History of Computers.pdf

CSCA0101 Computing Basics CSCA0101 COMPUTING BASICS Chapter 1 History of Computers 1 CSCA0101 Computing Basics History of Computers Topics 1. Definition of computer...

CSCA0101 Computing Basics CSCA0101 COMPUTING BASICS Chapter 1 History of Computers 1 CSCA0101 Computing Basics History of Computers Topics 1. Definition of computer 2. Earliest computer 3. Computer History 4. Computer Generations 2 CSCA0101 Computing Basics History of Computers Definition of Computer Computer is a programmable machine. Computer is a machine that manipulates data according to a list of instructions. Computer is any device which aids humans in performing various kinds of computations or calculations. 3 CSCA0101 Computing Basics History of Computers Definition of Computer Three principles characteristic of computer: It responds to a specific set of instructions in a well- defined manner. It can execute a pre-recorded list of instructions. It can quickly store and retrieve large amounts of data. 4 CSCA0101 Computing Basics History of Computers Earliest Computer Originally calculations were computed by humans, whose job title was computers. These human computers were typically engaged in the calculation of a mathematical expression. The calculations of this period were specialized and expensive, requiring years of training in mathematics. The first use of the word "computer" was recorded in 1613, referring to a person who carried out calculations, or computations, and the word continued to be used in that sense until the middle of the 20th century. 5 CSCA0101 Computing Basics History of Computers Tally Sticks A tally stick was an ancient memory aid device to record and document numbers, quantities, or even messages. Tally sticks 6 CSCA0101 Computing Basics History of Computers Abacus An abacus is a mechanical device used to aid an individual in performing mathematical calculations. The abacus was invented in Babylonia in 2400 B.C. The abacus in the form we are most familiar with was first used in China in around 500 B.C. It used to perform basic arithmetic operations. 7 CSCA0101 Computing Basics History of Computers Abacus Earlier Abacus Modern Abacus 8 CSCA0101 Computing Basics History of Computers Napier’s Bones Invented by John Napier in 1614. Allowed the operator to multiply, divide and calculate square and cube roots by moving the rods John Napier around and placing them in specially constructed boards. Napier’s Bones 9 CSCA0101 Computing Basics History of Computers Slide Rule Invented by William Oughtred in 1622. Is based on Napier's ideas about logarithms. Used primarily for – multiplication William Oughtred – division – roots – logarithms – Trigonometry Not normally used for addition or subtraction. Slide Rule 10 CSCA0101 Computing Basics History of Computers Pascaline Invented by Blaise Pascal in 1642. It was its limitation to addition and subtraction. It is too expensive. Blaise Pascal Pascaline 11 CSCA0101 Computing Basics History of Computers Stepped Reckoner Invented by Gottfried Wilhelm Leibniz in 1672. The machine that can add, subtract, multiply and divide automatically. Gottfried Wilhelm Leibniz Stepped Reckoner 12 CSCA0101 Computing Basics History of Computers Jacquard Loom The Jacquard loom is a mechanical loom, invented by Joseph-Marie Jacquard in 1881. It an automatic loom controlled by punched cards. Joseph-Marie Jacquard Jacquard Loom 13 CSCA0101 Computing Basics History of Computers Arithmometer A mechanical calculator invented by Thomas de Colmar in 1820, The first reliable, useful and commercially successful calculating machine. The machine could perform the Thomas de Colmar four basic mathematic functions. The first mass-produced calculating machine. Arithmometer 14 CSCA0101 Computing Basics History of Computers Difference Engine and Analytical Engine It an automatic, mechanical calculator designed to tabulate polynomial functions. Invented by Charles Babbage in 1822 and 1834 It is the first mechanical computer. Difference Analytical Charles Babbage Engine Engine 15 CSCA0101 Computing Basics History of Computers First Computer Programmer In 1840, Augusta Ada Byron suggests to Babbage that he use the binary system. She writes programs for the Analytical Engine. Augusta Ada Byron 16 CSCA0101 Computing Basics History of Computers Scheutzian Calculation Engine Invented by Per Georg Scheutz in 1843. Based on Charles Babbage's difference engine. The first printing calculator. Per Georg Scheutz Scheutzian Calculation Engine 17 CSCA0101 Computing Basics History of Computers Tabulating Machine Invented by Herman Hollerith in 1890. To assist in summarizing information and accounting. Herman Hollerith Tabulating Machine 18 CSCA0101 Computing Basics History of Computers Havard Mark 1 Also known as IBM Automatic Sequence Controlled Calculator (ASCC). Invented by Howard H. Aiken in 1943 Howard H. Aiken The first electro-mechanical computer. Mark 1 19 CSCA0101 Computing Basics History of Computers Z1 The first programmable computer. Created by Konrad Zuse in Germany from 1936 to 1938. To program the Z1 required that the user insert punch tape into a