Dietmar

@roytam1 I tried this, but get only a lot noise at start. No enumerating of memory. I think, that those roms are hard wired Dietmar

Hi, until now, I do all my tests on real hardware: The 486 Shuttle Hot 433 board, vers. 1..3 with 1024kB Cache and 256MB Ram. There I flashed the Bios from Award 2001(!) . It has a mod, for to disable the PS/2-mouse by default. mio.bin https://ufile.io/trzn0n6x Now I try to use the nice Emulator for x86 cpus https://github.com/86Box/86Box Is there a way, to add this mio.bin Bios to the 86Box? Because this Bios allows boot from Cdrom and large harddisks Dietmar PS: By the way, which is the last version of this Emulator, that works under XP SP3?

@roytam1 Oh, thanks, I am going to test. https://www.youtube.com/watch?v=zqsKbE0qH2I Just I read this https://www.pcgameshardware.de/Windows-Software-277633/News/Intel-i486-CPU-XP-1447805/ https://www.xda-developers.com/windows-xp-running-cpu-ten-years-older-itself/ https://www.tomshardware.com/software/windows/enthusiast-gets-windows-xp-running-on-an-i486 https://www.reddit.com/r/windowsxp/comments/1ctlglw/windows_xp_finally_works_on_486_processors/ https://itc.ua/en/news/a-combination-of-two-eras-windows-xp-launched-on-intel-i486-processor/ Do you have an idea, why the speed on a HD is so slow and using the PCI-slots with PCI to IDE/Sata is even more slow Dietmar

@user57 There must be something going complete wrong, using the PCI bus for installation of XP SP3 in compare with the original implemented IDE slots on the Shuttle Hot 433 board with 486 cpu. For the first TXT-Setup of XP I need about 45 min with the IDE slots, same cpu. With a PCI to IDE or PCI to Sata card, which should have full performance of 132 MByte/sec of the PCI bus (33 MHZ, 32 bit with 32 bit=4*8bit, gives 132 MByte/sec). But Now I need about 9(!) hours for the same TXT mode. This is a factor of 12 compared to the original IDE slots. So, the real speed of the PCI Bus is not 132 Mbyte/sec but for sure less than 11 MByte/sec, even the connected Sata or IDE harddisk is about 60 MByte/sec. And the PCI cards fulfill all to be faster than 132 MByte/sec Dietmar EDIT: The speed of this PCI bus is less than an original CD-ROM with speed 1, means 150Kb/s. Whole install of XP via Floppy disk with 200kB/sec would be faster..

Now I also succeed to install XP SP3 on the Shuttle Hot 433 board to a 486 cpu using the Dawicontrol DC-150, with newest flashed Bios for NON-Raid modus. This card is a PCI to Sata card, this means for the very first time I can boot XP SP3 for a 486 cpu via a fast Sata HD, nice Dietmar EDIT: Strange, during install via PCI to IDE/Sata card the install lasts much longer than with the integrated IDE ports?! A HD speed test with CrystalDiskMark5 using the integrated IDE ports, always crashes. I hope, that I can get some valid results via the PCI cards. EDIT2: Oh..crazy, the Bios puts in Standard Settings the speed of the PCI bus to halve of its original value..

@roytam1 After soso many fails I succeed to install XP SP3 to the Shuttle Hot 433 board with 486 cpu via an PCI slot using the PCI to IDE controller card Dawicontrol DC-133 and fresh flashed Bios from Silicon https://ufile.io/c41pi7rw Videocard is in Slot 1 (near to the ram) and DC-133 card is in 3. slot (near to the ISA). Until now I use a 8GB IDE harddisk but this I will change soon against an SSD via an IDE adapter Dietmar EDIT: The jumper for RAID I put away from the DC-133 card. The jumper for Bios Rom I set.

I tested about 20 different PCI to IDE/Sata cards with own Bios Rom. I flash a lot with EEProm writer. Always after this procedure I can see the connected HD or CD-Rom drive or both at boot time. But I never succeed with booting XP SP3 via any of this cards on the Shuttle Hot 433 board with 486 cpu. Also I cant install XP SP3 via any of this cards. Before I have to hit F8, I always get Bsod 0x7B, even the driver for this harddisk is to 100% correct and there. So I start to think, that the Bios of this board is faulty as much as possible or it is even impossible to boot via any of the PCI slots of this board. Only the own 2 integrated IDE slots work and the Floppy connector Dietmar

@Damnation May be, that IDE works, but I need for XP the boot Rom. Just now I order from ebay a card Dawicontrol DC-150, which has an own Bios Rom. https://www.ebay.de/itm/404890659301 On next weekend I make also a try with flashing another Bios to the Shuttle Hot 433 board, because my intuition tells me, that it is not normal that ALL PCI cards fail Dietmar EDIT: I found the driver together with the Bios for this card. nr for the NON-Raid version. Because in description they wrote, that driver and Bios from this card have to match. With my EEprom writer TL866 II plus it is easy for this Bios chip. dc150_nr.zip https://ufile.io/v3omq3sk

@Damnation I tested this card only for to boot XP SP3 on this 486 board Shuttle Hot 433, and there also no IDE Dietmar

@Damnation I have this card. No Rom, no boot message, just nothing on the Shuttle Hot 433 board for 486 cpu Dietmar PS: May be this happens, because no Bios Sata driver is integrated in the Bios from that Shuttle board.

