Before chips, we counted on bones, abaci, and gears
The Lebombo bone, notched some 35,000 years BCE, may be the oldest math artifact. From Babylonian abaci and the Antikythera mechanism to Pascal's calculator and Jacquard's punched cards, hardware history is a long climb from tally sticks to transistors and pocket machines.
Computing hardware begins with aids, not screens. Fingers and tally sticks came first; the Lebombo bone from mountains between Eswatini and South Africa, dated 35,000 BCE, bears twenty-nine deliberate notches on a baboon fibula. Fertile Crescent calculi—clay spheres and cones sealed in hollow vessels—tracked livestock or grain. Counting frames akin to later Roman boards appear in Babylonian use by about 2700–2300 BC. Analog sky machines followed: the Hellenistic astrolabe and Antikythera mechanism (c. 150–100 BC). Hero of Alexandria (c. 10–70 AD) built automata and a programmable cart; the Banū Mūsā brothers' steam-powered automatic flute (850) may be the first programmable device. Ismail al-Jazari's 1206 hydropowered castle clock is called the first programmable analog computer.
Logarithms remade calculation. John Napier showed multiplication and division could become addition and subtraction of logs, and designed Napier's bones to ease the grind. Slide rules followed in the 1620s: Edmund Gunter's single log scale at Oxford, then William Oughtred's circular rule in 1630 and the modern two-rule slide rule in 1632—tools engineers used until pocket calculators arrived. Guidobaldo del Monte documented geared mechanical calculation in 1609. Wilhelm Schickard designed a 1623 machine marrying mechanized Napier's rods to an adding base, but fire destroyed at least one in 1624. Teenage Blaise Pascal, after three years and fifty prototypes, invented his calculator in 1642 and built twenty Pascalines over the next decade; nine survive. Leibniz's stepped reckoner (around 1672) aimed at multiplication and division and described binary—yet many designs into the 1940s, including Babbage's 1822 machines and ENIAC (1945), stayed decimal.
Mass production and programmability closed the mechanical age. Around 1820, Charles Xavier Thomas de Colmar's Arithmometer became the century's first successful mass-produced mechanical calculator. Joseph Marie Jacquard's 1804 loom controlled weave patterns with punched-card paper tape—a landmark in programmability. In the late 1880s Herman Hollerith stored data on punched cards readable by machine; his method processed the 1890 U.S. census two years faster than the prior count, and his firm became IBM's core. By 1920 electromechanical tabulators could add, subtract, and print totals; when Social Security began in 1935, IBM card systems handled twenty-six million workers' records. Human "computers," often women, ran motorized calculators. The British Bell Punch ANITA (1961) was the first all-electronic desktop calculator; Friden's transistorized EC-130 followed in June 1963. MOS LSI then unlocked semiconductor memory, the microprocessor, and the 1970s personal computer—after which 1990s PCs and 2000s mobiles made calculation everyday.
Source: History of computing hardware
