From owner-freebsd-chat Thu May 3 11:25:58 2001 Delivered-To: freebsd-chat@freebsd.org Received: from lariat.org (lariat.org [12.23.109.2]) by hub.freebsd.org (Postfix) with ESMTP id C178737B422 for ; Thu, 3 May 2001 11:25:55 -0700 (PDT) (envelope-from brett@lariat.org) Received: from mustang.lariat.org (IDENT:ppp0.lariat.org@lariat.org [12.23.109.2]) by lariat.org (8.9.3/8.9.3) with ESMTP id MAA09888; Thu, 3 May 2001 12:24:33 -0600 (MDT) Message-Id: <4.3.2.7.2.20010503121741.045d38d0@localhost> X-Sender: brett@localhost X-Mailer: QUALCOMM Windows Eudora Version 4.3.2 Date: Thu, 03 May 2001 12:22:26 -0600 To: Terry Lambert From: Brett Glass Subject: Re: Modem Woes Cc: tlambert@primenet.com (Terry Lambert), dchulhan@uwi.tt (Dale Chulhan - Home), chat@FreeBSD.ORG (chat@FreeBSD.ORG) In-Reply-To: <200105031815.LAA29153@usr05.primenet.com> References: <4.3.2.7.2.20010503114324.0459d260@localhost> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Sender: owner-freebsd-chat@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.org 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