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Stepped Reckoner
Invented by Gottried Leibniz, which is able to do multiplication, division, and square roots. The machine used the decimal number system. -
Diffenrence Engine
Charles Babbage designed a steam-powered calculater in 1821, but was nevered completed until in 2002 in London. -
Hollerith desk
Herman Hollerith invented the hollerith desk, an electric tabulating machine -
ABC Computer
The ABC, invented by John Atanasoff used 30 add-subtract circuits for solving equations. -
Z1
Konrad Zuse invened Z1, The first freely poammable computer. The Z1, is capable of more complex operations such as multiplication (by repeated additions) and division (by repeated subtractions). Z1 had nine instructions and its CPI ranged from 1 to 20. -
Z2
Also invented by Konrad ZUsehe Z2’s arithmetic unit consisted of a 16-bit fixed-point engine.
The memory is smaller than the Z1.But the Z2 is faster then Z1 -
Z3
Konrad Zuse continued his work with the Z3 that uses 2,300 relays, performs floating point binary arithmetic, and has a 22-bit word length. The Z3 was used for aerodynamic calculations but was destroyed in a bombing raid on Berlin in late 1943. Zuse later sreconstructed the Z3 in the 1960s. -
Colossus
Designed by British engineer Tommy Flowers, the Colossus was designed to break the coded messages used by the Nazis during World War II. It used as many as 2,500 vacuum tubes and a series of pulleys that transported continuous rolls of punched paper tape containing possible solutions to a particular code. Colossus reduced the time to break messages from weeks to hours. -
ENIAC
In 1942, John Mauchly proposed an all-electronic calculating machine. The U.S. Army, meanwhile, needed to calculate complex wartime ballistics tables. Proposal met patron.The result was ENIAC, built between 1943 and 1945. It was the first large-scale computer to run at electronic speed without being slowed by any mechanical parts. -
SSEM
Frederic Williams, Tom Kilburn, and Geoff Toothill develop the Small-Scale Experimental Machine (SSEM). SSEM was built to test a new memory technology developed by Williams and Kilburn -- soon known as the Williams Tube – which was the first electronic random access memory for a computer. The first program, consisting of seventeen instructions and written by Kilburn, which ran on June 21, 1948. This was the first program to ever run on an electronic stored-program computer. -
EDSAC
Electronic Delay Storage Automatic Calculator was an early British computer. Invented by Cambridge University, it stored on punched paper tapes and was used for performing common repetitive calculations within a lager program. -
UNIVAC
UNIVAC was designed by J. Presper Eckert and John Mauchly. First commercial computer -
MADDIDA
MADDIDA is a digital drum-based differential analyzer. This type of computer was useful in performing many of the mathematical equations scientists and engineers encounter in their work. Floyd Steele developed it for a nuclear missile design project -
IAS
The IAS computer was designed for scientific calculations and it performed essential work for the US atomic weapons program by John von Neumann. -
SAGE operating system
The first large-scale computer communications network, SAGE connects 23 computer sites in the US and Canada. Its task was to detect incoming Soviet bombers and direct interceptor aircraft to destroy them. -
Spacewar Computer game
Invented by Steve Russell and MIT, they created the first computer game. -
DRAM or RAM
Invented by Robert Dennard, DRAM (dynamic random access memory) was one of the most signifcant computer advances. -
HP-35
ability to perform a broad variety of logarithmic and trigonometric functions, to store more intermediate solutions for later use, and to accept and display entries in a form similar to standard scientific notation. Designed by HP employees -
Altair
The Altair was invented by hobbyists, that created the first computer sold to individuals. There was no keyboard or screen, so information was entered through clicking switches on the front of the machine. -
Cray 1
The fastest machine of its day, The Cray-1's speed comes partly from its shape, a C,which reduces the length of wires and the time signals need to travel across them. High packaging density of integrated circuits and a novel Freon cooling system also increased the speed. Invented by Crays research. -
Apple 1
Steve Wozniak, desgned and built the Apple 1, while Steve Jobs advertised. It was the first personal computer and it had a built-in keyboard, a storage unit and a plug to plug in your tv. -
Apple 2
Steve Woznaik wanted to improve Apple 1 so he invented Apple 2. It was sold with a main logic board, switching power supply, keyboard, case, manual, game paddles, and cassette tape. When connected to a color television set, the Apple 2 produced brilliant color graphics for the time. Millions of Apple 2s were sold between 1977 and 1993, making it one of the longest-lived lines of personal computers. -
IBM PC
The first IBM PC was released with open architecture, which means, that the design, was availible to competing companies. -
Bones carved with notches
Found in Europe between 30,000-20,000 BCE, The notches were in groups of fiv which is the tally system -
Abacus
The Abacus was invented around 3,000 BCE in Babylonia. It uses small stones, pebbles, rings or bads lined up in columns, that slide over rods in a frame
