Answer to Question #150842 in Assembler for Rakibul

Question

Suppose, DS= 1015 H, BX= 1015 H, DI= 15 H, Table= 15H. Then, calculate the
physical address of the source for the following instruction in real mode:
MOV AX, Table[BX+ DI].

Answer 1

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

1015h * 10h + disp

disp = Table + BX + DI = 0015h + 1015h + 0015h

 

10150h + 0015h + 1015h + 0015h = 1118Fh

Answer: 1118Fh