11) What will be the value of BX after the following instructions execute? mov bx, 91BAh and bx, 92h

Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
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### Question 11) What will be the value of BX after the following instructions execute?

```assembly
mov bx, 91BAh
and bx, 92h
```

### Analysis

To determine the result of these instructions, let's break them down step-by-step.

1. **First Instruction: `mov bx, 91BAh`**
   - This instruction moves the hexadecimal value `91BAh` into the BX register.
   
   Let's convert `91BAh` to binary to understand its bits:
   ```
   91BAh (hex) = 1001 0001 1011 1010b (binary)
               1    0    1    0
             1001 0001 1011 1010
   ```
   
2. **Second Instruction: `and bx, 92h`**
   - This instruction performs a bitwise AND operation between the current value in BX and `92h`.

   Let's convert `92h` to binary:
   ```
   92h (hex) = 1001 0010b (binary)
              1    0   0    1  
              1001 0010
   ```
   
   To perform the AND operation, we'll align both binary values:
   ```
   1001 0001 1011 1010 (91BAh)
   AND     1001 0010 (92h)
   -----------------
          0000 0010 (result)
   ```

3. **Final Result:**
   - After performing the bitwise AND operation, the resulting value in BX is `2h`.

### Conclusion

The value of BX after executing the given instructions will be `2h`.
Transcribed Image Text:### Question 11) What will be the value of BX after the following instructions execute? ```assembly mov bx, 91BAh and bx, 92h ``` ### Analysis To determine the result of these instructions, let's break them down step-by-step. 1. **First Instruction: `mov bx, 91BAh`** - This instruction moves the hexadecimal value `91BAh` into the BX register. Let's convert `91BAh` to binary to understand its bits: ``` 91BAh (hex) = 1001 0001 1011 1010b (binary) 1 0 1 0 1001 0001 1011 1010 ``` 2. **Second Instruction: `and bx, 92h`** - This instruction performs a bitwise AND operation between the current value in BX and `92h`. Let's convert `92h` to binary: ``` 92h (hex) = 1001 0010b (binary) 1 0 0 1 1001 0010 ``` To perform the AND operation, we'll align both binary values: ``` 1001 0001 1011 1010 (91BAh) AND 1001 0010 (92h) ----------------- 0000 0010 (result) ``` 3. **Final Result:** - After performing the bitwise AND operation, the resulting value in BX is `2h`. ### Conclusion The value of BX after executing the given instructions will be `2h`.
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