• Assembly Experiment4


    AIMS & PREPARATIONS of THIS EXPERIMENT:

    SCREENSHOTS of THIS EXPERIMENT:

    1.

     

    change 0403h to 0441h

    Now, I find myself made a mistake:

    the former code:

    see, only ( inc bx ) for one time

    it include 16*2 byte unit, so (bx)=(bx)+1 should twice

    after:

    now :

    change 0403h to 0410h

     2. task code:

    using d command :

    I find that ,in 0:23F, there is no number !

    so I changed 63 to 64

    then compile, link, run and debug

    using d command:

    now the task is finished !

    3.experiment 4(3) on the book, page 121

    copy the code from beginning to ( mov ax, 4c00h ) to internal memory

    certainly, the first step is move the current cs address to register ds for the beginning of the program

    however, we don't konw the length of the whole program

    so give register cx a radom number to test ( use command u in debug to check the length )

    we can see that the program is from (076A:0000) to (076A:0016)

    the length is 0017H

     so we correct the program's code:

     

     

    using d command in debug.exe

    actually, the statements are copied in (0000:0200) to (0000:0217) occupy 0017H units

     SUMMARY & REVIEW of THIS EXPERIMENT :

     In this experiment, we learned how to use loop and [bx] to realize circulation.

    Because of grasping the methid to use masm,link and debug, the experiment is easy to carry on.

    But what is most sigificant in this experiment is the handling of byte unit, in the experiment task1 and 2, we may easily confused by the using of command (inc) owing to the difference of word unit and byte unit. In this case, double (inc bx) is needed.

  • 相关阅读:
    数据库新增“自动添加”类字段 auto_now_add 如何不影响之前数据
    django rest framework serializer中获取request中user方法
    django Table doesn't exist
    python 日期换算星期 蔡勒公式
    python pdfkit html转pdf响应式轮子 django例
    Python Excel 多sheet 多条数据 自定义写入
    Python 爬虫 Vimeo视频下载链接
    Python 快速排序 算法
    jvm内存模型
    JMV的学习
  • 原文地址:https://www.cnblogs.com/mrorangerabbit/p/9977835.html
Copyright © 2020-2023  润新知