Chevrolet Nova

Finally, as NOVA is a brand of gasoline sold in Mexico, the largest of all Spanish-speaking Latin American countries, it is clear that this urban legend, while perhaps entertaining, is utterly baseless. There are two major professional societies dedicated to computers, the Association for Computing Machinery and IEEE Computer Society. [1] The word nova exists in Spanish with the same meaning as in English. Terminology for different professional disciplines is still somewhat fluid and new fields emerge from time to time: however, some of the major groupings are as follows:. In reality, the Spanish no va and nova are as different as the English no table and notable. However, certain professional and academic disciplines have evolved that specialize in techniques to construct, program, and use computers. A popular urban legend asserts that the Nova sold poorly in Latin America because the phrase no va means "no go" in Spanish. In the developed world, virtually every profession makes use of computers.

In fact, a majority were fitted with inline sixes coupled to a ZF manual transmission. A very large proportion of personal computers regularly connect to the Internet to communicate and receive information. prior to the introduction of the 1994 Impala SS. In fact, the number of computers that are networked is growing phenomenally. Their SS counterparts were both coupes and 4-door sedans, the latter of which was unheard of in the U.S. Initially these facilities were available primarily to people working in high-tech environments, but in the 1990s the spread of applications like e-mail and the World Wide Web, combined with the development of cheap, fast networking technologies like Ethernet and ADSL saw computer networking become ubiquitous almost everywhere. 1962-67) body styles were sold as the Chevrolet 400; the second-generation body style was produced until 1974. Computer operating systems and applications were modified to include the ability to define and access the resources of other computers on the network, such as peripheral devices, stored information, and the like, as extensions of the resources of an individual computer.

The first- and second-generation (U.S. In the phrase of John Gage and Bill Joy (of Sun Microsystems), "the network is the computer". The early third-generation (1968 body style) Nova was marketed in Argentina as the Chevrolet Chevy from late 1969 through 1978. The emergence of networking involved a redefinition of the nature and boundaries of the computer. 1988 was the last year for the Nova nameplate on this (or any) platform, which arrived in showrooms as the Geo Prizm the following year. In time, the network spread beyond academic and military institutions and became known as the Internet. In 1985 the Nova name was applied to a rebadged Toyota Sprinter, an upmarket version of the Toyota Corolla that replaced the Citation and was produced at the NUMMI plant in Fremont, California, as an historic first joint venture between General Motors and Toyota. The technologies that made the Arpanet possible spread and evolved.

Upon introduction of the downsized GM A-body (later G-body) intermediates in 1978, the X-body and downsized A-platform were similar in dimensions, and the more modern downsized A-bodies outsold their X-body counterparts. This effort was funded by ARPA, and the computer network that it produced was called the ARPANET. From 1980 onwards, the Nova's original niche in the Chevrolet lineup was filled by front wheel drive compacts including the Citation (1980-1985), and Corsica (1987-1996). In the 1970s, computer engineers at research institutions throughout the US began to link their computers together using telecommunications technology. Production ended on December 22, 1978. However, progress on creating a computer that exhibits "general" intelligence comparable to a human has been extremely slow. The front end was revised with square headlights and a new grille for the short run. Over the years, methods have been developed to allow computers to do things previously regarded as the exclusive domain of humans — for instance, "read" handwriting, play chess, or perform symbolic integration.

The Nova's final model year, 1979, saw few changes. Robotics, indeed, is the physical expressions of the field of artificial intelligence, a discipline whose exact boundaries are fuzzy but to some degree involves attempting to give computers capabilities that they do not currently possess but humans do. Most were initially purchased by the Los Angeles County Sheriff's Department in 1976. Industrial robots have become commonplace in mass production, but general-purpose human-like robots have not lived up to the promise of their fictional counterparts and remain either toys or research projects. A high-performance police version of the Nova was introduced for the 1975 model year, making it the first compact car certified for police duty in the U.S. Perhaps the most famous computer-controlled mechanical devices are robots, machines with more-or-less human appearance and some subset of their capabilities. The Nova's X-body was stretched by several inches and fitted with an Oldsmobile fuel-injected V8 to become the Seville for 1975. Today, it is almost rarer to find a powered mechanical device not controlled by a computer than to find one that is at least partly so.

