Path: utzoo!attcan!uunet!cs.utexas.edu!tut.cis.ohio-state.edu!ucbvax!pro-generic.cts.com!swong
From: swong@pro-generic.cts.com (Stanley Wong)
Newsgroups: comp.sys.apple
Subject: Re: scsi on 3.5 seagate
Message-ID: <8906150216.AA00109@crash.cts.com>
Date: 14 Jun 89 16:15:27 GMT
Sender: daemon@ucbvax.BERKELEY.EDU
Reply-To: pnet01!pro-simasd!pro-generic!swong@nosc.mil
Organization: The Internet
Lines: 42

Network Comment: to #2402 by pnet01!crash!DOCKMASTER.NCSC.MIL!AELevy

> I note that I can connect a crate 60m (seagate) and a terminator to my
> gs apple scsi card, I can daisy chain a seagate 157n (in a la cie box)
> and everything works.  I cannot get the system to recognize the 3.5 157n
> by itself (tried with and without terminator).  Will 3.5 inch seagates
> not work with the apple scsi??  This is a little wierd and probably has
> something to do with the apple scsi card but I do not know (for example
> why do you have to terminate drives that work fine on the mac?)
>
> Does anyone know?
>
> Any ideas would be appreciated Thanks Allan

Well, I have a Mac Crate 60m hard drive on my IIgs.  When I first hooked it up
through my Apple II SCSI card, it wouldn't recognize it.  It knew there was a
SCSI card in the system, but couldn't find any devices.  I called CRATE and
they said that you can get a Terminator that would work from Quality Computers
and that would make the drive work.  I thought this was kind of awkward, since
the ST-277n was already terminated inside.  (underneath the drive).

Anyway, I talked to a friend who has had experience with the Crate drives, and
he told me that there *IS* a difference between pins 25 and 24 on a Mac SCSI
cable and II SCSI.  To make the 25 pin cable working, all I had to do was put
a jumper on the jumper pin just underneath the PC board inside the Crate. 
(The little board which divides the 50 pin cable into 2 25pin ports).

This switched the pins (according to him, and he said he got the info fromt he
SCSI Technical Ref manuals) and would allow me to use the Crate on the GS. 
Well, it worked.

I don't have any specs ont he LaCie, but I suspect that it uses a 25 pin
layout.  I don't know anything about the casing, so there might not be a
jumper pin.  However, If you open the drive, I am sure that you can pull the
50 pin ribbon coming from the Seagate mechanism out from the 25 pin port, and
connect it to at STANDARD 50 pin, terminate it (if necessary) and hook it up. 
I think this would be a possible solution.

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