Help 486 upgrade

[jayzad]

I had a 486 dx2 66mhz in a computer. I put a Intel Overdrive PODP5V cpu in it. When I rebooted it worked and said the new processor was 100mhz. Do you think I needed to change the clock settings first.
Thanks jayzad

[jayzad]

After I put the overdrive cpu in the computer it worked. I then formated the hard drive and installed dos 6.22. I rebooted and it said no opt. sys. So I rebooted with a sys disk, and checked to see what was on the h-drive. The drive was there along with its sys,config,auto..exe and its dos directory files I just loaded.
I even went back and put the 486dx2 cpu back in and it still has the problem.
Any ideas why it says it has no opt. sys. after I formated the h-driv.
Thanks jayzad nebie

[This message has been edited by jayzad (edited 05-22-99).]

[This message has been edited by jayzad (edited 05-22-99).]

[Butch]

First of all the overdrive chip you installed is it working correctly? I assume it is a 100mhz chip, I have upgraded a couple of times in the past and both times I have had to repin the motherboard. But if it working correctly I guess it is alright. Now the reason it is not booting is that you don't have a command.com file in your computer. At least you didn't list it as one of the files on your h-driv. Check and see you need this file to start you computer. If it isn't there try to reformat process again then see what happens. Good luck

[This message has been edited by Butch (edited 05-22-99).]

[MR COMPUTER]

I did one a while back.The best I can remember,no repining,the OD chip did it all. http://www.sysopt.com/forum/wink.gif

[jayzad]

It is a 100mhz. But I put the dx2 back in to see if it would help with my problem. It did not. Yes it is fast. I've formated the drive twice. The drive does have a command.com file. I thought comm..com is part of the sys files.
ps since the overdrive cpu worked when I had in the clock was set correctly. What is it set 33mhz. What do you mean ( you had a ripin motherboard.

[This message has been edited by jayzad (edited 05-22-99).]

[jayzad]

When I boot It still says I have no opt. sys.
The cmos seems ok. What could it be. I've even tried a different formated drive. Any other ideas. Boot strap???
Thanks


[This message has been edited by jayzad (edited 05-22-99).]

[Butch]

The version of dos 6.22 is it a full version or a upgrade. The command.com is supposed to be in your root dir. Check your disks and see if it has command.com on one of them.

[CMonster]

What kind of computer is it? And did you fdisk or just format? You said you have a boot disk and can see the contents of the drive - correct?

Boot with floppy and transfer the system files i.e. A:\>sys c: (and press enter

...if it is still not working try A:\>fdisk /mbr press enter, then reboot, and then transfer the system files as described above.

Are you planning to install Windows95/98? You know you do not have to install DOS first? You can boot with a Windows floppy that has the CDROM drivers on it, and install from the CD.

[scourge]

If CMonster's advice doesn't work you can also try reformatting your hdd with the /s command. "format c: /s" this should transfer command.com from your bootable floppy after the format is complete.

Also, once you have your new overdrive processor installed. See if you can set it for 4x operation. You may be able to get it to run at 33x4=133 or 40x3=120 or even 40x4=160. Check you mobo manual to see what jumpers you have to change to get the different clock speeds. Make sure you have the cpu internal cache turned on. This will greatly improve the performance of the CPU.