If a CPU has 20 address lines but MMU does'nt use two of them. OS occupie

If a CPU has 20 address lines but MMU does'nt use two of
them. OS occupies 20K. No virtual memory is supported. What
is the maximum memory available for a user program?

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If a CPU has 20 address lines but MMU does'nt use two of them. OS occupies 20K. No virtual me..

Answer / sahasra

if cpu has 20 adr lines

bt mmu supports only 18

so total memory=(2)18=2GB

or memory for use=2GB-20KB

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