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ms-dos秘密清楚
使用 LLM 解释/回答一下
“CMOS密码”就是通常所说的“开机密码”，主要是为了防止别人使用自已的计算机，设置的一个屏障。
“CMOS密码”破解方法很多，主要有以下几种：
一、更改硬件配置
当丢失CMOS密码时，你可以先试着改动机器的硬件后再重新启动，因为启动时如果系统发现新的硬件配置与原来的硬件配置不相同，可能会充许你直接进入CMOS重新设置而不需要密码。改动硬件配置的方法很简单：比如拔去一根内存条或安装一块不同型号的CPU（当然要主板支持）、更换一块硬盘等。
二、建立自已的密码破解文件
A. 当系统自检完毕，准备引导Windows时按下F8键，选择“Safe mode command prompt only”（安全命令模式）后在DOS提示符下输入COPY CON YK.COM，回车后在编辑环境里输入：
ALT+179、ALT+55、ALT++136、ALT+216、ALT+230、ALT+112、ALT+176、ALT+32、ALT+230、ALT+113、ALT+254、ALT+195、ALT+128、ALT+251、ALT+64、ALT+117、ALT+241、ALT+195后按F6保存。注意，输入以上数据时是先按下ALT键，接着按下数字键盘里（按键盘上面那一排数字键是没有作用的）的数字键，输完一段数字后再松开ALT键，然后再按下ALT键输入下一段数字…… 输入过程中，每松开一次ALT键屏幕上都会出现一个乱字符，我们不必管它。
保存退出后，我们直接运行YK.COM这个文件，屏幕上应该没有任何提示信息，然后重新启动计算机即可清除CMOS里的密码，当然，CMOS里的其它设置也会同时被清除，这就需要我们重新设置了。
B.启动时选择安全命令模式后，输下COPY CON YK.COM，然后在编辑环境里输入：
ALT+176、ALT+17、ALT+230、p、ALT+176、ALT+20、ALT+230、q、ALT+205、空格 后按F6保存后运行这个文件，重新启动计算机即可。
三、DEBUG法
在DOS提示符下，运行DEBUG后输入：
—o70 18
—o71 18
—q
或
—o70 21
—o71 21
—q
退出到DOS提示符后重新启动计算机便将CMOS密码完全清除了。请注意，70和71是CMOS的两个端口，我们可以向它们随意写入一些错误数据（如20、16、17等），就会破坏CMOS里的所有设置，有时间的朋友不妨多用几个数据试试。
四、万能密码
如果有人将COMS里的安全选项设为系统，那么当你每次开机时都必须输入正确密码，否则别说进入Windows，就连DOS也进入不了，这样我们就只能靠万能密码来解决问题了。
AMI 的BIOS： AMI ；Sysg
AWARD的BIOS： award ； Syxz； h996； wantgirl；eBBB ； dirrid 。
以上万能密码在386、486、奔腾主板上破解CMOS口令几乎百发百中，而对PII级或以上的主板就不那么灵光了，能破解PII以上的新主板的万能密码很少，几乎还没有听说过，不过小弟找到一个口令——abaubjao，已成功破解了承启6ATA4（PIII）、伟格MVP4（K6—2）、奔驰160A、160A+（PIII）等十余块主板上的CMOS口令，不敢独享，在此献给大家。
五、使用工具软件
在网上你会发现能破解CMOS密码的软件比比皆是，俺认为最好用的软件要数Biospwds，它是一个德国人做的小软件，使用时只需轻轻一点“Get passwords”（获得密码）按钮，你的CMOS密码便尽显于屏幕之上了，此外你还可以看到BIOS版本、时间等信息。有条件者可在 http://www.geocities.com/mbockelkamp处下载（或在本站的“系统工具”中下载）。
六、放电
如果你运气太差，用以上方法都破解不了CMOS口令，那就只有这一条路可走了。翻开主板说明书，找到清除CMOS设置的那个跳线，按说明书所述改变其短接的方法，清空CMOS。什么，你的主板太老，没有此跳线？ 那就将主板上那块钮扣电池取下来吧。 放电后怎么开不了机？ 将电池安回去嘛
"CMOS password" is what is usually called "boot password", mainly to prevent others from using their own computer, a barrier set up.
