Effective memory address calculation

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October 15th, 2009, 04:04 PM

emerald09

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Effective memory address calculation

What is the effective address generated by each of the following instruction?

Initially BX=0x0100, label=0x0234, [label]=0x0010, and SI=0x00E1

(Offsets in part a, b and f are in decimal)

1. mov ax, [bx+40]
answer:
0x0140

2. mov ax, [bx+20]
answer:
0x0160

3. mov ax, [bx+label]
answer:
0x0394

4. mov ax, [label+bx]
answer:
0x0404

5. mov ax, [bx+si]
answer:
0x0475

6. mov ax, [si+25]
answer:
0x0106

Kindly check my answers, please point out the mistakes and tell me by an example how to do these.

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