From owner-freebsd-hardware Sun Apr 19 22:50:59 1998 Return-Path: Received: (from majordom@localhost) by hub.freebsd.org (8.8.8/8.8.8) id WAA07043 for freebsd-hardware-outgoing; Sun, 19 Apr 1998 22:50:59 -0700 (PDT) (envelope-from owner-freebsd-hardware@FreeBSD.ORG) Received: from narnia.plutotech.com (narnia.plutotech.com [206.168.67.130]) by hub.freebsd.org (8.8.8/8.8.8) with ESMTP id FAA07014 for ; Mon, 20 Apr 1998 05:50:48 GMT (envelope-from gibbs@narnia.plutotech.com) Received: (from gibbs@localhost) by narnia.plutotech.com (8.8.8/8.7.3) id XAA12945; Sun, 19 Apr 1998 23:46:55 -0600 (MDT) Date: Sun, 19 Apr 1998 23:46:55 -0600 (MDT) From: "Justin T. Gibbs" Message-Id: <199804200546.XAA12945@narnia.plutotech.com> To: David Kelly cc: hardware@FreeBSD.ORG Subject: Re: Narrow SCSI controllers, and using WIDE drives with them Newsgroups: pluto.freebsd.hardware In-Reply-To: <199804200355.WAA00526@nospam.hiwaay.net> User-Agent: tin/pre-1.4-971204 (UNIX) (FreeBSD/3.0-CURRENT (i386)) Sender: owner-freebsd-hardware@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.org In article <199804200355.WAA00526@nospam.hiwaay.net> you wrote: > Stephen Hocking-Senior Programmer PGS Tensor Perth writes: >> >> Is it possible, and if you have one of those 50 pin flat ribbon cables, is it >> >> possible to buy adaptors for those D-plug style connectors? > > Yes, it is possible to buy adapters. No, it won't work. As a general > rule wide HD's will not fall back to a narrow connection. Wide > controllers are forced to fall back and handle narrow devices as a > special case. You should really read the SCSI spec. All transfers are narrow unless a properly negotiated wide connection is established between target and initiator. On many IBM devices there is a jumper that prevents the device from initiating wide negotiation, but this has no effect on the device's ability to handle 8 bit transfers should a negotiation attempt fail. -- Justin To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hardware" in the body of the message