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Path: utzoo!linus!philabs!cmcl2!floyd!whuxle!jph
From: jph@whuxle.UUCP
Newsgroups: net.micro.pc
Subject: Re: Question about DOS int 21 - (nf)
Message-ID: <197@whuxle.UUCP>
Date: Tue, 20-Dec-83 21:39:40 EST
Article-I.D.: whuxle.197
Posted: Tue Dec 20 21:39:40 1983
Date-Received: Thu, 22-Dec-83 01:03:56 EST
Sender: jph@whuxle.UUCP
Organization: Bell Labs, Whippany
Lines: 9

#R:shell:-15400:whuxle:22700010:000:265
whuxle!jph    Dec 20 21:39:00 1983

INT 21H has its own local stack that is switched to when it
is called (since you never know how large the caller's stack
is). Therefore if you invoke INT 21H without first returning
(i.e., recursively) you mess up the internal stack and can
never return correctly.