Compute the physical address for the specified operand in each of the following instructions.The register contents and variable are as follows: (CS)=0A00H, (DS)=0B00H,

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Question:

None Q: Compute the physical address for the specified operand in each of the following instructions.The register contents and variable are as follows: (CS)=0A00H, (DS)=0B00H, (SS)=0D00H,(SI)=OFF0H, (DI)=00BOH, (BP)=00EAH and (IP)=0000H, LIST=00F0H, AX=4020H, BX=2500H.1) Destination operand of the instructionMOV LIST [BP+DI] , AX2) Source operand of the instructionMOV CL, [BX+200H]3) Destination operand of the instructionMOV [DI+6400H] , DX4) Source operand of the instructionMOV AL, [BP+SI-400H]

Step 1

Given question has asked to compute the physical address for specific operand in given instruction
The register contents and variable are as follows:
(CS)=0A00H
(DS)=0B00H
(SS)=0D00H
(SI)=0FF0H
(DI)=00B0H
(BP)=00EAH
(IP)=0000H
LIST=00F0H
AX=4020H
BX=2500H

1) MOV LIST[BP+DI],AX

2) MOV CL,[BX+200]

3) MOV AL,[BP+SI-400]

Step 2

1) MOV LIST[BP+DI],AX

This is an example of Base indexed addressing mode-

Here, destination operand physical address is calculated as base register plus an index register.

Given instruction moves data from AX to address pointed by (BP+DI) in LIST segment.

(DI)=00B0H
(BP)=00EAH

LIST=00F0H

So, physical address of destination operand, PA= LIST*10H+BP+DI
                                                                                  =0F00H+00EAH+00B0H

                                                                                   =109A

 

Step 3

2. MOV CL,[BX+200]

This is an example of Base indexed relative addressing mode-

Here, source operand physical address is calculated as base register plus an index register.

Given instruction moves data from the address pointed by (BX+200) in Data segment(DS) to CL register.

BX=2500H

(DS)=0B00H

So, physical address of source operand, PA =DS*10H+BX+200

                                                                         =B000H+2500H+200

                                                                          =B200H

 

 

 

Step 4

3.MOV[DI+6400H],DX

This is an example of Base indexed addressing mode-

Here, destination operand physical address is calculated as displacement plus an index register.

Given instruction moves data from DX to address pointed by (DI+6400H) in data segment segment.

(DI)=00B0H
(DS)=0B00H

So, physical address of destination operand, PA= DS*10H+DI+6400H

                                                                                 =0B00H*10+00B0H+6400H

                                                                                 =B000H+00B0H+6400H

                                                                                 =114B0

 

 

 

 

Step 5

4.MOV AL,[BP+SI-400]

Here, source operand physical address is calculated as base register plus an index register and subtracting displacement.

Given instruction moves data from the address pointed by (BP+SI-400) in Data segment(DS) to AL register.

(BP)=00EAH

(SI)=0FF0H

(DS)=0B00H

So, physical address of source operand, PA =DS*10H+BP+SI-400

                                                                           =B000H+00EAH+0FF0H-400

                                                                           =BCDAH