The Journey Of Computer

1. Introduction
2. Progressive history of computer through age
3. World War II and military use of computer
4. Post war need for a modified computer
5. First computer with RAM
6. Computer in 50s and 60s
7. Professional use of computer Modern languages

Only once in a lifetime will a new invention come about to touch aspect of our lives. Such a device that changes the way we work, live and play is a special one, indeed. A machine that has done all this and more now exists in nearly every big and medium business in Pakistan and one out of every two households. This incredible invention is the computer. The electronic computer has been around for over a half-century, but its ancestors have been around for 2000 years. However, only in the last 40 years has it changed the society. From the first wooden abacus to the latest high-speed microprocessor, the computer has changed nearly every aspect of people’s lives for the better.

The very earliest existence of the modern day computer’s ancestor is the abacus. These data back to almost 2000 years ago. It is simply a wooden rack holding parallel wires on which beads are strung. When these beads are moved along the wire according to “programming” rules that the user must memorize, all ordinary arithmetic operations can be performed. The next innovation in computers took place in 1694 when Blaise Pascal invented the first “digital calculating machine” machine”. It could only add numbers and they had to be entered by tuming dials. It was designed to help Pascal’s father who was a tax collector.

In the early 1800’s, a mathematics professor named Charles Babbage designed an automatic calculation machine. It was steam powered and could store up to 1000 50-digit numbers. Built in to his machine were operations that include everything a modern general- purpose computer would need. It was programed by-and stored data on-cards with holes punched in them, appropriately called Punch cards. His inventions were failures for the most part because of the lack of precision machining techniques used at the time and the lack of demand for such a device.

By the late 1930s punched-card machine techniques had become so well established and reliable that Howard Hathaway Aiken, in collaboration with engineers at IBM construction of a large automatic digital computer based on standard IBM electromechanical parts. Aliken’s machine, called the Harvard Mark I, handled 23-digit numbers and could perform all four arithmetic operations. Also, it had special built in-programs to handle logarithms and trigonometric functions. The mark I was controlled from prepunched paper tape. Output was by card punch and electric typewriter. It was slow, requiring 3 to 5 seconds for a multiplication but it was fully automatic and could complete long computations without human intervention.

The outbreak of World War II produced a desperate need for computing capability, especially for the military. New weapons systems were produce which needed trajectory tables and other essential data. In 1942, John W.Mauchley, and other associates at the University of Pennsylvania decided to build a high-speed electronic computer to do the job. This machine became known as ENIAC, for “Electrical Numerical Integrator and Calculator”. It could multiply two numbers at the rate of 300 products per second, by finding the value of each product from a multiplication table stored in its memory.ENIAC was thus about 1,000 times faster than previous generation of computers.

ENIAC used 18,000 standard vacuum tubes, occupied 1800 electricity. It used punched-card input and output. The ENIAC was very difficult to program because one had to essentially re-wire it to perform whatever task he wanted the computer to do. It was, however, efficient handling the particular programs for which it had been designed. ENIAC is generally accepted as the first successful high-speed electronic digital computer and was used in many applications from 1946 to 1955.

Mathematic John von Neumann was very interested in the ENIAC. In 1945 he undertook a theoretical study of computation that demonstrated that a computer could have a very simple and yet be able to execute any kind of computation effectively by means of proper programed control without the need for any changes in hardware. Von Neumann came up with incredible ideas for methods and building and organizing practical, fast computers. These ideas, which came to be referred to as the stored-program technique, became fundamental for future generations of high-speed digital computers and were universally adopted.The first wave of modern programed electronic computers to take advantage of these improvements appeared in 1947. This group included computers using random access memory (RAM) which is a memory designed to give almost constant access to a

These machines had punched-card or punched-tape input and output devices and RAMs of 100-word capacity. Physically, they were much more compact than ENIAC: some were about the size of a grand piano and required 2500 small electron tubes. This was quite an improvement over the earlier machines. The first-generation stored-program computers required considerable maintenance, usually attained 70% to 80% reliable operation, and were used for 8 to 12 years. Typically, they were programmed directly in machine language, although by the mid-1950s progress had been made in several aspects of advanced programming. This group of machines included EDVAC and UNIVAC, the first commercially available computers.

Early in the 1950s two important engineering discoveries changed the electronic computer field. The first computers were made with vacuum tubes, but by the late 1950’s computers were being made out of transistors, which were smaller, less expensive, more reliable, and more efficient. In 1959, Robert Noyce, a physicist at the Fairchild Semiconductor Corporation, invented the integrated circuit, a tiny chip of silicon that contained and entire electronic circuit. Gone was the bulky, unreliable, but fast machine; now computers began to become more compact, more reliable and have more capacity. These new technical discovers rapidly found their way into new models of digital computers. Memory storage capacities increased 80% in commercially available machines by the early 1960s and speeds increased by an equally large margin.

These machines were very expensive to purchase or rent and were especially expensive to operate because of the cost of hiring programmers to perform the complex operations the computers ran. Such computers were typically found in large computer centers-operated by industry, government and private laboratories-staffed with many programmers and support personal. By 1956, 76 of IMB’s large computer mainframes were in use, compared with only 46 UNVAC’s. In the 1960s efforts to design and develop the fastest possible computers with the greatest capacity reached a turning point with the completion of the LARC machine for Livermore Radiation Laboratories by the Sperry-Rand Corporation, and the Stretch computer by IBM.

The LARC had a core memory of 98,000 words and multiplied in 10 microseconds. Stretch was provided with several ranks of memory having slower access for the ranks of greater capacity, the fastest access time being less than 1 microseconds and the total capacity in the vicinity of 100 million words.

During this time the major computer manufactures began to offer a range of computer capabilities, as well as various computer—related equipment. These included input means such as consoles and card feeders; output means such as page printer, cathode-ray-tub displays and graphing devices; and optional magnetic-tap and magnetic –disk file storage. These found wide use in business for such applications as accounting, payroll, inventory control, ordering, supplies and billing. Central processing units (CPUSs) for such purposes did not need to be very fast arithmetically and were primarily used to access large amounts of records on file. The greatest number of computer systems was delivered for the larger applications, such as in hospitals for keeping track of patient records, medications, and treatments given. They were also used in automated library systems and in database systems such as the Chemical Abstracts system, where computer records now on file cover near all known chemical compounds (Rogers, 89).

The trend during the 1970s was, to some extent, away from extremely powerful centralized computational centers and toward a broader range of applications for less-costly computer systems. Most continuous-process manufacturing, such as petroleum refining and electrical-power distribution systems, began using computers of relatively modest capability for controlling and regulating their activities. In the 1960s the programming of applications problems was an obstacle to the self-sufficiency of moderate-sized on-site computer installations, but great advances in applications programming languages remove these obstacles.

Applications languages became available for controlling a great range of manufacturing processes, for computer operation of machine tools, and for many other tasks. In 1971 Mercian Hoff, Jr., an engineer at the Intel Corporation, invented the microprocessor and another stage in the development of the computer began. The computer had made its mark everywhere in society and built up a huge industry. The future is promising for the computer industry and is technology. The speed of processors is expected to double every year and a half in the coming years. As manufacturing techniques are further perfected the prices of computer systems are expected to steadily fall. However, since the microprocessor technology will be increasing, its higher costs will offset the drop in price of older .