There are many ways to crack the "CMOS password", mainly the following types:
I. Change hardware configuration
When the CMOS password is lost, you can first try to change the hardware of the machine and then restart, because if the system finds that the new hardware configuration is different from the original hardware configuration during startup, it may allow you to directly enter the CMOS to reset without a password. The method of changing the hardware configuration is very simple: for example, remove a memory stick or install a CPU of a different model (of course, the motherboard supports it), replace a hard disk, etc.
II. Create your own password cracking file
A. When the system self-test is completed and ready to boot Windows, press the F8 key, select "Safe mode command prompt only" (safe command mode), and then enter COPY CON YK.COM at the DOS prompt. After pressing Enter, enter in the editing environment:
ALT+179, ALT+55, ALT++136, ALT+216, ALT+230, ALT+112, ALT+176, ALT+32, ALT+230, ALT+113, ALT+254, ALT+195, ALT+128, ALT+251, ALT+64, ALT+117, ALT+241, ALT+195, then press F6 to save. Note that when entering the above data, first press the ALT key, then press the number keys on the numeric keypad (pressing the number keys on the top row of the keyboard is not effective), release the ALT key after entering a segment of numbers, then press the ALT key to enter the next segment of numbers... Each time you release the ALT key during input, a random character will appear on the screen, and we don't need to care about it.
After saving and exiting, we directly run the YK.COM file. There should be no prompt information on the screen, and then restart the computer to clear the password in the CMOS. Of course, other settings in the CMOS will also be cleared at the same time, which requires us to reset them.
B. When starting, select the safe command mode, then enter COPY CON YK.COM, and then enter in the editing environment:
ALT+176, ALT+17, ALT+230, p, ALT+176, ALT+20, ALT+230, q, ALT+205, space, then press F6 to save and run this file, and restart the computer to do so.
III. DEBUG method
At the DOS prompt, run DEBUG and then enter:
—o70 18
—o71 18
—q
or
—o70 21
—o71 21
—q
Exit to the DOS prompt and restart the computer to completely clear the CMOS password. Please note that 70 and 71 are two ports of the CMOS, and we can randomly write some wrong data (such as 20, 16, 17, etc.) to them, which will damage all settings in the CMOS. Friends with time might as well try with several more data.
IV. Universal password
If someone sets the security option in COMS as the system, then every time you start the computer, you must enter the correct password. Otherwise, not only can you not enter Windows, but you can't even enter DOS. In this case, we can only rely on the universal password to solve the problem.
AMI's BIOS: AMI ；Sysg
AWARD's BIOS: award ； Syxz； h996； wantgirl；eBBB ； dirrid.
The above universal passwords are almost 100% effective in cracking the CMOS password on 386, 486, and Pentium motherboards, but they are not so effective for PII-level or above motherboards. There are very few universal passwords that can crack new motherboards above PII, and almost no one has heard of them. However, the author found a password - abaubjao, which has successfully cracked the CMOS passwords on more than a dozen motherboards such as the Chenqi 6ATA4 (PIII), Weige MVP4 (K6—2), Benz 160A, 160A+ (PIII), etc. The author doesn't want to keep it to himself and presents it to everyone here.
V. Use tool software
You will find that there are countless software that can crack the CMOS password on the Internet. The author thinks the best software is Biospwds, which is a small software made by a German. When using it, just click the "Get passwords" (obtain password) button gently, and your CMOS password will be fully displayed on the screen. In addition, you can also see the BIOS version, time and other information. Those with conditions can download it at [url]http://www.geocities.com/mbockelkamp[/url] (or download it in the "System Tools" of this site).
VI. Discharge
If you are too unlucky and can't crack the CMOS password with the above methods, then there is only this way. Open the motherboard manual, find the jumper for clearing the CMOS settings, and change the short-circuit method as described in the manual to clear the CMOS. What, your motherboard is too old and has no such jumper? Then take off the button battery on the motherboard. Why can't you start the computer after discharging? Put the battery back.
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