Where are the BIOS checksum Bytes? How do I correct them?

RamonetB

Member
Jan 20, 2002
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I'm not well versed in checksum calculations or even how it is dealt with in a BIOS.
Generally you either store the checksum data for comparrison or utilize another algorithm based on the lower bytes of the final calculation.
From what I understand an AMI BIOS stores the checksum value.
Changing certain values in the BIOS will invalidate this calculation.
Where are these bytes stored and how do I deal with fixing a BIOS checksum error?

Do I have no idea what I'm talking about?
 

hinderson

Banned
Apr 5, 2000
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generaly a check sum error is caused by adding a card to the system ,and it didnt dealwith it well
or a setting that you set was in corect.
and or a bad battery can causit.
i have no real idea what it realy means BUT usualu the cure for it is (as long as there is a good battery) reset the bios.
use setup defaults.
then reboot.
the set your settings again that you want in the bios.
9 times out of 10 this corects a check sum error.
on a rare ocasion a bad flash can cause it also.
the most common setting that causes it is a memory setting
hope that helps
 

RamonetB

Member
Jan 20, 2002
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I think what you're thinking of is a CMOS checksum error.
And you're right, those are ways to deal with that error.

However, there is also a ROM BIOS checksum error which I believe occurs whenver the BIOS is corrupted or modified unofficially. Is is this situation that I have to deal with.

Thanks though.