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Compute the physical address for the specified operand in each of the following instructions;

 

Question:

Q2) Compute the physical address for the specified operand in each of the following instructions;

The register contnts and variable are as follows: (CS)= 0A00H, (DS)= 0B00H, (SS)= 0D00H, (SI)= 0FF0H, (DI)= 00B0H, (BP)= 00EAH, (IP)= 0000H , (BX)= 2500H, (SP)= 1800H.

 

Source operand of the instruction MOV DL, [SP+200H]

Source operand of the instruction MOV AL, [BP+SI+400H] 

Destination operand of the instruction MOV [DI+SP], AX 

Compute the physical address for the specified operand in each of the following instructions;The register contnts and variable are as follows: (CS)= 0A00H, (DS)= 0B00H, (SS)= 0D00H, (SI)= 0FF0H, (DI)= 00B0H, (BP)= 00EAH, (IP)= 0000H , (BX)= 2500H, (SP)= 1800H. Source operand of the instruction MOV DL, [SP+200H]Source operand of the instruction MOV AL, [BP+SI+400H] Destination operand of the instruction MOV [DI+SP], AX 

1. Answer

Source operand of the instruction MOV DL, [SP+200H]

MOV DL, [SP+200H]

Source address = 1800H + 200H

                         =     1A00H 

 

 

Source operand of the instruction MOV AL, [BP+SI+400H] 

MOV AL, [BP+SI+400H] 

Source address = 00EAH + 0FF0H + 400H

                         = 14DAH

Answer

Destination operand of the instruction MOV [DI+SP], AX 

MOV [DI+SP], AX 

Destination address = 00B0H + 1800H

                               = 18B0H

         

 

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