From owner-freebsd-hardware Fri Jul 19 06:43:22 1996 Return-Path: owner-hardware Received: (from root@localhost) by freefall.freebsd.org (8.7.5/8.7.3) id GAA26421 for hardware-outgoing; Fri, 19 Jul 1996 06:43:22 -0700 (PDT) Received: from shogun.tdktca.com ([206.26.1.21]) by freefall.freebsd.org (8.7.5/8.7.3) with ESMTP id GAA26416 for ; Fri, 19 Jul 1996 06:43:20 -0700 (PDT) Received: from shogun.tdktca.com (daemon@localhost) by shogun.tdktca.com (8.7.2/8.7.2) with ESMTP id IAA10912 for ; Fri, 19 Jul 1996 08:44:11 -0500 (CDT) Received: from fa.tdktca.com (bsd.fa.tdktca.com [163.49.131.129]) by shogun.tdktca.com (8.7.2/8.7.2) with ESMTP id IAA10905 for ; Fri, 19 Jul 1996 08:44:11 -0500 (CDT) Received: (from alex@localhost) by fa.tdktca.com (8.7.5/8.6.12) id IAA09527; Fri, 19 Jul 1996 08:48:38 -0500 (CDT) Date: Fri, 19 Jul 1996 08:48:38 -0500 (CDT) From: Alex Nash To: Bruce Evans cc: E00114@vnet.atea.be, freebsd-hardware@freebsd.org Subject: Re: Multiple COM ports with same IRQ In-Reply-To: <199607190247.MAA30281@godzilla.zeta.org.au> Message-ID: MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: owner-hardware@freebsd.org X-Loop: FreeBSD.org Precedence: bulk On Fri, 19 Jul 1996, Bruce Evans wrote: > >> ISA boxes can ^^^^^^^^^ > >> have hardware installed (accidentally?) with devices sharing the same IRQ, but > >> the drivers cannot deal with it. > > >The sharing of interrupts between ISA devices is an electrical > >constraint. When two devices are attempting to use a common IRQ line, > > That's why he only wanted to share them for EISA/ISA boxes :-). That's funny, I see ISA boxes mentioned above :) But maybe you can tell me how an EISA/ISA box solves the IRQ sharing problem for ISA devices. Alex