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Path: utzoo!watmath!clyde!floyd!harpo!ihnp4!fortune!jones
From: jones@fortune.UUCP
Newsgroups: net.micro.pc
Subject: Re: TEAC drives (AGAIN!!!) - (nf)
Message-ID: <2753@fortune.UUCP>
Date: Tue, 13-Mar-84 23:05:24 EST
Article-I.D.: fortune.2753
Posted: Tue Mar 13 23:05:24 1984
Date-Received: Wed, 14-Mar-84 19:54:36 EST
Sender: notes@fortune.UUCP
Organization: Fortune Systems, Redwood City, CA
Lines: 38

#R:rlgvax:-179000:fortune:14700006:000:1521
fortune!jones    Mar 13 19:40:00 1984

There are just a few points to remember when dealing with
daisy-chained peripherals:

    1.  Only one peripheral on each daisy-chain should have
	the terminating resistor pack installed.  All disk
	peripherals come from the vendor with a terminating
	pack in place because it is easier to throw the pack 
	away then to hunt one up.  The vendor normally tests
	each drive before shipment.

    2.	The termination resistor pack should be placed in
	the last 'physical' location on the daisy chain.
	That is the drive furthest from the controller.

    3.  Some people are blessed.  You can ignore the basics
	and your system may run just fine...perfectly in
	fact.  The reason is that sometimes you get more
	than you pay for.

It is a fact of manufacturing that it is expensive to build something
exactly to specification.  It is easier to make a part a little better
than required to minimize the testing and inspection.  Of course,
you can't make it too much better or it is uneconomic to produce.  So,
between those two bounds you get some systems which work even if you
stress them beyond specification and some that don't.  If you have 
more time than money, then give it a try.  It may work.  That is, of
course, if it doesn't damage anything.  If you have more money than
time, then take out the insurance of doing it the recommended way.

Dan Jones

UUCP:	{sri-unix,amd70,hpda,harpo,ihnp4,allegra}!fortune!jones
DDD:	(415)595-8444 x 440
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