How can you clear your BIOS with the DOS DEBUG command ?

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Clearing your CMOS or BIOS via the DOS Debug command depends on whether you have an AMI, Award or Phoenix based BIOS.

Solution 1: for AMI and Award BIOSs:

C:\DEBUG (at a clear DOS prompt, don't do this in DOS-box in Windows)
-O 70 17
-O 71 17
Q

Solution 2: for Phoenix BIOSs:

C:\DEBUG (at a clear DOS prompt, don't do this in DOS-box in Windows)
-O 70 FF
-O 71 17
Q

Go back to our BIOS FAQ.

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About

My name is Wim Bervoets and I'm the founder of Wim's BIOS Page. The history of this site goes back to 1996 when I was taking my first steps on the internet. Gradually the site grew to what it is now - an authority site about BIOS update information - with an active forum.

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Fill in your name and email and receive our ebook 'How to update your PC BIOS in 3 easy steps' (15$ value), free BIOS tips and updates about Wim's BIOS!