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Path: sserve!newshost.anu.edu.au!harbinger.cc.monash.edu.au!msuinfo!agate!howland.reston.ans.net!EU.net!sunic!ugle.unit.no!ravn.runit.sintef.no!he From: Havard.Eidnes@runit.sintef.no (Havard Eidnes) Newsgroups: comp.os.386bsd.questions Subject: Re: SCSI and NetBSD PRoblems Date: 24 Sep 1994 10:42:16 GMT Organization: SINTEF RUNIT, Trondheim, Norway Lines: 19 Distribution: inet Message-ID: <360vq8$kdo@ugle.unit.no> References: <357404$nb0@hermes.unt.edu> <MICHAELV.94Sep14135750@MindBender.HeadCandy.com> <357ka5$123@hermes.unt.edu> <MICHAELV.94Sep15000641@mindbender.headcandy.com> NNTP-Posting-Host: ravn.runit.sintef.no Originator: he@ravn.runit.sintef.no In article <MICHAELV.94Sep15000641@mindbender.headcandy.com>, Michael L. VanLoon <michaelv@MindBender.HeadCandy.com> wrote: > >NetBSD doesn't support more than 16MB of RAM with an *ISA*-bus SCSI >controller. Slight correction: NetBSD doesn't support more than 16MB of RAM with a ISA-bus *DMA-based* SCSI controller. For one, I don't think the AHA-152x controllers (can) do DMA. On the other hand, from a performance perspective recommending AHA-152x probably isn't such a great idea, and there are other reasons for not buying Adaptec cards (mentioned here earlier). The wd disk driver (for IDE drives) also does programmed IO and not DMA, and I understand that's the reason this driver works just fine in a ISA-based system with more than 16MB RAM. The same thing about performance probably applies here as well, though... - Havard