Even Cadillac got into the act. Computers have been used to control mechanical devices since they became small and cheap enough to do so; indeed, a major spur for integrated circuit technology was building a computer small enough to guide the Apollo missions and the Minuteman missile, two of the first major applications for embedded computers. The Nova SS continued for 1975 and 1976; when the SS was discontinued, the option code for the SS -- RPO Z26 -- continued as the Nova Rally until 1979. They have also been used for entertainment, with the video game becoming a huge industry. This led to civil action against GM. Sound, still pictures, and video are now routinely created (through synthesizers, computer graphics and computer animation), and near-universally edited by computer. Base V8 motors included a Chevrolet 262 (and 305) and Oldsmobile 260; Pontiac Venturas were not fitted with a Pontiac V8 from the factory after 1975, when Oldsmobile 260s and Buick 350s were installed as optional equipment. As computers have become less expensive, they have been used extensively in the creative arts as well.

During the 1977 model year for the Ventura, the GM Iron Duke was the base motor (in response to the Arab Oil Embargo) coupled to a Borg-Warner T-50 transmission (it has no relationship to the T5 found in third-generation GM F-bodies); this is a rare find these days although the motor differed from the six-cylinder based 153 last offered as an option in 1970.) The Ventura was replaced by the Phoenix in the middle of the 1977 model year. In the 1980s, personal computers became popular for many tasks, including book-keeping, writing and printing documents, calculating forecasts and other repetitive mathematical tasks involving spreadsheets. BOP versions of the Nova had either a Chevrolet inline six or Buick V6 as the base powerplant. Moreover, with the invention of the microprocessor in the 1970s, it became possible to produce inexpensive computers. The Apollo was replaced by the sportier Buick Skylark after 1975 (during the 1975 model year, the Apollo nameplate was used for the 4-door sedan, while the coupe was badged as the Skylark), while Pontiac's Ventura became a more luxurious Phoenix during 1978 (the Phoenix was the first X-body fitted with square headlights). Continual reductions in the cost and size of computers saw them adopted by ever-smaller organizations. The LN was replaced with the Nova Concours (1976 and 1977; 1977s had a 3-taillight lens scheme much similar to the Impala with a Cadillac-esque front clip.). in the United Kingdom, was operational and being used for inventory management and other purposes 3 years before IBM built their first commercial stored-program computer.

The Nova lineup ranged from the stripped-down "S" model, base, Custom (1975 and 1978/1979, which in later years became the LN and Nova Concours replacement), and the luxury-themed LN (the LN was the first to sport metric displacement badges -- either "4.3 LITRE" or "5.7 LITRE"). Lyons and Co. The front suspension and subframe assembly was similar to the one used in the second-generation GM F-body (Camaro, Firebird), whereas the rear axle and suspension were carried over from the 1968-74 generation. The LEO, a stored program-computer built by J. Six-cylinder and V8 engines remained the norm through the end of the decade (and the end of the X-body platform.) Rival Chrysler introduced their Plymouth Volare/Dodge Aspen as a competitor to GM's X-body compacts; the GM X-cars outsold their Chrysler counterparts. From the beginning, stored program computers were applied to business problems. (For the Pontiac Ventura, the side vents were horizontal.). Despite this early focus of scientific and military engineering applications, computers were quickly used in other areas.

Base coupes including the hatchback had fixed side windows (or the optioned swing-out windows similar to extended-cab pickup trucks) and vertical side vents. Others were used in cryptanalysis, for example the first programmable (though not general-purpose) digital electronic computer, Colossus, built in 1943 during World War II. A facelifted Nova was introduced in 1975 and continued through 1979. (Many of the most powerful supercomputers available today are also used for nuclear weapons simulations.) The CSIR Mk I, the first Australian stored-program computer, evaluated rainfall patterns for the catchment area of the Snowy Mountains Scheme, a large hydroelectric generation project. This was the final GTO until 2003, when rebadged Holden Monaro coupes were imported from Australia by Pontiac as the 2004 GTO. This calculation, performed in December, 1945 through January, 1946 and involving over a million punch cards of data, showed the design then under consideration would fail. Pontiac's final GTO of this era was based on a facelifted 1974 Ventura coupe fitted with a shaker hoodscoop from the Trans Am. The ENIAC was originally designed to calculate ballistics-firing tables for artillery, but it was also used to calculate neutron cross-sectional densities to help in the design of the hydrogen bomb.

