From owner-freebsd-hackers Wed Aug 26 13:31:32 1998 Return-Path: Received: (from majordom@localhost) by hub.freebsd.org (8.8.8/8.8.8) id NAA10374 for freebsd-hackers-outgoing; Wed, 26 Aug 1998 13:31:32 -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 NAA10368 for ; Wed, 26 Aug 1998 13:31:30 -0700 (PDT) (envelope-from tlambert@usr02.primenet.com) Received: (from daemon@localhost) by smtp04.primenet.com (8.8.8/8.8.8) id NAA06344; Wed, 26 Aug 1998 13:30:39 -0700 (MST) Received: from usr02.primenet.com(206.165.6.202) via SMTP by smtp04.primenet.com, id smtpd006226; Wed Aug 26 13:30:32 1998 Received: (from tlambert@localhost) by usr02.primenet.com (8.8.5/8.8.5) id NAA20478; Wed, 26 Aug 1998 13:30:24 -0700 (MST) From: Terry Lambert Message-Id: <199808262030.NAA20478@usr02.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 20:30:24 +0000 (GMT) Cc: tlambert@primenet.com, joelh@gnu.org, dakott@alpha.delta.edu, hackers@FreeBSD.ORG In-Reply-To: <199808260918.LAA07176@yedi.iaf.nl> from "Wilko Bulte" at Aug 26, 98 11:18:19 am 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 > > This goes for the 1742B, as well. > > There is no 1742B. Only a 174x and 174xA (x =[02] for (no)floppy interface). > > The 174x are all sensitive to using both internal and external cabling > at the same time. For our Alphaservers we simply made that an unsupported > config. In addition 174x are sensitive to which disks you use, some > simply don't work, primarily the newer/faster ones. I'm pretty sure that the 1742 controller in my machine with the 50MHz 486DX (*NOT* DX2), and on which I clock my EISA bus at 50MHz because the 1742B could handle it, where the 1742A could not, is a 1742B. I remember getting it at the time becayse it out performed a Pentium 66 clock doubled from 33 MHz because of the aditional 17MHz of memory and I/O bus speed; that, and Intel and AMD had both promised clock doubled DX2/100 *NOT* DX4/100) chips that would use the 50MHz bus in this ASUS motherboard. I'm also pretty sure the "B" comes from the EISA configuration capability that I had to read the serial number to the Adaptec people so they could tell me if the card supported it, whereby I was able to configure a non-standard translation mode to support larger drives than would otherwise be possible on a 1742/1742A. 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