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Buffers and Interrupts: Presentation

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Alastair Adams

on 1 December 2010

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Transcript of Buffers and Interrupts: Presentation

Buffers and Interrupts Buffers Alastair and Dennis Sometimes, data needs to be transferred between primary and secondary storage
There is, inevitably, a big difference between primary and secondary speeds
This problem is overcome by using a buffer
A buffer is a part of the memory, used to hold data temporarily whilst it is moved from one place to another Traditionally, our concept of buffering is waiting for a YouTube video to load up, or whilst streaming football matches live on the internet This, however, is not the only way in which buffering is used Buffers are commonly used in DSLR's, when taking bursts of many pictures at a time. In this situation, a buffer would be used to hold the pictures whilst they are written to the memory card Interrupts One major problem with buffers is that somtimes more data needs to be transferred than the buffer can physically hold This means that the buffer needs to be used multiple times. The processor needs to know when to send more data to the buffer, and when to stop sending it This process will ensure that the buffer can always handle the amount of data This process is known as an interrupt Interrupts are often used for things like error messages Here is how a buffer is used in a printer: So what is a buffer? What is an interrupt? Does Mr Timmins own Gears of War 2? Some questions... BONUS QUESTION: www.youtube.com/watch?v=32UGD0fV45g
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