Konrad Zuse punch tape reader and all output was also generated through punch tape. Z1 20 CSCA0101 Computing Basics History of Computers Atanasoff-Berry Computer (ABC) It was the first electronic digital computing device. Invented by Professor John Atanasoff and graduate student Clifford Berry at Iowa State University between 1939 and 1942. Professor John Atanasoff Atanasoff-Berry Computer 21 CSCA0101 Computing Basics History of Computers ENIAC ENIAC stands for Electronic Numerical Integrator and Computer. It was the first electronic general- purpose computer. Completed in 1946. Developed by John Presper Eckert and John W. Mauchl. ENIAC 22 CSCA0101 Computing Basics History of Computers UNIVAC 1 The UNIVAC I (UNIVersal Automatic Computer 1) was the first commercial computer. Designed by J. Presper Eckert and John Mauchly. UNIVAC 1 23 CSCA0101 Computing Basics History of Computers EDVAC EDVAC stands for Electronic Discrete Variable Automatic Computer The First Stored Program Computer Designed by Von Neumann in 1952. It has a memory to hold both a EDVAC stored program as well as data. 24 CSCA0101 Computing Basics History of Computers The First Portable Computer Osborne 1 – the first portable computer. Released in 1981 by the Osborne Computer Corporation. Osborne 1 25 CSCA0101 Computing Basics History of Computers The First Computer Company The first computer company was the Electronic Controls Company. Founded in 1949 by J. Presper Eckert and John Mauchly. 26 CSCA0101 Computing Basics History of Computers Computer Generations There are five generations of computer: First generation – 1946 - 1958 Second generation – 1959 - 1964 Third generation – 1965 - 1970 Fourth generation – 1971 - today Fifth generation – Today to future 27 CSCA0101 Computing Basics History of Computers The First Generation The first computers used vacuum tubes for circuitry and magnetic drums for memory, and were often enormous, taking up entire rooms. They were very expensive to operate and in addition to using a great deal of electricity, generated a lot of heat, which was often the cause of malfunctions. Vacuum tube 28 CSCA0101 Computing Basics History of Computers The First Generation First generation computers relied on machine language, the lowest-level programming language understood by computers, to perform operations, and they could only solve one problem at a time. Input was based on punched cards and paper tape, and output was displayed on printouts. 29 CSCA0101 Computing Basics History of Computers The Second Generation Transistors replaced vacuum tubes and ushered in the second generation of computers. One transistor replaced the equivalent of 40 vacuum tubes. Allowing computers to become smaller, faster, cheaper, more energy-efficient and more reliable. Still generated a great deal of heat Transistor that can damage the computer. 30 CSCA0101 Computing Basics History of Computers The Second Generation Second-generation computers moved from cryptic binary machine language to symbolic, or assembly, languages, which allowed programmers to specify instructions in words. Second-generation computers still relied on punched cards for input and printouts for output. These were also the first computers that stored their instructions in their memory, which moved from a magnetic drum to magnetic core technology. 31 CSCA0101 Computing Basics History of Computers The Third Generation The development of the integrated circuit was the hallmark of the third generation of computers. Transistors were miniaturized and placed on silicon chips, called semiconductors, which drastically increased the speed and efficiency of computers. Much smaller and cheaper compare Integrated Circuit to the second generation computers. It could carry out instructions in billionths of a second. 32 CSCA0101 Computing Basics History of Computers The Third Generation Users interacted with third generation computers through keyboards and monitors and interfaced with an operating system, which allowed the device to run many different applications at one time with a central program that monitored the memory. Computers for the first time became accessible to a mass audience because they were smaller and cheaper than their predecessors. 33 CSCA0101 Computing Basics History of Computers The Fourth Generation The microprocessor brought the fourth generation of computers, as thousands of integrated circuits were built onto a single silicon chip. As these small computers became more powerful, they could be linked together to form networks, which eventually led to the development of the Internet. Microprocessor Fourth generation computers also saw the development of GUIs, the mouse and handheld devices. 34 CSCA0101 Computing Basics History of Computers The Fifth Generation Based on Artificial Intelligence (AI). Still in development. The use of parallel processing and superconductors is helping to make artificial intelligence a reality. The goal is to develop devices that respond to natural language input and are capable of learning and self-organization. There are some applications, such as voice recognition, that are being used today. 35