Buick and Oldsmobile entered the compact car market; both the Apollo and Omega debuted, using the same bodystyles from the Nova lineup. The first digital computers, with their large size and cost, mainly performed scientific calculations, often to support military objectives. A luxury-themed Nova Custom became part of the model lineup. Instead, the custom programs written for their task perform all necessary functions that would be performed by an operating system in less specialized roles. Nova SS models offered a higher-performance 350 in³ (5.7 L) V8. Embedded computers may have a specialized operating system, or sometimes none at all. By this time, six-cylinder and V8 engines were de rigeur for American compact cars, with the 307 and 350 in³ (5.0 and 5.7 L) V8s becoming fairly common. Not all operating systems provide all of the above functions; operating systems for smaller computers typically provide fewer, such as the highly minimal operating systems for early microcomputers.

The 1973 model year introduced a hatchback bodystyle based on the 2-door coupe. For instance, Apple's Mac OS X ships with a digital video editor application. 1973. Outside these "core" functions, operating systems are usually shipped with an array of other tools, some of which may have little connection with these original core functions but have been found useful by enough customers for a provider to include them. Interestingly, the intials of the four model names spelled out the acronym NOVA (Nova, Omega, Ventura, Apollo.). While there are few technical reasons why a GUI has to be tied to the rest of an operating system, it allows the operating system vendor to encourage all the software for their operating system to have a similar looking and acting interface. After 1971, other GM divisions began rebadging the Nova as their new entry-level vehicle, such as the Pontiac Ventura II (once a trim option for full-sized Pontiacs to 1970), Oldsmobile Omega (1973) and the Buick Apollo (mid-1973). Perhaps the last major addition to the operating system were tools to provide programs with a standardized graphical user interface.

1971 Novas were similar to the previous year but with the loss of the simulated fender vents and the discontinuation of the 396 motor for the SS with the 350 taking its place. Security access controls, allowing computer users access only to files, directories and programs they had permissions to use, were also common. 1971. The range of devices that operating systems had to manage also expanded; a notable one was hard disks; the idea of individual "files" and a hierarchical structure of "directories" (now often called folders) greatly simplified the use of these devices for permanent storage. A beater coupe is seen in the movie Beverly Hills Cop. Such a development required the operating system to provide each user's programs with a "virtual machine" such that one user's program could not interfere with another's (by accident or design). Approximately 177 COPO Novas were ordered, with 175 converted by Yenko Chevrolet (the other two were sold in Canada.). The next major development in operating systems was timesharing — the idea that multiple users could use the machine "simultaneously" by keeping all of their programs in memory, executing each user's program for a short time so as to provide the illusion that each user had their own computer.

The car took the simpler "Chevrolet Nova" name this year. The combination of managing "hardware" and scheduling jobs became known as the "operating system"; the classic example of this type of early operating system was OS/360 by IBM. Final year for the SS396. Soon, special software to automate the scheduling and execution of these many jobs became available. Basically a carryover from 1969; the side markers and taillight lenses were wider. By the 1960s, with computers in wide industrial use for many purposes, it became common for them to be used for many different jobs within an organization. 1970. A particularly common task set related to handling the gritty details of "talking" to the various I/O devices, so libraries for these were quickly developed.

Like other 1969 GM vehicles, locking steering columns were incorporated, along with simulated fender vents underneath the Nova script, which was relocated to the front fender instead of the quarter panel. For the purposes of efficiency, standard versions of these were collected in libraries and made available to all who required them. The Chevy II nameplate was retired, and all models took the name "Chevy Nova". Soon after the development of the computer, it was discovered that certain tasks were required in many different programs; an early example was computing some of the standard mathematical functions. 1969. Nevertheless, the process of developing software remains slow, unpredictable, and error-prone; the discipline of software engineering has attempted, with some partial success, to make the process quicker and more productive and improve the quality of the end product.
The 153 four-cylinder option was offered between 1968-70, then was dropped due to lack of interest. The management of this enormous complexity is key to making such projects possible; programming languages, and programming practices, enable the task to be divided into smaller and smaller subtasks until they come within the capabilities of a single programmer in a reasonable period.

