Date: Wed, 17 Apr 1996 11:33:36 +0930 (CST) From: Michael Smith <msmith@atrad.adelaide.edu.au> To: jlwest@tseinc.com (Jay L. West) Cc: freebsd-questions@freebsd.org Subject: Re: adaptec 1522 support Message-ID: <199604170203.LAA05021@genesis.atrad.adelaide.edu.au> In-Reply-To: <199604161313.IAA02239@bsd.tseinc.com> from "Jay L. West" at Apr 16, 96 08:13:34 am
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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 > <grin>. > > 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' <grin>? "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 [[
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