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From: jerry@jvdsys.nextjk.stuyts.nl (Jerry van Dijk)
Subject: Re: IRQs and interrupt handlers
Date: 1998/05/24
Message-ID: <EtFppu.4o@jvdsys.nextjk.stuyts.nl>#1/1
X-Deja-AN: 356002651
References: <MJA81.136$ja.1698536@newsread.com>
 <356307C7.D18D062@cl.cam.ac.uk> <6k1rq4$58t@top.mitre.org>
 <1998May21.173539.1@eisner> <3565976A.D1B53EA9@catalina-inter.net>
 <35662efc.38593625@SantaClara01.news.InterNex.Net>
Organization: * JerryWare *, Leiden, Holland
Newsgroups: comp.lang.ada
Date: 1998-05-24T00:00:00+00:00
List-Id: <comp.lang.ada>


Tom Moran (tmoran@bix.com) wrote:

: Why can't he make an ISR with Gnat?  Is it missing machine operations?
: Can't he link to MASM code?  I have an old DOS program that does its
: own com port interrupts that runs in a DOS box under Win95 (much of
: the time).  Reliability and interrupt latency of course may be a
: problem...

Yes, but you are talking _DOS_ code now, running under WinXX, not
Windows code.

Reliability is always an issue in such cases, since it will require
both a 32-bit protected mode _and_ a 16-bit real mode handler to
circumvent the interrupt deflection problem.

Jerry.

-- 
-- Jerry van Dijk  | email: jdijk@acm.org
-- Leiden, Holland | member Team-Ada