1968 was the final year that the Chevy II nameplate was used, although all 1968 models were "Chevy II Novas.". A typical example is the Firefox web browser, created from roughly 2 million lines of computer code in the C++ programming language; there are many projects of even bigger scope, built by large teams of programmers. Although the front subframe design was a Chevy II-exclusive design, the Camaro introduced a year earlier was the first to incorporate such a design; the redesigned Chevy II was pushed a year back to 1968 instead of 1967. Going from the extremely simple capabilities of a single machine language instruction to the myriad capabilities of application programs means that many computer programs are extremely large and complex. One notable change was the front subframe assembly -- as compared with Ford, Chrysler and AMC, in whose cars the entire front suspension was integrated with the bodyshell, a separate subframe housing the powertrain and front suspension (similar to GM fullsized vehicles) replaced the earlier style. The stereotypical modern example of an application is perhaps the office suite, a set of interrelated programs for performing common office tasks. This body style continued (with minor revisions) through 1974. A computer application is a piece of computer software provided to many computer users, often in a retail environment.

An extensive restyle came in 1968, when the station wagon and two door hardtop were discontinued. For instance, a video game includes not only the program itself, but also data representing the pictures, sounds, and other material needed to create the virtual environment of the game. 1968. Computer software is an alternative term for computer programs; it is a more inclusive phrase and includes all the ancillary material accompanying the program needed to do useful tasks. Engine options still included the basic inline four- and six-cylinder engines but now included the 283 and 327 in³ (4.6 and 5.4 L) V8 engines as well. The language chosen for a particular task depends on the nature of the task, the skill set of the programmers, tool availability and, often, the requirements of the customers (for instance, projects for the US military were often required to be in the Ada programming language). In general, proportions were squared up but dimensions and features changed little. Some programming languages map very closely to the machine language, such as Assembly Language (low level languages); at the other end, languages like Prolog are based on abstract principles far removed from the details of the machine's actual operation (high level languages).

1966 Novas saw a significant restyling, based in part on the Super Nova concept car. Instead, programmers describe the desired actions in a "high level" programming language which is then translated into the machine language automatically by special computer programs (interpreters and compilers). In 1962 and 1963 the Nova was available in a convertible body style, and a two-door hardtop was added for 1963-65. Such programming is incredibly tedious and highly error-prone, making programmers very unproductive. As mentioned above, Novas could not "officially" have V8 engines at this time -- the standard SS engine was the six-cylinder -- but many ended up with a small-block V8 under the hood. In practice, people do not normally write the instructions for computers directly in machine language. For 1963, the Chevy II Nova Super Sport was released. Rather, they do millions of simple instructions arranged by people known as programmers.

The combination of readily available V8 power and light weight made the Nova a popular choice of drag racers. Computers do not gain their extraordinary capabilities through the ability to execute complex instructions. It wasn't long before Chevrolet V8s were offered as dealer-installed options (between 1962 and 1963), up to and including the fuel-injected version available in the Corvette. A typical modern PC (in the year 2005) can execute around 3 billion instructions per second. Although the Nova was not originally available with a V8 option, the engine bay was perfectly proportioned for one. Many computer programs contain millions of instructions, and many of those instructions are executed repeatedly. Rival manufacturer Chrysler introduced the Slant Six in their Plymouth Valiant, a Chevy II competitor. These can range from just a few instructions which perform a simple task, to a much more complex instruction list which may also include tables of data.

The six was actually the third-generation powerplant, replacing the second-generation Stovebolt. Computer programs are simply lists of instructions for the computer to execute. Available powerplants included a four-cylinder and an inline six. This easy portability of existing software creates a great incentive to stick with existing designs, only switching for the most compelling of reasons, and has gradually narrowed the number of distinct instruction set architectures in the marketplace. . To slightly oversimplify, if two computers have CPUs that respond to the same set of instructions identically, software from one can run on the other without modification. Intended as a low-cost alternative to Chevrolet's rear-engined Corvair and as competition for the Ford Falcon, the Nova ended up outlasting both. The particular instruction set that a specific computer supports is known as that computer's machine language.

