Date: Wed, 21 Aug 1996 11:52:28 +0930 (CST) From: Michael Smith <msmith@atrad.adelaide.edu.au> To: gtc@aloft.att.com (gary.corcoran) Cc: msmith@atrad.adelaide.edu.au, freebsd-hardware@FreeBSD.org Subject: Re: ASUS SC200 SCSI card? (PCI interrupts) Message-ID: <199608210222.LAA08586@genesis.atrad.adelaide.edu.au> In-Reply-To: <9608210204.AA12263@stargazer> from "gary.corcoran" at Aug 20, 96 10:04:20 pm
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gary.corcoran stands accused of saying: > > >PCI interrupts are lettered (INTA, INTB, INTC, INTD), not numbered, and > >that INTA on one slot is _NOT_ connected to INTA on any other slot. > > Is the non-connection between same-letter PCI interrupts in different > slots only on good (versatile) motherboards, or is that part of the > PCI spec? I was under the impression that at least _some_ MBs shared > their PCI interrupts...? The normal convention with PC motherboards is that devices will normally only generate INTA, and that INTA on each slot is routed seperately. Beyond this, I'm not so sure. I believe that other interrupts can be used by PCI-PCI bridge chips, but I'm not clear on that. Certainly there have been some motherboards where INTA was bridged across several slots; these all fall into the 'very broken' category. > Gary -- ]] Mike Smith, Software Engineer msmith@atrad.adelaide.edu.au [[ ]] Genesis Software genesis@atrad.adelaide.edu.au [[ ]] High-speed data acquisition and (GSM mobile) 0411-222-496 [[ ]] realtime instrument control (ph/fax) +61-8-267-3039 [[ ]] Collector of old Unix hardware. "Where are your PEZ?" The Tick [[
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