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Path: euryale.cc.adfa.oz.au!newshost.carno.net.au!harbinger.cc.monash.edu.au!munnari.OZ.AU!news.mel.connect.com.au!news.mira.net.au!vic.news.telstra.net!act.news.telstra.net!psgrain!charnel.ecst.csuchico.edu!newshub.csu.net!csulb.edu!news.uoregon.edu!enews.sgi.com!news.mathworks.com!nntp.primenet.com!howland.erols.net!surfnet.nl!newsfeed.sunet.se!news01.sunet.se!sunic!02-newsfeed.univie.ac.at!01-newsfeed.univie.ac.at!swidir.switch.ch!in2p3.fr!univ-lyon1.fr!jussieu.fr!eurocontrol.fr!polaris.eurocontrol.fr!n ot-for-mail From: Ollivier.Robert@eurocontrol.fr (Ollivier Robert) Newsgroups: comp.unix.bsd.freebsd.misc Subject: Re: SCSI card Date: 4 Sep 1996 15:29:58 GMT Organization: Eurocontrol EEC, Bretigny, France Lines: 32 Message-ID: <50k79m$l9t@polaris.eurocontrol.fr> References: <Pine.SOL.3.93.960903215141.13825B-100000@bmec.hscbklyn.edu> NNTP-Posting-Host: mozart.eurocontrol.fr [courtesy cc of this posting sent to cited author via email] In article <Pine.SOL.3.93.960903215141.13825B-100000@bmec.hscbklyn.edu>, David Zakai <zakaid99@hscbklyn.edu> wrote: > I intend to get a Pentium 166 MHz PCI computer with an EIDE > hard disk, because the card/drive combination is much cheaper, First, do yourself a favor. Buy a P133 (instead of 166) but do get a SCSI-only system. You'll have one card for all peripherals, without fuss, it'll work. Period. > 1. Are there still significant incompatibilities when using > a PCI-based card (like Adaptec AHA-2940 or AHA-2920) instead > of ISA-based cards like Adaptec AVA-1522B ? The SCSI driver supports non-DMA controllers like 152x but is slower. > 2. Is the performance boost significant for PCI versus ISA cards > (when PCI are double the cost) ? Yes, ISA bus is limited in bandwidth at more or less 4-5 MB/s where you can get more with a PCI card. > 3. Is there a significant performance boost when using > bus mastering versus PIO (programmed IO) Adaptec cards? It is more in term of CPU use. Bus-master adapters use much less CPU so you can get more things done in the same time. -- Ollivier ROBERT -=- Eurocontrol EEC/TIS -=- Ollivier.Robert@eurocontrol.fr FreeBSD FAQ: <URL:http://www.FreeBSD.org/FAQ/>