Homework Help is Here – Start Your Trial Now!
Engineering
Computer Science
8. Assuming that (AX) = 001016 (BX) = 010016, and (DS) the XLAT instruction is executed? = 100016, what happens if

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

Database System Concepts
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
Chapter1: Introduction
Section: Chapter Questions
Problem 1PE
See similar textbooks
icon
Related questions
Question
**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.
Expert Solution
steps

Step by step

Solved in 2 steps

SEE SOLUTIONCheck out a sample Q&A here
Blurred answer
Knowledge Booster
Fundamentals of Computer System
Learn more about
Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, computer-science and related others by exploring similar questions and additional content below.
Similar questions
Recommended textbooks for you
Database System Concepts
Database System Concepts
Computer Science
ISBN:
9780078022159
Author:
Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:
McGraw-Hill Education
Starting Out with Python (4th Edition)
Starting Out with Python (4th Edition)
Computer Science
ISBN:
9780134444321
Author:
Tony Gaddis
Publisher:
PEARSON
Digital Fundamentals (11th Edition)
Digital Fundamentals (11th Edition)
Computer Science
ISBN:
9780132737968
Author:
Thomas L. Floyd
Publisher:
PEARSON
C How to Program (8th Edition)
C How to Program (8th Edition)
Computer Science
ISBN:
9780133976892
Author:
Paul J. Deitel, Harvey Deitel
Publisher:
PEARSON
Database Systems: Design, Implementation, & Manag…
Database Systems: Design, Implementation, & Manag…
Computer Science
ISBN:
9781337627900
Author:
Carlos Coronel, Steven Morris
Publisher:
Cengage Learning
Programmable Logic Controllers
Programmable Logic Controllers
Computer Science
ISBN:
9780073373843
Author:
Frank D. Petruzella
Publisher:
McGraw-Hill Education
SEE MORE TEXTBOOKS