Suppose that a 64MB system memory is built from 64 1MB RAM chips. How many address lines are needed to select one of the memory chips

6 address lines

Explanation:

The computation of the number of address lines needed is shown below:

Given that

Total memory = 64MB

=

=

Also we know that in 1MB RAM the number of chips is 6

So, the number of address lines is i..e 26 address lines

And, the size of one chip is equivalent to 1 MB i.e.

For a single 1MB chips of RAM, the number of address lines is

Therefore 6 address lines needed

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the answer is d underlined.