Date: Sun, 3 Nov 1996 23:57:51 -0800 (PST) From: "Rodney W. Grimes" <rgrimes@GndRsh.aac.dev.com> To: smp@csn.net (Steve Passe) Cc: jkh@time.cdrom.com, hardware@freebsd.org Subject: Re: OK, what's the deal with 2940W controllers and internal connectors? Message-ID: <199611040757.XAA03248@GndRsh.aac.dev.com> In-Reply-To: <199611040423.VAA01364@clem.systemsix.com> from Steve Passe at "Nov 3, 96 09:23:13 pm"
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> 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
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