The original Chevy II was of unibody construction, powered by an OHV inline four or six-cylinder engine, and available in two-door and four-door sedan configurations as well as convertible and station wagon versions. For example, the code for one kind of "copy" operation in the Intel line of microprocessors is 10110000. The Chevrolet Nova or Chevy II was an American compact car introduced by the Chevrolet division of General Motors in 1962. Instructions are represented within the computer as binary code — a base two system of counting. Pontiac Ventura Page. All computer instructions fall into one of four categories: 1) moving data from one location to another; 2) executing arithmetic and logical processes on data; 3) testing the condition of data; and 4) altering the sequence of operations. Chevy Nova at Muscle Car Facts — A year-by-year account of the Nova's history from 1962–1976. Typical sorts of instructions supported by most computers are "copy the contents of memory cell 5 and place the copy in cell 10", "add the contents of cell 7 to the contents of cell 13 and place the result in cell 20", "if the contents of cell 999 are 0, the next instruction is at cell 30".

Chevrolet Nova Internet Source — The second known Nova site on the Internet; not significantly updated since 1998. A computer responds only to a limited number of instructions, which are precisely defined, simple, and unambiguous. Nova listserv — The first and only known public mailing list dedicated to Chevrolet Novas and other X-bodies; in continuous existence since January 1998. The instructions interpreted by the control unit, and executed by the ALU, are not nearly as rich as a human language. Scott Windle's NovaResource.com. The global Internet allows millions of computers to transfer information of all types between each other. The ability to transfer data between computers has opened up a huge range of capabilities for the computer.

The first class is that of secondary storage devices, such as hard disks, CD-ROMs, key drives and the like, which represent comparatively slow, but high-capacity devices, where information can be stored for later retrieval; the second class is that of devices used to access computer networks. There are two prominent classes of I/O devices. One example is the digital camera, which can be used to input visual information. There is a huge variety of other devices for obtaining other types of input.

For the personal computer, for instance, keyboards and mice are the primary ways people directly enter information into the computer; and monitors are the primary way in which information from the computer is presented back to the user, though printers, speakers, and headphones are common, too. Over the years, a huge variety of other devices have been added. A punch card reader, or something similar, was used to enter instructions and data into the computer's memory, and some kind of printer, usually a modified teletype, was used to record the results. The first generation of computers were equipped with a fairly limited range of input devices.

These results can either be viewed directly by a user, or they can be sent to another machine, whose control has been assigned to the computer: In a robot, for instance, the controlling computer's major output device is the robot itself. I/O (short for input/output) is a general term for devices that send computers information from the outside world and that return the results of computations. The level of charge in a capacitor could be set to store information, and then measured to read the information when required. A DRAM unit is a type of integrated circuit containing huge banks of an electronic component called a capacitor which can store an electrical charge for a period of time.

Eventually, DRAM was introduced. These somewhat ungainly but effective methods were eventually replaced by magnetic memory devices, such as magnetic core memory, where electrical currents were used to introduce a permanent (but weak) magnetic field in some ferrous material, which could then be read to retrieve the data. Instead, earliest computers stored data in Williams tubes — essentially, projecting some dots on a TV screen and reading them again, or mercury delay lines where the data was stored as sound pulses traveling slowly (compared to the machine itself) along long tubes filled with mercury. However, few computer designs have used flip-flops for the bulk of their storage needs.

Tubes, transistors, and transistors on integrated circuits can be used as the "storage" component of the stored-program architecture, using a circuit design known as a flip-flop, and indeed flip-flops are used for small amounts of very high-speed storage. Furthermore, The 45nm SRAM chip announced in 2006 by Intel has more than 1 billion transistors. The first IC's contained a few tens of components; as of 2005, modern microprocessors such from AMD and Intel contain over 100 million transistors. Over the history of the integrated circuit, the number of components that can be placed on one has grown enormously.

By the 1970s, the entire ALU and control unit, the combination becoming known as a CPU, were being placed on a single "chip" called a microprocessor. In the 1960s and 1970s, the transistor itself was gradually replaced by the integrated circuit, which placed multiple transistors (and other components) and the wires connecting them on a single, solid piece of silicon. Therefore, by the 1960s they were replaced by the transistor, a new device which performed the same task as the tube but was much smaller, faster operating, reliable, used much less power, and was far cheaper. They were expensive, unreliable (particularly when used in such large quantities), took up a lot of space, and used a lot of electrical power, and, while incredibly fast compared to a mechanical switch, had limits to the speed at which they could operate.

