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I have an exercise which is unclear to me. The exercise is about paging(operating system).

Exercise is:

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e. Translate into physical addresses the one(s) which are both legal and in memory.

f. What happens when a logical address is not legal? And when it is not in memory?


So far I have tried something this:

a and b) Page size = frame size = $2^7$

c) Numbers of frames = $2^8$

d) 9th addr. of page 0

logical address = (128*0)+9 = 9 it is in mem and valid

physical mem = (128*4)+9 = 521 it is in mem and valid


13th address of page 1
logical = 128*1 + 13 = 141 which is valid but not in mem
phsical mem = 128*

I am having the issue to calculate the logical address and physical address. How should these be calculated?

I don't know how to calculate point d, e and f.

Please, someone, help me.

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