Path: utzoo!attcan!uunet!snorkelwacker!usc!jarthur!rspangle
From: rspangle@jarthur.Claremont.EDU (Randy Spangler)
Newsgroups: comp.sys.ibm.pc
Subject: Re: ESDI or SCSI or RLL?
Message-ID: <6137@jarthur.Claremont.EDU>
Date: 12 Apr 90 15:53:51 GMT
References: <18758@boulder.Colorado.EDU> <27800006@adaptex>
Organization: Harvey Mudd College, Claremont, CA 91711
Lines: 18

In article <27800006@adaptex> neese@adaptex.UUCP writes:
>  The 152x adapter is a PIO (Programmed I/O) 16 bit SCSI Host Adapter.  The
>154x is a bus master 16 Bit host adapter.  That is the basic architecture
>difference.  The 152x card is being merketed primarily as a DOS adapter.

Now, my only question is "What's the difference, hardware-wise and 
functionality-wise, between the PIO and bus master?"

Oh, and while I'm at it, does anyone know of any 32-bit drive cards?  It 
seems this would be the way to go with the 386/486/etc computers which can
handle 32-bit data paths.  Would such a card actually give you a 2x speed
increase, or is there another bottleneck?  (Assume a 386 running at 25MHz)

-- 
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|    Randy Spangler                    |    The less things change, the    |
|    rspangle@jarthur.claremont.edu    |    more they remain the same      |
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