Re: SCSI termination (was: "Sun 3/60: SCSI Device List?")

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Article #6469

#6469

From: Craig Dewick
Date: Tue, 28 May 1996 00:00

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In <31A9A9D9.5185@vis.colostate.edu> Marcio Luis Teixeira <marciot@vis.colostate.edu> writes:

>> Beware: many Sun3/60 boards ground the TERMPWR SCSI line.  Do *not*
>> send terminator power to the bus -- it will be shorted to ground
>> (until something smokes).  Do not take terminator power from the bus
>> -- there is none.

>Makes you wonder what they had in mind when they did that. Some evil conspiracy to keep us from 
>using non-Sun hardware, perhaps? Hee, hee.

It was actually a design fault I believe. Boards that suffered from this
problem were 501-1205-09 or lower, and revision -01 of 501-1322, 501-1334
and 501-1345. Certain models of the original Seagate ST-225S 40 meg SCSI
hard drives (not sure if these were ever used by Sun) also had this
problem, causing a nice short on the +5 volt rail. 

Regards,

Craig.
-- 
             Craig Dewick. Send email to 'cdewick@jedi.apana.org.au'
                 The Core Matrix Foundation - Sydney, Australia
                        http://jedi.apana.org.au/core.html
 Always striving for a secure long-term future in an insecure short-term world

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<31A6543B.7861@vis.colostate.edu> <4o968m$13b@jedi.apana.org.au> <31A894FF.2A7C@vis.colostate.edu> <1996May27.023831.18518@jarvis.cs.toronto.edu> <31A9A9D9.5185@vis.colostate.edu>

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From: cdewick@jedi.apana.org.au (Craig Dewick)
Subject: Re: SCSI termination (was: "Sun 3/60: SCSI Device List?")
Date: 1996/05/28
Message-ID: <4odpvj$578@jedi.apana.org.au>
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