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How To Manually Fix The High Speed Issue Manually On 95 RTM.

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I have the original version of Windows 95 as well as OSR2. I have numerous computers that run Windows 95 or 95a fine. But my grandmother gave me one made from circa 2000. It is a Compaq Presario. The update for OSR2 works on the updated version of Windows 95 but it is a pain because you will have to copy the updated ios.vxd and esdi_506.pdr from a floppy disk and manually copy them from a DOS command prompt as with OSR2, it won’t even boot into Safe Mode only command prompt only. Every boot says “While Initializing Device IOS: Windows Protection Error”. But after the files have been replaced, Windows 95b will run regularly but I run the update normally just to update any additional files or any registry entries. My guess is because it is a Pentium 4 processor. But with the RTM version, the version I want to use for specific reasons (educational and to make a few recordings etc. as for some reason Windows 95 works real well on it), Safe Mode and the command prompt always works and occasionally it will boot up normally, but most times you get “Windows Protection Error: You Must Restart Your Computer”. And FIX95CPU does patch it but I’d rather manually fix it and I’m sure it’s possible and you could probably even add FAT32 support with rework. It seems to be a “divide exception” issue. But older versions of Windows work fine including Windows 3.1. Not to mention I was able to use the full 18 GB hard drive on a single partition on Windows NT 3.51. All I had to do is replace ntfs.sys, atapi.sys and atdisk.sys from the Windows NT 4.0 SP6a update and disabled atdisk.sys in Control Panel as Windows NT 4.0 does the same when you apply the Service Pack otherwise without disabling it, you get some error saying the device failed to load but the file still needs to be updated and they can be replaced from within Windows if you are an Administrator and then restart the computer. I just extracted the files from the Service Pack. Then to use the remaining hard drive space, I used PowerQuest Volume Manager and extend the remaining hard drive space as the Disk Manager in Windows NT does not allow you to extend the system partition. And FAT32 can easily be added by just replacing one file. But if you could help me manually fix the high speed processor error on Windows 95, I would really appreciate it. I’m pretty sure it is possible and Microsoft even claims it’s a bug in the software but would not patch it. Especially if FIX95CPU was created.


1 Answer

  1. This guy has created a fix provided you can make a bootable floppy or burn a CD .iso image to install his update with. This will allow a fix to be put in without too much dancing. It does seem to need some reading to get there though.…

    Can’t agree more with 98se as minimum useful DOS based OS, but you don’t seem to be the type that really wants to hear this part, so best of luck. I figure you will need plenty.

    As to fixing RTM manually it would seem you need to make the floppy, go to the folder of interest and move those files as per the batch files. But there is a registry entry that just might need to be in place upon boot up which might mean you need to let the floppy do it for you as it was designed to.

    I would let this floppy find the OS installed and execute as designed. Because you mention RTM, 95a and 95b, but we don’t know which it is you want fixed. Seems to matter too.

    What I did notice in passing was that the earlier version of 95 fix had the DUN 1.4 update in it and it appears to be non existent in the final 3 version. The fix is the DUN 1.4 update. You might ought to get both fix95 updates. WinZip will extract the files from inside their .exe files too.


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