*BSD News Article 21590


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From: adam@veda.is (Adam David)
Newsgroups: comp.os.386bsd.questions,comp.periphs.scsi
Subject: Re: CDs and SCSI
Message-ID: <CE2AF7.AA@veda.is>
Date: 28 Sep 93 11:25:40 GMT
References: <CE29yI.IKt@festival.ed.ac.uk>
Organization: Veda Systems, Iceland
Lines: 15

richard@castle.ed.ac.uk (Richard Tobin) writes:

>There seem to be numerous CD rom drives on sale that are sold with
>SCSI adaptors much cheaper than the adaptors supported by BSD (Adaptec
>etc).  What is the difference between these adaptors and the supported
>ones?  Obviously they may require different drivers, but are the
>adaptors themselves inherently less capable?

You might find that they are not DMA busmasters, so you could end up using
more CPU cycles pushing all that data around. You might also find them slower
for this or any other number of reasons. Wasn't someone working on an ST-02
driver?

--
adam@veda.is