edexcel igcse revision notes

5
CPU Processes intsructions RAM Stores the current running program Games console An example of computer designed specifically for doing one job QWERTY The most common type of keyboard Graphics tablet Could be used by an artist to draw directly onto the computer Scanner Reads printed data into the computer OMR Interprets pencil marks on a piece of paper normally used for multiple choice tests OCR Interprets printed or written characters into the computer

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edexcel igcse revision notes

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Page 1: Edexcel IGCSE Revision Notes

CPUProcesses intsructionsRAMStores the current running programGames consoleAn example of computer designed specifically for doing one jobQWERTYThe most common type of keyboardGraphics tabletCould be used by an artist to draw directly onto the computerScannerReads printed data into the computerOMRInterprets pencil marks on a piece of paper normally used for multiple choice testsOCRInterprets printed or written characters into the computerMICRReads data printed using a special magnetic inkSmart card

Page 2: Edexcel IGCSE Revision Notes

The same shape and size as a magnetic stripe card but stores data on a chipBiometric ScannerMakes a personal identification based on a person's unique physical characteristcsMicrophoneAn example of an input device that converts sound waves into a computer readable formVDUAnother name for a computer monitorPixelAn individual dot on a imageResolutionHow many pixels a computer monitor can displayLCDA flat screen monitor would use this technologyDotmatrixThis printer is an impact printerHard copyThe output from a printer is known as aInkjet printer

Page 3: Edexcel IGCSE Revision Notes

Sprays ink onto the paper is cheap to buy but expensive to runLaser printerUses light to make patterns of toner on a drum. This drum then transfers the ink to the paper, and finally a heating process fuses the ink to the paperThermal printerAn example of a photo printerBufferUsed on a printer to store the next print jobSpoolingA queue of documents that are waiting to be sent to the printerDPIA measure of print qualityEmbedded ComputerA tiny computer placed into a product and designed to perform specific tasks or functions for that product.Tracker ballAn alternate input device for a mouse used to select commands from a graphical user interface for people with restricted arm movements.

Page 4: Edexcel IGCSE Revision Notes

Flatbed scannerAn input device that scans flat objects one at a time.barcodeA machine-readable code that represents data as a set of bars.Digital cameraA camera that images rather than recording on film. Once a picture has been taken, it can be downloaded to a computer and then manipulated and printed.WebcamA camera that broadcast images through the Internet through a computer or web cell phone.Speech recongnitionallows you to interact with your systems using voice commandsGraphics cardAn interface card installed in the computer to control visual output on a monitor.Actuatora mechanism that puts something into automatic actionMIDI

Page 5: Edexcel IGCSE Revision Notes

Format for creating and/or playing music with instruments using synthesizers and sound cards.