Path: utzoo!attcan!utgpu!jarvis.csri.toronto.edu!mailrus!cs.utexas.edu!uunet!zephyr.ens.tek.com!tektronix!psueea!parsely!agora!billsey
From: billsey@agora.UUCP (Bill Seymour)
Newsgroups: comp.sys.amiga
Subject: Re: Supra SCSI pinouts
Message-ID: <1687@agora.UUCP>
Date: 10 Nov 89 03:41:33 GMT
References: <127379@sun.Eng.Sun.COM
Organization: Advanced Solutions, Hillsboro, OR
Lines: 34

From article <127379@sun.Eng.Sun.COM, by admiral%m-5@Sun.COM (Michael Limprecht SUN Microsystems Mt. View Ca.):
 
: Does anybody out there have the  pinout for Supra A500
: scsi adapter. The thing is a DB37 connector and all my
: scsi devices are 50 pin.

	I don't have pinouts for you, but I believe a friend got them by
simply calling Supra and asking...


: The manual explains just enough to get you in trouble.
: Then shows you this diagram of the DB25 connector but
: not the DB37.
: 
: Why in the world would somone use a 37 pin layout when
: the rest of us are using 25 or 50 pin? Sounds like they
: don't want you using anything but there own devices.

	They originally designed it with a DB-25 in there, then found 
that they couldn't provide adequate power and grounding through the
limited wires on that cable. The DB-37 gave enough extra wires to
handle the power (needed for the RAM expansion) without significantly
increasing the cost to the end user. A 50 pin connector costs more
than a 37, and a 50 pin cable costs more (and is harder to bend) than
a 37...
 
: Just an observation. Thanks for the info in advance.
: 
: Mick
-- 
     -Bill Seymour             ...tektronix!reed!percival!agora!billsey
                               ...tektronix!sequent.UUCP!calvin!billsey
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