Article View: comp.os.msdos.programmer
Article #4142Re: Backgroup processing (Was Re: DOS idle interrupt (INT28))
From: david nugent
Date: Sun, 06 Jan 1991 02:08
Date: Sun, 06 Jan 1991 02:08
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1341 bytes
In <5188@trantor.harris-atd.com> sonny@charybdis.harris-atd.com (Bob Davis) writes: > >Also, the PIC is rearmed by the time INT 1cH gets control, so you don't > >have to fiddle around with EOI's at all. It's an "ideal" place to pop-up. > Are you sure that the PIC is rearmed? Whoops, did I say that? :-) You're quite right. The "correct" thing to do is to call the original INT 1cH handler, rarm the PIC with a specific EOI and enable interrupts. I actually found it was rearmed in some situations and others not. This is probably a function of BIOS versions, DOS versions and/or prior INT 1cH handlers. But I've never found a situation in which there's a problem with doing another specific EOI just in case. david
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Path: arc1-ca.pugleaf.net!utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!uunet!munnari.oz.au!csource!david From: david@csource.oz.au (david nugent) Newsgroups: comp.os.msdos.programmer Subject: Re: Backgroup processing (Was Re: DOS idle interrupt (INT28)) Message-ID: <774@csource.oz.au> Date: 6 Jan 91 02:08:03 GMT References: <5094@trantor.harris-atd.com> <1537@netmbx.UUCP> <1990Dec19.050307.16450@engin.umich.edu> <1991Jan5.043055.17637@bronze.ucs.indiana.edu> <773@csource.oz.au> <5188@trantor.harris-atd.com> Distribution: comp Organization: Unique Computing Pty Ltd, Melb, Aust. Lines: 18