It is the fact that every operating system must load the BIOS password information. If BIOS password is booted successfully one can have the glimpse of the BIOS password. One should know the memory address where the BIOS password is loaded and at the same time one should know the format in which the BIOS password is loaded. The system must store a program that is very acquaited with these things. In this connection it can be said that one can jot down one’s program to go through the BIOS password from the CMOS memory on a PC by jotting down the address of the byte of the CMOS memory that one can be eager to go through in port 0x370 and then going through the matter of the port 0x371. As a part of the next step, BIOS is accountable to regain the BIOS password for the most common BIOS versions, with the inclusion of IBM, American Megatrends Inc, Award and Phoenix. For the sake of the following BIOS versions Cmospwd will regain the BIOS password.



IBM (PS/2, Activa, Thinkpad)

Packard Bell

Phoenix 1.00.09.AC0 (1994), a486 1.03, 1.04, 1.10 A03, 4.05 rev 1.02.943, 4.06 rev 1.13.1107

Phoenix 4 release 6 (User)

Gateway Solo - Phoenix 4.0 release 6

Toshiba

Zenith AMI

ACER/IBM BIOS

AMI BIOS

AMI WinBIOS 2.5

Award 4.5x/4.6x/6.0

Compaq (1992)

Compaq (New version)

It is seen that if someone is not able to get the accessibility of the operating system after this having been powered in, however it is still feasible to get past the BIOS password. The BIOS password is loaded in CMOS memory that is governed at the time of the computer being switched off by a small battery which is usually inserted into the motherboard. If some takes the battery off the system, all CMOS data with the inclusion of the BIOS password will be deleted. So one has to make the re-entry of the correct CMOS setup.