Final answer:
The effective address for each instruction is calculated by adding the provided values to the register specified. These addresses are crucial for data access in assembly programming. The calculated effective addresses are 0x010C, 0x1101, 0x1101, and 0x0200 for the respective instructions.
Step-by-step explanation:
The student is asking about effective address calculation in assembly language programming. This involves computing the address in memory that will be accessed by the given instructions. This concept is crucial for understanding how data is accessed and manipulated in low-level programming. Let's examine each instruction given the initial values: BX=0x0100, num1=0x1001, [num1]=0x0000, and SI=0x0100.
- a. mov ax, [bx+12]: The effective address is computed by adding 12 to the value in the BX register. So, effective address = 0x0100 + 0x000C = 0x010C.
- b. mov ax, [bx+num1]: This instruction adds the value of num1 to the value in BX. Effective address = 0x0100 + 0x1001 = 0x1101.
- c. mov ax, [num1+bx]: As the addition is commutative, this is the same as instruction b. Effective address = 0x1001 + 0x0100 = 0x1101.
- d. mov ax, [bx+si]: This instruction adds the value in the SI register to the value in BX. Effective address = 0x0100 + 0x0100 = 0x0200.
Note that in practical scenarios, the addressing of memory will also depend on the segment base, but based on the information given, we are only considering the offset addresses.