Input and Output Devices notes
13 notes by 12 users
This GoConqr page gathers notes on input and output devices, from scanners and touchscreens to interrupts and direct memory access. School students can revise these topics, while teachers can find material for lessons. There are over 10 notes, mostly for secondary-level study. Choose a note and start exploring.
Notes
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Direct Memory Access (DMA) The CPU can request data from an I/O controller one byte at a time, but doing so wastes the CPU's time.We assume that the CPU accesses all devices and memory via a single system bus that connects the CPU, the memory, ...
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DEVICES Explaination DEVICESIn IT for Computer Week, we had to learn about Input and Output devices.An Input Device is an object, that inputs electrical waves, into an Output or Storage Device.An Output Device is an object, that outputs t...
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Transfer of control via Interrupts From the point of view of the user program, an interrupt is just that: an interruption of the normal sequence of execution. When the interrupt processing is completed, execution resumes. Thus, the user program does no...
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CHAPTER 3 INPUT OUTPUT - created from Mind Map INPUT OUTPUT * Data or instructions entered into memory or computer
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Time Sequence of Multiple interrupts Time Sequence of Multiple interrupts As an example of this second approach, consider a system with three I/O devices: a printer, a disk, and a communications line, with increasing priorities of 2, 4, and 5, respective...
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INPUT - created from Mind Map PEN INPUT MOTION, VOICE, VIDEO INPUT touch a stylus or digital pen on a flat surface to write, draw, or make selections
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Touchscreens Infra-red How it works: Infra-red rays sent across screen from the edges Sensors around the screen Rays from grid across screen Ray is broken Calculations by microprocessor to determine where the touch was Advantages:...
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Thermal 1.200 to 2.400 dpi (dots per inch) special ink powder called toner the laser beam
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Input Devices CRT Monitors- Used to output images on a screen and shows what you have typed in.AdvantagesProduces more clearer images than a TFT monitor. Compatible with light pens so ideal for designing in conjunction with CAD and...
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page 76-77 Exam Questions1. a) Give one reason why its better to show them the webpage on a screen rather than printed out on paper. The colours will be more true to life on a screen than on a printout.b) Give one type of printe...
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Input Devices A scanner is used to take information stored on paper and read it into a computer system. Scanners can be used to convert photographs, paintings and typed text into a form that can be stored in a computer. A flatbed s...
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touch screen Touch screen- touch screen on a phone or tablet-buying train tickets at a train stationAdvantages- don't need to buy a separate keyboard-make information larger for people with visual impairmentDisadvantages- Hygiene ...
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Untitled CAPTURE METHODS:Voice recognition,keyboardmagnetic stripesBarcoding and EPOStouch sensitive screensoptical mark reading (OPR) DISADVANTAGES :slow input, have to follow lots of instructions ADVANTAGES :
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About input and output devices notes
GoConqr OriginalUsing input and output devices notes
The notes offer different starting points within the unit. Input Devices includes notes on scanners, while Touchscreens describes how infra-red rays and sensors detect a touch. There are also notes on pen, motion, voice and video input, and a resource with exam questions about screens and printouts.
Choose a route through the notes
Start with the scanner notes if you want a device-specific example, or try Touchscreens to follow how a touch is detected. For a look at how devices communicate with a computer, read Direct Memory Access (DMA) and the notes on interrupts.
After reading, summarise a process in your own words and return to the note to check it. If you want to practise recall instead, switch to a flashcard deck on the unit page; use a quiz when you want to test your understanding. Pick a topic and see which note helps you explore it.
Frequently asked questions
Which note should I start with?
Try the scanner notes titled Input Devices if you want to begin with an example of an input device. Touchscreens is another starting point: it describes how infra-red rays and sensors detect a touch. Choose the topic you want to revise first.
Do the notes cover more than individual devices?
Yes. Alongside notes on scanners and touchscreens, the page lists Direct Memory Access (DMA) and notes on interrupts. These offer a way to explore communication between devices and the computer, as well as the devices themselves.
Are these notes free to use?
Yes. Every resource listed here is free to open and study without an account. The notes were made by GoConqr users. A free account also lets you save quiz scores and make your own quizzes, mind maps, flashcards and notes.