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From: wunder@wdl1.UUCP
Newsgroups: net.arch
Subject: Re: Definitions of SASI/SCSI?
Message-ID: <297@wdl1.UUCP>
Date: Mon, 25-Feb-85 00:02:08 EST
Article-I.D.: wdl1.297
Posted: Mon Feb 25 00:02:08 1985
Date-Received: Wed, 27-Feb-85 09:32:43 EST
Sender: notes@wdl1.UUCP
Organization: Ford Aerospace, Western Development Laboratories
Lines: 22
Nf-ID: #R:ecsvax:-75200:wdl1:2100003:000:805
Nf-From: wdl1!wunder    Feb 24 18:27:00 1985

Computer to Controller Interfaces

SASI	Shugart Associates System Interface, an easy to implement
	   interface to a tape or disc controller.
	   Pronounced "sassy".
SCSI	Small Computer Systems Interface, ANSI version of SASI.
	   Compatible, with some new, fancy commands added.
	   Pronounced "scuzzy".  1.5 Mbytes/sec, new options allow
	   4 Mbytes/sec (syncronous transfers).
IPI	Intelligent Peripheral Interface.  New standard with more
	   smarts in the controller.

Controller to Disc Interfaces

ST-506	Shugart controller to disc interface.  Very widely used.
	   5 Mbits/sec.
ESDI	Enhanced Small Disk Interface.  New standard for faster
	   disks.  15 Mbits/sec.
SMD	Storage Module Drive, the old favorite.  Originally 10Mbits/sec
	   (is that right?), new controllers handle 24 Mbits/sec.