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AGP( accelerated graphics port)
the standard analog video port on computers manufactured before 2009
software and hardware used by individuals with disabilities to interact with technology- also called assistive technology
Arithmetic Logic Unit (ALU)
the part of the processor that performs arithmetic(addition and subtraction) and logic (AND, OR, and NOT) calculations
ASCII (American Standard Code for Information Interchange)
an 8-bit binary code set with 256 characters
a code that represents digital data as a series of 0s and 1s that can be understood by a computer
a scanner that measures human characteristics such as fingerprints and eye retinas
BIOS (basic input output system)
a program stored on a chip on the motherboard that's used to start up the computer
an optical disc with about 5 times the capacity of a DVD which it was designed to replace. the single-layer disc capacity is 25 GB, and the double-layer disc is 50 GB
a type of very fast memory used to store frequently accessed information close to the processor
Central Processing Unit (CPU)
the brain of the computer; household inside the system unit on the motherboard.
-it contains two parts: arithmetic logic unit and the control unit
CMOS (complementary metal oxide semiconductor)
a volatile form of memory that uses a small battery to provide it with power to keep the data in memory even when the computer is turned off, it stores settings that are used by the BIOS
a device that serves as both an input and output device and allows you to connect to other devices on a network or to the internet.
-networks include: adapters, modems and fax devices
a legacy technology that uses a cathode ray tube to excite phosphor particles coating a glass screen to light up the pixels
the wires of the motherboard over which information flows between the components of the computer
DLP (digital light processing projector)
a projector that uses hundreds/thousands of tiny swiveling mirrors to create an image. They produce high-contrast images with deep blacks but are limited by having weaker reds and yellows
DVD (digital video disc/digital versatile disc)
an optical disc that can hold about 4.7 GB of information.
located on the motherboard, it provides a drive interface which connects disk drivers to the processor
a printer that uses heat to turn solid dye into a gas that is then transferred to special paper
EIDE (enhanced integrated drive electronics)
a legacy drive interface found on the motherboard of old-personal computers
a card that plugs directly into an expansion slot on a motherboard and allows you to connect additional peripheral devices to a computer.
-video cards, sound cards, network cards, TV tuners, and modems are common expansion cards
a hot swappable port that can connect up to 63 devices per port. it also allows for peer-to-peer communication between devices such as two video cameras without the use of a computer. also known as IEEE 1394
a small portable, solid state drive that can hold up to 128 GB of information
- they have become the standard for transporting data, also known as key drives, thumb drives, pen drives and jump drives
technology used by solid state storage devices, such as flash drives and memory cards, to store data.
- the data is stored on a chip
used to measure the speed at which a processer execute the information cycle.
- equal to one billion cycles per second
the main mass storage device in a computer. a form of nonvolatile storage; when the computer is powered off, the data isn't lost.
- the primary hard drive holds the operating system, programs, and data files
-also called hard disks or hard disk drives
an output device that converts digital signals into sounds.
- different sizes and styles, ranging from tiny earbuds to full size headphones that completely cover the outer ear.
- headphones that also include a microphone are called headsets
the most common personal printer , works by spraying droplets of ink onto the printer
the steps a CPU uses to process data: fetch, decode, execute, store.
- also known as the fetch-and-execute cycle or the machine cycle
and input device mounted on a base that consists of a stick, buttons, and sometimes a trigger.
-typically used as a game controller, or used for task as controlling robotic machinery in a factory
the most common type of printer found in schools.
- uses a laser beam to draw an image on a drum, the image is electrostatically charged and attracts a dry ink called toner, the drum is then rolled over the paper and the toner is deposited on the paper, finally the paper is heated, bonding the ink to it
LCD ( liquid crystal display)
the most common type of display found on desktop and notebook computers.
- consist of two layers of glass that are glued together with a layer of liquid crystals between them.
