From owner-freebsd-questions Tue Apr 16 22:14:53 1996 Return-Path: owner-questions Received: (from root@localhost) by freefall.freebsd.org (8.7.3/8.7.3) id WAA08242 for questions-outgoing; Tue, 16 Apr 1996 22:14:53 -0700 (PDT) Received: from mail.barrnet.net (mail.barrnet.net [131.119.246.7]) by freefall.freebsd.org (8.7.3/8.7.3) with ESMTP id WAA08237 for ; Tue, 16 Apr 1996 22:14:51 -0700 (PDT) Received: from genesis.atrad.adelaide.edu.au (genesis.atrad.adelaide.edu.au [129.127.96.120]) by mail.barrnet.net (8.7.5/MAIL-RELAY-LEN) with ESMTP id TAA15560 for ; Tue, 16 Apr 1996 19:14:02 -0700 (PDT) Received: from msmith@localhost by genesis.atrad.adelaide.edu.au (8.6.12/8.6.9) id LAA05021; Wed, 17 Apr 1996 11:33:36 +0930 From: Michael Smith Message-Id: <199604170203.LAA05021@genesis.atrad.adelaide.edu.au> Subject: Re: adaptec 1522 support To: jlwest@tseinc.com (Jay L. West) Date: Wed, 17 Apr 1996 11:33:36 +0930 (CST) Cc: freebsd-questions@freebsd.org In-Reply-To: <199604161313.IAA02239@bsd.tseinc.com> from "Jay L. West" at Apr 16, 96 08:13:34 am MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Sender: owner-questions@freebsd.org X-Loop: FreeBSD.org Precedence: bulk Jay L. West stands accused of saying: > > I'm using an adaptec aha-1522a controller for a 4mm tape backup (disks are > ide). I noticed in the 'controller aic....' that no dma channel is > specified, thus I suspect the controller is 'throughput challenged'. I then > saw the handbook mentions that controller with the text '(SLOW!)' appended > . > > Backup speed isn't that important on this system but I don't know what they > mean by 'slow'. Does anyone have comparative info say between a 1522 and > 1542? Is it slow in relative terms or 'brutally unusably slow' ? "slow" in that it's a 16-bit PIO interface. A DAT will max out at several hundred K/sec, so it's not going to challenge such a controller, but putting a disk on it would be a Bad Idea. > Jay West -- ]] Mike Smith, Software Engineer msmith@atrad.adelaide.edu.au [[ ]] Genesis Software genesis@atrad.adelaide.edu.au [[ ]] High-speed data acquisition and (GSM mobile) 0411-222-496 [[ ]] realtime instrument control (ph/fax) +61-8-267-3039 [[ ]] Collector of old Unix hardware. "Where are your PEZ?" The Tick [[