Computers and Technology, 02.07.2021 14:00 sharkboy3780
2. Why is DMA an improvement over CPU programmed I/O?
3. When would DMA transfer be a poor choice?
4. What is the average time to read or write a 512-byte sector for a typical disk rotating at
7200 RPM? The advertised average seek time is 8ms, the transfer rate is 20MB/sec,
and the controller overhead is 2ms. Assume that the disk is idle so that there is no
waiting time.
5. Disk requests come in to the disk driver for cylinders 10, 22, 20, 2, 40, 6, and 38, in that
order. A seek takes 6 msec per cylinder moved. How much seek time is needed for
(a) First-Come, first served.
(b) Closest cylinder next.
(c) Elevator algorithm (initially moving upward).
In all cases, the arm is initially at cylinder 20.
6. Describe how keyboard software works and which problems does keyboard software
need to handle?
Answers: 2
Computers and Technology, 21.06.2019 20:40
Convert and simplify the following sentences to conjunctive normal form (cnf): (a) (p → (q → r)) → (p → (r → q)) (b) (p ∧ q) → (¬p ↔ q) (c) ((p → q) ∧ ¬q) → ¬p
Answers: 3
Computers and Technology, 22.06.2019 21:30
After you clean an engine with hot water spray, it seems to stall; when it doesn't stall, it's idling noisily. technician a says to check for loose bolts on the flex plate near the torque converter. technician b says to wipe down the spark plug wires and the distributor cap. who is correct? a. technician a b. both technicians a and b c. technician b
Answers: 1
Computers and Technology, 22.06.2019 22:30
Which of the following factors would your hypothetical supervisor look at when deciding whether to test a biological material sample for dna? the amount of other evidence you have implicating a suspect in a crime the annual budget for the crime lab both of the above none of the above; you would almost always order a test
Answers: 3
2. Why is DMA an improvement over CPU programmed I/O?
3. When would DMA transfer be a poor choice?<...
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