dudulinek wrote on 2021-02-16, 16:04:

Machine Pentium 233MMX 64MB RAM motherboard PC Chips M537 DMA S3 Virge DX 4MB + Voodoo 2 12MB SoundBlaster Live SB0220 Delock ID […]
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Machine
Pentium 233MMX
64MB RAM
motherboard PC Chips M537 DMA
S3 Virge DX 4MB + Voodoo 2 12MB
SoundBlaster Live SB0220
Delock IDE>CF adapter + 16GB card
Gotek FDD emulator

Let me explain what iam doing:
1 - installed MS DOS 6.22
2 - installed all drivers, added some "must have" things config.sys and autoexec.bat
3 - EVERYTHING work perfect ... super DOS Gaming PC ... duke nukem 3D, Doom, Transport Tycoon, Monkey island ... general midi ok, MT32 emulation ok ...
now i want also windows 95
4 - installed windows 95
5 - W95 work fine
now i want switch to DOS 6.22
6 - from boot menu "F8" select Previos version MS DOS
7 - DOS 6.22 start OK
and now
8 - after ctrl+alt+del from DOS i want back to W95. PC not booting ... no DOS, no windows it just stop after post screen

why it happen?

You may be hitting a variant of the scenario described here : http://www.mdgx.com/osr2.htm#2BOOT

As for recovery, you may be able to just boot with a DOS 7.0 bootable diskette (or the recovery disk that Windows 95 offered to create during installation) and, if the CF card is accessible, run
a) fdisk /mbr
b) sys a: c:
c) try to reboot from the CF card and hope for the best .
I don't know if this might "break" the boot from previous OS (DOS 6.22) functionality .

Once you get back to a working state, I also strongly suggest you backup your CF card using something like Clonezilla or Acronis TrueImage . This can save a lot of time and frustration .

That being said, I have always believed that using the "Previous version of MS-DOS" option in Windows 9x is not a good idea .
IMHO, it is of nearly no practical value and just adds one more potential point of failure to a given setup. There is practically nothing useful that DOS 7.x (bundled with Windows 9.x) cannot do just as well as 6.22 . See Re: DOS 6.22 and Windows 98 SE Multi Install

If you absolutely want DOS 6.22 for nostalgia reasons (perfectly valid reason, IMHO), I suggest that you use a separate CF card for it . This would
a) Avoid the issue you currently have
b) Not limit you to 2GB partitions and 8GB max disk availability on the Windows 95 side of things (assuming your version of Windows support FAT32)

yup iam using acronis true image for backups it working great.
tried everything ... also older windows 95 version ... result is ... solo DOS OK, solo windows 95 OK when i combine both systems, pc stop boot. Tried also standard HDD so compact flash is not problem. Will buy one more CF card for W95 ... question is for what i need W95 😁 I think i will keep P233 for DOS only. For W98 already have P4 2.4 + 1GB RAM + FX5500 256MB and also SB Live. For XP built Q9550, 4GB RAM and GTX760 2GB it working fantastic!

Thank you for help m8

dudulinek wrote on 2021-02-16, 22:30:

yup iam using acronis true image for backups it working great.
tried everything ... also older windows 95 version ... result is ... solo DOS OK, solo windows 95 OK when i combine both systems, pc stop boot. Tried also standard HDD so compact flash is not problem. Will buy one more CF card for W95 ... question is for what i need W95 😁 I think i will keep P233 for DOS only. For W98 already have P4 2.4 + 1GB RAM + FX5500 256MB and also SB Live. For XP built Q9550, 4GB RAM and GTX760 2GB it working fantastic!

Thank you for help m8

Glad to read that you have backups . I would have gone crazy (or crazier 😉 ) a long time ago without those .

That sound like a plan . The only possible nitpicks I have are

a) that a 233MHz Pentium MMX may not be enough to max out some of the more demanding late DOS games (Duke Nukem 3D, Blood, Quake) if you you want to run them at 640x480 or above . Luckily, those should work fine on your P4 for the most part .
b) some DOS games might only work with an ISA SB compatible sound card (and IMHO the SB Live's OPL3 emulation is not exactly my favorite), but if you don't plan on playing any of those, that is not an issue .
c) Windows 98 SE needs to be patched to be stable with more than 512MB or RAM . No biggie, just something to keep in mind .

Cheers and have fun!

Dont have any patch Win 98 work fine. installed from my old original disc 😀
Here is some games test. Working now on windows XP video 😀

1https://www.youtube.com/watch?v=BJtw9Ah0yoQ

On my P233 duke and blood runing fine 640x480 is absolut smooth ... Iam trying now complete Pentium 3 450 + Voodoo 3 2000 but there is something wrong with performance. Windows games like need for speed 3, Croc 2, Quake 2 runing 15 FPS and also DOS games are very bad when i start Duke3D in windows is near unplayable and very laggy 🙁 Dont know whats wrong maybe bought brokeen hardware 🙁