- when electricity is passed through the individual crystals, it causes them to pass or block light to create an image
a projector that passes light through a prism, which divides the light into three beams- red, green and blue which are then passed through an LCD screen
old technology that's still used alongside its more modern replacement, typically because it still works and is cost-effective
a form of solid-state storage used to expand the storage of digital cameras, video games
an input device that converts sounds into digital signals and is used to chat in real time or as part of voice-recognition applications used in video games and for dictating text
a communication device used to connect a computer to a telephone line, modems are most often used for dial-up internet access.
- short for modulator-demodulator
- modulates digital data into an analog-signal that can be transmitted over a phone line and one the receiving end, demodulates the analog signal back into a digital data
a video output device that works by lighting up pixels on a screen.
- each pixel contains three colors: red, green, blue(RGB) from that base all colors can be created by varying the intensities of the 3 colors
the main circuit board of a computer, it houses the CPU, drive controllers and interfaces, expansion slots, data buses, ports and connectors, BIOS, and memory and may also include integrated peripherals such as video, sounds and network cards.
- provides a way for devices to attach to a computer
an input device that allows a user to interact with objects by moving a pointer-cursor, on the computer screen.
- may include one or more buttons and a scroll wheel and works by moving across a smooth surface to signal movement of the pointer
a processor that consists of 2 or more processors on a single-chip.
- increases the processing speed over a single-core processor and reduces energy consumption over multiple separate processors
a printer device with a built in scanner, sometime fax capabilities.
- all-in-one printer
a communication device used to establish a connection with a network.
- adapter may be onboard, an expansion card or an USB device may be wired or wireless
OLED (organic light-emitting diode)
used in monitors that are composed of extremely thin panels of organic molecules between two electrodes
a form of removable storage.
- data is stored on theses discs using a laser to either melt the disc material or change the color of embedded dye
- laser can read the variations as binary data
PCI (peripheral component interconnect)
expansion slot on a motherboard that an expansion card plugs into
the components that serve the input, output, and storage functions of a computer system
designed to print high quality photos on a special photo paper.
- inkjet printers that use special ink cartridges or dye-sublimation printers, to produce lab-quality prints
The term "pixel" is actually short for "Picture Element." These small little dots are what make up the images on computer displays, whether they are flatscreen (LCD) or tube (CRT) monitors. The screen is divided up into a matrix of thousands or even millions of pixels.
uses gas plasma technology, which sandwhiches a layer of gas between two glass plates. When voltage is applied, the as releases ultraviolet (UV) light. this UV light causes the pizels on the screen to glow and form an image.
RAM (random access memory)
volatile memory that holds the operating systems, programs, and data that the computer is currently using.
- any info left in memory is lost when the power is turned off
number of horizontal pixels used by vertical pixels
- the higher the resolution the sharper the image, the measure of the number of pixels in an image, expressed in megapixels
a tag that can be read by an RFID scanner.
- contains tiny antenna for receiving and sending a radio frequency signal
an input device that can increase the speed and accuracy of data entry and convert info into a digital format that can be saved, copied and manipulated
an expansion cord that provides audio connections for input( microphones and synthesizers) and output (speakers and headphones)
a special pen like input took used by table computers, graphic design tables, PDA's, and other handheld devices
The main case of the computer unit that contains the components responsible for most of the computer's processing. The system unit typically includes the chasis, power supply, motherboard, processor, hard disk drives, optical drives, and any expansion cards.
printer that creates an image by heating specially coated heat-sensitive paper, to change color where the heat is applied
input device typically found on a notebook computer instead of a mouse, motion is detected by moving finger across the touch-sensitive surface
A coding scheme similar to ASCII that attempts to represent characters in most of the world's languages using 2bytes for each one.
- codes for more than 100, 000 characters
USB (universal serial bus)
A data path standard that theoretically allows up to 126 devices, such as keyboards, digital cameras, and scanners, to be chained together from a single port, allowing for data transmission that is much faster and more flexible than through traditional serial and parallel ports.
A computer expansion card that takes graphical data from the computer and converts it to a signal that can be transmited to a monitor over a wire or cable.
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