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From:	"Rod Pemberton" <dont_have AT bitbucket DOT cmm>
Newsgroups:	comp.os.msdos.djgpp
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Subject:	Re: TSR issues (with code)
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NNTP-Posting-Date:	Thu, 02 Feb 2006 08:59:36 UTC
Date:	Thu, 02 Feb 2006 09:02:35 GMT
To:	djgpp AT delorie DOT com
DJ-Gateway:	from newsgroup comp.os.msdos.djgpp
Reply-To:	djgpp AT delorie DOT com

"Brad House" <brad AT mainstreetsoftworks DOT com> wrote in message
news:43E1863D DOT 8080308 AT mainstreetsoftworks DOT com...
> Thanks for replying (and testing)!
> I've actually not yet tested any DPMI other than cwsdpmi (I was
> assuming it was me, totally).  On your tests, I assume the Win98
> DosBox test used the Windows DPMI env, and the RM MS-DOS 7.10
> used cwsdpmi?

Yes, and yes.  DJGPP checks for a compatible installed DPMI host first
(Win98SE) before starting up CWSDPMI etc.  (i.e., OpenWATCOM hosts won't
work.)

> One other thought.  I'm using DJGPP 2.04 beta with gcc 3.4.4 and
> binutils-2.16.1.  What versions are you running?  If you're running
> something other than that, could you send me the testtsr.exe that you
> generated so I can verify if maybe it's my development environment?

I'm running DJGPP 2.03 with (DJGPP versions of) gcc 3.4.1, binutils 2.15
(plus older versions overinstalled...)

Are the versions you're running the most current?  I thought gcc was upto
4.0.2 or 4.0.3 perhaps?

2.04 beta? Where is the beta? on www.delorie.com?  I've seen a couple people
mention it and asked DJ, but he didn't point me in the correct direction.  I
looked there but didn't see it...(Yes, I know I can be blind.)

Getting the exe to you may be a problem.  How are you expecting the exe to
get to you?

I don't have true email, at the moment and I am not planning on correcting
that issue soon.  I prefer ftp/http.
I can outbound email to open newservers, send outbound email to email
servers which don't confirm my PC's server identity, i.e., spam-able, (DJ
email relay blocks), anonymous ftp, http-put(?), telnet(rz-sz), xx/uuencode
and post...  I think Winzip/PKZIP, perhaps 7-zip, now handle xx/uuencode.

> Oh, and, I really don't plan on using WatcomC, we were just doing some
> testing to see if that would be a feasible option if all else fails,
> but I think we'd like to stick with DJGPP and GCC if at all possible
> (besides DOS/4GW doesn't support protected mode TSRs, so we'd have
> to see if DOS/4G is still out there).

DOS/4G and CWSDPMI, PMODEDJ(pmodetsr) don't support them either.  In fact, I
haven't found any DPMI host for any platform which supports the DPMI 1.0 TSR
calls, that includes all the DPMI 1.0 hosts.

Yes, DOS/4GW, PMODEW, and others come with OW.  Most of the OW crowd have
switched to Devore's Causeway, Kumar's DOS/32A (not to be confused
w/DOS32/A),  and Japheth's HXRT.  I continue to use DOS/4G and PMODEW...  I
think PMODEW is faster than DOS/32A.  As for DOS/4G, except for one bug, it
is very reliable.  Most of the more advanced calls can be implement with the
simple subset in DOS/4G, but people don't seem to know/care/spend the time.

> Are there any suggestions you can make if all else fails? My DOS 6.22
> environment is pretty much a fresh install, I think the only thing

1) beta DJGPP 2) memory 3) DPMI host 3) DOS issue 4) ????

My first thought is to back out beta DJGPP since it is new.  However,
testing memory, changing the DPMI host, and switches DOS versions are
probably much easier.

Reentrancy can be an issue.  DJGPP uses about 170 DOS, BIOS, DPMI calls.  OW
1.3 uses about 100.  I don't know about OpenWatcom 1.4.  I've been intending
to download it, but I suspect not much has been done for DOS.

I've written a couple of DJGPP TSR's.  They all work well, except int 0x21.
When it comes to int 0x21, everything works except one interrupt call.  They
lockup on DOS exec, int 0x31, ah=4b00.  I don't know how to workaround that
issue.  Hopefully, it is something I forgot or implemented incorrectly with
reentrancy or locking...  perhaps PSP, perhaps not saving/restoring the
SDA... I don't know.  I found it easier to just write DOS TSR's in NASM, so
I haven't returned to the issue.

I boot into DOS clean, and use different batch files for OW, DJGPP, etc.  I
use a less popular device driver loader, P. Frost's DDL, to get the drivers
loaded after I'm at the command prompt.  The Freedos crowd uses something
similar (asleep, don't recall).


Rod Pemberton

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