission adds 38,000+ GPUs for public use; Indian semiconductor fabs (Dholera, Gujarat) begin trial production.