Path: utzoo!utgpu!news-server.csri.toronto.edu!bonnie.concordia.ca!uunet!munnari.oz.au!csource!david
From: david@csource.oz.au (david nugent)
Newsgroups: comp.os.msdos.programmer
Subject: Re: TSR's - Must they be converted to .COM?
Keywords: TSR
Message-ID: <1014@csource.oz.au>
Date: 17 Feb 91 05:09:45 GMT
References: <3188@unccvax.uncc.edu> <24314@netcom.COM>
Organization: Unique Computing Pty Ltd, Melb, Aust.
Lines: 21

In <24314@netcom.COM> resnicks@netcom.COM (Steve Resnick) writes:

> Making an EXE TSR is a little more complicated, in that you need to know
> where the code segment is relative to the PSP, and how  many paragraphs the 
> TSR is going to take when you make the DOS call. I don't think the INT 27H
> TSR interrupt will work for this, but rather DOS function 31H will do the TSR
> in this "style'


INT 27H will still work alright, provided you have CS set to the program's
PSP.  That's often a little hard to arrange in a .EXE format, but it's
nevertheless possible.  With an easier alternative around, it's no wonder
that that sort of contortion is rarely, if ever, seen.


	david

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