0
It happens when the number is greater than the length (when it is not within the range) . so for example: Consider the following segment table:
Segment: Base: Length:
0 219 600
1 2300 14
2 90 100
3 1327 580
4 1952 96
What are the physical addresses for the following logical addresses?
a. 0, 612
b. 1, 12
c. 2, 100
d. 3, 200
e. 4, 98
Answer:
a. illegal reference, trap to operating system
b. 2300+12=2312
c. 90+100=190
d. 1327+200=1527
e. illegal reference, trap to operating system
a. is illegal because the Base (the start) is 219 and the Length (the finish) is 600, if you add the base and the length you get 819. if you add the logical address which is 612 to the base which 219 you get 831 which greater than 819. that is when we get illegal reference. Same apply to e.
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