Vacuum tubes had severe limitations for the construction of large numbers of gates. It had about 2,000 valves, some of which were "dual components", so this represented somewhere between 2 and 4,000 logic components. CSIRAC, one of the earliest stored-program computers, is probably close to the smallest practically useful design. This does require a considerable number of components.

Eventually, through combining circuits together, a complete ALU and control system can be built up. Through arrangements of logic gates, one can build digital circuits to do more complex tasks, for instance, an adder, which implements in electronics the same method — in computer terminology, an algorithm — to add two numbers together that children are taught — add one column at a time, and carry what's left over. Vacuum tubes were originally used as a signal amplifier for radio and other applications, but were used in digital electronics as a very fast switch; when electricity is provided to one of the pins, current can flow through between the other two. Others soon figured out that vacuum tubes — electronic devices, could be used instead.

Shannon's famous thesis showed how relays could be arranged to form units called logic gates, implementing simple Boolean operations. However, digital circuits allow Boolean logic and arithmetic using binary numerals to be implemented using relays — essentially, electrically controlled switches. As previously mentioned, a stored program computer could be designed entirely of mechanical components like Babbage's. The conceptual design above could be implemented using a variety of different technologies.

Supercomputers often have highly unusual architectures significantly different from the basic stored-program architecture, sometimes featuring thousands of CPUs, but such designs tend to be useful only for specialized tasks. Larger computers, such as some minicomputers, mainframe computers, servers, differ from the model above in one significant aspect; rather than one CPU they often have a number of them. This procedure repeats until a halt instruction is encountered. The instructions are executed, the results are stored, and the next instruction is fetched.

Typically, on each clock cycle, the computer fetches instructions and data from its memory. The functioning of such a computer is in principle quite straightforward. Physically, since the 1980s the ALU and control unit have been located on a single integrated circuit called a Central Processing Unit or CPU. One key component of the control system is a counter that keeps track of what the address of the current instruction is; typically, this is incremented each time an instruction is executed, unless the instruction itself indicates that the next instruction should be at some other location (allowing the computer to repeatedly execute the same instructions).

Its job is to read instructions and data from memory or the I/O devices, decode the instructions, providing the ALU with the correct inputs according to the instructions, "tell" the ALU what operation to perform on those inputs, and send the results back to the memory or to the I/O devices. The control system ties this all together. On a typical personal computer, input devices include objects like the keyboard and mouse, and output devices include computer monitors, printers and the like, but as will be discussed later a huge variety of devices can be connected to a computer and serve as I/O devices. The I/O systems are the means by which the computer receives information from the outside world, and reports its results back to that world.

The second class of ALU operations involves comparison operations, which, given two numbers, can determine if they are equal, and if not, which is of greater magnitude. It is capable of performing two classes of basic operations: arithmetic operations, the core of which is the ability to add or subtract two numbers but also encompasses operations like "multiply this number by 2" or "divide by 2" (for reasons which will become clear later), as well as some others. The ALU is in many senses the heart of the computer. In principle, any cell can be used to store either instructions or data.

This information can either be an instruction, telling the computer what to do, or data, the information which the computer is to process using the instructions that have been placed in the memory. Each cell has a numbered "address" and can store a small, fixed amount of information. Conceptually, a computer's memory can be viewed as a list of cells. These parts are interconnected by a bundle of wires (a "bus") and are usually driven by a timer or clock (although other events could drive the control circuitry).

The architecture describes a computer with four main sections: the arithmetic and logic unit (ALU), the control circuitry, the memory, and the input and output devices (collectively termed I/O). The design made the universal computer a practical reality. Presper Eckert and John William Mauchly). While the technologies used in computers have changed dramatically since the first electronic, general-purpose, computers of the 1940s, most still use the stored program architecture (sometimes called the von Neumann architecture; as the article describes the primary inventors were probably ENIAC designers J.

By the 1970s, the adoption of integrated circuit technology had enabled computers to be produced at a low enough cost to allow individuals to own a personal computer of the type familiar today. Valve-driven computer designs were in use throughout the 1950s, but were eventually replaced with transistor-based computers, which were smaller, faster, cheaper, and much more reliable, thus allowing them to be commercially produced, in the 1960s. A number of projects to develop computers based on the stored program architecture commenced in the late 1940s; the first of these to be up and running was the Small-Scale Experimental Machine, but the EDSAC was perhaps the first practical version. The team who developed ENIAC, recognizing its flaws, came up with a far more flexible and elegant design, which has become known as the stored program architecture, which is the basis from which virtually all modern computers were derived.

