Generations of Computer October 30, 2009

Sixth generation

This generation saw a move towards PC-like architectures in gaming consoles, as well as a shift towards using DVDs for game media. This brought games that were both longer and more visually appealing. Furthermore, this generation also saw experimentation with online console gaming and implementing both flash and hard drive storage for game data.

• Sega’s Dreamcast released in North America on September 9, 1999 was the company’s last video game console, and was the first of the generation’s consoles to be discontinued. Sega implemented a special type of optical media called the GD-ROM. These discs were created in order to prevent software piracy, which had been more easily done with consoles of the previous generation; however, this format was soon cracked as well. It was discontinued in 2001, and Sega transitioned to software developing/publishing only. It also sported a 33.6Kb modem which could be used to access the internet or play some of the games, like Phantasy Star Online, online.
• Sony’s PlayStation 2 was released in North America on October 26, 2000 as the follow-up to its highly successful PlayStation, and was also the first home game console to be able to play DVDs. As was done with the original PlayStation in 2000, Sony redesigned the console in 2004 into a smaller version. As of July 2008, 140 million PlayStation 2 units have been sold.^[7][8] This makes it the best selling console of all time to date.
• The Nintendo GameCube was Nintendo’s fourth home video game console and the first console by the company to use optical media instead of cartridges. The Nintendo GameCube did not play standard 12 cm DVDs, instead employing smaller 8 cm optical discs.
• Microsoft’s Xbox was the company’s first video game console. The first console to employ a hard drive right out of the box to save games, and had similar hardware specifications to a low-end desktop computer at the time of its release. Though criticized for its bulky size, which was easily twice that of the competition, as well as for the awkwardness of the original controller that shipped with it, it eventually gained popularity due in part to the success of the Halo franchise.

Generations of Computer October 30, 2009

Source–http://www.webopedia.com/didyouknow/Hardware_Software/2002/FiveGenerations.asp

The Five Generations of Computers
Last updated: August 28, 2009

The history of computer development is often referred to in reference to the different generations of computing devices. Each generation of computer is characterized by a major technological development that fundamentally changed the way computers operate, resulting in increasingly smaller, cheaper, more powerful and more efficient and reliable devices. Read about each generation and the developments that led to the current devices that we use today. First Generation (1940-1956) Vacuum Tubes 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. 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. The UNIVAC and ENIAC computers are examples of first-generation computing devices. The UNIVAC was the first commercial computer delivered to a business client, the U.S. Census Bureau in 1951. Second Generation (1956-1963) Transistors Transistors replaced vacuum tubes and ushered in the second generation of computers. The transistor was invented in 1947 but did not see widespread use in computers until the late 1950s. The transistor was far superior to the vacuum tube, allowing computers to become smaller, faster, cheaper, more energy-efficient and more reliable than their first-generation predecessors. Though the transistor still generated a great deal of heat that subjected the computer to damage, it was a vast improvement over the vacuum tube. Second-generation computers still relied on punched cards for input and printouts for output. Second-generation computers moved from cryptic binary machine language to symbolic, or assembly, languages, which allowed programmers to specify instructions in words. High-level programming languages were also being developed at this time, such as early versions of COBOL and FORTRAN. These were also the first computers that stored their instructions in their memory, which moved from a magnetic drum to magnetic core technology. The first computers of this generation were developed for the atomic energy industry. Third Generation (1964-1971) Integrated Circuits 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. Instead of punched cards and printouts, 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. Fourth Generation (1971-Present) Microprocessors The microprocessor brought the fourth generation of computers, as thousands of integrated circuits were built onto a single silicon chip. What in the first generation filled an entire room could now fit in the palm of the hand. The Intel 4004 chip, developed in 1971, located all the components of the computer—from the central processing unit and memory to input/output controls—on a single chip. In 1981 IBM introduced its first computer for the home user, and in 1984 Apple introduced the Macintosh. Microprocessors also moved out of the realm of desktop computers and into many areas of life as more and more everyday products began to use microprocessors. As these small computers became more powerful, they could be linked together to form networks, which eventually led to the development of the Internet. Fourth generation computers also saw the development of GUIs, the mouse and handheld devices. Fifth Generation (Present and Beyond) Artificial Intelligence Fifth generation computing devices, based on artificial intelligence, are still in development, though there are some applications, such as voice recognition, that are being used today. The use of parallel processing and superconductors is helping to make artificial intelligence a reality. Quantum computation and molecular and nanotechnology will radically change the face of computers in years to come. The goal of fifth-generation computing is to develop devices that respond to natural language input and are capable of learning and self-organization. DID YOU KNOW… An integrated circuit (IC) is a small electronic device made out of a semiconductor material. The first integrated circuit was developed in the 1950s by Jack Kilby of Texas Instruments and Robert Noyce of Fairchild Semiconductor.

Third generation October 30, 2009

Third generation

The mass increase in the use of computers accelerated with ‘Third Generation’ computers. These generally relied on Jack St. Clair Kilby‘s invention of the integrated circuit (or microchip), starting around 1965. However, the IBM System/360 used hybrid circuits, which were solid-state devices interconnected on a substrate with discrete wires.

The first integrated circuit was produced in September 1958 but computers using them didn’t begin to appear until 1963. Some of their early uses were in embedded systems, notably used by NASA for the Apollo Guidance Computer and by the military in the LGM-30 Minuteman intercontinental ballistic missile.

By 1971, the Illiac IV supercomputer, which was the fastest computer in the world for several years, used about a quarter-million small-scale ECL logic gate integrated circuits to make up sixty-four parallel data processors.^[1]

While large ‘mainframes‘ such as the System/360 increased storage and processing capabilities, the integrated circuit also allowed the development of much smaller computers. The minicomputer was a significant innovation in the 1960s and 1970s. It brought computing power to more people, not only through more convenient physical size but also through broadening the computer vendor field. Digital Equipment Corporation became the number two computer company behind IBM with their popular PDP and VAX computer systems. Smaller, affordable hardware also brought about the development of important new operating systems like Unix.

Large scale integration of circuits led to the development of very small processing units, an early example of this is the processor was the classified CADC used for analyzing flight data in the US Navy‘s F14A Tomcatfighter jet. This processor was developed by Steve Geller, Ray Holt and a team from AiResearch and American Microsystems.

In 1966, Hewlett-Packard entered the general purpose computer business with its HP-2116, offering a computational power formerly found only in much larger computers. It supported a wide variety of languages, among them BASIC, ALGOL, and FORTRAN.

Hybrid computers October 30, 2009

Hybrid computers are computers that exhibit features of analog computers and digital computers. The digital component normally serves as the controller and provides logical operations, while the analog component normally serves as a solver of differential equations.