Take computer science courses online for free from top universities worldwide. Browse computer science MOOCS in a variety of disciplines and enroll now. This course aims to teach everyone the basics of programming computers using Python Syntax And SemanticsBasic Programming LanguageComputer. From Wikipedia, the free encyclopedia. Jump to navigation Jump to search. Instructions to be executed by a computer. For the TV program, see The Computer Programme. "hello, world" computer program by Brian Kernighan ( ). A computer program is a collection of instructions that performs a specific task when executed The names of the components of the calculating device.

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THE FUTURE OF THE BODY DIAGNOSIS BRAINPOWER REPRODUCTION THEMEDICINE CABINET STRENGTH HEALING EVOLUTION. Linux is a family of free and open-source software operating systems based on the Linux kernel 7 Copyright, trademark, and naming; 8 See also; 9 Notes; 10 References The availability of a high-level language implementation of Unix made its Developers worked to integrate GNU components with the Linux kernel. A computer is a device that can be instructed to carry out sequences of arithmetic or logical A "complete" computer including the hardware, the operating system (main software), Since ancient times, simple manual devices like the abacus aided people in .. High speed memory was limited to 20 words (about 80 bytes).

CD-RW rewritable can be written to more than once as well as read more than once. The CD writer drive can read and write a CD. Both kinds of CD drives are called optical disc drives because the use a laser light or electromagnetic waves to read or write data to or from a CD.

The main uses for DVDs are video and data storage. Most DVDs are of the same dimensions as compact discs.

Just like CDs there are many different variations. Its main uses are high-definition video and data storage. Blu-ray discs have similar devices used to read them and write to them as CDs have.

Floppy disks are read and written by a floppy disk drive. Floppy disks are a dying and being replaced by the optical and flash drives. Many new computers do not come with floppy drives anymore but there are a lot of older ones with floppy drives lying around.

While floppy disks are very cheap the amount of storage on them compared to the amount of storage for the price of flash drives makes floppy disks unreasonable to use. There are a few different types of internal storage.

Hard disks are the most popular type of internal storage. Solid-state drives have grown in popularity slowly. A disk array controller is popular when you need more storage then a single har disk can hold. Just about every new computer comes with a hard disk these days unless it comes with a new solid-state drive.

An SSD emulates a hard disk drive, thus easily replacing it in any application. SSDs are currently more expensive per unit of capacity than HDDs which is why they have not caught on so quickly. It almost always implements hardware RAID. Computer hardware is in embedded systems in automobiles, microwave ovens, CD players, DVD players, and many more devices. In , only 0. How many other things in your house or your classroom use computer hardware?

It is the central circuit board making up a complex electronic system. A motherboard provides the electrical connections by which the other components of the system communicate. The mother board includes many components such as: central processing unit CPU , random access memory RAM , firmware, and internal and external buses. It is sometimes referred to as the brain of the computer. The first step, fetch, involves retrieving an instruction from program memory.

In the decode step, the instruction is broken up into parts that have significance to other portions of the CPU. During the execute step various portions of the CPU, such as the arithmetic logic unit ALU and the floating point unit FPU are connected so they can perform the desired operation.

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The final step, writeback, simply writes back the results of the execute step to some form of memory. RAM attaches directly to the motherboard, and is used to store programs that are currently running. RAM is a set of integrated circuits that allow the stored data to be accessed in any order why it is called random.

There are many different types of RAM. Distinctions between these different types include: writable vs. It is a computer program that is embedded in a hardware device, for example a microcontroller.

As it name suggests, firmware is somewhere between hardware and software. Like software, it is a computer program which is executed by a microprocessor or a microcontroller. But it is also tightly linked to a piece of hardware, and has little meaning outside of it. Most devices attached to modern systems are special-purpose computers in their own right, running their own software. B Mouse Mouse is the most popular pointing device and cursor-control device having a small palm size box with a round ball at its base which senses the movement of mouse and sends corresponding signals to CPU when the mouse buttons are pressed.

It forms images from tiny dots, called pixels that are arranged in a rectangular form. The sharpness of the image depends upon the number of pixels. D Printer Printer is an output device, which is used to print information on paper. Impact Printers: The impact printers print the characters by striking them on the ribbon which is then pressed on the paper.

Non-Impact Printers: Non-impact printers print the characters without using ribbon. These printers print a complete page at a time so they are also called as Page Printers.

Laser Printers, Inkjet Printers. E Joy Stick It is a device used to move cursor position on a monitor screen. F Scanner A scanner allows you to scan printed material and convert it into a file format that may be used within the PC.

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G Plotter A plotter is used to create high-quality visuals on paper. A plotter gives a hard copy of the output.

It draws pictures on a paper using a pen. It can be used to create presentation-charts, graphics, tables and high quality technical drawings. There are two types of plotter.

Drum Plotter: The paper is placed over the drum that rotates back and forth.

A carriage holding one or more pens is mounted horizontally across the drum. The carriage with the pens moves horizontally over the paper.

Each pen could be filled with different colours. This plotter has the ability to produce colour pictures. Flat Bed Plotter: In flat bed plotter, the paper does not move.

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The carriage holding the pens should provide all motions. Inkjet plotters can also produce large drawings with different colours. Liked these Basic Computer Hardware Notes?Unlike conventional programs, microcode is not usually written by, or even visible to, the end users of systems, and is usually provided by the manufacturer, and is considered internal to the device.

An ALU may also compare numbers and return boolean truth values true or false depending on whether one is equal to, greater than or less than the other "is 64 greater than 65?

Grace Hopper was the first person to develop a compiler for programming language.

Master of Science in Computer Networking degree programs are also available. Get Started with Tulane University What is your highest level of education completed? Both erasing and programming take about 4 to 10 milliseconds.

Impact Printers: The impact printers print the characters by striking them on the ribbon which is then pressed on the paper. The need for computers to work well together and to be able to exchange information has spawned the need for many standards organizations, clubs and societies of both a formal and informal nature.

While popular usage of the word "computer" is synonymous with a personal electronic computer, the modern [82] definition of a computer is literally: Students enrolled in an associate's degree program in computer network engineering learn to design and maintain computer