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How to dual boot OSR2 & MS-DOS

Posted on 1997-10-31
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Last Modified: 2013-12-16
I got an OSR2 recently and I install it on a ms-dos machine.  It seems everything works fine.  Until I try to boot to ms-dos by pressing PF4 when the system starting up.  MS-DOS did start up, but when I restart it again, OSR2 cannot start again.  It doesnt even prompt the "starting windows 95..." msg.  I check and find the io.sys, msdos.sys doesnt switch properly.

So I guess if the the dual-boot support is changed in OSR2?
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Question by:dbrian
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johnt082197 earned 200 total points
ID: 1751378
No, it doesn't. But you fell upon a little switching problem once, and that's messed up now.
In your root directory on C: drive, you should have those files (plus more):
MSDOS.SYS
MSDOS.W40
IO.SYS
IO.W40
AUTOEXEC.BAT
AUTOEXEC.W40
COMMAND.COM
COMMAND.W40
CONFIG.SYS
CONFIG.W40

That's when you boot in DOS mode. If you have files with a .DOS extension, something's wrong. So here's how to fix it.
check out the MSDOS.DOS file. If it's readable text, it's wrong, delete *.DOS  Reboot and everything should be alright.
If you don't have *.DOS _and_ *.W40, then I dunno what's wrong
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Author Comment

by:dbrian
ID: 1751379
Johnt,

Actually, I know the file switching mechanism of the dual boot between win95 and dos.  However, when i finished setup my win95 on a msdos installed hard disk, I boot win95 fine.  Then I boot dos again.  It's fine also, but only once.  Then win95 cannot be up again until I boot with a win95 startup disk and rewrite the system file by "sys c:" command.  The win95 is alive again. But dos can never be start again.

Quite a few of my friends have this problem too.  So I want to know if it this a bug or it's not supported any more.

Did you ever try this before?  I mean boot between dos and OSR2  again and again.
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Expert Comment

by:johnt082197
ID: 1751380
Well... I did give up on Win 95, and that was one of the reasons. I have Win NT now, and it's much better. But I'll ask about OSR2 and dual boot. I think there shouldn't be any problem with this.

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Expert Comment

by:johnt082197
ID: 1751381
I asked a friend of mine who was using dual boot and OSR2. It worked just fine. All I can say is for you to make sure all those files up there are in the root, and that you don't have files with a .DOS extension when booting in DOS. Nor should you have any .W40 extension files when booting Windows 95
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Expert Comment

by:scott4
ID: 1751382
You can run a run program called FIX-95B.COM
It can solve this problem easily.
Send email to me if you want this file.
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Author Comment

by:dbrian
ID: 1751383
Scott4,

I need the file.  Pls e-mail to me at dengxh@raleigh.ibm.com.  Thx a lot.
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