From owner-freebsd-hackers Tue Aug 25 18:43:30 1998 Return-Path: Received: (from majordom@localhost) by hub.freebsd.org (8.8.8/8.8.8) id SAA18988 for freebsd-hackers-outgoing; Tue, 25 Aug 1998 18:43:30 -0700 (PDT) (envelope-from owner-freebsd-hackers@FreeBSD.ORG) Received: from smtp04.primenet.com (smtp04.primenet.com [206.165.6.134]) by hub.freebsd.org (8.8.8/8.8.8) with ESMTP id SAA18960 for ; Tue, 25 Aug 1998 18:43:25 -0700 (PDT) (envelope-from tlambert@usr04.primenet.com) Received: (from daemon@localhost) by smtp04.primenet.com (8.8.8/8.8.8) id SAA26096; Tue, 25 Aug 1998 18:42:37 -0700 (MST) Received: from usr04.primenet.com(206.165.6.204) via SMTP by smtp04.primenet.com, id smtpd026076; Tue Aug 25 18:42:32 1998 Received: (from tlambert@localhost) by usr04.primenet.com (8.8.5/8.8.5) id SAA00101; Tue, 25 Aug 1998 18:42:29 -0700 (MST) From: Terry Lambert Message-Id: <199808260142.SAA00101@usr04.primenet.com> Subject: Re: Adaptec 1542i Performance on -stable [was Re: SCSI Controller] To: wilko@yedi.iaf.nl (Wilko Bulte) Date: Wed, 26 Aug 1998 01:42:28 +0000 (GMT) Cc: joelh@gnu.org, dakott@alpha.delta.edu, hackers@FreeBSD.ORG In-Reply-To: <199808252104.XAA01621@yedi.iaf.nl> from "Wilko Bulte" at Aug 25, 98 11:04:40 pm X-Mailer: ELM [version 2.4 PL25] MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Sender: owner-freebsd-hackers@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.ORG > > Many 1542s (particularly the B series) were very sensitive to poor > > cabling and termination problems. > > I think there were also cabling sensitivities in the C series(?). Specifically, if you have a "B", and you enable the external SCSI connector, you are required to attach an external SCSI terminator. This goes for the 1742B, as well. For the "C", you can look at the SCSI connector; if there is not a pull-up resistor soldered in as an obvious ECN afterthought, then you must use an external terminator as well, AND you will be unable to use both the internal and external connectors for devices, simultaneously. The "C" rev also broke "target mode" support; the controller will support it, but it must have the pull-up, and the default ROMs claim it is unsupported. Terry Lambert terry@lambert.org --- Any opinions in this posting are my own and not those of my present or previous employers. To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message