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Category > Computer Science Posted 10 May 2017 My Price 4.00

Consider the above scheme for outputting data

For programmed I/O, Figure 7.5 indicates that the processor is stuck in a wait loop doing status checking of an I/O device. To increase efficiency, the I/O software could be written so that the processor periodically checks the status of the device. If the device is not ready, the processor can jump to other tasks. After some timed interval, the processor comes back to check status again.

a. Consider the above scheme for outputting data one character at a time to a printer that operates at 10 characters per second (cps). What will happen if its status is scanned every 200 ms?

b. Next consider a keyboard with a single character buffer. On average, characters are entered at a rate of 10 cps. However, the time interval between two consecutive key depressions can be as short as 60 ms.  At what frequency should the keyboard be scanned by the I/O program?

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Alpha Geek
(8)
Status NEW Posted 10 May 2017 02:05 PM My Price 4.00

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file 1494427338-Answer.docx preview (242 words )
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