Using DOS command to clear the CMOS password in the computer company win7 system

The specific steps are as follows:

1, in DOS there is an editor for everyone, is DEBUG, this Is a very practical tool, the specific startup method is: enter the command: DEBUG in the DOS command prompt state, and then press Enter, you can enter the DEBUG editing interface.

2. After entering the following command in the command state, restart the computer to clear the CMOS password. Here are five command lines to clear the CMOS password.

Method 1

-o 70 10

-o 71 10

-q

Method 2

-o 70 23

-o 71 34

-q

Method 3

-o 70 16

-o 71 16

-q

Method four

o 70 10

-o 71 ff

-q

Method Five

-o 70 11

-o 71 ff

-q

3, in the method five methods are used 70 and 71 Digital, this is because the data access in CMOS is realized by two I/O ports of 70 and 71. Port 70H is a byte address port for setting the address of data in CMOS, and port 71H is used. The read and write port 70H sets the contents of the data unit in the CMOS address.