Xref:	news-dnh.mv.net comp.os.msdos.djgpp:4443
From:	aew950 AT leonard DOT anu DOT edu DOT au (Anthony Edward Wesley)
Newsgroups:	comp.os.msdos.djgpp
Subject:	\windows\emm386 broken, \dos\emm386 works
Date:	15 Jan 1996 18:39:39 +1100
Organization:	Australian National University
Lines:	45
Message-ID:	<4dd0br$6mg@leonard.anu.edu.au>
NNTP-Posting-Host:	150.203.2.15
To:	djgpp AT delorie DOT com
DJ-Gateway:	from newsgroup comp.os.msdos.djgpp

I have just downloaded & installed djgpp 1.12 (gcc2.6.3) and had some 
strange things happen which took a while to find and sort out. Apologies 
to the group if I am going over well-known territory, but my problem (and 
its solution) was not mentioned in the FAQ, so here goes...

My environment:

486dx2/66, 12Mb RAM, Linux, Windows95, DOS 6.2 / Win 3.1 (bootable off 
second disk)


Summary:

djgpp worked great under Win95 and from the dos box in Win 3.1, but ran 
_excrutiatingly slowly_ under dos 6.2. Eventually I discovered that using 
the \dos\emm386.exe instead of \windows\emm386.exe solved the problem.

How I solved it:

I used "topline" (nice feature...) and saw my free memory plummet from 
10Mb -> 256k as soon as I started a compile. This behaviour did not 
happen under DPMI, explaining why djgpp ran fine in Windows 95 / 3.1.

I guessed that it was a nasty XMS interaction and blamed emm386.exe. 
Since I had another copy lying around I tried it out of interest, and the 
rest is, as they say, history...

I didn't realise that it was a paging problem for a while, since my hDD 
light doesn't work :-)

If someone could explain this to me I would be interested. My setup, and 
the steps I went through during installation of djdpp, are not 
exceptional. I have been using djgpp on and off for several years and am 
reasonably familiar with how it hangs together (I even wrote a GRX driver 
for my video card a while back..)

Anyway, it works fine now under all the DOS based environments I have 
available.

 Perhaps this is worthy of a paragraph in the FAQ ?

cheers, anthony

awesley AT galaxy DOT anutech DOT com DOT au

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