@Damnation Thanks for help, but I think, those cards to not have a boot Rom Dietmar

@roytam1 The PCI to IDE/Sata adapter cards have own Rom. But it seems, that there is a conflict between the Bios of the Shuttle Hot 433 board and the Rom of those cards. Is here somebody on the forum, who gets an PCI to IDE/Sata card work on a 486 board and can boot via the Rom of this card for example to win2000, win98SE, win95, NT4 Dietmar

@ProgramHacker This will not work Dietmar

@roytam1 I want to do this, but for those a lot of cmpxchg8b there, it is just not enough free place in it at the end of their .text section. And I have small success with to enlarge the .text section. Can you enlarge the .text section of my german files? And write me, where those free place is now in those files. Then I will do the modd Dietmar

@roytam1 This problem I have had before. Now I always look, if still the modified ntoskrnl.exe is at its place. I think, that the same happens to you. In the very last reboot, some files are changed back to their original one. Because I do not change them in sp3.cab or dll or driver folder. For to overcome this, I just put out HD before last reboot and copy by hand back all the modded files. This works for me. Until now I do not succeed to install any PCI to Sata or IDE controller under XP. With the original PIO 3 IDE controller on the Shuttle Hot 433 board, the transfer speed is about 7MByte/s, brrr.. I tried really all. No driver is even correct installed under running XP. I tried: Promise TX2 300, Silicon 3114, Silicon 3112 and a no name from China. "Best" result shows the Promise driver, but even when XP tells, that its driver is correct installed, I never see a harddisk via this adapter, nor I can boot from it Dietmar

@roytam1 Do you have success with installing your modded english XP SP3 on a 486 cpu? Which version do you use? Do you change anything compared with my files? I am soso curious, can you send me your modded files? Just now I am installing my german xp486.iso direct onto an AMD 133MHZ 486 cpu Dietmar

Hi, is there a tool or an adapter, where you can put your xp.iso on it, so that it looks like a real CD-Rom? Connector to compi can be IDE or Sata or PCI. No USB connector, because old motherboards know nothing about USB. I ask this, because I notice, that some of my burned CD-Roms do not work any longer, because of age(?) Dietmar

@roytam1 I think, that you miss a 90 at the end of this Dietmar Comparing files WINNT32U.DLL and ..\ENG-HACK\WINNT32U.DLL 000323CC: 75 EB 0003739E: 0F 90 0003739F: 84 90 000373A0: 43 90 000373A1: 07 90 000373A2: 00 90 000373A3: 00 90 000373AE: 0F 90 000373AF: 84 90 000373B0: 33 90 000373B1: 07 90 000373B2: 00 90 <==

@roytam1 Have you tested with the modded WINNT32A.DLL and WINNT32U.DLL, if the hack in ntoskrnl.exe against Bug Check 0x5D UNSUPPORTED_PROCESSOR is not necessary any longer Dietmar

@roytam1 With my XP TXTSETUP runs ok. But then, after first reboot, compi hangs after about 4 min. Sometimes hanging after about 4 min and sometimes during detect of devices (37min to wait is shown). Are WINNT32A.DLL and WINNT32U.DLL on the german CD the same as on English ones? Please tell me the crack or send me the already modded files Dietmar

Yessssaaa, it installs XP SP3 on my AMD 486 133MHZ cpu !!!!!!!!!!!!!!!!!!!!!!!!! Even I do not get any Bsod before, I did exact the same extras as you: Extra setupldr.bin patch 75 to EB in 0x23513 (strange, because it has CPUID), and replacing NTKRNLMP.EXE with our hacked NTOSKRNL.EXE, niccccccccccccccccccccceee.. And I also delete logagent.exe and wmnetmgr.dll from the XP SP3 install CD, because those 2 are the only files left, with CMPXCHG8b opcode in it Dietmar

@roytam1 I am just testing on Shuttle Hot 433 board with AMD 133 MHZ486 cpu AMD AM5x86-P75 Dietmar EDIT: On real 486 compi, the same reboot happens before the F8 appears. Is there something other, that you change on my "Source" CD for setup of german XP SP3 with all those modded files?

@roytam1 I replace the second ntdll.dll with my modded one but get the same reboot just at the end of the Setup process, before you have to hit F8. Please, can you tell me, what simulator you use for the AMD 486 cpu. And is there a possibility, even in this very first Setup of XP to let Windbg watch it, may be via a crash debug log Dietmar

@roytam1 With this changes, can you install XP SP3 now on a 486 cpu Dietmar