8. Assuming that (AX) = 001016 (BX) = 010016, and (DS) the XLAT instruction is executed? = 100016, what happens if

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**Question 8:** 

Assuming that (AX) = 0010<sub>16</sub>, (BX) = 0100<sub>16</sub>, and (DS) = 1000<sub>16</sub>, what happens if the XLAT instruction is executed?

---

**Explanation:**

This question pertains to the execution of the XLAT (Translate) instruction in an assembly language context, specifically within the x86 architecture.

1. **Registers and Values:**
   - **AX**: Contains the value 0010<sub>16</sub>.
   - **BX**: Contains the value 0100<sub>16</sub>.
   - **DS**: Contains the value 1000<sub>16</sub>.

2. **XLAT Instruction:**
   - The XLAT instruction is used to translate a byte in the AL register using a translation table starting at the address specified in the BX register. 
   - The effective address is calculated as DS:BX plus the unsigned value in the AL register. The byte at this address is fetched and placed back in AL.

3. **Operation:**
   - Assuming AL is initially a part of AX (011<sub>16</sub>), the XLAT instruction takes the byte in AL, adds it to the start of the translation table (specified by BX), and replaces AL with the byte at the resulting address in memory. The segment where the memory lookup takes place is determined by DS.

This question requires understanding of how memory addressing and instruction execution works in this assembly context and requires knowledge of hexadecimal operations as well.
Transcribed Image Text:**Question 8:** Assuming that (AX) = 0010<sub>16</sub>, (BX) = 0100<sub>16</sub>, and (DS) = 1000<sub>16</sub>, what happens if the XLAT instruction is executed? --- **Explanation:** This question pertains to the execution of the XLAT (Translate) instruction in an assembly language context, specifically within the x86 architecture. 1. **Registers and Values:** - **AX**: Contains the value 0010<sub>16</sub>. - **BX**: Contains the value 0100<sub>16</sub>. - **DS**: Contains the value 1000<sub>16</sub>. 2. **XLAT Instruction:** - The XLAT instruction is used to translate a byte in the AL register using a translation table starting at the address specified in the BX register. - The effective address is calculated as DS:BX plus the unsigned value in the AL register. The byte at this address is fetched and placed back in AL. 3. **Operation:** - Assuming AL is initially a part of AX (011<sub>16</sub>), the XLAT instruction takes the byte in AL, adds it to the start of the translation table (specified by BX), and replaces AL with the byte at the resulting address in memory. The segment where the memory lookup takes place is determined by DS. This question requires understanding of how memory addressing and instruction execution works in this assembly context and requires knowledge of hexadecimal operations as well.
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