ages2001

I already tried that for XP32/64 with NVMe disk and UEFI boot. And it worked. It seems Vista SP1 32-bit partmgr.sys and disk.sys should be backported for Win2000. XP32 ones has 2 TB limit and can corrupt data above 1 TB written. Buıt Vista SP1 32-bit ones don't have 2 TB limit and no corruption (not 100% sure but I didn't hear any corruption from anyone).

Do you have exact same installation ISO? I think mine is different.

@Cixert did you try files with Win2000 with Extended Core and Kernel? It works with NVMe GPT disk connected with PCIe adapter (when booting from another IDE MBR SSD). It can see partitions but they don't have drive letter. But I cannot boot from NVMe GPT disk, it gives 0x7B BSOD. Srv2003 disk.sys and partmgr.sys also give 0x7B BSOD. XP 32 bit and 64 bit boot from NVMe GPT disk normally with their own disk.sys and partmgr.sys (of course 32-bit is from srv2003). Note: IDE SSD and NVMe SSD are smaller than 2 TB.

I managed to boot Windows 2000 with Clover UEFI32 and Longhorn 5472 boot files on real hardware. Only problem is, no screen. But sound and disk activity exist and heard Windows sounds. Even GTX980 driver does not display (both in legacy and UEFI boot with longhorn files. But displays normally with ntldr). This problem does not happen in XP. It displays correctly. @reboot12 @Dietmar maybe you guys can solve with patches. For NT4, it wants kdcom.dll and bootvid.dll. If these files bypassed or patched, it can boot with UEFI. EDIT: Display worked when I switched DP to HDMI for win2000! For NT4, I managed to bypass kdcom.dll but this time, 0xc000007b bootmgr kernel error (not BSOD). Maybe it requires ACPI or bootmgr should look non-ACPI hal. EDIT 2: Tested also with QEMU and it worked. Video: https://youtu.be/NLW0Eg1nDNU

Hi, everyone! I'm trying to install Windows Vista on Acer Travelmate P215-52G laptop (from 2020 era). It has Comet Lake chipset, i5-10210U CPU, Intel UHD Graphics iGPU, Nvidia MX230 GPU and 2x8 GB DDR4 RAM. I tried modded ACPI.SYS files for Windows XP and 7 but none of them worked. WinXP ones gave 0x000000A5 ACPI BSOD. Win7 ones gave 0xc00000098 boot error. Also tried HEX editing 84 C0 75 1F to 84 C0 90 90 and 85 C0 78 2E to 85 C0 90 90 but gave 0x000000A5 ACPI BSOD. Can anyone help me or have correct modded acpi.sys for vista x64? Thanks from now!

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@reboot12 @Dietmar problem solved with newest csmwrap.efi! Even if GPU does not support Legacy OPROM! Now I'll test some OSes. Windows 1.0 worked already but slow.

Btw, CSMWrap has VGA issues. I cannot get any GUI before Win7. Windows 1.0, 2.0 only writes text welcome screen and freezes. Win3.1 refuses to boot because of HIMEM.SYS (I added it in CONFIG.SYS but no luck). Also DOS refuses HIGH, only LOW accepts. For winXP, ntldr cannot manage to display. So, the main problem is VGA. My laptop iGPU does not have legacy OPROM.