Computer System Hardware Input Process Output Storage
Input Devices Input is any data or instructions you enter into the memory of a computer. Once input is in memory, the CPU can access it and process the input into output. Four types of input are data, programs, commands, and user responses.
Different Types of Input Devices II Keyboard II II Mouse II II Digital Camera II II Joysticks II II Scanner II II Microphone II ! Click one for more details ..
Output Devices An Output Device is a device which the computer uses to “put out” or display information whether it be visual (a printer, monitor, plotter), auditory (speakers), or even tactile (pagers or beepers which vibrate). It is possible that taste and smells may come from computers in the future.
Different Types of Output Devices II Monitor II II Printer II II Speakers II II Plotter II II Projector II II Pager II ! Click one for more details..
Storage Computer data storage , often called storage or memory , refers to computer components, devices, and recording media that retain digital data used for computing for some interval of time. Computer data storage provides one of the core functions of the modern computer, that of information retention. It is one of the fundamental components of all modern computers, and coupled with a central processing unit (CPU, a processor), implements the basic computer model used since the 1940s. II Magnetic Storage Devices II II Optical Storage Devices II II Solid-State Storage Media II “ II II “ (hyperlink)
K e y b o a r d <ul><li>is an input device , partially modeled after the typewriter keyboard , which uses an arrangement of buttons or keys , to act as mechanical levers or electronic switches. A keyboard typically has characters engraved or printed on the keys and each press of a key typically corresponds to a single written symbol . However, to produce some symbols requires pressing and holding several keys simultaneously or in sequence. While most keyboard keys produce letters , numbers or signs ( characters ), other keys or simultaneous key presses can produce actions or computer commands . </li></ul>Back to Options..
Mouse <ul><li>a mouse (plural mouses , mice , or mouse devices ) is a pointing device that functions by detecting two-dimensional motion relative to its supporting surface. Physically, a mouse consists of an object held under one of the user's hands, with one or more buttons. It sometimes features other elements, such as "wheels", which allow the user to perform various system-dependent operations, or extra buttons or features can add more control or dimensional input. The mouse's motion typically translates into the motion of a pointer on a display , which allows for fine control of a Graphical User Interface . </li></ul>Back to Options..
Digital Cameras <ul><li>A digital camera (or digicam for short) is a camera that takes video or still photographs , or both, digitally by recording images via an electronic image sensor . </li></ul><ul><li>Digital cameras can do things film cameras cannot: displaying images on a screen immediately after they are recorded, storing thousands of images on a single small memory device, recording video with sound, and deleting images to free storage space. Some can crop pictures and perform other elementary image editing . Fundamentally they operate in the same manner as film cameras , typically using a lens with a variable diaphragm to focus light onto an image pickup device. The combination of the diaphragm and a shutter mechanism is used to admit the correct amount of light to the imager, just as with film; the only difference is that the image pickup device is electronic rather than chemical. </li></ul>Back to Options..
J o y s t i c k s <ul><li>A joystick is an input device consisting of a stick that pivots on a base and reports its angle or direction to the device it is controlling. Joysticks are often used to control video games, and usually have one or more push-buttons whose state can also be read by the computer. A popular variation of the joystick used on modern video game consoles is the analog stick . </li></ul><ul><li>Joysticks are also used for controlling machines such as cranes, trucks, underwater unmanned vehicles and zero turning radius lawn mowers. Miniature finger-operated joysticks have been adopted as input devices for smaller electronic equipment such as mobile phones . </li></ul>Back to Options..
Scanner <ul><li>a scanner is a device that optically scans images, printed text, handwriting , or an object, and converts it to a digital image . Common examples found in offices are variations of the desktop (or flatbed) scanner where the document is placed on a glass window for scanning. Hand-held scanners, where the device is moved by hand, have evolved from text scanning "wands" to 3D scanners used for industrial design, reverse engineering, test and measurement, orthotics, gaming and other applications. Mechanically driven scanners that move the document are typically used for large-format documents, where a flatbed design would be impractical . </li></ul>Back to Options..
M i c r o p h o n e <ul><li>A microphone , sometimes colloquially called a mic or mike (both pronounced /maɪk/), is an acoustic-to-electric transducer or sensor that converts sound into an electrical signal . Microphones are used in many applications such as telephones , tape recorders , hearing aids , motion picture production, live and recorded audio engineering , in radio and television broadcasting and in computers for recording voice, VoIP , and for non-acoustic purposes such as ultrasonic checking. </li></ul>Back to Options..
