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From: Jim Michaels <jmichae3 AT yahoo DOT com>
Newsgroups: comp.os.msdos.djgpp
Subject: Re: djgpp compiler and tools, execution of apps on 64-bit windows
Date: Thu, 13 May 2010 17:32:04 -0700 (PDT)
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To: djgpp AT delorie DOT com
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Reply-To: djgpp AT delorie DOT com

On May 12, 5:27=A0pm, Jim Michaels <jmich DOT  DOT  DOT  AT yahoo DOT com> wrote:
> On May 12, 3:36=A0pm, Jim Michaels <jmich DOT  DOT  DOT  AT yahoo DOT com> wrote:
>
>
>
> > On May 11, 10:05=A0pm, "Charles Sandmann" <cwsd DOT  DOT  DOT  AT earthlink DOT net> wrote=
:
>
> > > "Jim Michaels" <jmich DOT  DOT  DOT  AT yahoo DOT com> wrote in message
>
> > >news:d9cc89d0-2aba-440e-9aad-50d9c1f57709 AT p5g2000pri DOT googlegroups DOT com.=
..
>
> > > > on, say, 64-bit windows 7, can you execute 32-bit CWSDPMI DOS apps
> > > > compiled with DJGPP in a CMD.exe shell?
> > > > can you execute the DJGPP toolset in a CMD.exe shell?
>
> > > No to both. =A0DJGPP images appear as DOS 16-bit images to
> > > Windows (the stub is 16-bit DOS). =A016-bit programs cannot
> > > run under a 64-bit mode unless they are done in emulation.
> > > Emulation products will run DJGPP images, but more
> > > slowly.
>
> > > > what about 32-bit windows 7?
>
> > > Should be fine, but 32-bit Win7 is also hard to find.
>
> > > > I was going to utilize this information to base my purchase decisio=
n
> > > > on a new computer.
>
> > > If the computer has 3GB of memory or less, the 32-bit version
> > > makes more sense for lots of reasons. =A0If the computer has more
> > > than 3GB of memory, you will probably only get to use 3GB
> > > or maybe 3.5GB of it under 32-bit Windows. =A0There are tools
> > > that allow you to use the unused memory for other things like
> > > a RAM disk.
>
> > > > should I just stay with venerable old XP 32-bit?
>
> > > It is more compatible with DJGPP images and lots of
> > > software out there, but is hard to find. =A0Microcenter
> > > currently has a reasonable new dual core XP-Pro Dell
> > > system for $399 if you want to stick with previous
> > > generation software. =A0It comes with upgrade rights to
> > > Win 7 Pro if you decide to upgrade.
>
> > actually I was looking at a high end 4 or 6-core box since it was 2004
> > since I bought a computer (6 years). =A0I was thinking of an intel
> > processor. i7 980x w 9GB RAM or yorktown HP w 8GB RAM and then
> > installing XP SP3 Retail or, if windows 7 retail would work, windows 7
> > retail.
> > but then I have a drivers problem if I retro xp - drivers may not be
> > available for xp on the hp web site!http://www.forumcraze.com/forums/ap=
plications/34440-microsoft-windows...
>
> > what about the retail version of windows 7? =A0it always treats intel
> > procs as 32-bit doesn't it? =A0or does it?
> > I guess from this picture (correct me if I am wrong) the retail
> > version treats all intel procs like 32-bit procs.
>
> > can I set up an emulation product like freedos which has drive/
> > partition access to the rest of the system if I make another FAT32
> > filesystem? =A0Freedos uses a variation of FAT32.
>
> I may do a custom computer with windows 7 32-bit. computer stores can
> custom build me a computer with windows 7 32-bit and 32-bit has
> command.com.

I did more research I and I heard some rumblings about windows 7's
"Windows XP Mode".
it turns out it's a Windows Virtual PC that emulates XP yet provides
access to your devices.  I don't know what kind of filesystem access
it provides.
http://www.microsoft.com/windows/virtual-pc/support/faq.aspx
http://www.microsoft.com/windows/virtual-pc/
and, it's 32-bit always.  so I think i'm covered if I get a 64-bit 7
box.

the only issues left are the filesystem virtual store.  if anything
ever touches c:\program files\ and it doesn't have a manifest, or
something is trying to write data there, the app gets shuffled off to
the virtual store area.  this has been happening since vista.