Mail Archives: djgpp/2005/10/06/20:15:40

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From: Rod Pemberton <donthave AT noreply DOT bit>
Newsgroups: comp.os.msdos.djgpp
Subject: Re: Need to hook INT 21h from a DJGPP TSR
Date: Fri, 7 Oct 2005 00:04:20 +0000 (UTC)
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Message-ID: <di4e24$no2$>
References: <cone DOT 1128591471 DOT 368325 DOT 13774 DOT 0 AT digisoft> <di47pc$lfa$1 AT sadr DOT dfn DOT de> <200510062313 DOT j96NDPXb004112 AT envy DOT delorie DOT com>
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To: djgpp AT delorie DOT com
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Reply-To: djgpp AT delorie DOT com

Sigh, yes, I am very familiar.

C. Sandman's kit was my first exposure to TSR Programming under
DOS.  That's also why I know about the problems I listed.  That,
and (ancient) conversations with you, C. Sandman, M. Necasek, M.
Devore, and just about every other DOS and DPMI "expert" who was
willing to reply.

I spent months trying to get that kit to do something very similar
to what he wanted with no luck.  I have a directory full of about
21 TSRs with numerous amounts of unworking code.  I eventually
learned many of the problems stemmed from the limited _go_32
functions and there incompatibility with the _dpmi functions.  So I
switched to straight _dpmi calls which worked better, and still had
the problems I mentioned.  And, over the past five years,  I've
gotten much better DOS and w/DPMI but I don't think any of those
problems will be easy for him to fix especially if he doesn't know
assembly.  I eventually found it was much easier to learn Intel
assembly than to get PM TSR's to work.

I wish him luck, because from my experiences, he will need it.


Rod Pemberton
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