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From: fair@ucbvax.ARPA (Erik E. Fair)
Newsgroups: net.micro.68k
Subject: Re: Altos 68000 - Random errors on HD1 - Fix
Message-ID: <10303@ucbvax.ARPA>
Date: Sun, 8-Sep-85 02:01:01 EDT
Article-I.D.: ucbvax.10303
Posted: Sun Sep  8 02:01:01 1985
Date-Received: Mon, 9-Sep-85 04:20:18 EDT
References: <235@investor.UUCP>
Organization: University of California at Berkeley
Lines: 20

The Quantum Q500 series of disks have an ST506/419 standard interface.
There may be up to four disks on a daisy chain. There should be exactly
one terminator (resistor pack) on any daisy chain, on the last disk in
the chain.

	computer |------+-------+-------+-------+
			D	D	D	D
			i	i	i	i
			s	s	s	s
			k	k	k	k
			0	1	2	3

In the above picture, the terminator pack should be on Disk3, and on NO
other. Note, however, that the disks may be in any order on the chain,
and the terminator must always be on the last disk in the chain. (one
other thing; in ST506, there is a cable per disk drive, in addition to
the daisy chained cable, which is not shown on the diagram above, since
it is not relevant to this discussion).

	Erik E. Fair	ucbvax!fair	fair@ucbarpa.BERKELEY.EDU