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Date:	Mon, 20 Mar 2006 10:04:11 PST8
From:	Tom Brown <thombrown@san.rr.com >
Reply-To:	scoug-help@scoug.com
To:	scoug-help@scoug.com
Subject:	SCOUG-Help: SCSI config question

Content Type: text/plain

Benedict G. Archer wrote:
> My all scsi system, two 1.2GHz Athlons on Tyan K7 MB which has two Adaptec 7899W SCSI adaptors, has worked very well for long time. One SCSI adaptor (channel B) controlls two IBM HDs at 160 Mbytes/s. The other (channel A) controls a Toshiba CD-ROM, Pextor CD writer and a Travan tape drive at 20 Mbytes/s (all internal devices). The ribbon cable from channel A also goes to an external 68 pin port that until now was unused, but am now trying to use for an Epson Perfection 636 scanner. But the scanner is not detected, and when it is connected boot-up is slow and the other devices on this adaptor sync at 5 or 10 Mbytes/s instead of 40. The scanner has two scsi connectors and a switch controlling an internal terminator. All conbinations fail. All IDs are different and legal. If I disconnect all the internal devices and connect only the scanner I get a "termination not found" error. This error occurrs whether the adaptor bios setting for internal adaptor termination is e
nabled or d
>
> Thanks, Ben

The Adaptec SCSI adapters are probably wide, while the scanner is a
narrow device. It does not terminate the high order lines on the SCSI
channel. When you use this type of arrangement, you need to have an
external cable that terminates the high order lines. I have purchased
these in the past from: http://www.cs-electronics.com They are not
cheap, but their products are very high quality. They do have a minimum
order value. They are also very knowledgeable, and can help you with
configuration questions.

HTH

--
Tom Brown, Catherder
thombrown at san dot rr dot com
Member SCOUG, V.O.I.C.E. & SDAA

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