Date: Thu, 03 May 2001 12:22:26 -0600 From: Brett Glass <brett@lariat.org> To: Terry Lambert <tlambert@primenet.com> Cc: tlambert@primenet.com (Terry Lambert), dchulhan@uwi.tt (Dale Chulhan - Home), chat@FreeBSD.ORG (chat@FreeBSD.ORG) Subject: Re: Modem Woes Message-ID: <4.3.2.7.2.20010503121741.045d38d0@localhost> In-Reply-To: <200105031815.LAA29153@usr05.primenet.com> References: <4.3.2.7.2.20010503114324.0459d260@localhost>
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At 12:15 PM 5/3/2001, Terry Lambert wrote: >Brett, these are multiport cards, which have interrupt coelescing >logic on the multiport card, There isn't any fancy logic.... It's just a "wired OR," since the UART chips have open collector IRQ outputs. >PC motherboards can not share ISA interrupts, period, It is true that two separate ISA cards can't share IRQs. However, many motherboard chipsets are now designed so that a UART on the motherboard can share an IRQ with an ISA card successfully. The motherboard chip makers have done this to forestall endless complaints from users. >It is highly probable that we are talking about an IRQ conflict, >given that he _already stated_ that he was plugging a modem in, >_AND_ that Windows rec0ognized it as COM4 without being beat over >the head with a 2x4 or having a new driver loaded. Windows assigns "COMx" port numbers without regard to I/O port address or IRQ number. While it says "COM4:", you may discover that the board uses, say, IRQ 11 and I/O base address 300. --Brett To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-chat" in the body of the message
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