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flat assembler > Main > Offset of BIOS password in CMOS RAM?

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Apolo



Joined: 18 Mar 2017
Posts: 23
Offset of BIOS password in CMOS RAM?
Where is the offset of BIOS password in CMOS RAM? I want to get BIOS password using I/O ports 70h - 7Fh. How get it?
Post 06 Apr 2017, 12:40
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revolution
When all else fails, read the source


Joined: 24 Aug 2004
Posts: 15152
Location: GW170817
Every BIOS is different. There are no fixed offsets. Have you tried emailing the BIOS company?
Post 06 Apr 2017, 13:02
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Apolo



Joined: 18 Mar 2017
Posts: 23

revolution wrote:
Every BIOS is different. There are no fixed offsets. Have you tried emailing the BIOS company?



I want the offsets for AMI BIOS and Phoenix BIOS,
Post 06 Apr 2017, 13:48
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revolution
When all else fails, read the source


Joined: 24 Aug 2004
Posts: 15152
Location: GW170817

Apolo wrote:
I want the offsets for AMI BIOS and Phoenix BIOS,

Yes, but different versions have different offsets. Have your tried emailing AMI and Phoenix?
Post 06 Apr 2017, 13:49
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Apolo



Joined: 18 Mar 2017
Posts: 23

revolution wrote:

Apolo wrote:
I want the offsets for AMI BIOS and Phoenix BIOS,

Yes, but different versions have different offsets. Have your tried emailing AMI and Phoenix?



Where can I get the emails of manufacturers???
Post 06 Apr 2017, 14:22
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revolution
When all else fails, read the source


Joined: 24 Aug 2004
Posts: 15152
Location: GW170817
Probably from their respective websites.

They might even have some form of technical manual for download giving all the pertinent information.
Post 06 Apr 2017, 14:23
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Kenneth Zheng



Joined: 30 Apr 2008
Posts: 8
Location: Shanghai, China
Legacy BIOS used the CMOS RAM to store the user and admin passwords, but UEFI BIOS will store the user and admin passwords into the BIOS ROM. So if you clear the CMOS RAM, it doesn't affect the user and amin passwords in the UEFI BIOS.

I think that the machine after 2005 should use UEFI BIOS now.


Kenneth Zheng

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Pure Assembly Language Funs
Post 22 Sep 2017, 02:16
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Feryno



Joined: 23 Mar 2005
Posts: 439
Location: Czech republic, Slovak republic
Kenneth Zheng is right. Recently I tried to erase the whole cmos in 3-years old laptop and it did not help, a supervisor password set on manufacturing persisted - I suppose in nvram.
This site helped me at the end:
https://bios-pw.org/
Then I was able to enter uefi setup and enable locked laptop features.
Post 29 Sep 2017, 13:26
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