M o n i t o r <ul><li>A monitor or display (sometimes called a visual display unit ) is a piece of electrical equipment which displays images generated by devices such as computers , without producing a permanent record. The monitor comprises the display device, circuitry , and an enclosure. The display device in modern monitors is typically a thin film transistor liquid crystal display (TFT-LCD), while older monitors use a cathode ray tube (CRT). </li></ul>Back to Options..
P r i n t e r <ul><li>a printer is a peripheral which produces a hard copy (permanent readable text and/or graphics) of documents stored in electronic form , usually on physical print media such as paper or transparencies . Many printers are primarily used as local peripherals , and are attached by a printer cable or, in most newer printers, a USB cable to a computer which serves as a document source. Some printers, commonly known as network printers, have built-in network interfaces (typically wireless and/or Ethernet), and can serve as a hardcopy device for any user on the network. Individual printers are often designed to support both local and network connected users at the same time. </li></ul>Back to Options..
Speake r s <ul><li>Computer speakers , or multimedia speakers , are external speakers , commonly equipped with a low-power internal amplifier. The standard audio connection is a 3.5mm (1/8 inch) stereo jack plug often colour-coded lime green (following the PC 99 standard) for computer sound cards . A plug and socket for a two-wire (signal and ground) coaxial cable that is widely used to connect analog audio and video components. Also called a "phono connector," rows of RCA sockets are found on the backs of stereo amplifier and numerous A/V products. The prong is 1/8" thick by 5/16" long. A few use an RCA connector for input. There are also USB speakers which are powered from the 5 volts at 200 milliamps provided by the USB port, allowing about half a watt of output power. </li></ul>Back to Options..
Plotter <ul><li>A plotter is a vector graphics printing device to print graphical plots , that connects to a computer . There are two types of main plotters. Those are pen plotters and electrostatic plotters . </li></ul><ul><li>Pen Plotter </li></ul><ul><li>Electrostatic Plotter </li></ul>Back to Options..
Projector <ul><li>A slide projector is an opto-mechanical device to view photographic slides . It has four main elements: a fan-cooled electric incandescent light bulb or other light source, a reflector and "condensing" lens to direct the light to the slide, a holder for the slide and a focusing lens . A flat piece of heat absorbing glass is often placed in the light path between the condensing lens and the slide, to avoid damaging the latter. This glass transmits visible wavelengths but absorbs infrared . Light passes through the transparent slide and lens, and the resulting image is enlarged and projected onto a perpendicular flat screen so the audience can view its reflection. Alternatively the image may be projected onto a translucent "rear projection" screen, often used for continuous automatic display for close viewing. This form of projection also avoids the audience's interrupting the light stream or bumping into the projector. </li></ul><ul><li>And a lot more different types of projector like video, movie, overhead projectors. </li></ul>Back to Options..
Pager <ul><li>A pager (sometimes called a page , beeper or bleep ) is a simple personal telecommunications device for short messages. A one-way numeric pager can only receive a message consisting of a few digits, typically a phone number that the user is then expected to call. Alphanumeric pagers are available, as well as two-way pagers that have the ability to send and receive email , numeric pages, and SMS messages. </li></ul>Back to Options..
<ul><li>Floppy Disks : small, portable disks that hold a limited amount of data. </li></ul><ul><li>Hard Disks: large-capacity and fast-access storage devices. </li></ul><ul><li>Zip Disks: auxiliary storage devices that can hold large quantities of data and can be portable. </li></ul><ul><li>Magnetic Tape Drives: used for making system backups and storing large quantities of data. </li></ul>Magnetic Storage Devices HOME
Optical Storage Devices <ul><li>CD-DA: audio-cd. </li></ul><ul><li>CD-R: this drive allows you to read and to write to a compact disk. </li></ul><ul><li>CD-ROM: can hold large amounts of data, but is read-only access. </li></ul><ul><li>CD-RW: can be written on several times. </li></ul><ul><li>DVD-ROM: read-only DVD format. </li></ul><ul><li>DVD-R: similar to CD, but holds more data; read-only. </li></ul><ul><li>DVD-RW: can be written on several times. </li></ul><ul><li>Photo-CD: used for storing digital photographs on CD. </li></ul>HOME
Solid-State Storage Media <ul><li>Non-volatile removable Media </li></ul><ul><li>Miniature mobile Media </li></ul><ul><li>- Uses integrated circuits. </li></ul><ul><li>USB flash drive </li></ul><ul><li>- Connects to the computer via a USB port. </li></ul>END
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