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dimulka [17.4K]
3 years ago
10

The internet and the world wide web are the same thing a. True b. False

Computers and Technology
1 answer:
wariber [46]3 years ago
4 0
Well its really both in a way but the answer is A) True 
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Why I/O modules is needed between system bus<br>and I/O devices?​
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1. Processor communication -- this involves the following tasks:

<em>a. exchange of data between processor and I/O module</em>

<em>b. command decoding - I/O module accepts commands sent from the processor. E.g., the I/O module for a disk drive may accept the following commands from the processor: READ SECTOR, WRITE SECTOR, SEEK track, etc. </em>

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<em>d. Address recognition – Each I/O device has a unique address and the I/O module must recognize this address. </em>

<em />

2. Device communication – The I/O module must be able to perform device communication such as status reporting.

3. Control & timing – The I/O module must be able to co-ordinate the flow of data between the internal resources (such as processor, memory) and external devices.

4. Data buffering – This is necessary as there is a speed mismatch between speed of data transfer between processor and memory and external devices. Data coming from the main memory are sent to an I/O module in a rapid burst. The data is buffered in the I/O module and then sent to the peripheral device at its rate.

5. Error detection – The I/O module must also be able to detect errors and report them to the processor. These errors may be mechanical errors (such as paper jam in a printer), or changes in the bit pattern of transmitted data. A common way of detecting such errors is by using parity bits.

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