Xref: utzoo comp.sys.mac.hardware:7734 comp.sys.mac.misc:7265
Path: utzoo!utgpu!cunews!mitel!testeng1!stanfiel
From: stanfiel@testeng1.misemi (Chris Stanfield)
Newsgroups: comp.sys.mac.hardware,comp.sys.mac.misc
Subject: Re: Question on Removable HD
Message-ID: <5901@testeng1.misemi>
Date: 4 Jan 91 14:10:04 GMT
References: <1990Dec31.181853.28607@bronze.ucs.indiana.edu> <1991Jan2.215035.17901@uokmax.ecn.uoknor.edu> <1991Jan2.232147.4576@agate.berkeley.edu> <962@chem.ucsd.EDU>
Reply-To: stanfiel@testeng1.UUCP ()
Organization: Mitel CAE Services
Lines: 14

In article <962@chem.ucsd.EDU> rich@sdchemf (Richard Kanner) writes:
> I asked APS about this and they said that the SCSI terminator
>on the SyQuest needed to be powered up inorder to work.

This is true of all SCSI terminators. The SCSI spec. includes a signal
called TERMPWR. This signal can be supplied by the host or the device.
There are diodes used to prevent reverse power feed. Unfortunately,
Apple, for some reason, omit this signal from their (non-standard)
SCSI connector. I'm not sure why this is, because there is a spare pin
on the connector (P25). 

Chris Stanfield, Mitel Corporation: E-mail to:- uunet!mitel!testeng1!stanfiel
(613) 592 2122 Ext.4960
We do not inherit the world from our parents - we borrow it from our children.