Path: utzoo!attcan!utgpu!jarvis.csri.toronto.edu!mailrus!ames!haven!grebyn!ckp
From: ckp@grebyn.com (Checkpoint Technologies)
Newsgroups: comp.sys.amiga
Subject: Re: ESDI controllers?
Message-ID: <12230@grebyn.com>
Date: 20 Jul 89 15:34:32 GMT
References: <640@lpami.wimsey.bc.ca>
Reply-To: ckp@grebyn.UUCP (Checkpoint Technologies)
Organization: Grebyn Corp., Vienna, VA, USA
Lines: 24

In article <640@lpami.wimsey.bc.ca> lphillips@lpami.wimsey.bc.ca (Larry Phillips) writes:
>
>controller interface, ie.  SCSI is _NOT_ a controller to drive interface.  The
>speed you obtain will depend entirely on the maximum speed of the slowest link
>in the chain, whether it's the OS, the host adapter, the controller, or the
>drive, and this is true no matter where the controller physically resides.
>
	No argument, that's exactly correct. ESDI and SCSI are not
necessarily exclusive. If you're using a SCSI interface to an EDSI
controller and drive, you'll get ESDI performance. If however you're
using one of the newer embedded-SCSI drives, you can get better
performance than that. If your ESDI controller were in a Zorro plug-in 
card (if one were available), then that possibility is not present.

	The Amiga bus is limited to about 3.6 Megabytes per second
bandwidth. ESDI's transfer rate is 15 megabits, which is about 1.88
megabytes per second. I've heard of 24 megabit per second (3 megabyte
per second) SCSI. That sounds to me like SCSI provides the capability
for higher performance. 
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