Date: Fri, 19 Jul 1996 16:31:20 -0500 (CDT) From: Alex Nash <alex@fa.tdktca.com> To: Brett Glass <Brett_Glass@ccgate.infoworld.com> Cc: bde@zeta.org.au, E00114@vnet.atea.be, freebsd-hardware@freebsd.org Subject: Re: Multiple COM ports with same IRQ Message-ID: <Pine.BSF.3.91.960719160603.7070X-100000@fa.tdktca.com> In-Reply-To: <9606198378.AA837808819@ccgate.infoworld.com>
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On Fri, 19 Jul 1996, Brett Glass wrote: > > maybe you can tell me how an EISA/ISA box solves the IRQ sharing problem > > for ISA devices. > > It doesn't. Of course not, it was rhetorical. > Only EISA devices or E-ISA devices can share IRQs. I think you misunderstand (and why wouldn't you now that you've removed the context of my message :). The original poster wrote: ISA boxes can have hardware installed (accidentally?) with devices sharing the same IRQ, but the drivers cannot deal with it. I responded with a spiel about IRQ sharing with an ISA bus being an electrical constraint, not a driver constraint. Bruce responded with... That's why he only wanted to share them for EISA/ISA boxes :-). Now help me out if I just don't get this, but the text I had quoted was about ISA, my followup was about ISA, and then I was corrected(?) because the original poster wanted to use EISA/ISA boxes (yet I was not discussing EISA at all). I didn't understand why it was relevant that the sharing was being done on an EISA/ISA box. Alex
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