- Memory will also be accessible in Scaled index addressing mode using a 32-bit base & indexing register.
- The instruction's first parameter will be the base register, and the instruction's second parameter will be the index register.
- The index register is multiplied by a scaling factor before the program is fetched.
For option a:
The baseline register is [tex]\bold{BX}[/tex], while the index register is [tex]\bold{CX+5*AX}[/tex].
- The multiplier for Accumulator [tex]\bold{AX }[/tex] will be 5.
- [tex]\bold{CX }[/tex] will be multiplied with this value.
- [tex]\bold{CX+5*AX}[/tex] will contain a memory address.
- The value at position [tex]\bold{CX+5*AX}[/tex] is accessed by [tex]\bold{[{CX+5*AX} ]}[/tex].
- The value retrieved from the address [tex][\bold{CX+5*AX}][/tex] is moved into Base register BX by the MOV instruction.
For option b:
Its index register is [tex]\bold{CX }[/tex], whereas the base register is [tex]\bold{DX5*DI+30H}[/tex].
- [tex]\bold{CX}[/tex] has a number, that is copied to a computed place below.
- After multiplying [tex]\bold{DI}[/tex] by [tex]\bold{5, DX}[/tex] will be multiplied by this [tex]\bold{5*DI}[/tex].
- To the aforementioned multiplied value,[tex]\bold{ 30H}[/tex] will be added.
- [tex]\bold{[DX5*DI+30H]}[/tex] is a value located at location [tex]\bold{DX5*DI+30H}[/tex]. [tex]\bold{DX5*DI+30H }[/tex] is a memory address number.
- As a result, the value of [tex]\bold{CX}[/tex] will be copied to the [tex]\bold{ [DX5*DI+30H] }[/tex]location.
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