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Checksum Error?

Posted on 1998-11-13
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Last Modified: 2013-12-28
I have a AMD K-6 300MHz with 64 MB RAM.  I just upgraded
to Win 98 from Win 95 a few weeks ago.  Occassionally,
when I boot the computer, I get a "Checksum Bad" error.
When this happens, my floppy 5.25 B: drive is disabled.
I have to go into CMOS and enable it.  Then everything is
fine.  What is causing these checksum errors and how do I
get rid of them?
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Question by:grshpr
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MATTCEI earned 100 total points
ID: 1647490
If only the 5.25 FD setting is getting changed,you most likely have a bad location in CMOS ram,and there's not much you can do about it.There's an outside chance the 5.25 is failing the 'Floppy Drive Seek' routine at bootup,but this shouldn't cause a CMOS checksum error.Try turning this off,see if that fixes it.

However,if after the error you find that all CMOS values (except possibly date/time) have been set back to default,it's probably just a weak CMOS battery.Could be that the only NON-default value is the 5.25 setting - try changing something else and see if that disappears also.A voltmeter would be required here;you should see close to 3 volts across the battery.If it's a rechargable type (usually blue and barrel shaped,right rear area of the motherboard),measure it after the system's been powered off for ~ 1 hour.If it's a 'button' battery (shiny,size of a quarter),just cleaning it with alchohol may do the trick.

One other possible cause is using an old XT power supply on an AT motherboard,but that's an unlikely scenario these days.
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by:grshpr
ID: 1647491
Oh yes, I forgot to mention that after I fix the error, the date in win 98 is wrong.
Does this affect your answer at all?
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by:MATTCEI
ID: 1647492
No - that's good.Means it's probably just a weak battery.

One more thing you should check,though,but only if you were inside the case changing jumpers on the motherboard recently: verify that the '~internal battery' jumper is correct.
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by:ahmed_s75
ID: 2553577
does the weak battery make the flobby not to operate ?
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