Date: Thu, 03 May 2001 12:17:25 -0600 From: Brett Glass <brett@lariat.org> To: Mark Murray <mark@grondar.za> Cc: chat@FreeBSD.ORG (chat@FreeBSD.ORG) Subject: Re: Modem Woes Message-ID: <4.3.2.7.2.20010503121434.045cac30@localhost> In-Reply-To: <200105031803.f43I3Gp71344@gratis.grondar.za> References: <4.3.2.7.2.20010503114324.0459d260@localhost> <brett@lariat.org> <4.3.2.7.2.20010503114324.0459d260@localhost>
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At 12:05 PM 5/3/2001, Mark Murray wrote: >These are mutiport cards, and they can share interrupts _only_ >because they have the hardware to do it. This hardware is NOT usual >on a "normal" COMport. Actually, these ARE ordinary ports. They use exactly the same UARTs as others. The only difference is that, if they are ISA cards, the IRQ lines are "ORed" before they leave the card so that there isn't a "tug of war" between two tri-state drivers on an ISA IRQ line. PCI cards can share IRQs, so it's not an issue with PCI. --Brett To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-chat" in the body of the message
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