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From: neese@adaptx1.UUCP
Newsgroups: comp.periphs.scsi
Subject: Re: <396@oiscola.Columbia.NCR.COM>
Message-ID: <283400135@adaptx1>
Date: 11 Jun 91 02:37:38 GMT
References: <396@oiscola.Columbia.NCR.COM>
Lines: 21
Nf-ID: #R:oiscola.Columbia.NCR.COM:396:adaptx1:283400135:000:996
Nf-From: adaptx1.UUCP!neese    Jun 10 10:37:00 1991


>I have both an Adaptec 1540B and a DPT PM2001/95.  I now use the DPT 
>board only.  I have it connected to a Conner CP3200F, 200 Mb SCSI-2 
>drive.  In comparing the Adaptec to the DPT, I had some interesting 
>results.  According to Core tests, for what they're worth, the DPT 
>delivered faster seek times (18.1 msec for the DPT vs. 19.2 for the 
>Adaptec).  I attribute this to the fact that the DPT uses a faster 
>processor (MC68000, 10 MHz) and is a full 16-bit board meaning that all 
>data paths are 16 bit.  This is not (I believe) the case for the 1540B - 
>it uses and 8 bit processor.
>STUFF DELETED<

The 154x is a full blown 16 bit adapter with a full blown 16 bit data path.
The on board CPU is for local transactions only and has nothing to do with
the actual data transfer.  This is handled by the DMA chip and sequencer
on the adapter board.

			Roy Neese
			Adaptec Senior SCSI Applications Engineer
			UUCP @  neese@adaptex
				uunet!cs.utexas.edu!utacfd!merch!adaptex!neese