Date: Tue, 20 Aug 1996 21:52:20 -0700 (PDT) From: "Rodney W. Grimes" <rgrimes@GndRsh.aac.dev.com> 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: <199608210452.VAA09048@GndRsh.aac.dev.com> In-Reply-To: <9608210204.AA12263@stargazer> from "gary.corcoran" at "Aug 20, 96 10:04:20 pm"
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> > >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. The above statement is incorrect, the connection of INTx signals between slots is implementation specific. > 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? It is one of several allowed implementations in the PCI spec, it is also one of the better implementations. > I was under the impression that at least _some_ MBs shared > their PCI interrupts...? That is correct, some of them bus these signals between cards, more common in the early PCI 1.0 compliant boards, rare today in the 2.1 compliant boards, but still allowed. -- Rod Grimes rgrimes@gndrsh.aac.dev.com Accurate Automation Company Reliable computers for FreeBSD
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