Pascal’s calculating machine around 1600

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Presentation transcript:

Antikythera mechanism discovered in the sea off the island of Antikythera

Pascal’s calculating machine around 1600 Pascal’s calculating machine around 1600. Each dial turns the dial to the left one unit in a full rotation, an adding machine.

Leibniz’s stepped reckoner Leibniz’s stepped reckoner. An early difference engine, could multiply and divide as well as add and subtract. About 1670.

The Jacquard loom invented about 1800 used punched cards and is the forerunner of punched computer cards and Hollerith code.

Babbage’s difference engine designed around 1850 and built in 2002 Babbage’s difference engine designed around 1850 and built in 2002. The first automatic computing engine.

The slide rule, beloved by many in their sixties The slide rule, beloved by many in their sixties. Developed by Oughtred 1630 following work by Napier on logarithms.

Roman abacus.

Brunsviga calculating machines

The World’s first electronic all purpose computer, a truly digital machine. Built 1946 and acquired a 100 byte memory 7 years later. Used 20 000 valves and weighed 30 tons.

The TI Nspire using Jack Kilby integrated circuits The TI Nspire using Jack Kilby integrated circuits! Far more powerful than Eniac.

A Cray supercomputer, but still not AI A Cray supercomputer, but still not AI. This is the Cray 1, 64 bit words with a mega-word of RAM. Built in this shape to keep the wires as short as short as possible and so increase processing speed to 80 MHz. Still a long way off to-days laptops.