If AL contains A016, what happens when the instruction CBW is executed?

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
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### Instruction Execution in Assembly Language

**Query:**

23. If AL contains `A0₁₆`, what happens when the instruction CBW is executed?

**Explanation:**

The question addresses the execution of the CBW (Convert Byte to Word) instruction in assembly language, specifically concerning the contents of register AL. When AL contains the hexadecimal value `A0₁₆`, executing CBW will convert the signed byte in AL to a word in AX. This involves extending the sign of the byte to the upper byte of AX, effectively turning the 8-bit AL register into the 16-bit AX register while preserving the sign.
Transcribed Image Text:### Instruction Execution in Assembly Language **Query:** 23. If AL contains `A0₁₆`, what happens when the instruction CBW is executed? **Explanation:** The question addresses the execution of the CBW (Convert Byte to Word) instruction in assembly language, specifically concerning the contents of register AL. When AL contains the hexadecimal value `A0₁₆`, executing CBW will convert the signed byte in AL to a word in AX. This involves extending the sign of the byte to the upper byte of AX, effectively turning the 8-bit AL register into the 16-bit AX register while preserving the sign.
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