Notable achievements include the Atanasoff Berry Computer, a special-purpose machine that used valve-driven (vacuum tube) computation, binary numbers, and regenerative memory; the American ENIAC (1943) — which was one of the first general purpose machine, but still used the decimal system and incorporated an inflexible architecture that meant reprogramming it essentially required it to be rewired; the secret British Colossus computer (1944), which had limited programmability but demonstrated that a device using thousands of valves could be made reliable and reprogrammed electronically; and Konrad Zuse's Z machines, with the electromechanical Z3 (1941) being the first working machine featuring automatic binary arithmetic and feasible programability. Defining one point along this road as "the first computer" is exceedingly difficult. A succession of steadily more powerful and flexible computing devices were constructed in the 1930s and 1940s, gradually adding the key features of modern computers, such as the use of digital electronics (invented by Claude Shannon in 1937) and more flexible programmability. These became increasingly rare after the development of the digital computer.

During the first half of the 20th century, many scientific computing needs were met by increasingly sophisticated, special-purpose analog computers, which used a direct physical or electrical model of the problem as a basis for computation. A number of technologies that would later prove useful in computing, such as the punch card and the vacuum tube had appeared by the end of the 19th century, and large-scale automated data processing using punch cards was performed by tabulating machines designed by Hermann Hollerith. Charles Babbage was the first to conceptualize and design a fully programmable computer as early as 1837, but due to a combination of the limits of the technology of the time, limited finance, and an inability to resist tinkering with his design (a trait that would in time doom thousands of computer-related engineering projects), the device was never actually constructed in his lifetime. The end of the Middle Ages saw a reinvigoration of European mathematics and engineering, and by the early 17th century a succession of mechanical calculating devices had been constructed using clockwork technology.

An example of an early computing device was the Antikythera mechanism, an ancient Greek device for calculating the movements of planets, dating from about 87 BCE. Originally, the term "computer" referred to a person who performed numerical calculations under the direction of a mathematician, possibly with the aid of a variety of mechanical calculating devices such as the abacus onward.
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Embedded computers control machines from fighter planes to digital cameras. However, the most common form of computer in use today is the embedded computer, small computers used to control another device. Smaller computers for individual use, called personal computers, and their portable equivalent, the laptop computer, are ubiquitous information-processing and communication tools and are perhaps what most non-experts think of as "a computer". The original computers were the size of a large room, and such enormous computing facilities still exist for specialized scientific computation — supercomputers — and for the transaction processing requirements of large companies, generally called mainframes.

Computers are available in many physical forms. Modern electronic computers also have enormous speed and capacity for information processing compared to earlier designs, and they have become exponentially more powerful over the years (a phenomenon known as Moore's Law). Therefore, the same computer designs have been adapted for tasks from processing company payrolls to controlling industrial robots. According to the Church-Turing thesis, a computer with a certain minimum threshold capability is in principle capable of performing the tasks of any other computer, from those of a personal digital assistant to a supercomputer, as long as time is not a factor.

In fact, they are universal information processing machines. Computers can be extremely versatile. Before the invention of electronic computers, the term computer usually referred to a human computer, a person who performed calculations for which we would use a computer for today. These instructions usually result in data being processed, and the data may represent many types of information including numbers, text, pictures, or sound.

The calculations proceed according to a program — a list of instructions. A computer is a machine capable of undergoing complex calculations. Many disciplines have developed at the intersection of computers with other professions; one of many examples is experts in geographical information systems who apply computer technology to problems of managing geographical information. Information systems concentrates on the use and deployment of computer systems in a wider organizational (usually business) context.

Software engineering concentrates on methodologies and practices to allow the development of reliable software systems while minimizing, and reliably estimating, costs and timelines. A huge array of specialties has developed within computer science to investigate different classes of problems. It tackles questions as to whether problems can be solved at all using a computer, how efficiently they can be solved, and how to construct efficient programs to compute solutions. Computer science is an academic study of the processes related to computation, such as developing efficient algorithms to perform specific tasks.

Computer engineering is the branch of electronic engineering devoted to the physical construction of computers and their attendant components.