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Registers R1 and R2 of a computer contains the decimal value 1100 and 500
rahuldb
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CO and Architecture
Nov 17, 2016
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Arjun
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Registers R1 and R2 of a computer contains the decimal value 1100 and 500.What is the effective address of the memory operand in each of the following instructions?
i)LOAD 20(R1),R5
ii)MOVE 300,R5
iii)STORE R5,50(R1,R2)
IV)SUBSTRACT(R1)+,R5
co-and-architecture
rahuldb
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1.. 20(R1) = Base Indexed addressing = M[ (R1) + 20] = M[ M[1100] +20] ......{ (R1) is register indirect addressing }
EA=M[1100] +20
2... 300 is the effective EA
3.. 50(R1,R2) = M[ M[1110] + M[500] +50]
EA=M[1110] + M[500] +50
4.. (R1) = M[1100]
EA=1100
Amitabh Tiwari 1
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Nov 18, 2016
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