Answer to Question #283581 in Assembler for nancy

Question

in segment 2b43 we have the instruction MOV AL, [0104]. identify physical and logical address.

Answer 1

The basic difference between Logical and physical address is that Logical address is generated by CPU in perspective of a program whereas the physical address is a location that exists in the memory unit.

The hardware device called Memory-Management Unit is used for mapping logical address to its corresponding physical address.

logical address:    0104h

CPU makes a calculation of physical address by multiplying the segment register by 10h and adding

general purpose register to it.

DS = 2b43h

 

physical address:

2b43h * 10h + 0104h

2b430h +  0104h = 2b534h