Date: Tue, 26 May 1998 20:35:05 -0700 (PDT) From: Doug White <dwhite@gdi.uoregon.edu> To: "Roger P. Johnson" <rpj@fep.hirshfields.com> Cc: freebsd-questions@FreeBSD.ORG Subject: Re: I got 2940UW timeout problem also ... help please ... Message-ID: <Pine.BSF.3.96.980526203204.13318Y-100000@gdi.uoregon.edu> In-Reply-To: <199805261855.NAA19152@fep.hirshfields.com>
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On Tue, 26 May 1998, Roger P. Johnson wrote: > In diagram terms, here is what I have: Bzzt! Wrong! Can't use both plugs simultaneously. Get a Wide-Narrow adapter and follow the instructions on http://www.adaptec.com/support/faqs/aha294x.html: Q: Can I use all three connectors on a AHA-2940UW? A: No. The internal 50 pin connector is a parallel branch of the lower 8 bits of the wide bus. Using all the connectors creates a "Y" connection instead of the point-to-point bus configuration required for proper operation. The wide bus on the AHA-2940UW can be pictured as two parallel horizontal lines, the upper eight data bits, and the lower eight data bits. The lower bus is tapped and routed to an internal 50 pin SCSI connector. If using an internal 68 pin hard drive at one end of the parallel lines, the other end of those lines must have a 68 pin terminated wide device on an external cable, an external non-wide device with an appropriate adapter to terminate the upper bus, be terminated on the host adapter(and have no other devices), OR have a non-wide device on the 50 pin internal connector with the host adapter termination set to high on/low off or Automatic. This maintains the point-to-point requirement of the SCSI bus. A complete list of part numbers, descriptions and configuration examples can be accessed via our Web site at: www.adaptec.com/cables/cable1.html#conv. Doug White | University of Oregon Internet: dwhite@resnet.uoregon.edu | Residence Networking Assistant http://gladstone.uoregon.edu/~dwhite | Computer Science Major To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-questions" in the body of the message
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