From:	clc5q AT cobra DOT cs DOT Virginia DOT EDU (Clark L. Coleman)
Newsgroups:	comp.os.msdos.djgpp
Subject:	DOS Protected Mode Services under Windows XP
Date:	22 Jun 2002 15:53:21 GMT
Organization:	University of Virginia Computer Science Department
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To:	djgpp AT delorie DOT com
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Reply-To:	djgpp AT delorie DOT com

I have laptop with multiple OS installations, including Windows XP and
DR-DOS. I have installed the Windows XP updates for DJGPP 2.03.

When I run go32-v2, it tells me I have 136MB of DPMI memory available,
but 0KB of swap space. (The laptop has 256 MB of DRAM). gcc 2.95.3 is
failing to compile a very large function in one of my C source files
(it will produce a few hundred KB of object code in a single
function.) The failure is silent; make shows that the compilation is
occurring, then it simply stops and does not continue any further in
the makefile, with no messages.

So, I thought I probably need to do something about the 0 swap
space. Searching my Windows XP directories produces no hits for
EMM386.EXE; the Help utility has no hits for "DPMI" or "DPMS",
etc. The C:\CONFIG.SYS and C:\AUTOEXEC.BAT files are empty.

So, I edited the C:\CONFIG.SYS file to include the EMM386.EXE file
from my DR-DOS partition:

DEVICE=E:\DRDOS\EMM386.EXE MULTI DPMI=ON FRAME=AUTO
DEVICE=E:\DRDOS\DPMS.EXE

This is how I use DPMI services on DR-DOS, but it makes no difference
in the DOS box under Windows XP.

Does anyone else have any swap space available under Windows XP? If
so, how? Or, is swap space irrelevant? My Windows NT desktop has no
swap space either, but it compiles this file just fine. It has 224MB
of RAM and go32-v2 shows 171MB of DPMI memory available, while my
laptop has 256MB of RAM and only 136MB of DPMI memory. Is that the key?

Does Windows XP provide DPMI services to the DOS box without my
knowing it?

Thanks for any help.

Clark Coleman

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