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Problems with a New CPU

Posted on 1998-09-14
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Last Modified: 2010-04-27
I have a Tyan Tomcat IV motherboard with a P75 CPU running Windows 98.  I want to "upgrade" the P75 CPU to an AMD K6 200 (which the board supports).  

I installed the new CPU chaning all jumper and voltage settings as per my manual.  Windows is not ahppy with this at ALL.

I started the system and confirmed that the BIOS recognized thenew chip.  Windows gave me some type of error that there was a probem wiht my files and I would need to restart (don't recall the exact error).  This happened a couple of times so I decided to just reinstall W98.  Well Scandisk kept reporting gazillions of errors (and fixing them).  The closest I ever got was just past the "copying files for setup..." and then the system locks up.  I finally switched all jumpers back and put the old CPU in.  W98 is very happy with this setup.

What am I doing wrong?
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Question by:Kuba
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storm996 earned 100 total points
ID: 1125112
Kuba,
If you have triple-checked the jumper settings and even double checked that any printing on the board matches the manual, I suggest that you check out the latest bios version from:
ftp://ftp.tyan.com/bios/tomcat4/awd/hx669102.zip
This is ver 1.02 and in the details of version 1.00 support for the K5 was added, you might just need 1.02 for proper K6 support.
I have also seen a similar problem caused by dodgy ram, can you change this for test purposes? 2 x 4Mb would be enough to prove something.  Also check any relevant memory speed settings in the bios.
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by:Kuba
ID: 1125113
Sigh.. why is nothing ever easy :)  I decided to start first with the BIOS as the version you recommend is more current than what I am running. I downloaded the update as well as the flash writing utility (virgin experience updating BIOS).  All seemed fine but I could fully boot.  Around the time that W98 should start I recieve the error "Invalid system disk."  A reboot gave the same message.  I reinsalled the old BIOS and now all is well.

So evidently I am "missing something" when it comes to a new BIOS.  Once I get the BIOS working properly (I am assuming you will have a sugeestion) should I be able to boot right into Windows or will Windows want to somehow be "notfied" of the changes?
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Author Comment

by:Kuba
ID: 1125114
well, I'm half way home.  I found that if I setup the HDs in BIOS again I was fine.  However W98 still isn't very happy.  I have found a way to start W98 but I lose my CD to do so.  At this point I'll close this question and try another that is W98 specific.
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Expert Comment

by:storm996
ID: 1125115
Looks like a quick CD trouble shooting session is needed.  OK I assume the CD is IDE and on the secondary controller as a slave.  You could try installing the dos drivers for the cd (device=cdrom.sys (or whatever its driver is called) in config.sys).  This might 'remind' Win98 that there is a CD.  Next thing to look at is the HDD controller section in device mangler, and possibly d/l from the Tyan site their version of the busmastering drivers.  Worth a try.  I'll now go look see if you've asked a question in Win98!
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