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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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Date:	Fri, 03 Feb 2006 02:22:35 GMT
To:	djgpp AT delorie DOT com
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Reply-To:	djgpp AT delorie DOT com

"Rod Pemberton" <dont_have AT bitbucket DOT cmm> wrote in message
news:1o8ab3-2i71 DOT ln1 AT news DOT infowest DOT com...
>
> "Brad House" <brad AT mainstreetsoftworks DOT com> wrote in message
> news:43E243F8 DOT 7060401 AT mainstreetsoftworks DOT com...

> > 2) With PMODETSR the program seems to terminate totally instead
> >     of becoming a TSR.  DOS is still fully functional, just my
> >     program seems to go away.
>
> I'll try that first.  Likely indicates a programming error of some sort.

Yes. It failed.  So I decided to check the RM interrupt addresses to see if
they were being hooked, i.e., did they change?  And, lo and behold, for both
the working CWSDPMI and 'failed' PMODETSR, _neither_ had changed the RM
interrupt addresses.  Hmm, okay, did you setup PM interrupts?  Yup.  You've
setup PM interrupts.  For DJGPP, the only interrupts available in PM are the
DPMI spec and any interrupt that gets reflected to PM by the DPMI host,
i.e., int 0x08 etc.  Apparently, PMODETSR doesn't reflect int 0x08 from RM
to PM, so it appears to not work.  There is no int 0x28 in PM, which is why
your int 0x28 routine isn't being called.  For OpenWATCOM, you'll also have
any of the DosExtender interrupts available.   I think you'll probably want
to rewrite the code to trap the RM interrupt and reflect it to PM using a
realmode callback...


Good luck and keep in touch,

Rod Pemberton

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