Answered Essay: Register is 7 and Add. field is 12, Then what is the Operand value? If Indirection field is 0 and Index Re

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Consider the following Introduction. If addressing method is Pre-Indexed Indirect and index-Register is 2 and add. field is 10, what is the Operand value? If addressing method is Pre-Indexed Indirect and index-Register is 4 and add. field is 11, what is the Operand value? If Indirection field is 0 and Index Register is 7 and Add. field is 12, Then what is the Operand value? If Indirection field is 0 and Index Register is 0 and Add. field is 18, Then what is the Operand value?

Expert Answer

 

First let us understand Pre-indexed indirect addressing mode .

In this addressing mode , indexing is done first and then the indirection.

Which means following steps are followed :

1. address field (given in question,suppose X) is added to the index register (a1) value which gives an address (a2).

2. The value at that address (a2) becomes the effective address i.e. EA=M[X+R(a1)]=M[a2]

3. The operand is the value at resulting address i.e. Operand = M[EA]

Now, let us solve the questions :

Q1. Address Field =10 (X)

Index Register(A1)=2

Addressing Mode = Pre-indexed indirect

EA =M[X+R(2)]

EA =M[10+1]=M[11]

EA= 13

Operand=M[EA]

=M[13]

=9 Ans

Q2. Address Field =11 (X)

Index Register(A1)=4

Addressing Mode = Pre-indexed indirect

EA =M[X+R(4)]

EA =M[11+2]=M[13]

EA= 9

Operand=M[EA]

=M[9]

=1 Ans

Q3. Here , the indirection field is 0 which means that it is not indirect addressing

 

Address Field = 12

Index Register(A1) =7

Addressing Mode : Indexed

EA=12+R(7) (Here , the formula has changed as indirection flag is 0)

=12+4

=16

Operand=M[16]

22 Ans

Q4. Here also indirection field is 0 which means it is not indirect addressing.

Also, the Index register is 0 which means it is not indexed.

Address Field = 18

Index Register(A1) =0

Addressing Mode : Direct Addressing

EA=18 (Here , the formula has changed as indirection flag is 0 and index register is 0)

 

Operand=M[18]

13 Ans

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