Re: Vertical Retrace interrupt?

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#549

From: Khan
Date: Mon, 10 Aug 1992 13:49

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In article <1992Aug8.100417.7375@zooid.guild.org> Ross Ridge <ross@zooid.guild.org> writes:
>
>This is true of any type of card, no two devices on the ISA bus can
>generate the same IRQ.

Really? Then why can my COM1:, which is on the motherboard, coexist with
my COM3:, which is on a separate modem card? Both generate IRQ4.

>The problem is electrical, because of the way the ISA bus is designed
>you risk serious damage if two devices on the bus share the same interrupt.

What's your source for this?

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References: <1992Aug8.100417.7375@zooid.guild.org> <1992Aug6.154949.164290@dstos3.dsto.gov.au> <BsJx5H.FKy@watserv1.uwaterloo.ca>

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Newsgroups: rec.games.programmer
Path: arc1-ca.pugleaf.net!sparky!uunet!usc!sdd.hp.com!ux1.cso.uiuc.edu!news.cso.uiuc.edu!usenet
From: tmkk@uiuc.edu (Khan)
Subject: Re: Vertical Retrace interrupt?
References: <1992Aug8.100417.7375@zooid.guild.org> <1992Aug6.154949.164290@dstos3.dsto.gov.au> <BsJx5H.FKy@watserv1.uwaterloo.ca>
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Organization: University of Illinois at Urbana
Date: Mon, 10 Aug 1992 13:49:17 GMT
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