Answer to Question #160663 in Assembler for kawser

Question

Suppose, DS= 1000 H, BX= 1200 H, DI= 20 H, Oxyzen= 20H. Then, calculate the physical address of the source for the following instruction in real mode:

MOV DX, Oxyzen[BX+ DI].

Answer 1

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

Physical Address = DS*10h + disp = 1000h*10h + disp

disp = Oxyzen + BX + DI = 0020h + 1200h + 0020h

 

Physical Address = 10000h + 0020h + 1200h + 0020h = 11240h

Answer: 11240h