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What Happens When You Press A Key

To illustrate how the computer works, let's take a very simple example. Let's suppose you are working in your word processor and you type the letter "M". Here's what happens, in general terms, when you press the " M " button: The keyboard sends an electrical signal, called a scan code, to the computer saying that a button was pressed. The keyboard controller interprets the scan code and determines that the letter pressed was an " M ". It stores this " M " in a special memory location until the processor is ready to deal with it. The controller sends a signal to the processor, called an interrupt. An interrupt tells the processor that some part of the computer has information for it to process and wants its attention. In this case, the keyboard controller wants the processor to look at the key you just pressed. The processor is almost always doing many things, sharing its time among many tasks. As a result, most every event must wait i...
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WHAT IS A FIRE WIRE PORT?

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The FireWire port is an Apple® original creation and is denoted by the Standard IEEE-1394 which preceded the USB port. Both ports (standards) were designed with the same goals. FIRE WARE SYMBOL Its original intention was for usage with devices requiring large data transfer/movement. Some of these devices were DVD players, digital audio equipment, etc. Even though IEEE-1394 is faster than USB, they share certain similarities and also differ in certain ways. Let's itemize some of these similarites and differences: Both USB and IEEE-1394 use Serial Bus Standards and twisted-pair cabling to transfer data. USB has a transfer rate of approximately 12Mb/s compared to IEEE-1394 at up to 400Mb/s. Its technology makes it better suited for use in high-end applications such as digital video where it is important to move data extremely fast. 127 dev...
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What is Subnetting?

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