“Assembly Language”, 3rd Edition by Wang Shuang Chapter 13: int Instruction (Page 262) Experiment 13: Writing and Applying Interrupt Routines ———————————— Note: This is the code example and analysis for Experiment 13, Question 2. ———————————– (2) Write and install the int 7cH interrupt routine, which implements the functionality of the loop instruction. Parameters: (cx) = … Read more
Overview of the LOOP Instruction The LOOP instruction is a loop control instruction in 8086 assembly language, combining the functionality of decrementing a counter and conditional branching. This instruction is a short jump instruction, with a jump range limited to -128 to 127 bytes. Instruction Format and Functionality Instruction Format: <span>loop label</span> Functionality: First, decrement … Read more
“Assembly Language”, 3rd Edition by Wang Shuang Chapter 9: Principles of Transfer Instructions Checkpoint 9.3 (Page 185) Complete the program to use the loop instruction to find the first byte with a value of 0 in the memory segment 2000H, and store its offset address in dx after finding it. assume cs:codecode segment start: mov … Read more
![Assembly Language: Understanding the [BX] Register and Loop Instructions](https://boardor.com/wp-content/uploads/2025/10/8e4a8191-ad29-4c55-a265-2fb9987258d4.jpg)
This series will explain the book “Assembly Language”. This section covers Chapter 5 – **[BX] Register and Loop Instructions**. In this section, we introduce another way to describe memory, the [BX] register, and the commonly used loop instruction: loop, discussing its applications, significance, and related content. The entire text uses (ax) to represent the contents … Read more
![Understanding the [BX] Register and the Loop Instruction in Assembly Language](https://boardor.com/wp-content/uploads/2025/05/9053c842-bf5a-494b-bfcf-e694de1d78bf.jpg)
[BX] Register and Loop Instruction [BX] and Memory Cell Description [0] represents a memory cell with a byte length of one, where 0 indicates an offset address of 0, and the segment address is stored in ds. From this, we can see that describing a memory cell requires two pieces of information: the address of … Read more