From owner-freebsd-hardware Sun Nov 3 23:58:23 1996 Return-Path: owner-hardware Received: (from root@localhost) by freefall.freebsd.org (8.7.5/8.7.3) id XAA04617 for hardware-outgoing; Sun, 3 Nov 1996 23:58:23 -0800 (PST) Received: from GndRsh.aac.dev.com (GndRsh.aac.dev.com [198.145.92.241]) by freefall.freebsd.org (8.7.5/8.7.3) with ESMTP id XAA04598 for ; Sun, 3 Nov 1996 23:58:18 -0800 (PST) Received: (from rgrimes@localhost) by GndRsh.aac.dev.com (8.7.5/8.7.3) id XAA03248; Sun, 3 Nov 1996 23:57:52 -0800 (PST) From: "Rodney W. Grimes" Message-Id: <199611040757.XAA03248@GndRsh.aac.dev.com> Subject: Re: OK, what's the deal with 2940W controllers and internal connectors? In-Reply-To: <199611040423.VAA01364@clem.systemsix.com> from Steve Passe at "Nov 3, 96 09:23:13 pm" To: smp@csn.net (Steve Passe) Date: Sun, 3 Nov 1996 23:57:51 -0800 (PST) Cc: jkh@time.cdrom.com, hardware@freebsd.org X-Mailer: ELM [version 2.4ME+ PL25 (25)] MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Sender: owner-hardware@freebsd.org X-Loop: FreeBSD.org Precedence: bulk > Hi, > > >use. While reading the Adaptec controller docs before jumping in, I > >saw that it very specifically said to use only ONE of the internal > >connectors, either the WIDE or the narrow, but not both. You could > >still use the external connector for either kind of drive, but not > >hook both internal connectors up at once. Well, this made sense to me > >since it seemed like otherwise you'd have a "Y" configuration in your > >SCSI bus, and it wasn't clear which devices you'd terminate if you > >plugged both internal connectors in - each end of the Y, or what? So > > use any 2 of the 3, both internal is fine as long as you don't use the > external. As to termination, the card is at the end if using > 1 cable (and thus should be terminated) and is in the middle if using > 2 cables (any commbination) and should NOT be terminated. VERY common mistake here, if using 2 cables, and BOTH are wide, no termination is needed on the 2940*W, if using 2 cables and one is narrow the 2940*W MUST terminate the high 8 bits of the scsi bus (HIGH ON/LOW OFF) is what Adaptec calls it. -- Rod Grimes rgrimes@gndrsh.aac.dev.com Accurate Automation, Inc. Reliable computers for FreeBSD