Newsgroups: comp.sys.amiga.tech
Path: utzoo!utgpu!watserv1!watdragon!spurge!ccplumb
From: ccplumb@spurge.uwaterloo.ca (Colin Plumb)
Subject: Re: SCSI line TPWR?
Message-ID: <1991Jan3.023856.20025@watdragon.waterloo.edu>
Sender: daemon@watdragon.waterloo.edu (Owner of Many System Processes)
Organization: University of Waterloo
References: <6630@crash.cts.com>
Date: Thu, 3 Jan 91 02:38:56 GMT
Lines: 15

In article <6630@crash.cts.com> hawk@pnet01.cts.com (John Anderson) writes:
>
>   Does anybody know what the external SCSI connector line 25 "TPWR" is
>supposed to connect to?  The other lines are esasy to figure what they connect
>to when going to a 50 pin connector, but line 25 has me stumped.  What does it
>connect to and what is it for.  Thanks for any help.

It sounds like terminator power (TERMPWR in the SCSI-1 and SCSI-2
standards).  I think it's pin 25, with 26 being the only even-numbered
line in a 50-pin connector that's not ground.  It's no connect, so you
won't short the terminator power to ground if you plug the connector in
backwards.  I may have even/odd mixed up, but it's the middle pair of
pins.
-- 
	-Colin