Date: Wed, 19 Jan 2000 00:43:35 -0600 From: Tim <tim@futuresouth.com> To: Mike Nowlin <mike@argos.org> Cc: Chip Marshall <chip@eboai.org>, freebsd-small <freebsd-small@FreeBSD.ORG> Subject: Re: PC/104 Message-ID: <20000119004334.D25200@futuresouth.com> In-Reply-To: <Pine.LNX.4.05.10001190127570.11030-100000@jason.argos.org> References: <20000114160203.A24225@futuresouth.com> <Pine.LNX.4.05.10001190127570.11030-100000@jason.argos.org>
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See appendix C of the PC/104 spec. on www.pc104.org. Also, you did not mention whether you are trying to share IRQs with devices on the same slot or across multiple slots. The former is fine. Tim On Wed, Jan 19, 2000 at 01:31:37AM -0500, Mike Nowlin wrote: > > > One additional difference is that PC/104 supports IRQ sharing (across > > different devices on the bus). I don't remember the details <mumbles > > something about impedance and pull-up/down> > > I've been kinda wondering about this for a while.... From everything I've > been able to find, it's not the ISA bus itself that causes problems with > sharing IRQ's, but it's the cheap cards we're so used to seeing everywhere > that don't use open-collector drivers. I have successfully shared > interrupts using old (bulky, lots of chips, sucks up lots of power) cards > in the past, but the modern stuff hates it. > > Any input? > > mike To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-small" in the body of the message
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