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Andrew S. Tanenbaum (OS) Edition 4 Exercise 1 Question 6 (Page No. 81)
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Instructions related to accessing I/O devices are typically privileged instructions, that is, they can be executed in kernel mode but not in user mode. Give a reason why these instructions are privileged.
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Andrew S. Tanenbaum (OS) Edition 4 Exercise 1 Question 11 (Page No. 81)
A $255$-GB disk has $65,536$ cylinders with $255$ sectors per track and $512$ bytes per sector. How many platters and heads does this disk have? Assuming an average cylinder seek time of $11$ ms, average rotational delay ... reading rate of $100$ MB/sec, calculate the average time it will take to read $400$ KB from one sector.
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Andrew S. Tanenbaum (OS) Edition 4 Exercise 1 Question 10 (Page No. 81)
What is the difference between kernel and user mode? Explain how having two distinct modes aids in designing an operating system.
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Andrew S. Tanenbaum (OS) Edition 4 Exercise 1 Question 9 (Page No. 81)
There are several design goals in building an operating system, for example, resource utilization, timeliness, robustness, and so on. Give an example of two design goals that may contradict one another.
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Andrew S. Tanenbaum (OS) Edition 4 Exercise 1 Question 8 (Page No. 81)
One reason GUIs were initially slow to be adopted was the cost of the hardware needed to support them. How much video RAM is needed to support a $25-\text{line}\times\: 80-\text{row}$ character monochrome text screen? How much for a ... $ prices $(\$5/KB)?$ How much is it now?
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