Mike C

Thanks. I actually just happened to try replacing it with a 100 MHz SV8B a few minutes before seeing your message and it works!! The CPU that did NOT work is an Am80486DX4-100NV8T. All is well now, thanks for all of your replies!

I will try this, but I'm at the work at the moment. In the mean time, does anyone have the model number of a 486 known to work with this XP? In case I need to buy another.

Digging into it further, the 0x0000007E STOP code means SYSTEM_THREAD_EXCEPTION_NOT_HANDLED. Parameter 1, 0xC000001D, means STATUS_ILLEGAL_INSTRUCTION. According to https://learn.microsoft.com/en-us/openspecs/windows_protocols/ms-erref/596a1078-e883-4972-9bbc-49e60bebca55 So there's an opcode the 486 doesn't like getting executed somewhere. @Dietmar I hate to bother you again, but do you know what I should do to find what module is executing an illegal opcode? If I start it in safe mode, it goes further and actually initializes graphical mode for a few moments but then I get another illegal instruction crash in KSecDD.sys but I don't know if this is the same module that is causing a blue screen when booting in normal mode.

Instead of that, I removed the ATI card and installed an Nvidia TNT2. I also removed the 3C509 NIC. It still gives me the same blue screen. I even installed a brand new IDE SSD, reinstalled XP and it still crashes.

No 3rd party drivers, and I don't have any odd cards plugged installed either. Just an ATI Rage Pro and a 3C509 ISA network card.

The text installer finished, but it won't boot into the second graphical part of setup. I get a blue screen with stop code 0x0000007E and first parameter 0xC000001D Is this because I haven't copied ntoskrnl.exe to the hard disk from the CD? I didn't have to do this when I tested in 86Box. Do I need to run the expand command on ntoskrnl.ex_ from the CD, or is there an already uncompressed patched version that I need to copy? EDIT: The ntoskrnl.exe on the hard disk already has a date stamp of April 29, 2024 so it would seem to already be the patched version. So I'm not sure what causes the blue screen.

I will try soon.

I can't explain this at all, but I just put the hard disk in as SECONDARY master with CD-ROM as secondary slave and now it works! I would say something is wrong with my primary IDE controller, but it works with Windows 2000 so I don't know what's going on. I don't mind leaving it as secondary master, but what a strange problem this is! Anyway, it no longer gives me the error and I created a partition and formatted as NTFS. Now the text-based installer is copying files to the hard disk. I will edit this post later to say whether it worked completely and lets me boot into XP.

I will try this, but yes I'm sure the disks are working. They all work perfectly with Windows 2000. 2000 installs and runs normally on the same motherboard, CPU and disks. It's a very strange issue, 2000 works but not XP! So the disks and IDE controller seem to work. I may also try to clear the CMOS and start over.

It is recognized in the BIOS and it works with Windows 2000, but not XP. EDIT: I have been trying the English ISO. I will try the German version. Früher konnte ich ein bisschen Deutsch. Das meiste habe ich vergessen. EDIT 2: The German ISO gives the same error unfortunately. I'm not sure what's wrong. You didn't need to load special drivers for the UMC8886 IDE controller?

Thanks, I'm already using the 2001 Award BIOS and I have tried a 10 GB and 15 GB mechanical IDE drive, both jumpered as master on primary IDE channel. Do you have your CD-ROM on the same channel as the hard disk? I have been using hard disk on primary master and CD-ROM on secondary master. My boot order is CDROM, C.

Sigh. Another issue. "Setup did not find any hard disk drives installed in your computer" no matter what known good drive I install. Windows 2000 did not have this problem, it installs and runs fine. This is a Shuttle HOT 433 rev 1-3. @Dietmar isn't this the same board you're using? Did you have to do anything special to get Windows setup to see your hard drives? I'm using the Award 2001 BIOS.

UPDATE: I figured it out. The CPU was the issue. It doesn't want to start the kernel on an Intel DX4/100. Codes stamped on this CPU are as follows: A80486DX4100 L5473524 3VOLT SK051 I replaced with an Am486DX4/100 and the XP kernel now boots! Could the intel possibly not have supported CPUID? I thought any DX4 was late enough to support it, but could be mistaken.

The text-based installer doesn't work, this is the issue. It loads some drivers from the CD, but then crashes as it starts the Windows kernel.

First, this is fantastic and I've been waiting to see XP patched for the 486 for a very long time! However, I have a problem installing. I have a Shuttle HOT-433 v1-3 motherboard with the 2001 Award BIOS. It has 128 MB of RAM, 512 KB cache and a 486 DX4/100. I can boot the patched ISO on the machine, and setup proceeds through the first section where it loads a lot of files/drivers from the CD. As soon as it finishes this and tries to start the Windows kernel, it crashes with a blue screen. STOP 0x0000007F error. If I use the same patched ISO to install it in 86Box, it works correctly. Also, installing Windows 2000 DOES work on this motherboard.